/**
* 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.classifier.bayes.mapreduce.common;
import java.io.IOException;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.mapred.lib.MultipleOutputFormat;
import org.apache.hadoop.util.Progressable;
import org.apache.mahout.common.StringTuple;
/**
* This class extends the MultipleOutputFormat, allowing to write the output data to different output files in
* sequence file output format.
*/
public class BayesTfIdfOutputFormat extends MultipleOutputFormat<WritableComparable<?>,Writable> {
private SequenceFileOutputFormat<WritableComparable<?>,Writable> theSequenceFileOutputFormat;
@Override
protected RecordWriter<WritableComparable<?>,Writable> getBaseRecordWriter(FileSystem fs,
JobConf job,
String name,
Progressable arg3) throws IOException {
if (theSequenceFileOutputFormat == null) {
theSequenceFileOutputFormat = new SequenceFileOutputFormat<WritableComparable<?>,Writable>();
}
return theSequenceFileOutputFormat.getRecordWriter(fs, job, name, arg3);
}
@Override
protected String generateFileNameForKeyValue(WritableComparable<?> k, Writable v, String name) {
StringTuple key = (StringTuple) k;
if (key.length() == 1 && key.stringAt(0).equals(BayesConstants.FEATURE_SET_SIZE)) {
return "trainer-vocabCount/" + name;
} else {
return "trainer-tfIdf/" + name;
}
}
}