| /** |
| * 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.contrib.utils.join; |
| |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableUtils; |
| import org.apache.hadoop.mapred.JobConf; |
| |
| /** |
| * This abstract class serves as the base class for the values that |
| * flow from the mappers to the reducers in a data join job. |
| * Typically, in such a job, the mappers will compute the source |
| * tag of an input record based on its attributes or based on the |
| * file name of the input file. This tag will be used by the reducers |
| * to re-group the values of a given key according to their source tags. |
| * |
| */ |
| public abstract class TaggedMapOutput implements Writable { |
| protected Text tag; |
| |
| public TaggedMapOutput() { |
| this.tag = new Text(""); |
| } |
| |
| public Text getTag() { |
| return tag; |
| } |
| |
| public void setTag(Text tag) { |
| this.tag = tag; |
| } |
| |
| public abstract Writable getData(); |
| |
| public TaggedMapOutput clone(JobConf job) { |
| return (TaggedMapOutput) WritableUtils.clone(this, job); |
| } |
| |
| } |