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 */
018package org.apache.oozie;
019
020import java.io.ByteArrayInputStream;
021import java.io.DataInputStream;
022import java.io.IOException;
023import java.io.UnsupportedEncodingException;
024
025import org.apache.oozie.compression.CodecFactory;
026import org.apache.oozie.compression.CompressionCodec;
027
028/**
029 * StringBlob to maintain compress and uncompressed data
030 */
031public class StringBlob {
032
033    private byte[] rawBlob;
034    private String string;
035
036    /**
037     * Construct string blob from compressed byte array
038     *
039     * @param byteArray
040     */
041    public StringBlob(byte[] byteArray) {
042        this.rawBlob = byteArray;
043    }
044
045    /**
046     * Construct StringBlob with uncompressed string
047     *
048     * @param string
049     */
050    public StringBlob(String inputString) {
051        this.string = inputString;
052        this.rawBlob = null;
053    }
054
055    /**
056     * Set string
057     *
058     * @param str
059     */
060    public void setString(String str) {
061        this.string = str;
062        this.rawBlob = null;
063    }
064
065    /**
066     * Get uncompressed string
067     *
068     * @return uncompressed string
069     */
070    public String getString() {
071        if (string != null) {
072            return string;
073        }
074        if (rawBlob == null) {
075            return null;
076        }
077        try {
078            DataInputStream dais = new DataInputStream(new ByteArrayInputStream(rawBlob));
079            CompressionCodec codec = CodecFactory.getDeCompressionCodec(dais);
080            if (codec != null) {
081                string = codec.decompressToString(dais);
082            }
083            else {
084                string = new String(rawBlob, CodecFactory.UTF_8_ENCODING);
085            }
086            dais.close();
087
088        }
089        catch (IOException ex) {
090            throw new RuntimeException(ex);
091        }
092        rawBlob = null;
093        return string;
094    }
095
096    /**
097     * Get raw blob
098     *
099     * @return raw blob
100     */
101    public byte[] getRawBlob() {
102        if (rawBlob != null) {
103            return rawBlob;
104        }
105        if (string == null) {
106            return null;
107        }
108        if (CodecFactory.isCompressionEnabled()) {
109            byte[] bytes = CodecFactory.getHeaderBytes();
110            try {
111                rawBlob = CodecFactory.getCompressionCodec().compressString(bytes, string);
112            }
113            catch (IOException ex) {
114                throw new RuntimeException(ex);
115            }
116        }
117        else {
118            rawBlob = string.getBytes();
119        }
120        return rawBlob;
121    }
122
123}