| /** |
| * Copyright (C) 2006 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.util.ToStringBuilder; |
| |
| /** |
| * A binding from a {@link Key} (type and name) to an implementation. |
| * |
| * @author crazybob@google.com (Bob Lee) |
| */ |
| public class Binding<T> { |
| |
| final ContainerImpl container; |
| final Key<T> key; |
| final Object source; |
| final InternalFactory<? extends T> internalFactory; |
| |
| Binding(ContainerImpl container, Key<T> key, Object source, |
| InternalFactory<? extends T> internalFactory) { |
| this.container = container; |
| this.key = key; |
| this.source = source; |
| this.internalFactory = internalFactory; |
| } |
| |
| /** |
| * Gets the key for this binding. |
| */ |
| public Key<T> getKey() { |
| return key; |
| } |
| |
| /** |
| * Gets the source object, an arbitrary object which points back to the |
| * configuration which resulted in this binding. |
| */ |
| public Object getSource() { |
| return source; |
| } |
| |
| volatile Factory<T> factory; |
| |
| /** |
| * Gets the factory which returns instances of {@code T}. |
| */ |
| public Factory<T> getFactory() { |
| if (factory == null) { |
| factory = container.getFactory(key); |
| } |
| return factory; |
| } |
| |
| InternalFactory<? extends T> getInternalFactory() { |
| return internalFactory; |
| } |
| |
| static <T> Binding<T> newInstance(ContainerImpl container, Key<T> key, |
| Object source, InternalFactory<? extends T> internalFactory) { |
| return new Binding<T>(container, key, source, internalFactory); |
| } |
| |
| /** |
| * Is this a constant binding? |
| */ |
| boolean isConstant() { |
| return internalFactory instanceof ConstantFactory<?>; |
| } |
| |
| public String toString() { |
| return new ToStringBuilder(Binding.class) |
| .add("key", key) |
| .add("source", source) |
| .add("factory", internalFactory) |
| .toString(); |
| } |
| } |