| /** |
| * 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.crunch.materialize; |
| |
| import java.io.Serializable; |
| import java.util.AbstractMap; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.crunch.Pair; |
| |
| public class MaterializableMap<K, V> extends AbstractMap<K, V> implements Serializable { |
| |
| private transient Iterable<Pair<K, V>> iterable; |
| private Map<K, V> delegate; |
| |
| public MaterializableMap(Iterable<Pair<K, V>> iterable) { |
| this.iterable = iterable; |
| } |
| |
| private Map<K, V> delegate() { |
| if (delegate == null) { |
| delegate = new HashMap<K, V>(); |
| for (Pair<K, V> x : iterable) { |
| delegate.put(x.first(), x.second()); |
| } |
| } |
| return delegate; |
| } |
| |
| @Override |
| public Set<Map.Entry<K, V>> entrySet() { |
| return delegate().entrySet(); |
| } |
| |
| @Override |
| public V get(Object key) { |
| return delegate().get(key); |
| } |
| |
| @Override |
| public boolean containsKey(Object key) { |
| return delegate().containsKey(key); |
| } |
| |
| @Override |
| public int hashCode() { |
| return delegate().hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| return delegate().equals(other); |
| } |
| } |