| /** |
| * 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.hadoop.mapreduce.lib.input; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| /** |
| * This class converts the input keys and values to their String forms by |
| * calling toString() method. This class to SequenceFileAsTextInputFormat |
| * class is as LineRecordReader class to TextInputFormat class. |
| */ |
| public class SequenceFileAsTextRecordReader |
| extends RecordReader<Text, Text> { |
| |
| private final SequenceFileRecordReader<WritableComparable<?>, Writable> |
| sequenceFileRecordReader; |
| |
| private Text key; |
| private Text value; |
| |
| public SequenceFileAsTextRecordReader() |
| throws IOException { |
| sequenceFileRecordReader = |
| new SequenceFileRecordReader<WritableComparable<?>, Writable>(); |
| } |
| |
| public void initialize(InputSplit split, TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| sequenceFileRecordReader.initialize(split, context); |
| } |
| |
| @Override |
| public Text getCurrentKey() |
| throws IOException, InterruptedException { |
| return key; |
| } |
| |
| @Override |
| public Text getCurrentValue() |
| throws IOException, InterruptedException { |
| return value; |
| } |
| |
| /** Read key/value pair in a line. */ |
| public synchronized boolean nextKeyValue() |
| throws IOException, InterruptedException { |
| if (!sequenceFileRecordReader.nextKeyValue()) { |
| return false; |
| } |
| if (key == null) { |
| key = new Text(); |
| } |
| if (value == null) { |
| value = new Text(); |
| } |
| key.set(sequenceFileRecordReader.getCurrentKey().toString()); |
| value.set(sequenceFileRecordReader.getCurrentValue().toString()); |
| return true; |
| } |
| |
| public float getProgress() throws IOException, InterruptedException { |
| return sequenceFileRecordReader.getProgress(); |
| } |
| |
| public synchronized void close() throws IOException { |
| sequenceFileRecordReader.close(); |
| } |
| } |