org.mule.util.expression

Class MessageExpressionEvaluator

java.lang.Object

org.mule.util.expression.MessageExpressionEvaluator

All Implemented Interfaces:

NamedObject, ExpressionEvaluator

public class MessageExpressionEvaluator
extends Object
implements ExpressionEvaluator

Returns properties on the MuleMessage itself. The supported expressions map directly to methods on the message. For example:

• id - returns the value of MessageAdapter.getUniqueId()
• correlationId - returns the value of MessageAdapter.getCorrelationId()
• correlationGroupSize - returns the value of MessageAdapter.getCorrelationGroupSize()
• correlationSequence - returns the value of MessageAdapter.getCorrelationSequence()
• replyTo - returns the value of MessageAdapter.getReplyTo()
• payload - returns the value of MessageAdapter.getPayload()
• encoding - returns the value of MessageAdapter.getEncoding()
• exception - returns the value of org.mule.api.MuleMessage#getExceptionPayload().getException() or null if there is no exception payload

If no expression is set the MuleMessage itself will be returned.

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

See Also:

ExpressionEvaluator, ExpressionEvaluatorManager

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.commons.logging.Log	logger logger used by this class
static String	NAME

Constructor Summary

Constructors

Constructor and Description
MessageExpressionEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
Object	evaluate(String expression, Object message) Extracts a single property from the message
String	getName() Gts 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

logger

protected final transient org.apache.commons.logging.Log logger

logger used by this class

Constructor Detail

MessageExpressionEvaluator

public MessageExpressionEvaluator()

Method Detail

evaluate

public Object evaluate(String expression,
              Object 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()

Gts 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