Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactCollectionFactory.java @ 122:c9cf5f33a230

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Added a default implementation of an ArtifactCollectionFactory. artifacts/trunk@1345 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 01 Mar 2011 16:31:52 +0000
parents
children db0d20440b92
rev   line source
122
c9cf5f33a230 Added a default implementation of an ArtifactCollectionFactory.
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1 /*
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2 * Copyright (c) 2011 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 package de.intevation.artifactdatabase;
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9
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10 import org.apache.log4j.Logger;
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11
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12 import org.w3c.dom.Document;
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13 import org.w3c.dom.Node;
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14
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15 import de.intevation.artifacts.ArtifactCollection;
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16 import de.intevation.artifacts.ArtifactCollectionFactory;
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17
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18
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19 /**
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20 * The default implementation of a ArtifactCollectionFactory.
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21 *
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22 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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23 */
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24 public class DefaultArtifactCollectionFactory
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25 implements ArtifactCollectionFactory
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26 {
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27 /** The logger that is used in this factory.*/
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28 private static Logger logger =
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29 Logger.getLogger(DefaultArtifactCollectionFactory.class);
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30
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31 /** XPath to access the TTL of this artifact.*/
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32 public static final String XPATH_TTL = "@ttl";
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33
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34 /** XPath to access the name of this factory.*/
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35 public static final String XPATH_NAME = "@name";
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36
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37 /** XPath to access the description of this artifact factory.*/
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38 public static final String XPATH_DESCRIPTION = "@description";
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39
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40 /**
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41 * XPath to access the class name of the artifacts to be build
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42 * by this factory.
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43 */
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44 public static final String XPATH_ARTIFACTCOLLECTION = "@artifact-collection";
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45
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46 /**
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47 * Default description of this factory if none is given by the
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48 * configuration.
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49 */
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50 public static final String DEFAULT_DESCRIPTION =
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51 "No description available";
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52
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53 /**
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54 * Class to load if no artifact class is given in the configuration.
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55 */
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56 public static final String DEFAULT_ARTIFACTCOLLECTION =
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57 "de.intevation.artifactdatabase.DefaultArtifact";
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58
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59
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60 /** The name of the factory.*/
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61 protected String name;
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62
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63 /** The description of the factory.*/
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64 protected String description;
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65
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66 /** The class that is used to instantiate new ArtifactCollection.*/
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67 protected Class clazz;
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68
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69 /** The time to live of the artifact collection build by this factory.*/
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70 protected Long ttl;
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71
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72
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73 /**
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74 * The default constructor.
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75 */
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76 public DefaultArtifactCollectionFactory() {
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77 }
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78
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79
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80 /**
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81 * The short name of this factory.
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82 *
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83 * @return the name of this factory.
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84 */
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85 public String getName() {
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86 return name;
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87 }
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88
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89
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90 /**
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91 * Description of this factory.
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92 *
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93 * @return description of the factory.
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94 */
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95 public String getDescription() {
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96 return description;
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97 }
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98
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99
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100 /**
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101 * Returns the time to live of the given artifact.
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102 *
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103 * @param artifact
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104 */
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105 public Long timeToLiveUntouched(
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106 ArtifactCollection collection,
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107 Object context)
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108 {
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109 return ttl;
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110 }
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111
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112
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113 /**
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114 * Create a new artifact of certain type, given a general purpose context and
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115 * an identifier.
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116 * @param context a context from the ArtifactDatabase.
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117 * @param identifier unique identifer for the new artifact
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118 * @param data the data containing more details for the setup of an Artifact.
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119 * @return a new {@linkplain de.intevation.artifacts.ArtifactCollection ArtifactCollection}
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120 */
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121 public ArtifactCollection createCollection(
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122 String identifier,
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123 Object context,
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124 Document data)
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125 {
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126 try {
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127 ArtifactCollection collection =
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128 (ArtifactCollection) clazz.newInstance();
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129
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130 collection.setup(identifier, this, context, data);
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131
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132 return collection;
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133 }
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134 catch (InstantiationException ie) {
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135 logger.error(ie.getLocalizedMessage(), ie);
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136 }
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137 catch (IllegalAccessException iae) {
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138 logger.error(iae.getLocalizedMessage(), iae);
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139 }
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140 catch (ClassCastException cce) {
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141 logger.error(cce.getLocalizedMessage(), cce);
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142 }
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143
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144 return null;
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145 }
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146
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147 /**
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148 * Setup the factory with a given configuration
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149 * @param config the configuration
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150 * @param factoryNode the ConfigurationNode of this Factory
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151 */
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152 public void setup(Document config, Node factoryNode) {
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153 String ttlString = Config.getStringXPath(factoryNode, XPATH_TTL);
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154 if (ttlString != null) {
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155 try {
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156 ttl = Long.valueOf(ttlString);
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157 }
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158 catch (NumberFormatException nfe) {
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159 logger.warn("'" + ttlString + "' is not an integer.");
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160 }
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161 }
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162
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163 description = Config.getStringXPath(
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164 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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165
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166 name = Config.getStringXPath(factoryNode, XPATH_NAME, toString());
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167
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168 String artifactCollection = Config.getStringXPath(
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169 factoryNode, XPATH_ARTIFACTCOLLECTION, DEFAULT_ARTIFACTCOLLECTION);
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170
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171 try {
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172 clazz = Class.forName(artifactCollection);
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173 }
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174 catch (ClassNotFoundException cnfe) {
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175 logger.error(cnfe.getLocalizedMessage(), cnfe);
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176 }
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177
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178 if (clazz == null) {
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179 clazz = DefaultArtifactCollection.class;
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180 }
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181 }
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182 }
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183 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org