| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * 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.android.tradefed.util; |
| |
| import java.util.Collection; |
| |
| /** |
| * A {@link MultiMap} that ensures unique values for each key. |
| * <p/> |
| * Attempts to insert a duplicate value will be ignored |
| * @param <K> |
| */ |
| public class UniqueMultiMap<K, V> extends MultiMap<K, V> { |
| |
| @Override |
| public V put(K key, V value) { |
| Collection<V> values = get(key); |
| if (values != null && values.contains(value)) { |
| return null; |
| } |
| return super.put(key, value); |
| } |
| } |