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 java.io.UnsupportedEncodingException;
025
026import org.apache.oozie.compression.CodecFactory;
027import org.apache.oozie.compression.CompressionCodec;
028
029/**
030 * StringBlob to maintain compress and uncompressed data
031 */
032public class StringBlob {
033
034    private byte[] rawBlob;
035    private String string;
036
037    /**
038     * Construct string blob from compressed byte array
039     *
040     * @param byteArray
041     */
042    public StringBlob(byte[] byteArray) {
043        this.rawBlob = byteArray;
044    }
045
046    /**
047     * Construct StringBlob with uncompressed string
048     *
049     * @param inputString
050     */
051    public StringBlob(String inputString) {
052        this.string = inputString;
053        this.rawBlob = null;
054    }
055
056    /**
057     * Set string
058     *
059     * @param str
060     */
061    public void setString(String str) {
062        this.string = str;
063        this.rawBlob = null;
064    }
065
066    /**
067     * Get uncompressed string
068     *
069     * @return uncompressed string
070     */
071    public String getString() {
072        if (string != null) {
073            return string;
074        }
075        if (rawBlob == null) {
076            return null;
077        }
078        try {
079            DataInputStream dais = new DataInputStream(new ByteArrayInputStream(rawBlob));
080            CompressionCodec codec = CodecFactory.getDeCompressionCodec(dais);
081            if (codec != null) {
082                string = codec.decompressToString(dais);
083            }
084            else {
085                string = new String(rawBlob, CodecFactory.UTF_8_ENCODING);
086            }
087            dais.close();
088
089        }
090        catch (IOException ex) {
091            throw new RuntimeException(ex);
092        }
093        rawBlob = null;
094        return string;
095    }
096
097    /**
098     * Get raw blob
099     *
100     * @return raw blob
101     */
102    public byte[] getRawBlob() {
103        if (rawBlob != null) {
104            return rawBlob;
105        }
106        if (string == null) {
107            return null;
108        }
109        if (CodecFactory.isCompressionEnabled()) {
110            byte[] bytes = CodecFactory.getHeaderBytes();
111            try {
112                rawBlob = CodecFactory.getCompressionCodec().compressString(bytes, string);
113            }
114            catch (IOException ex) {
115                throw new RuntimeException(ex);
116            }
117        }
118        else {
119            rawBlob = string.getBytes();
120        }
121        return rawBlob;
122    }
123
124}