/**
* 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.hive.ql.io.udf;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.LineRecordReader;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.TextInputFormat;
import java.io.IOException;
/**
A simple input format that does a rot13 on the inputs
*/
class Rot13InputFormat extends TextInputFormat {
public static void rot13(byte[] bytes, int offset, int length) {
for(int i=offset; i < offset+length; i++) {
if (bytes[i] >= 'A' && bytes[i] <= 'Z') {
bytes[i] = (byte) ('A' + (bytes[i] - 'A' + 13) % 26);
} else if (bytes[i] >= 'a' && bytes[i] <= 'z') {
bytes[i] = (byte) ('a' + (bytes[i] - 'a' + 13) % 26);
}
}
}
private static class Rot13LineRecordReader extends LineRecordReader {
Rot13LineRecordReader(JobConf job, FileSplit split) throws IOException {
super(job, split);
}
public synchronized boolean next(LongWritable key,
Text value) throws IOException {
boolean result = super.next(key, value);
if (result) {
System.out.println("Read " + value);
rot13(value.getBytes(), 0, value.getLength());
System.out.println("Returned " + value);
}
return result;
}
}
public RecordReader<LongWritable, Text>
getRecordReader(InputSplit genericSplit, JobConf job,
Reporter reporter) throws IOException {
reporter.setStatus(genericSplit.toString());
return new Rot13LineRecordReader(job, (FileSplit) genericSplit);
}
}