/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed 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 eu.stratosphere.nephele.util;
import eu.stratosphere.core.fs.FSDataOutputStream;
import eu.stratosphere.core.fs.FileStatus;
import eu.stratosphere.core.fs.FileSystem;
import eu.stratosphere.core.fs.Path;
import eu.stratosphere.core.io.StringRecord;
import eu.stratosphere.runtime.io.api.RecordReader;
import eu.stratosphere.nephele.template.AbstractFileOutputTask;
/**
* A file line writer reads string records its input gate and writes them to the associated output file.
*
*/
public class FileLineWriter extends AbstractFileOutputTask {
/**
* The record reader through which incoming string records are received.
*/
private RecordReader<StringRecord> input = null;
@Override
public void invoke() throws Exception {
Path outputPath = getFileOutputPath();
FileSystem fs = FileSystem.get(outputPath.toUri());
if (fs.exists(outputPath)) {
FileStatus status = fs.getFileStatus(outputPath);
if (status.isDir()) {
outputPath = new Path(outputPath.toUri().toString() + "/file_" + getIndexInSubtaskGroup() + ".txt");
}
}
final FSDataOutputStream outputStream = fs.create(outputPath, true);
while (this.input.hasNext()) {
StringRecord record = this.input.next();
byte[] recordByte = (record.toString() + "\r\n").getBytes();
outputStream.write(recordByte, 0, recordByte.length);
}
outputStream.close();
}
@Override
public void registerInputOutput() {
this.input = new RecordReader<StringRecord>(this, StringRecord.class);
}
@Override
public int getMaximumNumberOfSubtasks() {
// The default implementation always returns -1
return -1;
}
}