| /** |
| * 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.spi; |
| |
| import com.google.inject.Binding; |
| |
| /** |
| * No-op visitor for subclassing. All interface methods simply delegate to {@link |
| * #visitOther(Binding)}, returning its result. |
| * |
| * @param <V> any type to be returned by the visit method. Use {@link Void} with |
| * {@code return null} if no return type is needed. |
| * |
| * @author jessewilson@google.com (Jesse Wilson) |
| * @since 2.0 |
| */ |
| public abstract class DefaultBindingTargetVisitor<T, V> implements BindingTargetVisitor<T, V> { |
| |
| /** |
| * Default visit implementation. Returns {@code null}. |
| */ |
| protected V visitOther(Binding<? extends T> binding) { |
| return null; |
| } |
| |
| public V visit(InstanceBinding<? extends T> instanceBinding) { |
| return visitOther(instanceBinding); |
| } |
| |
| public V visit(ProviderInstanceBinding<? extends T> providerInstanceBinding) { |
| return visitOther(providerInstanceBinding); |
| } |
| |
| public V visit(ProviderKeyBinding<? extends T> providerKeyBinding) { |
| return visitOther(providerKeyBinding); |
| } |
| |
| public V visit(LinkedKeyBinding<? extends T> linkedKeyBinding) { |
| return visitOther(linkedKeyBinding); |
| } |
| |
| public V visit(ExposedBinding<? extends T> exposedBinding) { |
| return visitOther(exposedBinding); |
| } |
| |
| public V visit(UntargettedBinding<? extends T> untargettedBinding) { |
| return visitOther(untargettedBinding); |
| } |
| |
| public V visit(ConstructorBinding<? extends T> constructorBinding) { |
| return visitOther(constructorBinding); |
| } |
| |
| public V visit(ConvertedConstantBinding<? extends T> convertedConstantBinding) { |
| return visitOther(convertedConstantBinding); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public V visit(ProviderBinding<? extends T> providerBinding) { |
| // TODO(cushon): remove raw (Binding) cast when we don't care about javac 6 anymore |
| return visitOther((Binding<? extends T>) (Binding) providerBinding); |
| } |
| } |