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## org.apache.commons.jexl2.scripting
Class JexlScriptEngine

    java.lang.Object
      javax.script.AbstractScriptEngine
          org.apache.commons.jexl2.scripting.JexlScriptEngine

All Implemented Interfaces:
  Compilable, ScriptEngine

    public class JexlScriptEngine

extends AbstractScriptEngine
implements Compilable

Implements the Jexl ScriptEngine for JSF-223.

This implementation gives access to both ENGINE_SCOPE and GLOBAL_SCOPE bindings. When a JEXL script accesses a variable for read or write, this implementation checks first ENGINE and then GLOBAL scope. The first one found is used. If no variable is found, and the JEXL script is writing to a variable, it will be stored in the ENGINE scope.

The implementation also creates the "JEXL" script object as an instance of the class `JexlScriptEngine.JexlScriptObject` for access to utility methods and variables.

See Java Scripting API Javadoc.

Since:
  2.0

Nested Class Summary
`class` | `JexlScriptEngine.JexlScriptObject` Implements engine and engine context properties for use by JEXL scripts.

Field Summary
`static String` | `CONTEXT_KEY` Reserved key for context (mandated by JSR-223).
`static String` | `JEXL_OBJECT_KEY` Reserved key for JexlScriptObject.

Fields inherited from class javax.script.AbstractScriptEngine
`context`

Fields inherited from interface javax.script.ScriptEngine
`ARGV, ENGINE, ENGINE_VERSION, FILENAME, LANGUAGE, LANGUAGE_VERSION, NAME`

Constructor Summary
`JexlScriptEngine()` Default constructor.
`JexlScriptEngine(ScriptEngineFactory factory)` Create a scripting engine using the supplied factory.

Method Summary
`CompiledScript` | `compile(Reader script)`
`CompiledScript` | `compile(String script)`
`Bindings` | `createBindings()`
`Object` | `eval(Reader reader, ScriptContext context)`
`Object` | `eval(String script, ScriptContext context)`
`ScriptEngineFactory` | `getFactory()`

Methods inherited from class javax.script.AbstractScriptEngine
`eval, eval, eval, eval, get, getBindings, getContext, getScriptContext, put, setBindings, setContext`

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

Field Detail

### CONTEXT_KEY

    public static final String CONTEXT_KEY

  Reserved key for context (mandated by JSR-223).

  See Also:
    Constant Field Values

### JEXL_OBJECT_KEY

    public static final String JEXL_OBJECT_KEY

  Reserved key for JexlScriptObject.

  See Also:
    Constant Field Values

Constructor Detail

### JexlScriptEngine

    public JexlScriptEngine()

  Default constructor.

  Only intended for use when not using a factory. Sets the factory to `JexlScriptEngineFactory`.

### JexlScriptEngine

    public JexlScriptEngine(ScriptEngineFactory factory)

  Create a scripting engine using the supplied factory.

  Parameters:
    `factory` - the factory which created this instance.
  Throws:
    `NullPointerException` - if factory is null

Method Detail

### createBindings

    public Bindings createBindings()

  Specified by:
    `createBindings` in interface `ScriptEngine`

### eval

    public Object eval(Reader reader,
                       ScriptContext context)
                throws ScriptException

  Specified by:
    `eval` in interface `ScriptEngine`
  Throws:
    `ScriptException`

### eval

    public Object eval(String script,
                       ScriptContext context)
                throws ScriptException

  Specified by:
    `eval` in interface `ScriptEngine`
  Throws:
    `ScriptException`

### getFactory

    public ScriptEngineFactory getFactory()

  Specified by:
    `getFactory` in interface `ScriptEngine`

### compile

    public CompiledScript compile(String script)
                           throws ScriptException

  Specified by:
    `compile` in interface `Compilable`
  Throws:
    `ScriptException`

### compile

    public CompiledScript compile(Reader script)
                           throws ScriptException

  Specified by:
    `compile` in interface `Compilable`
  Throws:
    `ScriptException`

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