| /** |
| * 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.Sets; |
| import java.util.Set; |
| |
| /** |
| * Minimal set that doesn't hold strong references to the contained keys. |
| * |
| * @author jessewilson@google.com (Jesse Wilson) |
| */ |
| final class WeakKeySet { |
| |
| /** |
| * We store strings rather than keys so we don't hold strong references. |
| * |
| * <p>One potential problem with this approach is that parent and child injectors cannot define |
| * keys whose class names are equal but class loaders are different. This shouldn't be an issue |
| * in practice. |
| */ |
| private Set<String> backingSet = Sets.newHashSet(); |
| |
| public boolean add(Key<?> key) { |
| return backingSet.add(key.toString()); |
| } |
| |
| public boolean contains(Object o) { |
| return o instanceof Key && backingSet.contains(o.toString()); |
| } |
| } |