| /** |
| * 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.mapreduce.lib.output; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.OutputCommitter; |
| import org.apache.hadoop.mapreduce.OutputFormat; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| /** |
| * FilterOutputFormat is a convenience class that wraps OutputFormat. |
| */ |
| public class FilterOutputFormat <K,V> extends OutputFormat<K, V> { |
| |
| protected OutputFormat<K,V> baseOut; |
| |
| public FilterOutputFormat() { |
| this.baseOut = null; |
| } |
| |
| /** |
| * Create a FilterOutputFormat based on the underlying output format. |
| * @param baseOut the underlying OutputFormat |
| */ |
| public FilterOutputFormat(OutputFormat<K,V> baseOut) { |
| this.baseOut = baseOut; |
| } |
| |
| @Override |
| public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| return getBaseOut().getRecordWriter(context); |
| } |
| |
| @Override |
| public void checkOutputSpecs(JobContext context) |
| throws IOException, InterruptedException { |
| getBaseOut().checkOutputSpecs(context); |
| } |
| |
| @Override |
| public OutputCommitter getOutputCommitter(TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| return getBaseOut().getOutputCommitter(context); |
| } |
| |
| private OutputFormat<K,V> getBaseOut() throws IOException { |
| if (baseOut == null) { |
| throw new IOException("OutputFormat not set for FilterOutputFormat"); |
| } |
| return baseOut; |
| } |
| /** |
| * <code>FilterRecordWriter</code> is a convenience wrapper |
| * class that extends the {@link RecordWriter}. |
| */ |
| |
| public static class FilterRecordWriter<K,V> extends RecordWriter<K,V> { |
| |
| protected RecordWriter<K,V> rawWriter = null; |
| |
| public FilterRecordWriter() { |
| rawWriter = null; |
| } |
| |
| public FilterRecordWriter(RecordWriter<K,V> rwriter) { |
| this.rawWriter = rwriter; |
| } |
| |
| @Override |
| public void write(K key, V value) throws IOException, InterruptedException { |
| getRawWriter().write(key, value); |
| } |
| |
| @Override |
| public void close(TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| getRawWriter().close(context); |
| } |
| |
| private RecordWriter<K,V> getRawWriter() throws IOException { |
| if (rawWriter == null) { |
| throw new IOException("Record Writer not set for FilterRecordWriter"); |
| } |
| return rawWriter; |
| } |
| } |
| } |