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

Class NullSafeValueResolverWrapper<T>

java.lang.Object

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

Type Parameters:

T - the generic type of the produced values.

All Implemented Interfaces:

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

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

A ValueResolver wrapper which generates and returns default instances if the delegate returns null.

The values are generated according to the rules described in NullSafe.

Instances are to be obtained through the of(ValueResolver, MetadataType, ReflectionCache, ExpressionManager, MuleContext, ObjectTypeParametersResolver) )} )} factory method

Since:

4.0

Field Summary

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

PHASE_NAME

Method Summary

Modifier and Type	Method and Description
void	initialise()
boolean	isDynamic() Returns false if subsequent invocations to ValueResolver.resolve(ValueResolvingContext) will return the same value.
static <T> ValueResolver<T>	of(ValueResolver<T> delegate, org.mule.metadata.api.model.MetadataType type, ReflectionCache reflectionCache, ExpressionManager expressionManager, MuleContext muleContext, ObjectTypeParametersResolver parametersResolver) Creates a new instance
T	resolve(ValueResolvingContext context) Resolves a value from the given event

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <T> ValueResolver<T> of(ValueResolver<T> delegate,
                                      org.mule.metadata.api.model.MetadataType type,
                                      ReflectionCache reflectionCache,
                                      ExpressionManager expressionManager,
                                      MuleContext muleContext,
                                      ObjectTypeParametersResolver parametersResolver)

Creates a new instance

Type Parameters:

T - the generic type of the produced values

Parameters:

delegate - the ValueResolver to wrap

type - the type of the value this resolver returns

reflectionCache - the cache for expensive reflection lookups

muleContext - the current MuleContext

Returns:

a new null safe ValueResolver

Throws:

org.mule.runtime.extension.api.exception.IllegalParameterModelDefinitionException - if used on parameters of not supported types

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

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:

whether the resolved value changes based or the resolution context or not

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