/**
* 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 java.nio.ByteBuffer;
import org.apache.avro.file.DataFileReader;
import org.apache.avro.file.FileReader;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
class AvroAsTextRecordReader<T> implements RecordReader<Text, Text> {
private FileReader<T> reader;
private T datum;
private long start;
private long end;
public AvroAsTextRecordReader(JobConf job, FileSplit split)
throws IOException {
this(DataFileReader.openReader
(new FsInput(split.getPath(), job), new GenericDatumReader<T>()), split);
}
protected AvroAsTextRecordReader(FileReader<T> reader, FileSplit split)
throws IOException {
this.reader = reader;
reader.sync(split.getStart()); // sync to start
this.start = reader.tell();
this.end = split.getStart() + split.getLength();
}
public Text createKey() {
return new Text();
}
public Text createValue() {
return new Text();
}
public boolean next(Text key, Text ignore) throws IOException {
if (!reader.hasNext() || reader.pastSync(end))
return false;
datum = reader.next(datum);
if (datum instanceof ByteBuffer) {
ByteBuffer b = (ByteBuffer) datum;
if (b.hasArray()) {
int offset = b.arrayOffset();
int start = b.position();
int length = b.remaining();
key.set(b.array(), offset + start, offset + start + length);
} else {
byte[] bytes = new byte[b.remaining()];
b.duplicate().get(bytes);
key.set(bytes);
}
} else {
key.set(datum.toString());
}
return true;
}
public float getProgress() throws IOException {
if (end == start) {
return 0.0f;
} else {
return Math.min(1.0f, (getPos() - start) / (float)(end - start));
}
}
public long getPos() throws IOException {
return reader.tell();
}
public void close() throws IOException { reader.close(); }
}