| /** |
| * 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.util; |
| |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Sets; |
| import org.apache.crunch.ReadableData; |
| import org.apache.crunch.SourceTarget; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.TaskInputOutputContext; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Set; |
| |
| public class UnionReadableData<T> implements ReadableData<T> { |
| |
| private final List<ReadableData<T>> data; |
| |
| public UnionReadableData(List<ReadableData<T>> data) { |
| this.data = data; |
| } |
| |
| @Override |
| public Set<SourceTarget<?>> getSourceTargets() { |
| Set<SourceTarget<?>> srcTargets = Sets.newHashSet(); |
| for (ReadableData<T> rd: data) { |
| srcTargets.addAll(rd.getSourceTargets()); |
| } |
| return srcTargets; |
| } |
| |
| @Override |
| public void configure(Configuration conf) { |
| for (ReadableData<T> rd : data) { |
| rd.configure(conf); |
| } |
| } |
| |
| @Override |
| public Iterable<T> read(final TaskInputOutputContext<?, ?, ?, ?> context) throws IOException { |
| List<Iterable<T>> iterables = Lists.newArrayList(); |
| for (ReadableData<T> rd : data) { |
| iterables.add(rd.read(context)); |
| } |
| return Iterables.concat(iterables); |
| } |
| } |