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/**
* Copyright (C) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.inject.internal;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.inject.ConfigurationException;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.TypeListenerBinding;
import java.lang.reflect.Field;
import java.util.List;
import java.util.Set;
/**
* Members injectors by type.
*
* @author jessewilson@google.com (Jesse Wilson)
*/
final class MembersInjectorStore {
private final InjectorImpl injector;
private final ImmutableList<TypeListenerBinding> typeListenerBindings;
private final FailableCache<TypeLiteral<?>, MembersInjectorImpl<?>> cache
= new FailableCache<TypeLiteral<?>, MembersInjectorImpl<?>>() {
@Override protected MembersInjectorImpl<?> create(TypeLiteral<?> type, Errors errors)
throws ErrorsException {
return createWithListeners(type, errors);
}
};
MembersInjectorStore(InjectorImpl injector,
List<TypeListenerBinding> typeListenerBindings) {
this.injector = injector;
this.typeListenerBindings = ImmutableList.copyOf(typeListenerBindings);
}
/**
* Returns true if any type listeners are installed. Other code may take shortcuts when there
* aren't any type listeners.
*/
public boolean hasTypeListeners() {
return !typeListenerBindings.isEmpty();
}
/**
* Returns a new complete members injector with injection listeners registered.
*/
@SuppressWarnings("unchecked") // the MembersInjector type always agrees with the passed type
public <T> MembersInjectorImpl<T> get(TypeLiteral<T> key, Errors errors) throws ErrorsException {
return (MembersInjectorImpl<T>) cache.get(key, errors);
}
/**
* Purges a type literal from the cache. Use this only if the type is not actually valid for
* binding and needs to be purged. (See issue 319 and
* ImplicitBindingTest#testCircularJitBindingsLeaveNoResidue and
* #testInstancesRequestingProvidersForThemselvesWithChildInjectors for examples of when this is
* necessary.)
*
* Returns true if the type was stored in the cache, false otherwise.
*/
boolean remove(TypeLiteral<?> type) {
return cache.remove(type);
}
/**
* Creates a new members injector and attaches both injection listeners and method aspects.
*/
private <T> MembersInjectorImpl<T> createWithListeners(TypeLiteral<T> type, Errors errors)
throws ErrorsException {
int numErrorsBefore = errors.size();
Set<InjectionPoint> injectionPoints;
try {
injectionPoints = InjectionPoint.forInstanceMethodsAndFields(type);
} catch (ConfigurationException e) {
errors.merge(e.getErrorMessages());
injectionPoints = e.getPartialValue();
}
ImmutableList<SingleMemberInjector> injectors = getInjectors(injectionPoints, errors);
errors.throwIfNewErrors(numErrorsBefore);
EncounterImpl<T> encounter = new EncounterImpl<T>(errors, injector.lookups);
for (TypeListenerBinding typeListener : typeListenerBindings) {
if (typeListener.getTypeMatcher().matches(type)) {
try {
typeListener.getListener().hear(type, encounter);
} catch (RuntimeException e) {
errors.errorNotifyingTypeListener(typeListener, type, e);
}
}
}
encounter.invalidate();
errors.throwIfNewErrors(numErrorsBefore);
return new MembersInjectorImpl<T>(injector, type, encounter, injectors);
}
/**
* Returns the injectors for the specified injection points.
*/
ImmutableList<SingleMemberInjector> getInjectors(
Set<InjectionPoint> injectionPoints, Errors errors) {
List<SingleMemberInjector> injectors = Lists.newArrayList();
for (InjectionPoint injectionPoint : injectionPoints) {
try {
Errors errorsForMember = injectionPoint.isOptional()
? new Errors(injectionPoint)
: errors.withSource(injectionPoint);
SingleMemberInjector injector = injectionPoint.getMember() instanceof Field
? new SingleFieldInjector(this.injector, injectionPoint, errorsForMember)
: new SingleMethodInjector(this.injector, injectionPoint, errorsForMember);
injectors.add(injector);
} catch (ErrorsException ignoredForNow) {
// ignored for now
}
}
return ImmutableList.copyOf(injectors);
}
}
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