org.mule.expression

Class MessageExpressionEvaluator

java.lang.Object

org.mule.expression.MessageExpressionEvaluator

All Implemented Interfaces:

ExpressionEvaluator, NamedObject

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 MuleMessage.getUniqueId()
• correlationId - returns the value of MuleMessage.getCorrelationId()
• correlationGroupSize - returns the value of MuleMessage.getCorrelationGroupSize()
• correlationSequence - returns the value of MuleMessage.getCorrelationSequence()
• replyTo - returns the value of MuleMessage.getReplyTo()
• payload - returns the value of MuleMessage.getPayload()
• encoding - returns the value of MuleMessage.getEncoding()
• exception - returns the value of 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, DefaultExpressionManager

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
MessageExpressionEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
Object	evaluate(String expression, MuleMessage message) Extracts a single property from the message
TypedValue	evaluateTyped(String expression, MuleMessage message) Extracts a single typed property from the message
String	getName() Gets 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

PAYLOAD

public static final String PAYLOAD

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,
              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

evaluateTyped

public TypedValue evaluateTyped(String expression,
                       MuleMessage message)

Description copied from interface: ExpressionEvaluator

Extracts a single typed property from the message

Specified by:

evaluateTyped in interface ExpressionEvaluator

Parameters:

expression - the property expression or expression

message - the message to extract from

Returns:

a no null data type for the extracted value

getName

public String getName()

Gets the name of the object

Specified by:

getName in interface NamedObject

Returns:

the name of the object