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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactSerializer.java @ 89:d348fe1fd822

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More javadoc (fixes small glitches, too). artifacts/trunk@845 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 26 Mar 2010 16:16:32 +0000
parents 0f48188a6e02
children e27cf9c84eb8
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import de.intevation.artifacts.Artifact;
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4 import de.intevation.artifacts.ArtifactSerializer;
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5
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6 import java.io.InputStream;
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7 import java.io.IOException;
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8 import java.io.OutputStream;
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9 import java.io.ObjectInputStream;
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10 import java.io.ObjectOutputStream;
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11 import java.io.ByteArrayOutputStream;
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12 import java.io.ByteArrayInputStream;
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13
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14 import java.util.zip.GZIPOutputStream;
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15 import java.util.zip.GZIPInputStream;
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16
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17 import org.apache.log4j.Logger;
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18
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19 /**
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20 * Default implementation of the ArtifactSerializer interface.
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21 * It uses serialized Java objects which are gzipped and
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22 * turned into bytes.
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23 *
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48d1a9a082c2 Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
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24 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
41
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25 */
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26 public class DefaultArtifactSerializer
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27 implements ArtifactSerializer
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28 {
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29 private static Logger logger =
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30 Logger.getLogger(DefaultArtifactSerializer.class);
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31
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32 /**
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33 * Static instance to avoid repeated creation of Serializers.
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34 */
41
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35 public static final ArtifactSerializer INSTANCE =
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36 new DefaultArtifactSerializer();
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37
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38 /**
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39 * Default constructor.
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40 */
41
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41 public DefaultArtifactSerializer() {
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42 }
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43
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44 public Artifact fromBytes(byte [] bytes) {
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45
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46 if (bytes == null) {
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47 return null;
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48 }
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49
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50 ObjectInputStream ois = null;
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51
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52 try {
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53 ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
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54 GZIPInputStream gis = new GZIPInputStream(bis);
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55 ois = getObjectInputStream(gis);
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56
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57 return (Artifact)ois.readObject();
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58 }
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59 catch (IOException ioe) {
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60 logger.error(ioe.getLocalizedMessage(), ioe);
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61 }
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62 catch (ClassNotFoundException cnfe) {
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63 logger.error(cnfe.getLocalizedMessage(), cnfe);
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64 }
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65 catch (ClassCastException cce) {
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66 logger.error(cce.getLocalizedMessage(), cce);
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67 }
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68 finally {
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69 if (ois != null) {
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70 try { ois.close(); }
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71 catch (IOException ioe) { }
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72 }
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73 }
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74
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75 return null;
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76 }
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77
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78 public byte [] toBytes(Artifact artifact) {
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79 try {
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80 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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81 GZIPOutputStream gos = new GZIPOutputStream(bos);
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82 ObjectOutputStream oos = getObjectOutputStream(gos);
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83
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84 oos.writeObject(artifact);
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85 oos.flush();
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86 oos.close();
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87
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88 return bos.toByteArray();
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89 }
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90 catch (IOException ioe) {
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91 logger.error(ioe.getLocalizedMessage(), ioe);
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92 throw new RuntimeException(ioe);
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93 }
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94 }
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95
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96 /**
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97 * Wraps an input stream into an object input stream. You may
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98 * overwrite this to get a more specialized deserializer.
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99 * @param is The raw input stream
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100 * @return An instance of a subclass of ObjectInputStream.
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101 * @throws IOException Thrown if something went wrong during
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102 * creation of the object input stream.
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103 */
41
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104 protected ObjectInputStream getObjectInputStream(InputStream is)
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105 throws IOException
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106 {
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107 return new ObjectInputStream(is);
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108 }
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109
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110 /**
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111 * Wraps an output stream into an object output stream. You may
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112 * overwrite this to get a more specialized serializer.
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113 * @param os the raw output stream.
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114 * @return An instance of a subclass of ObjectOutputStream.
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115 * @throws IOException Thrown if something went wrong during
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116 * creation of the object output stream.
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117 */
41
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118 protected ObjectOutputStream getObjectOutputStream(OutputStream os)
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119 throws IOException
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120 {
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121 return new ObjectOutputStream(os);
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122 }
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123 }
87
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124 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org