org.mule.runtime.module.extension.internal.runtime.resolver

Class ExpressionValueResolver<T>

java.lang.Object

org.mule.runtime.module.extension.internal.runtime.resolver.ExpressionValueResolver<T>

Type Parameters:

T -

All Implemented Interfaces:

org.mule.runtime.api.lifecycle.Initialisable, ExpressionBasedValueResolver<T>, ValueResolver<T>

Direct Known Subclasses:

ExpressionTypedValueValueResolver

public class ExpressionValueResolver<T>
extends Object
implements ExpressionBasedValueResolver<T>, org.mule.runtime.api.lifecycle.Initialisable

A ValueResolver which evaluates a MEL expressions

It resolves the expressions by making use of the AttributeEvaluator so that it's compatible with simple expressions and templates alike

Since:

4.0

Field Summary

Fields inherited from interface org.mule.runtime.api.lifecycle.Initialisable

PHASE_NAME

Constructor Summary

Constructors

Constructor and Description
ExpressionValueResolver(String expression)
ExpressionValueResolver(String expression, org.mule.runtime.api.metadata.DataType expectedDataType, Boolean melDefault, Boolean melAvailable)

Method Summary

Modifier and Type	Method and Description
String	getExpression()
void	initialise()
boolean	isDynamic() Returns false if subsequent invocations to ValueResolver.resolve(ValueResolvingContext) will return the same value.
boolean	isMelAvailable()
T	resolve(ValueResolvingContext context) Resolves a value from the given event
protected <V> org.mule.runtime.api.metadata.TypedValue<V>	resolveTypedValue(ValueResolvingContext context)
void	setRegistry(org.mule.runtime.api.artifact.Registry registry)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionValueResolver

public ExpressionValueResolver(String expression,
                               org.mule.runtime.api.metadata.DataType expectedDataType,
                               Boolean melDefault,
                               Boolean melAvailable)

ExpressionValueResolver

public ExpressionValueResolver(String expression)

Method Detail

initialise

public void initialise()
                throws org.mule.runtime.api.lifecycle.InitialisationException

Specified by:

initialise in interface org.mule.runtime.api.lifecycle.Initialisable

Throws:

org.mule.runtime.api.lifecycle.InitialisationException

resolve

public T resolve(ValueResolvingContext context)
          throws org.mule.runtime.api.exception.MuleException

Description copied from interface: ValueResolver

Resolves a value from the given event

Specified by:

resolve in interface ValueResolver<T>

Parameters:

context - the context for the current resolution attempt

Returns:

a resolved value

Throws:

org.mule.runtime.api.exception.MuleException - if the resolution of the value fails

resolveTypedValue

protected <V> org.mule.runtime.api.metadata.TypedValue<V> resolveTypedValue(ValueResolvingContext context)

isDynamic

public boolean isDynamic()

Description copied from interface: ValueResolver

Returns false if subsequent invocations to ValueResolver.resolve(ValueResolvingContext) will return the same value. Notice that if it returns true, then it might return different values per invocation but that's not guaranteed.

Specified by:

isDynamic in interface ValueResolver<T>

Returns:

true

getExpression

public String getExpression()

Specified by:

getExpression in interface ExpressionBasedValueResolver<T>

Returns:

The configured expression in the ValueResolver

isMelAvailable

public boolean isMelAvailable()

setRegistry

public void setRegistry(org.mule.runtime.api.artifact.Registry registry)