org.apache.camel.support

Class ExpressionAdapter

java.lang.Object

org.apache.camel.support.ExpressionSupport

org.apache.camel.support.ExpressionAdapter

All Implemented Interfaces:

Expression, Predicate

Direct Known Subclasses:

DirectVmConsumerExpression, ExpressionAdapter, TokenPairExpressionIterator, TokenXMLExpressionIterator, XMLTokenExpressionIterator

public abstract class ExpressionAdapter
extends ExpressionSupport

A helper class for developers wishing to implement an Expression using Java code with a minimum amount of code to write so that the developer only needs to implement one of the evaluate(org.apache.camel.Exchange, Class) or ExpressionSupport.evaluate(org.apache.camel.Exchange) methods.

Version:

Constructor Summary

Constructors

Constructor and Description
ExpressionAdapter()

Method Summary

Methods

Modifier and Type	Method and Description
protected String	assertionFailureMessage(Exchange exchange)
<T> T	evaluate(Exchange exchange, Class<T> type) Returns the value of the expression on the given exchange

Methods inherited from class org.apache.camel.support.ExpressionSupport

assertMatches, evaluate, matches

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionAdapter

public ExpressionAdapter()

Method Detail

assertionFailureMessage

protected String assertionFailureMessage(Exchange exchange)

Specified by:

assertionFailureMessage in class ExpressionSupport

evaluate

public <T> T evaluate(Exchange exchange,
             Class<T> type)

Description copied from interface: Expression

Returns the value of the expression on the given exchange

Parameters:

exchange - the message exchange on which to evaluate the expression

type - the expected type of the evaluation result

Returns:

the value of the expression