limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 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 | |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 17 | package com.google.inject.spi; |
| 18 | |
| 19 | import com.google.inject.Binding; |
| 20 | |
| 21 | /** |
| 22 | * No-op visitor for subclassing. All interface methods simply delegate to |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 23 | * {@link #visitOther(Element)}, returning its result. |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 24 | * |
limpbizkit | 00ca9f7 | 2008-08-02 17:56:17 +0000 | [diff] [blame] | 25 | * @param <V> any type to be returned by the visit method. Use {@link Void} with |
| 26 | * {@code return null} if no return type is needed. |
| 27 | * |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 28 | * @author sberlin@gmail.com (Sam Berlin) |
limpbizkit | c489adf | 2008-11-18 07:01:33 +0000 | [diff] [blame] | 29 | * @since 2.0 |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 30 | */ |
limpbizkit | afa4b5d | 2008-08-02 18:40:47 +0000 | [diff] [blame] | 31 | public abstract class DefaultElementVisitor<V> implements ElementVisitor<V> { |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 32 | |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 33 | /** |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 34 | * Default visit implementation. Returns {@code null}. |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 35 | */ |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 36 | protected V visitOther(Element element) { |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 37 | return null; |
| 38 | } |
| 39 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 40 | public V visit(Message message) { |
| 41 | return visitOther(message); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 42 | } |
| 43 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 44 | public <T> V visit(Binding<T> binding) { |
| 45 | return visitOther(binding); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 46 | } |
| 47 | |
limpbizkit | bf0d876 | 2009-02-19 09:06:22 +0000 | [diff] [blame] | 48 | /*if[AOP]*/ |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 49 | public V visit(InterceptorBinding interceptorBinding) { |
| 50 | return visitOther(interceptorBinding); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 51 | } |
limpbizkit | bf0d876 | 2009-02-19 09:06:22 +0000 | [diff] [blame] | 52 | /*end[AOP]*/ |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 53 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 54 | public V visit(ScopeBinding scopeBinding) { |
| 55 | return visitOther(scopeBinding); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 56 | } |
| 57 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 58 | public V visit(TypeConverterBinding typeConverterBinding) { |
| 59 | return visitOther(typeConverterBinding); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 60 | } |
| 61 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 62 | public <T> V visit(ProviderLookup<T> providerLookup) { |
| 63 | return visitOther(providerLookup); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 64 | } |
| 65 | |
limpbizkit | 5ae41eb | 2009-06-06 17:51:27 +0000 | [diff] [blame^] | 66 | public V visit(InjectionRequest<?> injectionRequest) { |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 67 | return visitOther(injectionRequest); |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 68 | } |
| 69 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 70 | public V visit(StaticInjectionRequest staticInjectionRequest) { |
| 71 | return visitOther(staticInjectionRequest); |
limpbizkit | 5ea4ab2 | 2008-11-25 08:43:49 +0000 | [diff] [blame] | 72 | } |
| 73 | |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 74 | public V visit(PrivateElements privateElements) { |
| 75 | return visitOther(privateElements); |
| 76 | } |
| 77 | |
| 78 | public <T> V visit(MembersInjectorLookup<T> lookup) { |
| 79 | return visitOther(lookup); |
| 80 | } |
| 81 | |
limpbizkit | ee79246 | 2009-04-08 23:48:49 +0000 | [diff] [blame] | 82 | public V visit(TypeListenerBinding binding) { |
limpbizkit | 03b81a6 | 2009-03-18 05:34:39 +0000 | [diff] [blame] | 83 | return visitOther(binding); |
limpbizkit | 5ea4ab2 | 2008-11-25 08:43:49 +0000 | [diff] [blame] | 84 | } |
limpbizkit | 477f9f9 | 2008-07-28 07:05:14 +0000 | [diff] [blame] | 85 | } |