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## org.apache.commons.configuration
Class AbstractHierarchicalFileConfiguration

    java.lang.Object
      org.apache.commons.configuration.event.EventSource
          org.apache.commons.configuration.AbstractConfiguration
              org.apache.commons.configuration.HierarchicalConfiguration
                  org.apache.commons.configuration.AbstractHierarchicalFileConfiguration

All Implemented Interfaces:
  Serializable, Cloneable, Configuration, ConfigurationErrorListener, ConfigurationListener, FileConfiguration, FileSystemBased, Reloadable

Direct Known Subclasses:
  HierarchicalINIConfiguration, MultiFileHierarchicalConfiguration, PatternSubtreeConfigurationWrapper, PropertyListConfiguration, XMLConfiguration, XMLPropertyListConfiguration

    public abstract class AbstractHierarchicalFileConfiguration

extends HierarchicalConfiguration
implements FileConfiguration, ConfigurationListener, ConfigurationErrorListener, FileSystemBased, Reloadable

Base class for implementing file based hierarchical configurations.

This class serves an analogous purpose as the `AbstractFileConfiguration` class for non hierarchical configurations. It behaves in exactly the same way, so please refer to the documentation of `AbstractFileConfiguration` for further details.

Since:
  1.2
Version:
  $Id: AbstractHierarchicalFileConfiguration.java 1206575 2011-11-26 20:07:52Z oheger $
Author:
  Emmanuel Bourg
See Also:
  Serialized Form

Nested Class Summary
`protected class` | `AbstractHierarchicalFileConfiguration.FileConfigurationDelegate` A special implementation of the `FileConfiguration` interface that is used internally to implement the `FileConfiguration` methods for hierarchical configurations.

Nested classes/interfaces inherited from class org.apache.commons.configuration.HierarchicalConfiguration
`HierarchicalConfiguration.BuilderVisitor, HierarchicalConfiguration.Node, HierarchicalConfiguration.NodeVisitor`

Field Summary

Fields inherited from class org.apache.commons.configuration.HierarchicalConfiguration
`EVENT_ADD_NODES, EVENT_CLEAR_TREE, EVENT_SUBNODE_CHANGED`

Fields inherited from class org.apache.commons.configuration.AbstractConfiguration
`END_TOKEN, EVENT_ADD_PROPERTY, EVENT_CLEAR, EVENT_CLEAR_PROPERTY, EVENT_READ_PROPERTY, EVENT_SET_PROPERTY, START_TOKEN`

Constructor Summary
`protected` | `AbstractHierarchicalFileConfiguration()` Creates a new instance of `AbstractHierarchicalFileConfiguration`.
`` | `AbstractHierarchicalFileConfiguration(File file)` Creates and loads the configuration from the specified file.
`protected` | `AbstractHierarchicalFileConfiguration(HierarchicalConfiguration c)` Creates a new instance of `AbstractHierarchicalFileConfiguration` and copies the content of the specified configuration into this object.
`` | `AbstractHierarchicalFileConfiguration(String fileName)` Creates and loads the configuration from the specified file.
`` | `AbstractHierarchicalFileConfiguration(URL url)` Creates and loads the configuration from the specified URL.

Method Summary
`void` | `addNodes(String key, Collection<? extends ConfigurationNode> nodes)` Directly adds sub nodes to this configuration.
`protected void` | `addPropertyDirect(String key, Object obj)` Adds the property with the specified key.
`void` | `clearProperty(String key)` Removes the property with the given key.
`void` | `clearTree(String key)` Removes all values of the property with the given name and of keys that start with this name.
`void` | `configurationChanged(ConfigurationEvent event)` Reacts on configuration change events triggered by the delegate.
`void` | `configurationError(ConfigurationErrorEvent event)` Notifies this listener that in an observed configuration an error occurred.
`boolean` | `containsKey(String key)` Checks if the specified key is contained in this configuration.
`protected AbstractHierarchicalFileConfiguration.FileConfigurationDelegate` | `createDelegate()` Creates the file configuration delegate, i.e. the object that implements functionality required by the `FileConfiguration` interface.
`protected List<ConfigurationNode>` | `fetchNodeList(String key)` Fetches a list of nodes, which are selected by the specified key.
`String` | `getBasePath()` Returns the base path.
`protected AbstractHierarchicalFileConfiguration.FileConfigurationDelegate` | `getDelegate()` Returns the file configuration delegate.
`String` | `getEncoding()` Return the encoding used to store the configuration file.
`File` | `getFile()` Return the file where the configuration is stored.
`String` | `getFileName()` Return the name of the file.
`FileSystem` | `getFileSystem()` Retrieve the FileSystem being used.
`Iterator<String>` | `getKeys()` Returns an iterator with all keys defined in this configuration.
`Iterator<String>` | `getKeys(String prefix)` Returns an iterator with all keys defined in this configuration that start with the given prefix.
`Object` | `getProperty(String key)` Fetches the specified property.
`ReloadingStrategy` | `getReloadingStrategy()` Return the reloading strategy.
`Object` | `getReloadLock()` Returns the object to synchronize on a reload.
`URL` | `getURL()` Return the URL where the configuration is stored.
`boolean` | `isAutoSave()` Tells if properties are automatically saved to the disk.
`boolean` | `isEmpty()` Checks if this configuration is empty.
`void` | `load()` Load the configuration from the underlying URL.
`void` | `load(File file)` Load the configuration from the specified file.
`void` | `load(InputStream in)` Load the configuration from the specified stream, using the encoding returned by `FileConfiguration.getEncoding()`.
`void` | `load(InputStream in, String encoding)` Load the configuration from the specified stream, using the specified encoding.
`void` | `load(String fileName)` Locate the specified file and load the configuration.
`void` | `load(URL url)` Load the configuration from the specified URL.
`void` | `refresh()` Reloads the associated configuration file.
`void` | `reload()` Reload the configuration.
`void` | `resetFileSystem()` Reset the FileSystem to the default;
`void` | `save()` Save the configuration.
`void` | `save(File file)` Save the configuration to the specified file.
`void` | `save(OutputStream out)` Save the configuration to the specified stream, using the encoding returned by `FileConfiguration.getEncoding()`.
`void` | `save(OutputStream out, String encoding)` Save the configuration to the specified stream, using the specified encoding.
`void` | `save(String fileName)` Save the configuration to the specified file.
`void` | `save(URL url)` Save the configuration to the specified URL.
`void` | `setAutoSave(boolean autoSave)` Enable or disable the automatically saving of modified properties to the disk.
`void` | `setBasePath(String basePath)` Sets the base path.
`protected void` | `setDelegate(AbstractHierarchicalFileConfiguration.FileConfigurationDelegate delegate)` Allows to set the file configuration delegate.
`void` | `setEncoding(String encoding)` Set the encoding used to store the configuration file.
`void` | `setFile(File file)` Set the file where the configuration is stored.
`void` | `setFileName(String fileName)` Set the name of the file.
`void` | `setFileSystem(FileSystem fileSystem)` Set the FileSystem to be used for this Configuration.
`void` | `setProperty(String key, Object value)` Sets the value of the specified property.
`void` | `setReloadingStrategy(ReloadingStrategy strategy)` Set the reloading strategy.
`void` | `setURL(URL url)` The URL where the configuration is stored.
`protected void` | `subnodeConfigurationChanged(ConfigurationEvent event)` Reacts on changes of an associated subnode configuration.

Methods inherited from class org.apache.commons.configuration.HierarchicalConfiguration
`clear, clearNode, clearNode, clearReferences, clone, configurationAt, configurationAt, configurationsAt, createAddPath, createNode, createSubnodeConfiguration, createSubnodeConfiguration, fetchAddNode, findLastPathNode, findPropertyNodes, getDefaultExpressionEngine, getExpressionEngine, getMaxIndex, getRoot, getRootNode, interpolatedConfiguration, nodeDefined, nodeDefined, removeNode, removeNode, setDefaultExpressionEngine, setExpressionEngine, setRoot, setRootNode, subset`

Methods inherited from class org.apache.commons.configuration.AbstractConfiguration
`addErrorLogListener, addProperty, append, clearPropertyDirect, copy, createInterpolator, getBigDecimal, getBigDecimal, getBigInteger, getBigInteger, getBoolean, getBoolean, getBoolean, getByte, getByte, getByte, getDefaultListDelimiter, getDelimiter, getDouble, getDouble, getDouble, getFloat, getFloat, getFloat, getInt, getInt, getInteger, getInterpolator, getList, getList, getListDelimiter, getLogger, getLong, getLong, getLong, getProperties, getProperties, getShort, getShort, getShort, getString, getString, getStringArray, getSubstitutor, interpolate, interpolate, interpolateHelper, isDelimiterParsingDisabled, isScalarValue, isThrowExceptionOnMissing, resolveContainerStore, setDefaultListDelimiter, setDelimiter, setDelimiterParsingDisabled, setListDelimiter, setLogger, setThrowExceptionOnMissing`

Methods inherited from class org.apache.commons.configuration.event.EventSource
`addConfigurationListener, addErrorListener, clearConfigurationListeners, clearErrorListeners, createErrorEvent, createEvent, fireError, fireEvent, getConfigurationListeners, getErrorListeners, isDetailEvents, removeConfigurationListener, removeErrorListener, setDetailEvents`

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

Methods inherited from interface org.apache.commons.configuration.FileConfiguration
`load, save`

Methods inherited from interface org.apache.commons.configuration.Configuration
`addProperty, clear, getBigDecimal, getBigDecimal, getBigInteger, getBigInteger, getBoolean, getBoolean, getBoolean, getByte, getByte, getByte, getDouble, getDouble, getDouble, getFloat, getFloat, getFloat, getInt, getInt, getInteger, getList, getList, getLong, getLong, getLong, getProperties, getShort, getShort, getShort, getString, getString, getStringArray, subset`

Constructor Detail

### AbstractHierarchicalFileConfiguration

    protected AbstractHierarchicalFileConfiguration()

  Creates a new instance of `AbstractHierarchicalFileConfiguration`.

### AbstractHierarchicalFileConfiguration

    protected AbstractHierarchicalFileConfiguration(HierarchicalConfiguration c)

  Creates a new instance of `AbstractHierarchicalFileConfiguration` and copies the content of the specified configuration into this object.

  Parameters:
    `c` - the configuration to copy
  Since:
    1.4

### AbstractHierarchicalFileConfiguration

    public AbstractHierarchicalFileConfiguration(String fileName)
                                          throws ConfigurationException

  Creates and loads the configuration from the specified file.

  Parameters:
    `fileName` - The name of the plist file to load.
  Throws:
    `ConfigurationException` - Error while loading the file

### AbstractHierarchicalFileConfiguration

    public AbstractHierarchicalFileConfiguration(File file)
                                          throws ConfigurationException

  Creates and loads the configuration from the specified file.

  Parameters:
    `file` - The configuration file to load.
  Throws:
    `ConfigurationException` - Error while loading the file

### AbstractHierarchicalFileConfiguration

    public AbstractHierarchicalFileConfiguration(URL url)
                                          throws ConfigurationException

  Creates and loads the configuration from the specified URL.

  Parameters:
    `url` - The location of the configuration file to load.
  Throws:
    `ConfigurationException` - Error while loading the file

Method Detail

### addPropertyDirect

    protected void addPropertyDirect(String key,
                                     Object obj)

  Description copied from class: `HierarchicalConfiguration`
  Adds the property with the specified key. This task will be delegated to the associated `ExpressionEngine`, so the passed in key must match the requirements of this implementation.

  Overrides:
    `addPropertyDirect` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key of the new property
    `obj` - the value of the new property

### clearProperty

    public void clearProperty(String key)

  Description copied from class: `HierarchicalConfiguration`
  Removes the property with the given key. Properties with names that start with the given key (i.e. properties below the specified key in the hierarchy) won't be affected.

  Specified by:
    `clearProperty` in interface `Configuration`
  Overrides:
    `clearProperty` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key of the property to be removed

### clearTree

    public void clearTree(String key)

  Description copied from class: `HierarchicalConfiguration`
  Removes all values of the property with the given name and of keys that start with this name. So if there is a property with the key "foo" and a property with the key "foo.bar", a call of `clearTree("foo")` would remove both properties.

  Overrides:
    `clearTree` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key of the property to be removed

### setProperty

    public void setProperty(String key,
                            Object value)

  Description copied from class: `HierarchicalConfiguration`
  Sets the value of the specified property.

  Specified by:
    `setProperty` in interface `Configuration`
  Overrides:
    `setProperty` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key of the property to set
    `value` - the new value of this property

### load

    public void load()
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Load the configuration from the underlying URL. If the URL is not specified, it attempts to locate the specified file name.

  Specified by:
    `load` in interface `FileConfiguration`
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### load

    public void load(String fileName)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Locate the specified file and load the configuration.

  Specified by:
    `load` in interface `FileConfiguration`
  Parameters:
    `fileName` - the name of the file loaded
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### load

    public void load(File file)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Load the configuration from the specified file.

  Specified by:
    `load` in interface `FileConfiguration`
  Parameters:
    `file` - the loaded file
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### load

    public void load(URL url)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Load the configuration from the specified URL.

  Specified by:
    `load` in interface `FileConfiguration`
  Parameters:
    `url` - the URL of the file loaded
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### load

    public void load(InputStream in)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Load the configuration from the specified stream, using the encoding returned by `FileConfiguration.getEncoding()`.

  Specified by:
    `load` in interface `FileConfiguration`
  Parameters:
    `in` - the input stream
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### load

    public void load(InputStream in,
                     String encoding)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Load the configuration from the specified stream, using the specified encoding. If the encoding is null the default encoding is used.

  Specified by:
    `load` in interface `FileConfiguration`
  Parameters:
    `in` - the input stream
    `encoding` - the encoding used. `null` to use the default encoding
  Throws:
    `ConfigurationException` - if an error occurs during the load operation

### save

    public void save()
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration.

  Specified by:
    `save` in interface `FileConfiguration`
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### save

    public void save(String fileName)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration to the specified file.

  Specified by:
    `save` in interface `FileConfiguration`
  Parameters:
    `fileName` - the name of the file to be saved
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### save

    public void save(File file)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration to the specified file.

  Specified by:
    `save` in interface `FileConfiguration`
  Parameters:
    `file` - specifies the file to be saved
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### save

    public void save(URL url)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration to the specified URL.

  Specified by:
    `save` in interface `FileConfiguration`
  Parameters:
    `url` - the URL
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### save

    public void save(OutputStream out)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration to the specified stream, using the encoding returned by `FileConfiguration.getEncoding()`.

  Specified by:
    `save` in interface `FileConfiguration`
  Parameters:
    `out` - the output stream
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### save

    public void save(OutputStream out,
                     String encoding)
              throws ConfigurationException

  Description copied from interface: `FileConfiguration`
  Save the configuration to the specified stream, using the specified encoding. If the encoding is null the default encoding is used.

  Specified by:
    `save` in interface `FileConfiguration`
  Parameters:
    `out` - the output stream
    `encoding` - the encoding to be used
  Throws:
    `ConfigurationException` - if an error occurs during the save operation

### getFileName

    public String getFileName()

  Description copied from interface: `FileConfiguration`
  Return the name of the file.

  Specified by:
    `getFileName` in interface `FileConfiguration`
  Returns:
    the file name

### setFileName

    public void setFileName(String fileName)

  Description copied from interface: `FileConfiguration`
  Set the name of the file.

  Specified by:
    `setFileName` in interface `FileConfiguration`
  Parameters:
    `fileName` - the name of the file

### getBasePath

    public String getBasePath()

  Description copied from interface: `FileConfiguration`
  Returns the base path. One way to specify the location of a configuration source is by setting its base path and its file name. This method returns this base path. The concrete value returned by this method depends on the way the location of the configuration file was set. If methods like `setFile()` or `setURL()` were used, the base path typically points to the parent directory of the configuration file (e.g. for the URL `file:/temp/test.properties` the base path will be `file:/temp/`). If the base path was explicitly set using `setBasePath()`, this method will return the exact value specified here without further modifications.

  Specified by:
    `getBasePath` in interface `FileConfiguration`
  Returns:
    the base path
  See Also:
    `AbstractFileConfiguration.setBasePath(String)`

### setBasePath

    public void setBasePath(String basePath)

  Description copied from interface: `FileConfiguration`
  Sets the base path. The methods `setBasePath()` and `setFileName()` can be used together to specify the location of the configuration file to be loaded. If relative file names are to be resolved (e.g. for the include files supported by `PropertiesConfiguration`), this base path will be used.

  Specified by:
    `setBasePath` in interface `FileConfiguration`
  Parameters:
    `basePath` - the base path.

### getFile

    public File getFile()

  Description copied from interface: `FileConfiguration`
  Return the file where the configuration is stored.

  Specified by:
    `getFile` in interface `FileConfiguration`
  Returns:
    the configuration file

### setFile

    public void setFile(File file)

  Description copied from interface: `FileConfiguration`
  Set the file where the configuration is stored.

  Specified by:
    `setFile` in interface `FileConfiguration`
  Parameters:
    `file` - the file

### getURL

    public URL getURL()

  Description copied from interface: `FileConfiguration`
  Return the URL where the configuration is stored.

  Specified by:
    `getURL` in interface `FileConfiguration`
  Returns:
    the URL of the configuration

### setURL

    public void setURL(URL url)

  Description copied from interface: `FileConfiguration`
  The URL where the configuration is stored.

  Specified by:
    `setURL` in interface `FileConfiguration`
  Parameters:
    `url` - the URL

### setAutoSave

    public void setAutoSave(boolean autoSave)

  Description copied from interface: `FileConfiguration`
  Enable or disable the automatically saving of modified properties to the disk.

  Specified by:
    `setAutoSave` in interface `FileConfiguration`
  Parameters:
    `autoSave` - `true` to enable, `false` to disable

### isAutoSave

    public boolean isAutoSave()

  Description copied from interface: `FileConfiguration`
  Tells if properties are automatically saved to the disk.

  Specified by:
    `isAutoSave` in interface `FileConfiguration`
  Returns:
    `true` if auto-saving is enabled, `false` otherwise

### getReloadingStrategy

    public ReloadingStrategy getReloadingStrategy()

  Description copied from interface: `FileConfiguration`
  Return the reloading strategy.

  Specified by:
    `getReloadingStrategy` in interface `FileConfiguration`
  Returns:
    the reloading strategy currently used

### setReloadingStrategy

    public void setReloadingStrategy(ReloadingStrategy strategy)

  Description copied from interface: `FileConfiguration`
  Set the reloading strategy.

  Specified by:
    `setReloadingStrategy` in interface `FileConfiguration`
  Parameters:
    `strategy` - the reloading strategy to use

### reload

    public void reload()

  Description copied from interface: `FileConfiguration`
  Reload the configuration.

  Specified by:
    `reload` in interface `FileConfiguration`

### refresh

    public void refresh()
                 throws ConfigurationException

  Reloads the associated configuration file. This method first clears the content of this configuration, then the associated configuration file is loaded again. Updates on this configuration which have not yet been saved are lost. Calling this method is like invoking `reload()` without checking the reloading strategy.

  Throws:
    `ConfigurationException` - if an error occurs
  Since:
    1.7

### getEncoding

    public String getEncoding()

  Description copied from interface: `FileConfiguration`
  Return the encoding used to store the configuration file. If the value is null the default encoding is used.

  Specified by:
    `getEncoding` in interface `FileConfiguration`
  Returns:
    the current encoding

### setEncoding

    public void setEncoding(String encoding)

  Description copied from interface: `FileConfiguration`
  Set the encoding used to store the configuration file. Set the encoding to null to use the default encoding.

  Specified by:
    `setEncoding` in interface `FileConfiguration`
  Parameters:
    `encoding` - the encoding to use

### getReloadLock

    public Object getReloadLock()

  Description copied from class: `HierarchicalConfiguration`
  Returns the object to synchronize on a reload. This class is not reloadable so this object isn't important

  Specified by:
    `getReloadLock` in interface `Reloadable`
  Overrides:
    `getReloadLock` in class `HierarchicalConfiguration`
  Returns:
    the lock object

### containsKey

    public boolean containsKey(String key)

  Description copied from class: `HierarchicalConfiguration`
  Checks if the specified key is contained in this configuration. Note that for this configuration the term "contained" means that the key has an associated value. If there is a node for this key that has no value but children (either defined or undefined), this method will still return false .

  Specified by:
    `containsKey` in interface `Configuration`
  Overrides:
    `containsKey` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key to be chekced
  Returns:
    a flag if this key is contained in this configuration

### getKeys

    public Iterator<String> getKeys()

  Description copied from class: `HierarchicalConfiguration`
  Returns an iterator with all keys defined in this configuration. Note that the keys returned by this method will not contain any indices. This means that some structure will be lost.

  Specified by:
    `getKeys` in interface `Configuration`
  Overrides:
    `getKeys` in class `HierarchicalConfiguration`
  Returns:
    an iterator with the defined keys in this configuration

### getKeys

    public Iterator<String> getKeys(String prefix)

  Description copied from class: `HierarchicalConfiguration`
  Returns an iterator with all keys defined in this configuration that start with the given prefix. The returned keys will not contain any indices. This implementation tries to locate a node whose key is the same as the passed in prefix. Then the subtree of this node is traversed, and the keys of all nodes encountered (including attributes) are added to the result set.

  Specified by:
    `getKeys` in interface `Configuration`
  Overrides:
    `getKeys` in class `HierarchicalConfiguration`
  Parameters:
    `prefix` - the prefix of the keys to start with
  Returns:
    an iterator with the found keys
  See Also:
    `Configuration.getKeys()`

### getProperty

    public Object getProperty(String key)

  Description copied from class: `HierarchicalConfiguration`
  Fetches the specified property. This task is delegated to the associated expression engine.

  Specified by:
    `getProperty` in interface `Configuration`
  Overrides:
    `getProperty` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key to be looked up
  Returns:
    the found value

### isEmpty

    public boolean isEmpty()

  Description copied from class: `HierarchicalConfiguration`
  Checks if this configuration is empty. Empty means that there are no keys with any values, though there can be some (empty) nodes.

  Specified by:
    `isEmpty` in interface `Configuration`
  Overrides:
    `isEmpty` in class `HierarchicalConfiguration`
  Returns:
    a flag if this configuration is empty

### addNodes

    public void addNodes(String key,
                         Collection<? extends ConfigurationNode> nodes)

  Directly adds sub nodes to this configuration. This implementation checks whether auto save is necessary after executing the operation.

  Overrides:
    `addNodes` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key where the nodes are to be added
    `nodes` - a collection with the nodes to be added
  Since:
    1.5

### fetchNodeList

    protected List<ConfigurationNode> fetchNodeList(String key)

  Fetches a list of nodes, which are selected by the specified key. This implementation will perform a reload if necessary.

  Overrides:
    `fetchNodeList` in class `HierarchicalConfiguration`
  Parameters:
    `key` - the key
  Returns:
    a list with the selected nodes

### subnodeConfigurationChanged

    protected void subnodeConfigurationChanged(ConfigurationEvent event)

  Reacts on changes of an associated subnode configuration. If the auto save mechanism is active, the configuration must be saved.

  Overrides:
    `subnodeConfigurationChanged` in class `HierarchicalConfiguration`
  Parameters:
    `event` - the event describing the change
  Since:
    1.5

### createDelegate

    protected AbstractHierarchicalFileConfiguration.FileConfigurationDelegate createDelegate()

  Creates the file configuration delegate, i.e. the object that implements functionality required by the `FileConfiguration` interface. This base implementation will return an instance of the `FileConfigurationDelegate` class. Derived classes may override it to create a different delegate object.

  Returns:
    the file configuration delegate

### configurationChanged

    public void configurationChanged(ConfigurationEvent event)

  Reacts on configuration change events triggered by the delegate. These events are passed to the registered configuration listeners.

  Specified by:
    `configurationChanged` in interface `ConfigurationListener`
  Parameters:
    `event` - the triggered event
  Since:
    1.3

### configurationError

    public void configurationError(ConfigurationErrorEvent event)

  Description copied from interface: `ConfigurationErrorListener`
  Notifies this listener that in an observed configuration an error occurred. All information available about this error, including the causing `Throwable` object, can be obtained from the passed in event object.

  Specified by:
    `configurationError` in interface `ConfigurationErrorListener`
  Parameters:
    `event` - the event object with information about the error

### getDelegate

    protected AbstractHierarchicalFileConfiguration.FileConfigurationDelegate getDelegate()

  Returns the file configuration delegate.

  Returns:
    the delegate

### setDelegate

    protected void setDelegate(AbstractHierarchicalFileConfiguration.FileConfigurationDelegate delegate)

  Allows to set the file configuration delegate.

  Parameters:
    `delegate` - the new delegate

### setFileSystem

    public void setFileSystem(FileSystem fileSystem)

  Set the FileSystem to be used for this Configuration.

  Specified by:
    `setFileSystem` in interface `FileSystemBased`
  Parameters:
    `fileSystem` - The FileSystem to use.

### resetFileSystem

    public void resetFileSystem()

  Reset the FileSystem to the default;

  Specified by:
    `resetFileSystem` in interface `FileSystemBased`

### getFileSystem

    public FileSystem getFileSystem()

  Retrieve the FileSystem being used.

  Specified by:
    `getFileSystem` in interface `FileSystemBased`
  Returns:
    The FileSystem.

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