org.springframework.integration.xml.transformer

Class XPathTransformer

java.lang.Object

org.springframework.integration.context.IntegrationObjectSupport

org.springframework.integration.transformer.AbstractTransformer

org.springframework.integration.xml.transformer.XPathTransformer

All Implemented Interfaces:

Aware, BeanFactoryAware, BeanNameAware, InitializingBean, ApplicationContextAware, ExpressionCapable, NamedComponent, GenericTransformer<Message<?>,Message<?>>, Transformer

public class XPathTransformer
extends AbstractTransformer

Transformer implementation that evaluates an XPath expression against the inbound Message payload and returns a Message whose payload is the result of that evaluation. Prior to evaluation, the payload may be converted by the configured XmlPayloadConverter instance. The default converter type is DefaultXmlPayloadConverter.

The evaluation result type will depend on either the enumeration value provided to setEvaluationType(XPathEvaluationType) or the presence of a NodeMapper, which takes precedence. If no NodeMapper or evaluation type is configured explicitly, the default evaluation type is XPathEvaluationType.STRING_RESULT.

Since:

2.0

Author:

Mark Fisher

Field Summary

Fields inherited from class org.springframework.integration.context.IntegrationObjectSupport

EXPRESSION_PARSER, logger

Constructor Summary

Constructors

Constructor and Description
XPathTransformer(String expression) Create an XPathTransformer that will create an XPath expression from the given String to be evaluated against converted inbound Message payloads.
XPathTransformer(XPathExpression expression) Create an XPathTransformer that will evaluate the given XPathExpression against converted inbound Message payloads.

Method Summary

Modifier and Type	Method and Description
protected Object	doTransform(Message<?> message) Subclasses must implement this method to provide the transformation logic.
String	getComponentType() Subclasses may implement this method to provide component type information.
void	setConverter(XmlPayloadConverter converter) Specify the XmlPayloadConverter to use when converting a Message payload prior to XPath evaluation.
void	setEvaluationType(XPathEvaluationType evaluationType) Specify the expected XPathEvaluationType.
void	setNodeMapper(NodeMapper<?> nodeMapper) Set a NodeMapper to use for generating the result object.

Methods inherited from class org.springframework.integration.transformer.AbstractTransformer

transform

Methods inherited from class org.springframework.integration.context.IntegrationObjectSupport

afterPropertiesSet, extractTypeIfPossible, generateId, getApplicationContext, getApplicationContextId, getBeanDescription, getBeanFactory, getBeanName, getChannelResolver, getComponentName, getConversionService, getExpression, getIntegrationProperties, getIntegrationProperty, getMessageBuilderFactory, getTaskScheduler, isInitialized, onInit, setApplicationContext, setBeanFactory, setBeanName, setChannelResolver, setComponentName, setConversionService, setMessageBuilderFactory, setPrimaryExpression, setTaskScheduler, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

XPathTransformer

public XPathTransformer(String expression)

Create an XPathTransformer that will create an XPath expression from the given String to be evaluated against converted inbound Message payloads.

Parameters:

expression - The expression.

XPathTransformer

public XPathTransformer(XPathExpression expression)

Create an XPathTransformer that will evaluate the given XPathExpression against converted inbound Message payloads.

Parameters:

expression - The expression.

Method Detail

setEvaluationType

public void setEvaluationType(XPathEvaluationType evaluationType)

Specify the expected XPathEvaluationType. The default is XPathEvaluationType.STRING_RESULT.

Parameters:

evaluationType - The evaluation type.

setNodeMapper

public void setNodeMapper(NodeMapper<?> nodeMapper)

Set a NodeMapper to use for generating the result object. By default the NodeMapper is null, but if explicitly set, type determination is the responsibility of the NodeMapper, taking precedence over any configured evaluationType.

Parameters:

nodeMapper - The node mapper.

setConverter

public void setConverter(XmlPayloadConverter converter)

Specify the XmlPayloadConverter to use when converting a Message payload prior to XPath evaluation.

Parameters:

converter - The payload converter.

getComponentType

public String getComponentType()

Description copied from class: IntegrationObjectSupport

Subclasses may implement this method to provide component type information.

Specified by:

getComponentType in interface NamedComponent

Overrides:

getComponentType in class IntegrationObjectSupport

doTransform

protected Object doTransform(Message<?> message)

Description copied from class: AbstractTransformer

Subclasses must implement this method to provide the transformation logic. If the return value is itself a Message, it will be used as the result. Otherwise, any non-null return value will be used as the payload of the result Message.

Specified by:

doTransform in class AbstractTransformer

Parameters:

message - The message.

Returns:

The result of the transformation.