| /** |
| * 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; |
| |
| import com.google.inject.internal.Errors; |
| import com.google.inject.internal.ErrorsException; |
| import com.google.inject.internal.FailableCache; |
| import com.google.inject.internal.ImmutableList; |
| import com.google.inject.internal.Lists; |
| 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) |
| */ |
| 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); |
| } |
| |
| /** |
| * 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); |
| } |
| } |