/**
* 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.syntheticcontrol.meanshift;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.mahout.clustering.meanshift.MeanShiftCanopy;
import org.apache.mahout.matrix.Vector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
public class OutputMapper extends MapReduceBase implements
Mapper<Text, Text, Text, Text> {
private static final Logger log = LoggerFactory.getLogger(OutputMapper.class);
private int clusters = 0;
@Override
public void map(Text key, Text values, OutputCollector<Text, Text> output,
Reporter reporter) throws IOException {
clusters++;
String foo = values.toString();
MeanShiftCanopy canopy = MeanShiftCanopy.decodeCanopy(foo);
for (Vector point : canopy.getBoundPoints())
output.collect(key, new Text(point.asFormatString()));
}
@Override
public void close() throws IOException {
log.info("+++ Clusters={}", clusters);
super.close();
}
}