/**
* 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.avro.mapred;
import java.io.IOException;
import org.apache.avro.util.Utf8;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobConfigurable;
import org.apache.hadoop.mapred.LineRecordReader;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
/**
* An {@link org.apache.hadoop.mapred.InputFormat} for text files.
* Each line is a {@link Utf8} key; values are null.
*/
public class AvroUtf8InputFormat
extends FileInputFormat<AvroWrapper<Utf8>, NullWritable>
implements JobConfigurable {
static class Utf8LineRecordReader implements
RecordReader<AvroWrapper<Utf8>, NullWritable> {
private LineRecordReader lineRecordReader;
private LongWritable currentKeyHolder = new LongWritable();
private Text currentValueHolder = new Text();
public Utf8LineRecordReader(Configuration job,
FileSplit split) throws IOException {
this.lineRecordReader = new LineRecordReader(job, split);
}
public void close() throws IOException {
lineRecordReader.close();
}
public long getPos() throws IOException {
return lineRecordReader.getPos();
}
public float getProgress() throws IOException {
return lineRecordReader.getProgress();
}
public boolean next(AvroWrapper<Utf8> key, NullWritable value)
throws IOException {
boolean success = lineRecordReader.next(currentKeyHolder,
currentValueHolder);
if (success) {
key.datum(new Utf8(currentValueHolder.getBytes())
.setLength(currentValueHolder.getLength()));
} else {
key.datum(null);
}
return success;
}
@Override
public AvroWrapper<Utf8> createKey() {
return new AvroWrapper<Utf8>(null);
}
@Override
public NullWritable createValue() {
return NullWritable.get();
}
}
private CompressionCodecFactory compressionCodecs = null;
public void configure(JobConf conf) {
compressionCodecs = new CompressionCodecFactory(conf);
}
protected boolean isSplitable(FileSystem fs, Path file) {
return compressionCodecs.getCodec(file) == null;
}
@Override
public RecordReader<AvroWrapper<Utf8>, NullWritable>
getRecordReader(InputSplit split, JobConf job, Reporter reporter)
throws IOException {
reporter.setStatus(split.toString());
return new Utf8LineRecordReader(job, (FileSplit) split);
}
}