| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.hdfs.util; |
| |
| import java.util.HashMap; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| /** |
| * A {@link GSet} implementation by {@link HashMap}. |
| */ |
| @InterfaceAudience.Private |
| public class GSetByHashMap<K, E extends K> implements GSet<K, E> { |
| private final HashMap<K, E> m; |
| |
| public GSetByHashMap(int initialCapacity, float loadFactor) { |
| m = new HashMap<K, E>(initialCapacity, loadFactor); |
| } |
| |
| @Override |
| public int size() { |
| return m.size(); |
| } |
| |
| @Override |
| public boolean contains(K k) { |
| return m.containsKey(k); |
| } |
| |
| @Override |
| public E get(K k) { |
| return m.get(k); |
| } |
| |
| @Override |
| public E put(E element) { |
| if (element == null) { |
| throw new UnsupportedOperationException("Null element is not supported."); |
| } |
| return m.put(element, element); |
| } |
| |
| @Override |
| public E remove(K k) { |
| return m.remove(k); |
| } |
| |
| @Override |
| public Iterator<E> iterator() { |
| return m.values().iterator(); |
| } |
| } |