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:

ValueResolver<T>

public class NullSafeValueResolverWrapper<T>
extends Object
implements ValueResolver<T>

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, MuleContext, ObjectTypeParametersResolver) )} factory method

Since:

4.0

Method Summary

Modifier and Type	Method and Description
boolean	isDynamic() returns false if subsequent invocations to ValueResolver.resolve(Event) will return the same value.
static <T> ValueResolver<T>	of(ValueResolver<T> delegate, org.mule.metadata.api.model.MetadataType type, MuleContext muleContext, ObjectTypeParametersResolver parametersResolver) Creates a new instance
T	resolve(Event event) 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,
                                      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

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(Event event)
          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:

event - a Event

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(Event) 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 this resolve is dynamic