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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.mahout.clustering.canopy;
import  org.apache.hadoop.fs.FileSystem;
import  org.apache.hadoop.fs.Path;
import  org.apache.hadoop.io.SequenceFile;
import  org.apache.hadoop.io.Text;
import  org.apache.hadoop.io.WritableComparable;
import  org.apache.hadoop.mapred.JobConf;
import  org.apache.hadoop.mapred.MapReduceBase;
import  org.apache.hadoop.mapred.Mapper;
import  org.apache.hadoop.mapred.OutputCollector;
import  org.apache.hadoop.mapred.Reporter;
public class ClusterMapper extends MapReduceBase implements
    Mapper<WritableComparable<?>, Vector, Text, Vector> {
  private List<Canopycanopies;
  public void map(WritableComparable<?> keyVector point,
                  OutputCollector<Text, Vectoroutput, Reporter reporterthrows IOException {
    Canopy.emitPointToExistingCanopies(pointoutput);
  }

  
Configure the mapper by providing its canopies. Used by unit tests.

Parameters:
canopies a List<Canopy>
  public void config(List<Canopycanopies) {
    this. = canopies;
  }
  public void configure(JobConf job) {
    super.configure(job);
    Canopy.configure(job);
    String canopyPath = job.get(.);
     = new ArrayList<Canopy>();
    try {
      Path path = new Path(canopyPath + "/part-00000");
      FileSystem fs = FileSystem.get(path.toUri(), job);
      SequenceFile.Reader reader = new SequenceFile.Reader(fspathjob);
      try {
        Text key = new Text();
        Canopy value = new Canopy();
        while (reader.next(keyvalue)) {
          .add(value);
          value = new Canopy();
        }
      } finally {
        reader.close();
      }
    } catch (IOException e) {
      throw new IllegalStateException(e);
    }
  }
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