/**
* 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.canopy;
import org.apache.hadoop.io.LongWritable;
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.matrix.DenseVector;
import org.apache.mahout.matrix.Vector;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class InputMapper extends MapReduceBase implements
Mapper<LongWritable, Text, Text, Text> {
@Override
public void map(LongWritable key, Text values,
OutputCollector<Text, Text> output, Reporter reporter) throws IOException {
String[] numbers = values.toString().split(" ");
// sometimes there are multiple separator spaces
List<Double> doubles = new ArrayList<Double>();
for (String value : numbers) {
if (value.length() > 0)
doubles.add(Double.valueOf(value));
}
Vector result = new DenseVector(doubles.size());
int index = 0;
for (Double d : doubles)
result.set(index++, d);
output.collect(null, new Text(result.asFormatString()));
}
}