1 /** 2 * Copyright (C) 2008 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.spi; 18 19 import com.google.inject.Scope; 20 21 import java.lang.annotation.Annotation; 22 23 /** 24 * No-op visitor for subclassing. All interface methods simply delegate to 25 * {@link #visitOther()}, returning its result. 26 * 27 * @param <V> any type to be returned by the visit method. Use {@link Void} with 28 * {@code return null} if no return type is needed. 29 * 30 * @author jessewilson (at) google.com (Jesse Wilson) 31 * @since 2.0 32 */ 33 public class DefaultBindingScopingVisitor<V> implements BindingScopingVisitor<V> { 34 35 /** 36 * Default visit implementation. Returns {@code null}. 37 */ 38 protected V visitOther() { 39 return null; 40 } 41 42 public V visitEagerSingleton() { 43 return visitOther(); 44 } 45 46 public V visitScope(Scope scope) { 47 return visitOther(); 48 } 49 50 public V visitScopeAnnotation(Class<? extends Annotation> scopeAnnotation) { 51 return visitOther(); 52 } 53 54 public V visitNoScoping() { 55 return visitOther(); 56 } 57 } 58
