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## org.apache.commons.digester3
Class Digester

    java.lang.Object
      org.xml.sax.helpers.DefaultHandler
          org.apache.commons.digester3.Digester

All Implemented Interfaces:
  ContentHandler, DTDHandler, EntityResolver, ErrorHandler

    public class Digester

extends DefaultHandler

A Digester processes an XML input stream by matching a series of element nesting patterns to execute Rules that have been added prior to the start of parsing.

See the Digester Developer Guide for more information.

IMPLEMENTATION NOTE - A single Digester instance may only be used within the context of a single thread at a time, and a call to `parse()` must be completed before another can be initiated even from the same thread.

A Digester instance should not be used for parsing more than one input document. The problem is that the Digester class has quite a few member variables whose values "evolve" as SAX events are received during a parse. When reusing the Digester instance, all these members must be reset back to their initial states before the second parse begins. The "clear()" method makes a stab at resetting these, but it is actually rather a difficult problem. If you are determined to reuse Digester instances, then at the least you should call the clear() method before each parse, and must call it if the Digester parse terminates due to an exception during a parse.

LEGACY IMPLEMENTATION NOTE - When using the legacy XML schema support (instead of using the `Schema` class), a bug in Xerces 2.0.2 prevents the support of XML schema. You need Xerces 2.1/2.3 and up to make this class work with the legacy XML schema support.

This package was inspired by the `XmlMapper` class that was part of Tomcat 3.0 and 3.1, but is organized somewhat differently.

Field Summary
`protected List<InputSource>` | `inputSources` `List` of `InputSource` instances created by a `createInputSourceFromURL()` method call.
`protected static String` | `W3C_XML_SCHEMA` The schema language supported.

Constructor Summary
`Digester()` Construct a new Digester with default properties.
`Digester(SAXParser parser)` Construct a new Digester, allowing a SAXParser to be passed in.
`Digester(XMLReader reader)` Construct a new Digester, allowing an XMLReader to be passed in.

Method Summary
`void` | `addBeanPropertySetter(String pattern)` Add a "bean property setter" rule for the specified parameters.
`void` | `addBeanPropertySetter(String pattern, String propertyName)` Add a "bean property setter" rule for the specified parameters.
`void` | `addCallMethod(String pattern, String methodName)` Add an "call method" rule for a method which accepts no arguments.
`void` | `addCallMethod(String pattern, String methodName, int paramCount)` Add an "call method" rule for the specified parameters.
`void` | `addCallMethod(String pattern, String methodName, int paramCount, Class<?>[] paramTypes)` Add an "call method" rule for the specified parameters.
`void` | `addCallMethod(String pattern, String methodName, int paramCount, String[] paramTypes)` Add an "call method" rule for the specified parameters.
`void` | `addCallParam(String pattern, int paramIndex)` Add a "call parameter" rule for the specified parameters.
`void` | `addCallParam(String pattern, int paramIndex, boolean fromStack)` Add a "call parameter" rule.
`void` | `addCallParam(String pattern, int paramIndex, int stackIndex)` Add a "call parameter" rule that sets a parameter from the stack.
`void` | `addCallParam(String pattern, int paramIndex, String attributeName)` Add a "call parameter" rule for the specified parameters.
`void` | `addCallParamPath(String pattern, int paramIndex)` Add a "call parameter" rule that sets a parameter from the current `Digester` matching path.
`void` | `addFactoryCreate(String pattern, Class<? extends ObjectCreationFactory<?>> clazz)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, Class<? extends ObjectCreationFactory<?>> clazz, boolean ignoreCreateExceptions)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, Class<? extends ObjectCreationFactory<?>> clazz, String attributeName)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, Class<? extends ObjectCreationFactory<?>> clazz, String attributeName, boolean ignoreCreateExceptions)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, ObjectCreationFactory<?> creationFactory)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, ObjectCreationFactory<?> creationFactory, boolean ignoreCreateExceptions)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, String className)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, String className, boolean ignoreCreateExceptions)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, String className, String attributeName)` Add a "factory create" rule for the specified parameters.
`void` | `addFactoryCreate(String pattern, String className, String attributeName, boolean ignoreCreateExceptions)` Add a "factory create" rule for the specified parameters.
`void` | `addObjectCreate(String pattern, Class<?> clazz)` Add an "object create" rule for the specified parameters.
`void` | `addObjectCreate(String pattern, String className)` Add an "object create" rule for the specified parameters.
`void` | `addObjectCreate(String pattern, String attributeName, Class<?> clazz)` Add an "object create" rule for the specified parameters.
`void` | `addObjectCreate(String pattern, String className, String attributeName)` Add an "object create" rule for the specified parameters.
`void` | `addObjectParam(String pattern, int paramIndex, Object paramObj)` Add a "call parameter" rule that sets a parameter from a caller-provided object.
`void` | `addRule(String pattern, Rule rule)` Register a new Rule matching the specified pattern.
`void` | `addRuleSet(RuleSet ruleSet)` Register a set of Rule instances defined in a RuleSet.
`void` | `addSetNestedProperties(String pattern)` Adds an `SetNestedPropertiesRule`.
`void` | `addSetNestedProperties(String pattern, String[] elementNames, String[] propertyNames)` Adds an `SetNestedPropertiesRule`.
`void` | `addSetNestedProperties(String pattern, String elementName, String propertyName)` Adds an `SetNestedPropertiesRule`.
`void` | `addSetNext(String pattern, String methodName)` Add a "set next" rule for the specified parameters.
`void` | `addSetNext(String pattern, String methodName, String paramType)` Add a "set next" rule for the specified parameters.
`void` | `addSetProperties(String pattern)` Add a "set properties" rule for the specified parameters.
`void` | `addSetProperties(String pattern, String[] attributeNames, String[] propertyNames)` Add a "set properties" rule with overridden parameters.
`void` | `addSetProperties(String pattern, String attributeName, String propertyName)` Add a "set properties" rule with a single overridden parameter.
`void` | `addSetProperty(String pattern, String name, String value)` Add a "set property" rule for the specified parameters.
`void` | `addSetRoot(String pattern, String methodName)` Add `SetRootRule` with the specified parameters.
`void` | `addSetRoot(String pattern, String methodName, String paramType)` Add `SetRootRule` with the specified parameters.
`void` | `addSetTop(String pattern, String methodName)` Add a "set top" rule for the specified parameters.
`void` | `addSetTop(String pattern, String methodName, String paramType)` Add a "set top" rule for the specified parameters.
`void` | `characters(char[] buffer, int start, int length)`
`protected void` | `cleanup()` Clean up allocated resources after parsing is complete.
`void` | `clear()` Clear the current contents of the default object stack, the param stack, all named stacks, and other internal variables.
`protected void` | `configure()` Provide a hook for lazy configuration of this `Digester` instance.
`InputSource` | `createInputSourceFromURL(String url)` Convenience method that creates an `InputSource` from the string version of a URL.
`InputSource` | `createInputSourceFromURL(URL url)` Given a URL, return an InputSource that reads from that URL.
`SAXException` | `createSAXException(Exception e)` Create a SAX exception which also understands about the location in the digester file where the exception occurs
`SAXException` | `createSAXException(String message)` Create a SAX exception which also understands about the location in the digester file where the exception occurs
`SAXException` | `createSAXException(String message, Exception e)` Create a SAX exception which also understands about the location in the digester file where the exception occurs
`void` | `endDocument()`
`void` | `endElement(String namespaceURI, String localName, String qName)`
`void` | `endPrefixMapping(String prefix)`
`void` | `error(SAXParseException exception)`
`void` | `fatalError(SAXParseException exception)`
`String` | `findNamespaceURI(String prefix)` Return the currently mapped namespace URI for the specified prefix, if any; otherwise return `null`.
`ClassLoader` | `getClassLoader()` Return the class loader to be used for instantiating application objects when required.
`int` | `getCount()` Return the current depth of the element stack.
`String` | `getCurrentElementName()` Return the name of the XML element that is currently being processed.
`Map<String,String>` | `getCurrentNamespaces()` Get the most current namespaces for all prefixes.
`ContentHandler` | `getCustomContentHandler()` returns the custom SAX ContentHandler where events are redirected.
`Locator` | `getDocumentLocator()` Gets the document locator associated with our parser.
`EntityResolver` | `getEntityResolver()` Return the Entity Resolver used by the SAX parser.
`ErrorHandler` | `getErrorHandler()` Return the error handler for this Digester.
`SAXParserFactory` | `getFactory()` Return the SAXParserFactory we will use, creating one if necessary.
`boolean` | `getFeature(String feature)` Returns a flag indicating whether the requested feature is supported by the underlying implementation of `org.xml.sax.XMLReader`.
`org.apache.commons.logging.Log` | `getLogger()` Return the current Logger associated with this instance of the Digester
`String` | `getMatch()` Return the current rule match path
`Stack<List<Rule>>` | `getMatches()` Return a Stack whose elements are List objects, each containing a list of Rule objects as returned from Rules.getMatch().
`boolean` | `getNamespaceAware()` Return the "namespace aware" flag for parsers we create.
`SAXParser` | `getParser()` Return the SAXParser we will use to parse the input stream.
`Object` | `getProperty(String property)` Return the current value of the specified property for the underlying `XMLReader` implementation.
`String` | `getPublicId()` Return the public identifier of the DTD we are currently parsing under, if any.
`
`<T> T`
` | `getRoot()` Returns the root element of the tree of objects created as a result of applying the rule objects to the input XML.
`String` | `getRuleNamespaceURI()` Return the namespace URI that will be applied to all subsequently added `Rule` objects.
`Rules` | `getRules()` Return the `Rules` implementation object containing our rules collection and associated matching policy.
`org.apache.commons.logging.Log` | `getSAXLogger()` Gets the logger used for logging SAX-related information.
`StackAction` | `getStackAction()` Return the callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.
`Substitutor` | `getSubstitutor()` Gets the `Substitutor` used to convert attributes and body text.
`boolean` | `getUseContextClassLoader()` Return the boolean as to whether the context ClassLoader should be used.
`boolean` | `getValidating()` Return the validating parser flag.
`boolean` | `getXIncludeAware()` Return the XInclude-aware flag for parsers we create.
`XMLReader` | `getXMLReader()` Return the XMLReader to be used for parsing the input document.
`Schema` | `getXMLSchema()` Return the XML Schema used when parsing.
`void` | `ignorableWhitespace(char[] buffer, int start, int len)`
`protected void` | `initialize()` Provides a hook for lazy initialization of this `Digester` instance.
`boolean` | `isConfigured()` Checks the Digester instance has been configured.
`boolean` | `isEmpty(String stackName)` Is the stack with the given name empty?
`void` | `notationDecl(String name, String publicId, String systemId)`
`
`<T> T`
` | `parse(File file)` Parse the content of the specified file using this Digester.
`
`<T> T`
` | `parse(InputSource input)` Parse the content of the specified input source using this Digester.
`
`<T> T`
` | `parse(InputStream input)` Parse the content of the specified input stream using this Digester.
`
`<T> T`
` | `parse(Reader reader)` Parse the content of the specified reader using this Digester.
`
`<T> T`
` | `parse(String uri)` Parse the content of the specified URI using this Digester.
`
`<T> T`
` | `parse(URL url)` Parse the content of the specified URL using this Digester.
`
`<T> T`
` | `peek()` Return the top object on the stack without removing it.
`
`<T> T`
` | `peek(int n)` Return the n'th object down the stack, where 0 is the top element and [getCount()-1] is the bottom element.
`
`<T> T`
` | `peek(String stackName)` Gets the top object from the stack with the given name.
`
`<T> T`
` | `peek(String stackName, int n)` Gets the top object from the stack with the given name.
`Object[]` | `peekParams()` Return the top object on the parameters stack without removing it.
`Object[]` | `peekParams(int n)` Return the n'th object down the parameters stack, where 0 is the top element and [getCount()-1] is the bottom element.
`
`<T> T`
` | `pop()` Pop the top object off of the stack, and return it.
`
`<T> T`
` | `pop(String stackName)` Pops (gets and removes) the top object from the stack with the given name.
`Object[]` | `popParams()` Pop the top object off of the parameters stack, and return it.
`void` | `processingInstruction(String target, String data)`
`
`<T> void`
` | `push(String stackName, T value)` Pushes the given object onto the stack with the given name.
`
`<T> void`
` | `push(T object)` Push a new object onto the top of the object stack.
`void` | `pushParams(Object... object)` Push a new object onto the top of the parameters stack.
`void` | `register(String publicId, String entityURL)` Convenience method that registers the string version of an entity URL instead of a URL version.
`void` | `register(String publicId, URL entityURL)` Register the specified DTD URL for the specified public identifier.
`void` | `registerAll(Map<String,URL> entityValidator)` Convenience method that registers DTD URLs for the specified public identifiers.
`void` | `resetRoot()` This method allows the "root" variable to be reset to null.
`InputSource` | `resolveEntity(String publicId, String systemId)`
`void` | `setClassLoader(ClassLoader classLoader)` Set the class loader to be used for instantiating application objects when required.
`void` | `setCustomContentHandler(ContentHandler handler)` Redirects (or cancels redirecting) of SAX ContentHandler events to an external object.
`void` | `setDocumentLocator(Locator locator)`
`void` | `setEntityResolver(EntityResolver entityResolver)` Set the `EntityResolver` used by SAX when resolving public id and system id.
`void` | `setErrorHandler(ErrorHandler errorHandler)` Set the error handler for this Digester.
`void` | `setFeature(String feature, boolean value)` Sets a flag indicating whether the requested feature is supported by the underlying implementation of `org.xml.sax.XMLReader`.
`void` | `setLogger(org.apache.commons.logging.Log log)` Set the current logger for this Digester.
`void` | `setNamespaceAware(boolean namespaceAware)` Set the "namespace aware" flag for parsers we create.
`void` | `setProperty(String property, Object value)` Set the current value of the specified property for the underlying `XMLReader` implementation.
`void` | `setPublicId(String publicId)` Set the public id of the current file being parse.
`void` | `setRuleNamespaceURI(String ruleNamespaceURI)` Set the namespace URI that will be applied to all subsequently added `Rule` objects.
`void` | `setRules(Rules rules)` Set the `Rules` implementation object containing our rules collection and associated matching policy.
`void` | `setSAXLogger(org.apache.commons.logging.Log saxLog)` Sets the logger used for logging SAX-related information.
`void` | `setStackAction(StackAction stackAction)` Define a callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.
`void` | `setSubstitutor(Substitutor substitutor)` Sets the `Substitutor` to be used to convert attributes and body text.
`void` | `setUseContextClassLoader(boolean use)` Determine whether to use the Context ClassLoader (the one found by calling `Thread.currentThread().getContextClassLoader()`) to resolve/load classes that are defined in various rules.
`void` | `setValidating(boolean validating)` Set the validating parser flag.
`void` | `setXIncludeAware(boolean xincludeAware)` Set the XInclude-aware flag for parsers we create.
`void` | `setXMLSchema(Schema schema)` Set the XML Schema to be used when parsing.
`void` | `skippedEntity(String name)`
`void` | `startDocument()`
`void` | `startElement(String namespaceURI, String localName, String qName, Attributes list)`
`void` | `startPrefixMapping(String prefix, String namespaceURI)`
`void` | `unparsedEntityDecl(String name, String publicId, String systemId, String notation)`
`void` | `warning(SAXParseException exception)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### W3C_XML_SCHEMA

    protected static final String W3C_XML_SCHEMA

  The schema language supported. By default, we use this one.

  See Also:
    Constant Field Values

### inputSources

    protected List<InputSource> inputSources

  `List` of `InputSource` instances created by a `createInputSourceFromURL()` method call. These represent open input streams that need to be closed to avoid resource leaks, as well as potentially locked JAR files on Windows.

Constructor Detail

### Digester

    public Digester()

  Construct a new Digester with default properties.

### Digester

    public Digester(SAXParser parser)

  Construct a new Digester, allowing a SAXParser to be passed in. This allows Digester to be used in environments which are unfriendly to JAXP1.1 (such as WebLogic 6.0). This may help in places where you are able to load JAXP 1.1 classes yourself.

  Parameters:
    `parser` - The SAXParser used to parse XML streams

### Digester

    public Digester(XMLReader reader)

  Construct a new Digester, allowing an XMLReader to be passed in. This allows Digester to be used in environments which are unfriendly to JAXP1.1 (such as WebLogic 6.0). Note that if you use this option you have to configure namespace and validation support yourself, as these properties only affect the SAXParser and emtpy constructor.

  Parameters:
    `reader` - The XMLReader used to parse XML streams

Method Detail

### findNamespaceURI

    public String findNamespaceURI(String prefix)

  Return the currently mapped namespace URI for the specified prefix, if any; otherwise return `null`. These mappings come and go dynamically as the document is parsed.

  Parameters:
    `prefix` - Prefix to look up
  Returns:
    the currently mapped namespace URI for the specified prefix

### getClassLoader

    public ClassLoader getClassLoader()

  Return the class loader to be used for instantiating application objects when required. This is determined based upon the following rules:
  - The class loader set by `setClassLoader()`, if any
  - The thread context class loader, if it exists and the `useContextClassLoader` property is set to true
  - The class loader used to load the Digester class itself.

  Returns:
    the class loader to be used for instantiating application objects.

### setClassLoader

    public void setClassLoader(ClassLoader classLoader)

  Set the class loader to be used for instantiating application objects when required.

  Parameters:
    `classLoader` - The new class loader to use, or `null` to revert to the standard rules

### getCount

    public int getCount()

  Return the current depth of the element stack.

  Returns:
    the current depth of the element stack.

### getCurrentElementName

    public String getCurrentElementName()

  Return the name of the XML element that is currently being processed.

  Returns:
    the name of the XML element that is currently being processed.

### getErrorHandler

    public ErrorHandler getErrorHandler()

  Return the error handler for this Digester.

  Returns:
    the error handler for this Digester.

### setErrorHandler

    public void setErrorHandler(ErrorHandler errorHandler)

  Set the error handler for this Digester.

  Parameters:
    `errorHandler` - The new error handler

### getFactory

    public SAXParserFactory getFactory()

  Return the SAXParserFactory we will use, creating one if necessary.

  Returns:
    the SAXParserFactory we will use, creating one if necessary.

### getFeature

    public boolean getFeature(String feature)
                       throws ParserConfigurationException,
                              SAXNotRecognizedException,
                              SAXNotSupportedException

  Returns a flag indicating whether the requested feature is supported by the underlying implementation of `org.xml.sax.XMLReader`. See the saxproject website for information about the standard SAX2 feature flags.

  Parameters:
    `feature` - Name of the feature to inquire about
  Returns:
    true, if the requested feature is supported by the underlying implementation of `org.xml.sax.XMLReader`, false otherwise
  Throws:
    `ParserConfigurationException` - if a parser configuration error occurs
    `SAXNotRecognizedException` - if the property name is not recognized
    `SAXNotSupportedException` - if the property name is recognized but not supported

### setFeature

    public void setFeature(String feature,
                           boolean value)
                    throws ParserConfigurationException,
                           SAXNotRecognizedException,
                           SAXNotSupportedException

  Sets a flag indicating whether the requested feature is supported by the underlying implementation of `org.xml.sax.XMLReader`. See the saxproject website for information about the standard SAX2 feature flags. In order to be effective, this method must be called before the `getParser()` method is called for the first time, either directly or indirectly.

  Parameters:
    `feature` - Name of the feature to set the status for
    `value` - The new value for this feature
  Throws:
    `ParserConfigurationException` - if a parser configuration error occurs
    `SAXNotRecognizedException` - if the property name is not recognized
    `SAXNotSupportedException` - if the property name is recognized but not supported

### getLogger

    public org.apache.commons.logging.Log getLogger()

  Return the current Logger associated with this instance of the Digester

  Returns:
    the current Logger associated with this instance of the Digester

### setLogger

    public void setLogger(org.apache.commons.logging.Log log)

  Set the current logger for this Digester.

  Parameters:
    `log` - the current logger for this Digester.

### getSAXLogger

    public org.apache.commons.logging.Log getSAXLogger()

  Gets the logger used for logging SAX-related information. Note the output is finely grained.

  Returns:
    the logger used for logging SAX-related information
  Since:
    1.6

### setSAXLogger

    public void setSAXLogger(org.apache.commons.logging.Log saxLog)

  Sets the logger used for logging SAX-related information. Note the output is finely grained.

  Parameters:
    `saxLog` - the logger used for logging SAX-related information, not null
  Since:
    1.6

### getMatch

    public String getMatch()

  Return the current rule match path

  Returns:
    the current rule match path

### getMatches

    public Stack<List<Rule>> getMatches()

  Return a Stack whose elements are List objects, each containing a list of Rule objects as returned from Rules.getMatch().

  Returns:
    a Stack whose elements are List objects, each containing a list of Rule objects as returned from Rules.getMatch().
  Since:
    3.0

### getNamespaceAware

    public boolean getNamespaceAware()

  Return the "namespace aware" flag for parsers we create.

  Returns:
    the "namespace aware" flag for parsers we create.

### setNamespaceAware

    public void setNamespaceAware(boolean namespaceAware)

  Set the "namespace aware" flag for parsers we create.

  Parameters:
    `namespaceAware` - The new "namespace aware" flag

### getXIncludeAware

    public boolean getXIncludeAware()

  Return the XInclude-aware flag for parsers we create. XInclude functionality additionally requires namespace-awareness.

  Returns:
    The XInclude-aware flag
  Since:
    2.0
  See Also:
    `getNamespaceAware()`

### setXIncludeAware

    public void setXIncludeAware(boolean xincludeAware)

  Set the XInclude-aware flag for parsers we create. This additionally requires namespace-awareness.

  Parameters:
    `xincludeAware` - The new XInclude-aware flag
  Since:
    2.0
  See Also:
    `setNamespaceAware(boolean)`

### setPublicId

    public void setPublicId(String publicId)

  Set the public id of the current file being parse.

  Parameters:
    `publicId` - the DTD/Schema public's id.

### getPublicId

    public String getPublicId()

  Return the public identifier of the DTD we are currently parsing under, if any.

  Returns:
    the public identifier of the DTD we are currently parsing under, if any.

### getRuleNamespaceURI

    public String getRuleNamespaceURI()

  Return the namespace URI that will be applied to all subsequently added `Rule` objects.

  Returns:
    the namespace URI that will be applied to all subsequently added `Rule` objects.

### setRuleNamespaceURI

    public void setRuleNamespaceURI(String ruleNamespaceURI)

  Set the namespace URI that will be applied to all subsequently added `Rule` objects.

  Parameters:
    `ruleNamespaceURI` - Namespace URI that must match on all subsequently added rules, or `null` for matching regardless of the current namespace URI

### getParser

    public SAXParser getParser()

  Return the SAXParser we will use to parse the input stream. If there is a problem creating the parser, return `null`.

  Returns:
    the SAXParser we will use to parse the input stream

### getProperty

    public Object getProperty(String property)
                       throws SAXNotRecognizedException,
                              SAXNotSupportedException

  Return the current value of the specified property for the underlying `XMLReader` implementation. See the saxproject website for information about the standard SAX2 properties.

  Parameters:
    `property` - Property name to be retrieved
  Returns:
    the current value of the specified property for the underlying `XMLReader` implementation.
  Throws:
    `SAXNotRecognizedException` - if the property name is not recognized
    `SAXNotSupportedException` - if the property name is recognized but not supported

### setProperty

    public void setProperty(String property,
                            Object value)
                     throws SAXNotRecognizedException,
                            SAXNotSupportedException

  Set the current value of the specified property for the underlying `XMLReader` implementation. See the saxproject website for information about the standard SAX2 properties.

  Parameters:
    `property` - Property name to be set
    `value` - Property value to be set
  Throws:
    `SAXNotRecognizedException` - if the property name is not recognized
    `SAXNotSupportedException` - if the property name is recognized but not supported

### getRules

    public Rules getRules()

  Return the `Rules` implementation object containing our rules collection and associated matching policy. If none has been established, a default implementation will be created and returned.

  Returns:
    the `Rules` implementation object.

### setRules

    public void setRules(Rules rules)

  Set the `Rules` implementation object containing our rules collection and associated matching policy.

  Parameters:
    `rules` - New Rules implementation

### getXMLSchema

    public Schema getXMLSchema()

  Return the XML Schema used when parsing.

  Returns:
    The `Schema` instance in use.
  Since:
    2.0

### setXMLSchema

    public void setXMLSchema(Schema schema)

  Set the XML Schema to be used when parsing.

  Parameters:
    `schema` - The `Schema` instance to use.
  Since:
    2.0

### getUseContextClassLoader

    public boolean getUseContextClassLoader()

  Return the boolean as to whether the context ClassLoader should be used.

  Returns:
    true, if the context ClassLoader should be used, false otherwise.

### setUseContextClassLoader

    public void setUseContextClassLoader(boolean use)

  Determine whether to use the Context ClassLoader (the one found by calling `Thread.currentThread().getContextClassLoader()`) to resolve/load classes that are defined in various rules. If not using Context ClassLoader, then the class-loading defaults to using the calling-class' ClassLoader.

  Parameters:
    `use` - determines whether to use Context ClassLoader.

### getValidating

    public boolean getValidating()

  Return the validating parser flag.

  Returns:
    the validating parser flag.

### setValidating

    public void setValidating(boolean validating)

  Set the validating parser flag. This must be called before `parse()` is called the first time.

  Parameters:
    `validating` - The new validating parser flag.

### getXMLReader

    public XMLReader getXMLReader()
                           throws SAXException

  Return the XMLReader to be used for parsing the input document. FIXME: there is a bug in JAXP/XERCES that prevent the use of a parser that contains a schema with a DTD.

  Returns:
    the XMLReader to be used for parsing the input document.
  Throws:
    `SAXException` - if no XMLReader can be instantiated

### getSubstitutor

    public Substitutor getSubstitutor()

  Gets the `Substitutor` used to convert attributes and body text.

  Returns:
    the `Substitutor` used to convert attributes and body text, null if not substitutions are to be performed.

### setSubstitutor

    public void setSubstitutor(Substitutor substitutor)

  Sets the `Substitutor` to be used to convert attributes and body text.

  Parameters:
    `substitutor` - the Substitutor to be used to convert attributes and body text or null if not substitution of these values is to be performed.

### getCustomContentHandler

    public ContentHandler getCustomContentHandler()

  returns the custom SAX ContentHandler where events are redirected.

  Returns:
    the custom SAX ContentHandler where events are redirected.
  Since:
    1.7
  See Also:
    `setCustomContentHandler(ContentHandler)`

### setCustomContentHandler

    public void setCustomContentHandler(ContentHandler handler)

  Redirects (or cancels redirecting) of SAX ContentHandler events to an external object.

  When this object's customContentHandler is non-null, any SAX events received from the parser will simply be passed on to the specified object instead of this object handling them. This allows Rule classes to take control of the SAX event stream for a while in order to do custom processing. Such a rule should save the old value before setting a new one, and restore the old value in order to resume normal digester processing.

  An example of a Rule which needs this feature is NodeCreateRule.

  Note that saving the old value is probably not needed as it should always be null; a custom rule that wants to take control could only have been called when there was no custom content handler. But it seems cleaner to properly save/restore the value and maybe some day this will come in useful.

  Note also that this is not quite equivalent to

       digester.getXMLReader().setContentHandler( handler )

  for these reasons:
  - Some xml parsers don't like having setContentHandler called after parsing has started. The Aelfred parser is one example.
  - Directing the events via the Digester object potentially allows us to log information about those SAX events at the digester level.

  Parameters:
    `handler` - the custom SAX ContentHandler where events are redirected.
  Since:
    1.7

### setStackAction

    public void setStackAction(StackAction stackAction)

  Define a callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.

  Parameters:
    `stackAction` - the callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.
  Since:
    1.8

### getStackAction

    public StackAction getStackAction()

  Return the callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.

  Returns:
    the callback object which is invoked whenever an object is pushed onto a digester object stack, or popped off one.
  Since:
    1.8
  See Also:
    `setStackAction(StackAction).`

### getCurrentNamespaces

    public Map<String,String> getCurrentNamespaces()

  Get the most current namespaces for all prefixes.

  Returns:
    Map A map with namespace prefixes as keys and most current namespace URIs for the corresponding prefixes as values
  Since:
    1.8

### characters

    public void characters(char[] buffer,
                           int start,
                           int length)
                    throws SAXException

  Specified by:
    `characters` in interface `ContentHandler`
  Overrides:
    `characters` in class `DefaultHandler`
  Throws:
    `SAXException`

### endDocument

    public void endDocument()
                     throws SAXException

  Specified by:
    `endDocument` in interface `ContentHandler`
  Overrides:
    `endDocument` in class `DefaultHandler`
  Throws:
    `SAXException`

### endElement

    public void endElement(String namespaceURI,
                           String localName,
                           String qName)
                    throws SAXException

  Specified by:
    `endElement` in interface `ContentHandler`
  Overrides:
    `endElement` in class `DefaultHandler`
  Throws:
    `SAXException`

### endPrefixMapping

    public void endPrefixMapping(String prefix)
                          throws SAXException

  Specified by:
    `endPrefixMapping` in interface `ContentHandler`
  Overrides:
    `endPrefixMapping` in class `DefaultHandler`
  Throws:
    `SAXException`

### ignorableWhitespace

    public void ignorableWhitespace(char[] buffer,
                                    int start,
                                    int len)
                             throws SAXException

  Specified by:
    `ignorableWhitespace` in interface `ContentHandler`
  Overrides:
    `ignorableWhitespace` in class `DefaultHandler`
  Throws:
    `SAXException`

### processingInstruction

    public void processingInstruction(String target,
                                      String data)
                               throws SAXException

  Specified by:
    `processingInstruction` in interface `ContentHandler`
  Overrides:
    `processingInstruction` in class `DefaultHandler`
  Throws:
    `SAXException`

### getDocumentLocator

    public Locator getDocumentLocator()

  Gets the document locator associated with our parser.

  Returns:
    the Locator supplied by the document parser

### setDocumentLocator

    public void setDocumentLocator(Locator locator)

  Specified by:
    `setDocumentLocator` in interface `ContentHandler`
  Overrides:
    `setDocumentLocator` in class `DefaultHandler`

### skippedEntity

    public void skippedEntity(String name)
                       throws SAXException

  Specified by:
    `skippedEntity` in interface `ContentHandler`
  Overrides:
    `skippedEntity` in class `DefaultHandler`
  Throws:
    `SAXException`

### startDocument

    public void startDocument()
                       throws SAXException

  Specified by:
    `startDocument` in interface `ContentHandler`
  Overrides:
    `startDocument` in class `DefaultHandler`
  Throws:
    `SAXException`

### startElement

    public void startElement(String namespaceURI,
                             String localName,
                             String qName,
                             Attributes list)
                      throws SAXException

  Specified by:
    `startElement` in interface `ContentHandler`
  Overrides:
    `startElement` in class `DefaultHandler`
  Throws:
    `SAXException`

### startPrefixMapping

    public void startPrefixMapping(String prefix,
                                   String namespaceURI)
                            throws SAXException

  Specified by:
    `startPrefixMapping` in interface `ContentHandler`
  Overrides:
    `startPrefixMapping` in class `DefaultHandler`
  Throws:
    `SAXException`

### notationDecl

    public void notationDecl(String name,
                             String publicId,
                             String systemId)

  Specified by:
    `notationDecl` in interface `DTDHandler`
  Overrides:
    `notationDecl` in class `DefaultHandler`

### unparsedEntityDecl

    public void unparsedEntityDecl(String name,
                                   String publicId,
                                   String systemId,
                                   String notation)

  Specified by:
    `unparsedEntityDecl` in interface `DTDHandler`
  Overrides:
    `unparsedEntityDecl` in class `DefaultHandler`

### setEntityResolver

    public void setEntityResolver(EntityResolver entityResolver)

  Set the `EntityResolver` used by SAX when resolving public id and system id. This must be called before the first call to `parse()`.

  Parameters:
    `entityResolver` - a class that implement the `EntityResolver` interface.

### getEntityResolver

    public EntityResolver getEntityResolver()

  Return the Entity Resolver used by the SAX parser.

  Returns:
    the Entity Resolver used by the SAX parser.

### resolveEntity

    public InputSource resolveEntity(String publicId,
                                     String systemId)
                              throws SAXException

  Specified by:
    `resolveEntity` in interface `EntityResolver`
  Overrides:
    `resolveEntity` in class `DefaultHandler`
  Throws:
    `SAXException`

### error

    public void error(SAXParseException exception)
               throws SAXException

  Specified by:
    `error` in interface `ErrorHandler`
  Overrides:
    `error` in class `DefaultHandler`
  Throws:
    `SAXException`

### fatalError

    public void fatalError(SAXParseException exception)
                    throws SAXException

  Specified by:
    `fatalError` in interface `ErrorHandler`
  Overrides:
    `fatalError` in class `DefaultHandler`
  Throws:
    `SAXException`

### warning

    public void warning(SAXParseException exception)
                 throws SAXException

  Specified by:
    `warning` in interface `ErrorHandler`
  Overrides:
    `warning` in class `DefaultHandler`
  Throws:
    `SAXException`

### parse

    public <T> T parse(File file)
            throws IOException,
                   SAXException

  Parse the content of the specified file using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `file` - File containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs

### parse

    public <T> T parse(InputSource input)
            throws IOException,
                   SAXException

  Parse the content of the specified input source using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `input` - Input source containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs

### parse

    public <T> T parse(InputStream input)
            throws IOException,
                   SAXException

  Parse the content of the specified input stream using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `input` - Input stream containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs

### parse

    public <T> T parse(Reader reader)
            throws IOException,
                   SAXException

  Parse the content of the specified reader using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `reader` - Reader containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs

### parse

    public <T> T parse(String uri)
            throws IOException,
                   SAXException

  Parse the content of the specified URI using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `uri` - URI containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs

### parse

    public <T> T parse(URL url)
            throws IOException,
                   SAXException

  Parse the content of the specified URL using this Digester. Returns the root element from the object stack (if any).

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `url` - URL containing the XML data to be parsed
  Returns:
    the root element from the object stack (if any)
  Throws:
    `IOException` - if an input/output error occurs
    `SAXException` - if a parsing exception occurs
  Since:
    1.8

### register

    public void register(String publicId,
                         URL entityURL)

  Register the specified DTD URL for the specified public identifier. This must be called before the first call to `parse()`.

  `Digester` contains an internal `EntityResolver` implementation. This maps `PUBLICID`'s to URLs (from which the resource will be loaded). A common use case for this method is to register local URLs (possibly computed at runtime by a classloader) for DTDs. This allows the performance advantage of using a local version without having to ensure every `SYSTEM` URI on every processed xml document is local. This implementation provides only basic functionality. If more sophisticated features are required, using `setEntityResolver(org.xml.sax.EntityResolver)` to set a custom resolver is recommended.

  Note: This method will have no effect when a custom `EntityResolver` has been set. (Setting a custom `EntityResolver` overrides the internal implementation.)

  Parameters:
    `publicId` - Public identifier of the DTD to be resolved
    `entityURL` - The URL to use for reading this DTD
  Since:
    1.8

### register

    public void register(String publicId,
                         String entityURL)

  Convenience method that registers the string version of an entity URL instead of a URL version.

  Parameters:
    `publicId` - Public identifier of the entity to be resolved
    `entityURL` - The URL to use for reading this entity

### registerAll

    public void registerAll(Map<String,URL> entityValidator)

  Convenience method that registers DTD URLs for the specified public identifiers.

  Parameters:
    `entityValidator` - The URLs of entityValidator that have been registered, keyed by the public identifier that corresponds.
  Since:
    3.0

### createInputSourceFromURL

    public InputSource createInputSourceFromURL(URL url)
                                         throws IOException

  Given a URL, return an InputSource that reads from that URL.

  Ideally this function would not be needed and code could just use `new InputSource(entityURL)`. Unfortunately it appears that when the entityURL points to a file within a jar archive a caching mechanism inside the InputSource implementation causes a file-handle to the jar file to remain open. On Windows systems this then causes the jar archive file to be locked on disk ("in use") which makes it impossible to delete the jar file - and that really stuffs up "undeploy" in webapps in particular.

  In JDK1.4 and later, Apache XercesJ is used as the xml parser. The InputSource object provided is converted into an XMLInputSource, and eventually passed to an instance of XMLDocumentScannerImpl to specify the source data to be converted into tokens for the rest of the XMLReader code to handle. XMLDocumentScannerImpl calls fEntityManager.startDocumentEntity(source), where fEntityManager is declared in ancestor class XMLScanner to be an XMLEntityManager. In that class, if the input source stream is null, then:

       URL location = new URL( expandedSystemId );
       URLConnection connect = location.openConnection();
       if ( connect instanceof HttpURLConnection )
       {
           setHttpProperties( connect, xmlInputSource );
       }
       stream = connect.getInputStream();

  This method pretty much duplicates the standard behaviour, except that it calls URLConnection.setUseCaches(false) before opening the connection.

  Parameters:
    `url` - The URL has to be read
  Returns:
    The InputSource that reads from the input URL
  Throws:
    `IOException` - if any error occurs while reading the input URL
  Since:
    1.8

### createInputSourceFromURL

    public InputSource createInputSourceFromURL(String url)
                                         throws IOException

  Convenience method that creates an `InputSource` from the string version of a URL.

  Parameters:
    `url` - URL for which to create an `InputSource`
  Returns:
    The InputSource that reads from the input URL
  Throws:
    `IOException` - if any error occurs while reading the input URL
  Since:
    1.8

### addRule

    public void addRule(String pattern,
                        Rule rule)

  Register a new Rule matching the specified pattern. This method sets the `Digester` property on the rule.

  Parameters:
    `pattern` - Element matching pattern
    `rule` - Rule to be registered

### addRuleSet

    public void addRuleSet(RuleSet ruleSet)

  Register a set of Rule instances defined in a RuleSet.

  Parameters:
    `ruleSet` - The RuleSet instance to configure from

### addBeanPropertySetter

    public void addBeanPropertySetter(String pattern)

  Add a "bean property setter" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
  See Also:
    `BeanPropertySetterRule`

### addBeanPropertySetter

    public void addBeanPropertySetter(String pattern,
                                      String propertyName)

  Add a "bean property setter" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `propertyName` - Name of property to set
  See Also:
    `BeanPropertySetterRule`

### addCallMethod

    public void addCallMethod(String pattern,
                              String methodName)

  Add an "call method" rule for a method which accepts no arguments.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to be called
  See Also:
    `CallMethodRule`

### addCallMethod

    public void addCallMethod(String pattern,
                              String methodName,
                              int paramCount)

  Add an "call method" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to be called
    `paramCount` - Number of expected parameters (or zero for a single parameter from the body of this element)
  See Also:
    `CallMethodRule`

### addCallMethod

    public void addCallMethod(String pattern,
                              String methodName,
                              int paramCount,
                              String[] paramTypes)

  Add an "call method" rule for the specified parameters. If `paramCount` is set to zero the rule will use the body of the matched element as the single argument of the method, unless `paramTypes` is null or empty, in this case the rule will call the specified method with no arguments.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to be called
    `paramCount` - Number of expected parameters (or zero for a single parameter from the body of this element)
    `paramTypes` - Set of Java class names for the types of the expected parameters (if you wish to use a primitive type, specify the corresonding Java wrapper class instead, such as `java.lang.Boolean` for a `boolean` parameter)
  See Also:
    `CallMethodRule`

### addCallMethod

    public void addCallMethod(String pattern,
                              String methodName,
                              int paramCount,
                              Class<?>[] paramTypes)

  Add an "call method" rule for the specified parameters. If `paramCount` is set to zero the rule will use the body of the matched element as the single argument of the method, unless `paramTypes` is null or empty, in this case the rule will call the specified method with no arguments.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to be called
    `paramCount` - Number of expected parameters (or zero for a single parameter from the body of this element)
    `paramTypes` - The Java class names of the arguments (if you wish to use a primitive type, specify the corresonding Java wrapper class instead, such as `java.lang.Boolean` for a `boolean` parameter)
  See Also:
    `CallMethodRule`

### addCallParam

    public void addCallParam(String pattern,
                             int paramIndex)

  Add a "call parameter" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `paramIndex` - Zero-relative parameter index to set (from the body of this element)
  See Also:
    `CallParamRule`

### addCallParam

    public void addCallParam(String pattern,
                             int paramIndex,
                             String attributeName)

  Add a "call parameter" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `paramIndex` - Zero-relative parameter index to set (from the specified attribute)
    `attributeName` - Attribute whose value is used as the parameter value
  See Also:
    `CallParamRule`

### addCallParam

    public void addCallParam(String pattern,
                             int paramIndex,
                             boolean fromStack)

  Add a "call parameter" rule. This will either take a parameter from the stack or from the current element body text.

  Parameters:
    `pattern` - Element matching pattern
    `paramIndex` - The zero-relative parameter number
    `fromStack` - Should the call parameter be taken from the top of the stack?
  See Also:
    `CallParamRule`

### addCallParam

    public void addCallParam(String pattern,
                             int paramIndex,
                             int stackIndex)

  Add a "call parameter" rule that sets a parameter from the stack. This takes a parameter from the given position on the stack.

  Parameters:
    `pattern` - Element matching pattern
    `paramIndex` - The zero-relative parameter number
    `stackIndex` - set the call parameter to the stackIndex'th object down the stack, where 0 is the top of the stack, 1 the next element down and so on
  See Also:
    `CallMethodRule`

### addCallParamPath

    public void addCallParamPath(String pattern,
                                 int paramIndex)

  Add a "call parameter" rule that sets a parameter from the current `Digester` matching path. This is sometimes useful when using rules that support wildcards.

  Parameters:
    `pattern` - the pattern that this rule should match
    `paramIndex` - The zero-relative parameter number
  See Also:
    `CallMethodRule`

### addObjectParam

    public void addObjectParam(String pattern,
                               int paramIndex,
                               Object paramObj)

  Add a "call parameter" rule that sets a parameter from a caller-provided object. This can be used to pass constants such as strings to methods; it can also be used to pass mutable objects, providing ways for objects to do things like "register" themselves with some shared object.

  Note that when attempting to locate a matching method to invoke, the true type of the paramObj is used, so that despite the paramObj being passed in here as type Object, the target method can declare its parameters as being the true type of the object (or some ancestor type, according to the usual type-conversion rules).

  Parameters:
    `pattern` - Element matching pattern
    `paramIndex` - The zero-relative parameter number
    `paramObj` - Any arbitrary object to be passed to the target method.
  Since:
    1.6
  See Also:
    `CallMethodRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 String className)

  Add a "factory create" rule for the specified parameters. Exceptions thrown during the object creation process will be propagated.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Java class name of the object creation factory class
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 Class<? extends ObjectCreationFactory<?>> clazz)

  Add a "factory create" rule for the specified parameters. Exceptions thrown during the object creation process will be propagated.

  Parameters:
    `pattern` - Element matching pattern
    `clazz` - Java class of the object creation factory class
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 String className,
                                 String attributeName)

  Add a "factory create" rule for the specified parameters. Exceptions thrown during the object creation process will be propagated.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Java class name of the object creation factory class
    `attributeName` - Attribute name which, if present, overrides the value specified by `className`
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 Class<? extends ObjectCreationFactory<?>> clazz,
                                 String attributeName)

  Add a "factory create" rule for the specified parameters. Exceptions thrown during the object creation process will be propagated.

  Parameters:
    `pattern` - Element matching pattern
    `clazz` - Java class of the object creation factory class
    `attributeName` - Attribute name which, if present, overrides the value specified by `className`
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 ObjectCreationFactory<?> creationFactory)

  Add a "factory create" rule for the specified parameters. Exceptions thrown during the object creation process will be propagated.

  Parameters:
    `pattern` - Element matching pattern
    `creationFactory` - Previously instantiated ObjectCreationFactory to be utilized
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 String className,
                                 boolean ignoreCreateExceptions)

  Add a "factory create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Java class name of the object creation factory class
    `ignoreCreateExceptions` - when `true` any exceptions thrown during object creation will be ignored.
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 Class<? extends ObjectCreationFactory<?>> clazz,
                                 boolean ignoreCreateExceptions)

  Add a "factory create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `clazz` - Java class of the object creation factory class
    `ignoreCreateExceptions` - when `true` any exceptions thrown during object creation will be ignored.
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 String className,
                                 String attributeName,
                                 boolean ignoreCreateExceptions)

  Add a "factory create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Java class name of the object creation factory class
    `attributeName` - Attribute name which, if present, overrides the value specified by `className`
    `ignoreCreateExceptions` - when `true` any exceptions thrown during object creation will be ignored.
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 Class<? extends ObjectCreationFactory<?>> clazz,
                                 String attributeName,
                                 boolean ignoreCreateExceptions)

  Add a "factory create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `clazz` - Java class of the object creation factory class
    `attributeName` - Attribute name which, if present, overrides the value specified by `className`
    `ignoreCreateExceptions` - when `true` any exceptions thrown during object creation will be ignored.
  See Also:
    `FactoryCreateRule`

### addFactoryCreate

    public void addFactoryCreate(String pattern,
                                 ObjectCreationFactory<?> creationFactory,
                                 boolean ignoreCreateExceptions)

  Add a "factory create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `creationFactory` - Previously instantiated ObjectCreationFactory to be utilized
    `ignoreCreateExceptions` - when `true` any exceptions thrown during object creation will be ignored.
  See Also:
    `FactoryCreateRule`

### addObjectCreate

    public void addObjectCreate(String pattern,
                                String className)

  Add an "object create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Java class name to be created
  See Also:
    `ObjectCreateRule`

### addObjectCreate

    public void addObjectCreate(String pattern,
                                Class<?> clazz)

  Add an "object create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `clazz` - Java class to be created
  See Also:
    `ObjectCreateRule`

### addObjectCreate

    public void addObjectCreate(String pattern,
                                String className,
                                String attributeName)

  Add an "object create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `className` - Default Java class name to be created
    `attributeName` - Attribute name that optionally overrides the default Java class name to be created
  See Also:
    `ObjectCreateRule`

### addObjectCreate

    public void addObjectCreate(String pattern,
                                String attributeName,
                                Class<?> clazz)

  Add an "object create" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `attributeName` - Attribute name that optionally overrides
    `clazz` - Default Java class to be created the default Java class name to be created
  See Also:
    `ObjectCreateRule`

### addSetNestedProperties

    public void addSetNestedProperties(String pattern)

  Adds an `SetNestedPropertiesRule`.

  Parameters:
    `pattern` - register the rule with this pattern
  Since:
    1.6

### addSetNestedProperties

    public void addSetNestedProperties(String pattern,
                                       String elementName,
                                       String propertyName)

  Adds an `SetNestedPropertiesRule`.

  Parameters:
    `pattern` - register the rule with this pattern
    `elementName` - elment name that a property maps to
    `propertyName` - property name of the element mapped from
  Since:
    1.6

### addSetNestedProperties

    public void addSetNestedProperties(String pattern,
                                       String[] elementNames,
                                       String[] propertyNames)

  Adds an `SetNestedPropertiesRule`.

  Parameters:
    `pattern` - register the rule with this pattern
    `elementNames` - elment names that (in order) map to properties
    `propertyNames` - property names that (in order) elements are mapped to
  Since:
    1.6

### addSetNext

    public void addSetNext(String pattern,
                           String methodName)

  Add a "set next" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the parent element
  See Also:
    `SetNextRule`

### addSetNext

    public void addSetNext(String pattern,
                           String methodName,
                           String paramType)

  Add a "set next" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the parent element
    `paramType` - Java class name of the expected parameter type (if you wish to use a primitive type, specify the corresonding Java wrapper class instead, such as `java.lang.Boolean` for a `boolean` parameter)
  See Also:
    `SetNextRule`

### addSetRoot

    public void addSetRoot(String pattern,
                           String methodName)

  Add `SetRootRule` with the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the root object
  See Also:
    `SetRootRule`

### addSetRoot

    public void addSetRoot(String pattern,
                           String methodName,
                           String paramType)

  Add `SetRootRule` with the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the root object
    `paramType` - Java class name of the expected parameter type
  See Also:
    `SetRootRule`

### addSetProperties

    public void addSetProperties(String pattern)

  Add a "set properties" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
  See Also:
    `SetPropertiesRule`

### addSetProperties

    public void addSetProperties(String pattern,
                                 String attributeName,
                                 String propertyName)

  Add a "set properties" rule with a single overridden parameter. See `SetPropertiesRule.SetPropertiesRule(String attributeName, String propertyName)`

  Parameters:
    `pattern` - Element matching pattern
    `attributeName` - map this attribute
    `propertyName` - to this property
  See Also:
    `SetPropertiesRule`

### addSetProperties

    public void addSetProperties(String pattern,
                                 String[] attributeNames,
                                 String[] propertyNames)

  Add a "set properties" rule with overridden parameters. See `SetPropertiesRule.SetPropertiesRule(String [] attributeNames, String [] propertyNames)`

  Parameters:
    `pattern` - Element matching pattern
    `attributeNames` - names of attributes with custom mappings
    `propertyNames` - property names these attributes map to
  See Also:
    `SetPropertiesRule`

### addSetProperty

    public void addSetProperty(String pattern,
                               String name,
                               String value)

  Add a "set property" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `name` - Attribute name containing the property name to be set
    `value` - Attribute name containing the property value to set
  See Also:
    `SetPropertyRule`

### addSetTop

    public void addSetTop(String pattern,
                          String methodName)

  Add a "set top" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the parent element
  See Also:
    `SetTopRule`

### addSetTop

    public void addSetTop(String pattern,
                          String methodName,
                          String paramType)

  Add a "set top" rule for the specified parameters.

  Parameters:
    `pattern` - Element matching pattern
    `methodName` - Method name to call on the parent element
    `paramType` - Java class name of the expected parameter type (if you wish to use a primitive type, specify the corresonding Java wrapper class instead, such as `java.lang.Boolean` for a `boolean` parameter)
  See Also:
    `SetTopRule`

### clear

    public void clear()

  Clear the current contents of the default object stack, the param stack, all named stacks, and other internal variables.

  Calling this method might allow another document of the same type to be correctly parsed. However this method was not intended for this purpose (just to tidy up memory usage). In general, a separate Digester object should be created for each document to be parsed.

  Note that this method is called automatically after a document has been successfully parsed by a Digester instance. However it is not invoked automatically when a parse fails, so when reusing a Digester instance (which is not recommended) this method must be called manually after a parse failure.

### peek

    public <T> T peek()

  Return the top object on the stack without removing it. If there are no objects on the stack, return `null`.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Returns:
    the top object on the stack without removing it.

### peek

    public <T> T peek(int n)

  Return the n'th object down the stack, where 0 is the top element and [getCount()-1] is the bottom element. If the specified index is out of range, return `null`.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `n` - Index of the desired element, where 0 is the top of the stack, 1 is the next element down, and so on.
  Returns:
    the n'th object down the stack

### pop

    public <T> T pop()

  Pop the top object off of the stack, and return it. If there are no objects on the stack, return `null`.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Returns:
    the top object popped off of the stack

### push

    public <T> void push(T object)

  Push a new object onto the top of the object stack.

  Type Parameters:
    `T` - any type of the pushed object
  Parameters:
    `object` - The new object

### push

    public <T> void push(String stackName,
                         T value)

  Pushes the given object onto the stack with the given name. If no stack already exists with the given name then one will be created.

  Type Parameters:
    `T` - any type of the pushed object
  Parameters:
    `stackName` - the name of the stack onto which the object should be pushed
    `value` - the Object to be pushed onto the named stack.
  Since:
    1.6

### pop

    public <T> T pop(String stackName)

  Pops (gets and removes) the top object from the stack with the given name.

  Note: a stack is considered empty if no objects have been pushed onto it yet.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `stackName` - the name of the stack from which the top value is to be popped.
  Returns:
    the top `Object` on the stack or or null if the stack is either empty or has not been created yet
  Since:
    1.6

### peek

    public <T> T peek(String stackName)

  Gets the top object from the stack with the given name. This method does not remove the object from the stack.

  Note: a stack is considered empty if no objects have been pushed onto it yet.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `stackName` - the name of the stack to be peeked
  Returns:
    the top `Object` on the stack or null if the stack is either empty or has not been created yet
  Since:
    1.6

### peek

    public <T> T peek(String stackName,
                      int n)

  Gets the top object from the stack with the given name. This method does not remove the object from the stack.

  Note: a stack is considered empty if no objects have been pushed onto it yet.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Parameters:
    `stackName` - the name of the stack to be peeked
    `n` - Index of the desired element, where 0 is the top of the stack, 1 is the next element down, and so on.
  Returns:
    the specified `Object` on the stack.
  Since:
    1.6

### isEmpty

    public boolean isEmpty(String stackName)

  Is the stack with the given name empty?

  Note: a stack is considered empty if no objects have been pushed onto it yet.

  Parameters:
    `stackName` - the name of the stack whose emptiness should be evaluated
  Returns:
    true if the given stack if empty
  Since:
    1.6

### getRoot

    public <T> T getRoot()

  Returns the root element of the tree of objects created as a result of applying the rule objects to the input XML.

  If the digester stack was "primed" by explicitly pushing a root object onto the stack before parsing started, then that root object is returned here.

  Alternatively, if a Rule which creates an object (eg ObjectCreateRule) matched the root element of the xml, then the object created will be returned here.

  In other cases, the object most recently pushed onto an empty digester stack is returned. This would be a most unusual use of digester, however; one of the previous configurations is much more likely.

  Note that when using one of the Digester.parse methods, the return value from the parse method is exactly the same as the return value from this method. However when the Digester is being used as a SAXContentHandler, no such return value is available; in this case, this method allows you to access the root object that has been created after parsing has completed.

  Type Parameters:
    `T` - the type used to auto-cast the returned object to the assigned variable type
  Returns:
    the root object that has been created after parsing or null if the digester has not parsed any XML yet.

### resetRoot

    public void resetRoot()

  This method allows the "root" variable to be reset to null.

  It is not considered safe for a digester instance to be reused to parse multiple xml documents. However if you are determined to do so, then you should call both clear() and resetRoot() before each parse.

  Since:
    1.7

### cleanup

    protected void cleanup()

  Clean up allocated resources after parsing is complete. The default method closes input streams that have been created by Digester itself. If you override this method in a subclass, be sure to call `super.cleanup()` to invoke this logic.

  Since:
    1.8

### configure

    protected void configure()

  Provide a hook for lazy configuration of this `Digester` instance. The default implementation does nothing, but subclasses can override as needed.

  Note This method may be called more than once. Once only initialization code should be placed in `initialize()` or the code should take responsibility by checking and setting the `configured` flag.

### isConfigured

    public boolean isConfigured()

  Checks the Digester instance has been configured.

  Returns:
    true, if the Digester instance has been configured, false otherwise
  Since:
    3.0

### initialize

    protected void initialize()

  Provides a hook for lazy initialization of this `Digester` instance. The default implementation does nothing, but subclasses can override as needed. Digester (by default) only calls this method once.

  Note This method will be called by `configure()` only when the `configured` flag is false. Subclasses that override `configure` or who set `configured` may find that this method may be called more than once.

  Since:
    1.6

### peekParams

    public Object[] peekParams()

  Return the top object on the parameters stack without removing it. If there are no objects on the stack, return `null`.

  The parameters stack is used to store `CallMethodRule` parameters. See `params`.

  Returns:
    the top object on the parameters stack without removing it.

### peekParams

    public Object[] peekParams(int n)

  Return the n'th object down the parameters stack, where 0 is the top element and [getCount()-1] is the bottom element. If the specified index is out of range, return `null`.

  The parameters stack is used to store `CallMethodRule` parameters. See `params`.

  Parameters:
    `n` - Index of the desired element, where 0 is the top of the stack, 1 is the next element down, and so on.
  Returns:
    the n'th object down the parameters stack

### popParams

    public Object[] popParams()

  Pop the top object off of the parameters stack, and return it. If there are no objects on the stack, return `null`.

  The parameters stack is used to store `CallMethodRule` parameters. See `params`.

  Returns:
    the top object popped off of the parameters stack

### pushParams

    public void pushParams(Object... object)

  Push a new object onto the top of the parameters stack.

  The parameters stack is used to store `CallMethodRule` parameters. See `params`.

  Parameters:
    `object` - The new object

### createSAXException

    public SAXException createSAXException(String message,
                                           Exception e)

  Create a SAX exception which also understands about the location in the digester file where the exception occurs

  Parameters:
    `message` - the custom SAX exception message
    `e` - the exception cause
  Returns:
    the new SAX exception

### createSAXException

    public SAXException createSAXException(Exception e)

  Create a SAX exception which also understands about the location in the digester file where the exception occurs

  Parameters:
    `e` - the exception cause
  Returns:
    the new SAX exception

### createSAXException

    public SAXException createSAXException(String message)

  Create a SAX exception which also understands about the location in the digester file where the exception occurs

  Parameters:
    `message` - the custom SAX exception message
  Returns:
    the new SAX exception

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