| /** |
| * Copyright (C) 2008 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.BindingImpl; |
| import com.google.inject.internal.Errors; |
| import com.google.inject.internal.ErrorsException; |
| import com.google.inject.internal.InternalContext; |
| import com.google.inject.internal.InternalFactory; |
| import com.google.inject.spi.Dependency; |
| import com.google.inject.spi.PrivateElements; |
| |
| /** |
| * This factory exists in a parent injector. When invoked, it retrieves its value from a child |
| * injector. |
| */ |
| class ExposedKeyFactory<T> implements InternalFactory<T>, BindingProcessor.CreationListener { |
| private final Key<T> key; |
| private final PrivateElements privateElements; |
| private BindingImpl<T> delegate; |
| |
| public ExposedKeyFactory(Key<T> key, PrivateElements privateElements) { |
| this.key = key; |
| this.privateElements = privateElements; |
| } |
| |
| public void notify(Errors errors) { |
| InjectorImpl privateInjector = (InjectorImpl) privateElements.getInjector(); |
| BindingImpl<T> explicitBinding = privateInjector.state.getExplicitBinding(key); |
| |
| // validate that the child injector has its own factory. If the getInternalFactory() returns |
| // this, then that child injector doesn't have a factory (and getExplicitBinding has returned |
| // its parent's binding instead |
| if (explicitBinding.getInternalFactory() == this) { |
| errors.withSource(explicitBinding.getSource()).exposedButNotBound(key); |
| return; |
| } |
| |
| this.delegate = explicitBinding; |
| } |
| |
| public T get(Errors errors, InternalContext context, Dependency<?> dependency) |
| throws ErrorsException { |
| return delegate.getInternalFactory().get(errors, context, dependency); |
| } |
| } |