001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.oozie;
020
021import java.io.ByteArrayInputStream;
022import java.io.DataInputStream;
023import java.io.IOException;
024import org.apache.oozie.compression.CodecFactory;
025import org.apache.oozie.compression.CompressionCodec;
026
027/**
028 * BinaryBlob to maintain compress and uncompressed data
029 */
030public class BinaryBlob {
031
032    private byte[] rawBlob;
033    private byte[] bytes;
034
035    /**
036     * Construct a binaryblob
037     *
038     * @param byteArray the source byte array
039     * @param isUncompressed - true if data is uncompressed
040     */
041    public BinaryBlob(byte[] byteArray, boolean isUncompressed) {
042        if (isUncompressed) {
043            this.bytes = byteArray;
044            this.rawBlob = null;
045        }
046        else {
047            this.rawBlob = byteArray;
048        }
049    }
050
051    /**
052     * Set bytes
053     *
054     * @param byteArray the byte array
055     */
056    public void setBytes(byte[] byteArray) {
057        this.bytes = byteArray;
058        this.rawBlob = null;
059    }
060
061    /**
062     * Returns a decompressed byte array
063     *
064     * @return byte array
065     */
066    public byte[] getBytes() {
067        if (bytes != null) {
068            return bytes;
069        }
070        if (rawBlob == null) {
071            return null;
072        }
073        try {
074            DataInputStream dais = new DataInputStream(new ByteArrayInputStream(rawBlob));
075            CompressionCodec codec = CodecFactory.getDeCompressionCodec(dais);
076            if (codec != null) {
077                bytes = codec.decompressToBytes(dais);
078            }
079            else {
080                bytes = rawBlob;
081            }
082            dais.close();
083        }
084        catch (IOException ex) {
085            throw new RuntimeException(ex);
086        }
087        rawBlob = null;
088        return bytes;
089
090    }
091
092    /**
093     * Returns a raw blob
094     *
095     * @return raw blob
096     */
097    public byte[] getRawBlob() {
098        if (rawBlob != null) {
099            return rawBlob;
100        }
101        if (bytes == null) {
102            return null;
103        }
104        if (CodecFactory.isCompressionEnabled()) {
105            byte[] headerBytes = CodecFactory.getHeaderBytes();
106            try {
107                rawBlob = CodecFactory.getCompressionCodec().compressBytes(headerBytes, bytes);
108            }
109            catch (IOException ex) {
110                throw new RuntimeException(ex);
111            }
112        }
113        else {
114            rawBlob = bytes;
115        }
116        return rawBlob;
117    }
118
119}