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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 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  org.apache.hadoop.fs.FileSystem;
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;
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 = null;
  protected RecordWriter<WritableComparable<?>, Writable> getBaseRecordWriter(
      FileSystem fs, JobConf jobString name, Progressable arg3)
      throws IOException {
    if ( == null) {
       = new SequenceFileOutputFormat<WritableComparable<?>, Writable>();
    return .getRecordWriter(fsjobnamearg3);
  protected String generateFileNameForKeyValue(WritableComparable<?> k,
      Writable vString name) {
    StringTuple key = (StringTuplek;
    if (key.length() == 1
        && key.stringAt(0).equals(.))
      return "trainer-vocabCount/" + name;
      return "trainer-tfIdf/" + name;
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