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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactSerializer.java @ 359:f93edbfcf2bc

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Improved the Settings and Section interfaces and added default implementations for both. artifacts/trunk@3416 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 14 Dec 2011 12:20:06 +0000
parents 933bbc9fc11f
children
rev   line source
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifactdatabase;
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10
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11 import de.intevation.artifacts.Artifact;
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12 import de.intevation.artifacts.ArtifactSerializer;
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13
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14 import java.io.ByteArrayInputStream;
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15 import java.io.ByteArrayOutputStream;
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16 import java.io.IOException;
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17 import java.io.InputStream;
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18 import java.io.ObjectInputStream;
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19 import java.io.ObjectOutputStream;
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20 import java.io.OutputStream;
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21
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22 import java.util.zip.GZIPInputStream;
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23 import java.util.zip.GZIPOutputStream;
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24
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25 import org.apache.log4j.Logger;
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26
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27 /**
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28 * Default implementation of the ArtifactSerializer interface.
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29 * It uses serialized Java objects which are gzipped and
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30 * turned into bytes.
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31 *
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32 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
41
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33 */
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34 public class DefaultArtifactSerializer
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35 implements ArtifactSerializer
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36 {
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37 private static Logger logger =
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38 Logger.getLogger(DefaultArtifactSerializer.class);
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39
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40 /**
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41 * Static instance to avoid repeated creation of Serializers.
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42 */
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43 public static final ArtifactSerializer INSTANCE =
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44 new DefaultArtifactSerializer();
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45
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46 /**
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47 * Default constructor.
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48 */
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49 public DefaultArtifactSerializer() {
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50 }
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51
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52 public Artifact fromBytes(byte [] bytes) {
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53
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54 if (bytes == null) {
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55 return null;
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56 }
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57
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58 ObjectInputStream ois = null;
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59
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60 try {
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61 ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
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62 GZIPInputStream gis = new GZIPInputStream(bis);
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63 ois = getObjectInputStream(gis);
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64
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65 return (Artifact)ois.readObject();
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66 }
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67 catch (IOException ioe) {
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68 logger.error(ioe.getLocalizedMessage(), ioe);
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69 }
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70 catch (ClassNotFoundException cnfe) {
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71 logger.error(cnfe.getLocalizedMessage(), cnfe);
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72 }
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73 catch (ClassCastException cce) {
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74 logger.error(cce.getLocalizedMessage(), cce);
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75 }
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76 finally {
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77 if (ois != null) {
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78 try { ois.close(); }
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79 catch (IOException ioe) { }
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80 }
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81 }
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82
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83 return null;
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84 }
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85
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86 public byte [] toBytes(Artifact artifact) {
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87 try {
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88 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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89 GZIPOutputStream gos = new GZIPOutputStream(bos);
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90 ObjectOutputStream oos = getObjectOutputStream(gos);
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91
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92 oos.writeObject(artifact);
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93 oos.flush();
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94 oos.close();
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95
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96 return bos.toByteArray();
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97 }
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98 catch (IOException ioe) {
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99 logger.error(ioe.getLocalizedMessage(), ioe);
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100 throw new RuntimeException(ioe);
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101 }
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102 }
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103
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104 /**
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105 * Wraps an input stream into an object input stream. You may
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106 * overwrite this to get a more specialized deserializer.
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107 * @param is The raw input stream
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108 * @return An instance of a subclass of ObjectInputStream.
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109 * @throws IOException Thrown if something went wrong during
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110 * creation of the object input stream.
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111 */
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112 protected ObjectInputStream getObjectInputStream(InputStream is)
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113 throws IOException
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114 {
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115 return new ObjectInputStream(is);
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116 }
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117
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118 /**
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119 * Wraps an output stream into an object output stream. You may
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120 * overwrite this to get a more specialized serializer.
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121 * @param os the raw output stream.
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122 * @return An instance of a subclass of ObjectOutputStream.
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123 * @throws IOException Thrown if something went wrong during
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124 * creation of the object output stream.
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125 */
41
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126 protected ObjectOutputStream getObjectOutputStream(OutputStream os)
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127 throws IOException
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128 {
5e4bc24ea438 Made serilization more flexible. DB update required!!!
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129 return new ObjectOutputStream(os);
5e4bc24ea438 Made serilization more flexible. DB update required!!!
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130 }
5e4bc24ea438 Made serilization more flexible. DB update required!!!
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131 }
87
0f48188a6e02 Added some javadoc to the artifactdatabase module. Not done yet.
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132 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org