| /** |
| * 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.types; |
| |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Performs deep copies (based on underlying PType deep copying) of Collections. |
| * |
| * @param <T> The type of Tuple implementation being copied |
| */ |
| public class CollectionDeepCopier<T> implements DeepCopier<Collection<T>> { |
| |
| private PType<T> elementType; |
| |
| public CollectionDeepCopier(PType<T> elementType) { |
| this.elementType = elementType; |
| } |
| |
| @Override |
| public void initialize(Configuration conf) { |
| this.elementType.initialize(conf); |
| } |
| |
| @Override |
| public Collection<T> deepCopy(Collection<T> source) { |
| if (source == null) { |
| return null; |
| } |
| List<T> copiedCollection = Lists.newArrayListWithCapacity(source.size()); |
| for (T value : source) { |
| copiedCollection.add(elementType.getDetachedValue(value)); |
| } |
| return copiedCollection; |
| } |
| |
| } |