jp.ac.u.tokyo.m.pig.udf.store.FreeEncodingPigTextOutputFormat.java Source code

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Here is the source code for jp.ac.u.tokyo.m.pig.udf.store.FreeEncodingPigTextOutputFormat.java

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/*
 * Copyright 2012-2013 Hiromasa Horiguchi ( The University of Tokyo )
 * 
 * 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 jp.ac.u.tokyo.m.pig.udf.store;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import jp.ac.u.tokyo.m.string.StringFormatConstants;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigTextOutputFormat;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.util.StorageUtil;

public class FreeEncodingPigTextOutputFormat extends PigTextOutputFormat {

    // -----------------------------------------------------------------------------------------------------------------

    private final byte mFieldDelimiter;
    private String mEncoding = StringFormatConstants.TEXT_FORMAT_UTF8;

    // -----------------------------------------------------------------------------------------------------------------

    public FreeEncodingPigTextOutputFormat(byte aDelimiter) {
        super(aDelimiter);
        mFieldDelimiter = aDelimiter;
    }

    public FreeEncodingPigTextOutputFormat(byte aDelimiter, String aEncording) {
        this(aDelimiter);
        mEncoding = aEncording;
    }

    public FreeEncodingPigTextOutputFormat(String aDelimiter, String aEncording) {
        this(StorageUtil.parseFieldDel(aDelimiter));
        mEncoding = aEncording;
    }

    // -----------------------------------------------------------------------------------------------------------------

    @SuppressWarnings("rawtypes")
    @Override
    public RecordWriter<WritableComparable, Tuple> getRecordWriter(TaskAttemptContext job)
            throws IOException, InterruptedException {
        Configuration conf = job.getConfiguration();
        boolean isCompressed = getCompressOutput(job);
        CompressionCodec codec = null;
        String extension = "";
        if (isCompressed) {
            Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(job, GzipCodec.class);
            codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, conf);
            extension = codec.getDefaultExtension();
        }
        Path file = getDefaultWorkFile(job, extension);
        FileSystem fs = file.getFileSystem(conf);
        if (!isCompressed) {
            FSDataOutputStream fileOut = fs.create(file, false);
            return new FreeEncodingPigLineRecordWriter(fileOut, mFieldDelimiter, mEncoding);
        } else {
            FSDataOutputStream fileOut = fs.create(file, false);
            return new FreeEncodingPigLineRecordWriter(new DataOutputStream(codec.createOutputStream(fileOut)),
                    mFieldDelimiter, mEncoding);
        }
    }

    // -----------------------------------------------------------------------------------------------------------------

    @SuppressWarnings("rawtypes")
    protected static class FreeEncodingPigLineRecordWriter
            extends TextOutputFormat.LineRecordWriter<WritableComparable, Tuple> {

        private final byte mFieldDelimiter;
        private final byte[] mNewline;
        private final String mEncoding;

        public FreeEncodingPigLineRecordWriter(DataOutputStream aOut, byte aFieldDelimiter, String aEncoding) {
            super(aOut);
            this.mFieldDelimiter = aFieldDelimiter;
            try {
                mNewline = "\n".getBytes(aEncoding);
            } catch (UnsupportedEncodingException uee) {
                throw new IllegalArgumentException("can't find " + aEncoding + " encoding");
            }
            mEncoding = aEncoding;
        }

        public synchronized void write(WritableComparable key, Tuple value) throws IOException {
            int sz = value.size();
            for (int i = 0; i < sz; i++) {
                FreeEncodingStorageUtil.putField(out, value.get(i), mEncoding);
                if (i != sz - 1) {
                    out.writeByte(mFieldDelimiter);
                }
            }
            out.write(mNewline);
        }
    }

    // -----------------------------------------------------------------------------------------------------------------

}