org.mule.module.xml.expression

Class AbstractXPathExpressionEvaluator

java.lang.Object

org.mule.module.xml.expression.AbstractXPathExpressionEvaluator

All Implemented Interfaces:

Disposable, NamedObject, ExpressionEvaluator

Direct Known Subclasses:

BeanPayloadExpressionEvaluator, XPathExpressionEvaluator

public abstract class AbstractXPathExpressionEvaluator
extends Object
implements ExpressionEvaluator, Disposable

Provides a base class for XPath property extractors. The XPath engine used is jaxen (http://jaxen.org) which supports XPath queries on other object models such as JavaBeans as well as Xml

Field Summary

Fields inherited from interface org.mule.api.lifecycle.Disposable

PHASE_NAME

Constructor Summary

Constructors

Constructor and Description
AbstractXPathExpressionEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract org.jaxen.XPath	createXPath(String expression, Object object)
void	dispose() A lifecycle method where implementor should free up any resources.
Object	evaluate(String expression, Object message) Extracts a single property from the message
protected abstract Object	extractResultFromNode(Object result)
protected List	extractResultsFromNodes(List results)
protected org.jaxen.XPath	getXPath(String expression, Object 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

Methods inherited from interface org.mule.api.NamedObject

getName

Constructor Detail

AbstractXPathExpressionEvaluator

public AbstractXPathExpressionEvaluator()

Method Detail

evaluate

public Object evaluate(String expression,
              Object message)

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

setName

public final void setName(String name)

Sets the name of the object

Specified by:

setName in interface NamedObject

Parameters:

name - the name of the object

getXPath

protected org.jaxen.XPath getXPath(String expression,
                       Object object)
                            throws org.jaxen.JaxenException

Throws:

org.jaxen.JaxenException

createXPath

protected abstract org.jaxen.XPath createXPath(String expression,
                          Object object)
                                        throws org.jaxen.JaxenException

Throws:

org.jaxen.JaxenException

extractResultsFromNodes

protected List extractResultsFromNodes(List results)

dispose

public void dispose()

A lifecycle method where implementor should free up any resources. If an exception is thrown it should just be logged and processing should continue. This method should not throw Runtime exceptions.

Specified by:

dispose in interface Disposable

extractResultFromNode

protected abstract Object extractResultFromNode(Object result)