/*
 * 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.common.collect.Sets;
import com.google.inject.ConfigurationException;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.TypeListener;
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)
/** * 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.
/** * 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.
/** 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.

/** * 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.) * * <p>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.
/** 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<>(errors, injector.lookups); Set<TypeListener> alreadySeenListeners = Sets.newHashSet(); for (TypeListenerBinding binding : typeListenerBindings) { TypeListener typeListener = binding.getListener(); if (!alreadySeenListeners.contains(typeListener) && binding.getTypeMatcher().matches(type)) { alreadySeenListeners.add(typeListener); try { typeListener.hear(type, encounter); } catch (RuntimeException e) { errors.errorNotifyingTypeListener(binding, type, e); } } } encounter.invalidate(); errors.throwIfNewErrors(numErrorsBefore); return new MembersInjectorImpl<T>(injector, type, encounter, injectors); }
Returns the injectors for the specified injection points.
/** 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); } }