org.mule.expression
Class MessageHeaderExpressionEvaluator

java.lang.Object
  extended by org.mule.expression.MessageHeaderExpressionEvaluator
All Implemented Interfaces:
ExpressionEvaluator, NamedObject
Direct Known Subclasses:
CorrelationPropertiesExpressionEvaluator

public class MessageHeaderExpressionEvaluator
extends Object
implements ExpressionEvaluator

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
           
 
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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