MessagePayloadExpressionEvaluator (Mule ESB 2.2.1 API)
Keywords: org.mule.expression.MessagePayloadExpressionEvaluator class

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## org.mule.expression
Class MessagePayloadExpressionEvaluator

    java.lang.Object
      org.mule.expression.MessagePayloadExpressionEvaluator

All Implemented Interfaces:
  ExpressionEvaluator, NamedObject

    public class MessagePayloadExpressionEvaluator

extends Object
implements ExpressionEvaluator

Returns the message payload. If the expression is set to a class name then Mule will attempt to transform the payload by discovering the correct transformer(s) in the registry. This is only suited for simple transformations between common types.

`#[payload:byte[]]`

or

`#[payload:org.mule.api.OutputHandler]`

If the object passed in is not a MuleMessage, the same object will be returned.

See Also:
  `ExpressionEvaluator`, `DefaultExpressionManager`

Field Summary
`static String` | `BYTE_ARRAY`
`protected Log` | `logger` logger used by this class
`static String` | `NAME`

Constructor Summary
`MessagePayloadExpressionEvaluator()`

Method Summary
`Object` | `evaluate(String expression, MuleMessage message)` Extracts a single property from the message
`String` | `getName()` Gets the name of the object
`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`

Field Detail

### NAME

    public static final String NAME

See Also:
  Constant Field Values

### BYTE_ARRAY

    public static final String BYTE_ARRAY

See Also:
  Constant Field Values

### logger

    protected final transient Log logger

  logger used by this class

Constructor Detail

### MessagePayloadExpressionEvaluator

    public MessagePayloadExpressionEvaluator()

Method Detail

### evaluate

    public Object evaluate(String expression,
                           MuleMessage message)

  Description copied from interface: `ExpressionEvaluator`
  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

### getName

    public String getName()

  Gets the name of the object

  Specified by:
    `getName` in interface `NamedObject`
  Returns:
    the name of the object

### 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

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