AbstractScriptExpressionEvaluator (Mule ESB 2.2.1 API)
Keywords: org.mule.module.scripting.expression.AbstractScriptExpressionEvaluator class

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## org.mule.module.scripting.expression
Class AbstractScriptExpressionEvaluator

    java.lang.Object
      org.mule.module.scripting.expression.AbstractScriptExpressionEvaluator

All Implemented Interfaces:
  ExpressionEvaluator, Disposable, NamedObject

Direct Known Subclasses:
  GroovyExpressionEvaluator

    public abstract class AbstractScriptExpressionEvaluator

extends Object
implements ExpressionEvaluator, Disposable

An abstract `ExpressionEvaluator` that can be used for any JSR-233 script engine. If a POJO is passed in it is accessible from the 'payload' namespace. If a `MuleMessage` instance is used then it is accessible from the message' namespace and the 'payload' namespace is also available.

Field Summary
`protected Map` | `cache`

Fields inherited from interface org.mule.api.lifecycle.Disposable
`PHASE_NAME`

Constructor Summary
`AbstractScriptExpressionEvaluator()`

Method Summary
`void` | `dispose()` A lifecycle method where implementor should free up any resources.
`Object` | `evaluate(String expression, MuleMessage message)` Extracts a single property from the message
`protected Scriptable` | `getScript(String expression)`
`void` | `setName(String name)` Sets the name of the object

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

Methods inherited from interface org.mule.api.NamedObject
`getName`

Field Detail

### cache

    protected Map cache

Constructor Detail

### AbstractScriptExpressionEvaluator

    public AbstractScriptExpressionEvaluator()

Method Detail

### evaluate

    public Object evaluate(String expression,
                           MuleMessage message)

  Extracts a single property from the message

  Specified by:
    `evaluate` in interface `ExpressionEvaluator`
  Parameters:
    `expression` - the property expression or expression
    `message` - the message to extract from
  Returns:
    the result of the extraction or null if the property was not found

### setName

    public void setName(String name)

  Sets the name of the object

  Specified by:
    `setName` in interface `NamedObject`
  Parameters:
    `name` - the name of the object

### getScript

    protected Scriptable getScript(String expression)

### dispose

    public void dispose()

  A lifecycle method where implementor should free up any resources. If an exception is thrown it should just be logged and processing should continue. This method should not throw Runtime exceptions.

  Specified by:
    `dispose` in interface `Disposable`

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