hadoop-mapreduce/src/contrib/streaming/src/java/org/apache/hadoop/streaming/PipeCombiner.java

/**
 * 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.streaming;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

import org.apache.hadoop.mapred.JobConf;

public class PipeCombiner extends PipeReducer {
  String getPipeCommand(JobConf job) {
    String str = job.get("stream.combine.streamprocessor");
    try {
      if (str != null) {
        return URLDecoder.decode(str, "UTF-8");
      }
    } catch (UnsupportedEncodingException e) {
      System.err.println("stream.combine.streamprocessor" + 
                         " in jobconf not found");
    }
    return null;
  }
  boolean getDoPipe() {
    return (getPipeCommand(job_) != null);
  }
}