How to use Matchers.subclassesOf to create a TypeLiteral

[Jochen Wiedmann]

Hi,

I am trying to binding a listener. My code looks like this:

        final InjectionListener<?> injectionListener = Generics.cast(new InjectionListener<ILifecycleListener>(){
            @Override
            public void afterInjection(ILifecycleListener pInjectee) {
                controller.addListener(pInjectee);
            }
        });
        final TypeListener typeListener = new TypeListener(){
            @Override
            public <I> void hear(TypeLiteral<I> pType, TypeEncounter<I> pEncounter) {
                @SuppressWarnings("unchecked")
                final InjectionListener<I> listener = (InjectionListener<I>) injectionListener;
                pEncounter.register(listener);
            }
        };
        final Matcher<TypeLiteral<?>> matcher = Generics.cast(Matchers.subclassesOf(ILifecycleListener.class));
        pBinder.bindListener(matcher, typeListener);

However, I am getting the exception below. The reason seems to be with Matchers.subclassesOf(), because my example works, if I use Matchers.any().

Any ideas, what might be wrong?

Thanks,

Jochen


com.google.inject.internal.util.$ComputationException: com.google.inject.internal.util.$ComputationException: java.lang.ClassCastException: com.google.inject.TypeLiteral cannot be cast to java.lang.Class
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:553)
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
    at com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
    at com.google.inject.internal.FailableCache.get(FailableCache.java:50)
    at com.google.inject.internal.ConstructorInjectorStore.get(ConstructorInjectorStore.java:49)
    at com.google.inject.internal.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:125)
    at com.google.inject.internal.InjectorImpl.initializeJitBinding(InjectorImpl.java:521)
    at com.google.inject.internal.InjectorImpl.createJustInTimeBinding(InjectorImpl.java:847)
    at com.google.inject.internal.InjectorImpl.createJustInTimeBindingRecursive(InjectorImpl.java:772)
    at com.google.inject.internal.InjectorImpl.getJustInTimeBinding(InjectorImpl.java:256)
    at com.google.inject.internal.InjectorImpl.getBindingOrThrow(InjectorImpl.java:205)
    at com.google.inject.internal.InjectorImpl.getInternalFactory(InjectorImpl.java:853)
    at com.google.inject.internal.FactoryProxy.notify(FactoryProxy.java:46)
    at com.google.inject.internal.ProcessedBindingData.runCreationListeners(ProcessedBindingData.java:50)
    at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:133)
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:106)
    at com.google.inject.Guice.createInjector(Guice.java:95)
    at com.google.inject.Guice.createInjector(Guice.java:72)
    at com.google.inject.Guice.createInjector(Guice.java:62)
    at com.github.jochen.afw.core.guice.GuiceComponentFactoryBuilder.build(GuiceComponentFactoryBuilder.java:144)
    at com.github.jochen.afw.core.guice.GuiceComponentFactoryBuilderTest.testSuccessfullConfiguration(GuiceComponentFactoryBuilderTest.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: com.google.inject.internal.util.$ComputationException: java.lang.ClassCastException: com.google.inject.TypeLiteral cannot be cast to java.lang.Class
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:553)
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
    at com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
    at com.google.inject.internal.FailableCache.get(FailableCache.java:50)
    at com.google.inject.internal.MembersInjectorStore.get(MembersInjectorStore.java:65)
    at com.google.inject.internal.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:73)
    at com.google.inject.internal.ConstructorInjectorStore.access$000(ConstructorInjectorStore.java:28)
    at com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:36)
    at com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:32)
    at com.google.inject.internal.FailableCache$1.apply(FailableCache.java:39)
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:549)
    ... 43 more
Caused by: java.lang.ClassCastException: com.google.inject.TypeLiteral cannot be cast to java.lang.Class
    at com.google.inject.matcher.Matchers$SubclassesOf.matches(Matchers.java:187)
    at com.google.inject.internal.MembersInjectorStore.createWithListeners(MembersInjectorStore.java:100)
    at com.google.inject.internal.MembersInjectorStore.access$000(MembersInjectorStore.java:34)
    at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:42)
    at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:39)
    at com.google.inject.internal.FailableCache$1.apply(FailableCache.java:39)
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:549)
    ... 53 more

[Stuart McCulloch]

On 2 Apr 2014, at 10:54, Jochen Wiedmann <jochen....@gmail.com> wrote:

Hi,

I am trying to binding a listener. My code looks like this:

        final InjectionListener<?> injectionListener = Generics.cast(new InjectionListener<ILifecycleListener>(){
            @Override
            public void afterInjection(ILifecycleListener pInjectee) {
                controller.addListener(pInjectee);
            }
        });
        final TypeListener typeListener = new TypeListener(){
            @Override
            public <I> void hear(TypeLiteral<I> pType, TypeEncounter<I> pEncounter) {
                @SuppressWarnings("unchecked")
                final InjectionListener<I> listener = (InjectionListener<I>) injectionListener;
                pEncounter.register(listener);
            }
        };
        final Matcher<TypeLiteral<?>> matcher = Generics.cast(Matchers.subclassesOf(ILifecycleListener.class));
        pBinder.bindListener(matcher, typeListener);

However, I am getting the exception below. The reason seems to be with Matchers.subclassesOf(), because my example works, if I use Matchers.any().

Any ideas, what might be wrong?

Matchers.subclassesOf matches instances of Class but you’re using it to match instances of TypeLiteral, and Class != TypeLiteral

You'll need to provide your own Matcher implementation that works with TypeLiteral like the following example from a comment on the CustomInjections page of the wiki:

https://code.google.com/p/google-guice/wiki/CustomInjections

http://pastie.org/1064618

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

import com.google.inject.TypeLiteral;
import com.google.inject.matcher.AbstractMatcher;
import com.google.inject.matcher.Matcher;

/**
 * A factory of {@link Matcher}s that can be used in 
 * {@link AbstractModule}.bindListener(matcher,listener) 
 * @author ooktay
 */
public class TypeMatchers {
   private static class SubClassesOf extends AbstractMatcher<TypeLiteral<?>> {
      private final Class<?> baseClass;

      private SubClassesOf(Class<?> baseClass) {
         this.baseClass = baseClass;
      }

      @Override
      public boolean matches(TypeLiteral<?> t) {
         return baseClass.isAssignableFrom( t.getRawType() );
      }
   }

   /**
    * Matcher matches all classes that extends, implements or is the same as baseClass
    * @param baseClass
    * @return Matcher
    */
   public static Matcher<TypeLiteral<?>> subclassesOf(Class<?> baseClass) {
      return new SubClassesOf(baseClass);
   }
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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