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## org.mule.expression
Class MessageHeaderExpressionEvaluator

    java.lang.Object
      org.mule.expression.MessageHeaderExpressionEvaluator

All Implemented Interfaces:
  ExpressionEvaluator, NamedObject, ExpressionConstants

Direct Known Subclasses:
  CorrelationPropertiesExpressionEvaluator

    public class MessageHeaderExpressionEvaluator

extends Object
implements ExpressionEvaluator, ExpressionConstants

Looks up the property on the message using the property name given. If the call on the messgae returns null, parameters on the inbound endpoint will also be checked.

See Also:
  `MessageHeadersListExpressionEvaluator`, `MessageHeadersExpressionEvaluator`, `ExpressionEvaluator`, `DefaultExpressionManager`

Field Summary
`static String` | `NAME`

Fields inherited from interface org.mule.expression.ExpressionConstants
`ALL_ARGUMENT, DELIM, OPTIONAL_ARGUMENT`

Constructor Summary
`MessageHeaderExpressionEvaluator()`

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

Constructor Detail

### MessageHeaderExpressionEvaluator

    public MessageHeaderExpressionEvaluator()

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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