fullstack/hyracks/hyracks-hdfs/hyracks-hdfs-core/src/main/java/edu/uci/ics/hyracks/hdfs/lib/TextTupleWriterFactory.java

/*
 * Copyright 2009-2012 by The Regents of the University of California
 * 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 from
 *
 *     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 edu.uci.ics.hyracks.hdfs.lib;

import java.io.DataOutput;

import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference;
import edu.uci.ics.hyracks.hdfs.api.ITupleWriter;
import edu.uci.ics.hyracks.hdfs.api.ITupleWriterFactory;

public class TextTupleWriterFactory implements ITupleWriterFactory {
    private static final long serialVersionUID = 1L;

    @Override
    public ITupleWriter getTupleWriter(IHyracksTaskContext ctx) {
        return new ITupleWriter() {
            private byte newLine = "\n".getBytes()[0];

            @Override
            public void open(DataOutput output) {

            }

            @Override
            public void write(DataOutput output, ITupleReference tuple) throws HyracksDataException {
                byte[] data = tuple.getFieldData(0);
                int start = tuple.getFieldStart(0);
                int len = tuple.getFieldLength(0);
                try {
                    output.write(data, start, len);
                    output.writeByte(newLine);
                } catch (Exception e) {
                    throw new HyracksDataException(e);
                }
            }

            @Override
            public void close(DataOutput output) {

            }

        };
    }

}