org.springframework.xd.integration.hadoop.partition

Class MessageExpressionMethods

java.lang.Object

org.springframework.xd.integration.hadoop.partition.MessageExpressionMethods

public class MessageExpressionMethods
extends java.lang.Object

Helper class to work with a spel expressions resolving values from a Message. A StandardEvaluationContext is expected and MessagePartitionKeyMethodResolver and MessagePartitionKeyPropertyAccessor registered with it.

Author:

Janne Valkealahti

Constructor Summary

Constructors

Constructor and Description
MessageExpressionMethods(org.springframework.expression.spel.support.StandardEvaluationContext evaluationContext) Instantiates a new message expression methods with a StandardEvaluationContext.
MessageExpressionMethods(org.springframework.expression.spel.support.StandardEvaluationContext evaluationContext, boolean register) Instantiates a new message expression methods with a StandardEvaluationContext.

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	getValue(org.springframework.expression.Expression expression, org.springframework.messaging.Message<?> message, java.lang.Class<T> desiredResultType) Gets the value.

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageExpressionMethods

public MessageExpressionMethods(org.springframework.expression.spel.support.StandardEvaluationContext evaluationContext)

Instantiates a new message expression methods with a StandardEvaluationContext.

Parameters:

evaluationContext - the spel evaluation context

MessageExpressionMethods

public MessageExpressionMethods(org.springframework.expression.spel.support.StandardEvaluationContext evaluationContext,
                        boolean register)

Instantiates a new message expression methods with a StandardEvaluationContext.

Parameters:

evaluationContext - the spel evaluation context

register - if method resolver and property accessor should be registered

Method Detail

getValue

public <T> T getValue(org.springframework.expression.Expression expression,
             org.springframework.messaging.Message<?> message,
             java.lang.Class<T> desiredResultType)
           throws org.springframework.expression.EvaluationException

Gets the value.

Type Parameters:

T - the generic type

Parameters:

expression - the expression

desiredResultType - the desired result type

Returns:

the value

Throws:

org.springframework.expression.EvaluationException - the evaluation exception