Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactCollectionFactory.java @ 436:15179c77aa1d flys-2.9.3

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Documentation, so that readers know a tiny bit more what is going on.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 16 Oct 2012 15:08:43 +0200
parents f367be55dd35
children
rev   line source
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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 de.intevation.artifacts.common.utils.Config;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import org.w3c.dom.Document;
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15 import org.w3c.dom.Node;
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16
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17 import de.intevation.artifacts.ArtifactCollection;
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18 import de.intevation.artifacts.ArtifactCollectionFactory;
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19
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20 import java.util.Date;
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21
122
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22
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23 /**
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24 * The default implementation of a ArtifactCollectionFactory.
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25 *
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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27 */
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28 public class DefaultArtifactCollectionFactory
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29 implements ArtifactCollectionFactory
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30 {
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31 /** The logger that is used in this factory.*/
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32 private static Logger logger =
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33 Logger.getLogger(DefaultArtifactCollectionFactory.class);
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34
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35 /** XPath to access the TTL of this artifact.*/
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36 public static final String XPATH_TTL = "@ttl";
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37
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38 /** XPath to access the name of this factory.*/
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39 public static final String XPATH_NAME = "@name";
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40
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41 /** XPath to access the description of this artifact factory.*/
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42 public static final String XPATH_DESCRIPTION = "@description";
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43
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44 /**
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45 * XPath to access the class name of the artifacts to be build
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46 * by this factory.
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47 */
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48 public static final String XPATH_ARTIFACTCOLLECTION = "@artifact-collection";
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49
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50 /**
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51 * Default description of this factory if none is given by the
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52 * configuration.
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53 */
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54 public static final String DEFAULT_DESCRIPTION =
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55 "No description available";
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56
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57 /**
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58 * Class to load if no artifact class is given in the configuration.
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59 */
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60 public static final String DEFAULT_ARTIFACTCOLLECTION =
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61 "de.intevation.artifactdatabase.DefaultArtifact";
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62
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63
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64 /** The name of the factory.*/
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65 protected String name;
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66
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67 /** The description of the factory.*/
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68 protected String description;
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69
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70 /** The class that is used to instantiate new ArtifactCollection.*/
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71 protected Class clazz;
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72
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73 /** The time to live of the artifact collection build by this factory.*/
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74 protected Long ttl;
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75
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76
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77 /**
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78 * The default constructor.
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79 */
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80 public DefaultArtifactCollectionFactory() {
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81 }
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82
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83
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84 /**
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85 * The short name of this factory.
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86 *
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87 * @return the name of this factory.
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88 */
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89 public String getName() {
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90 return name;
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91 }
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92
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93
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94 /**
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95 * Description of this factory.
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96 *
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97 * @return description of the factory.
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98 */
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99 public String getDescription() {
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100 return description;
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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 * Returns the time to live of the given artifact.
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106 */
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107 public Long timeToLiveUntouched(
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108 ArtifactCollection collection,
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109 Object context)
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110 {
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111 return ttl;
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112 }
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113
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114
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115 /**
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116 * Create a new artifact of certain type, given a general purpose context and
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117 * an identifier.
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118 * @param context a context from the ArtifactDatabase.
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119 * @param identifier unique identifer for the new artifact
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120 * @param data the data containing more details for the setup of an Artifact.
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121 * @return a new {@linkplain de.intevation.artifacts.ArtifactCollection ArtifactCollection}
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122 */
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123 public ArtifactCollection createCollection(
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124 String identifier,
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125 String name,
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126 Date creationTime,
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127 long ttl,
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128 Document data,
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129 Object context
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130 ) {
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131 try {
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132 ArtifactCollection collection =
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133 (ArtifactCollection) clazz.newInstance();
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134
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135 collection.setup(identifier,
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136 name,
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137 creationTime,
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138 ttl,
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139 this,
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140 context,
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141 data);
122
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142
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143 return collection;
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144 }
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145 catch (InstantiationException ie) {
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146 logger.error(ie.getLocalizedMessage(), ie);
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147 }
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148 catch (IllegalAccessException iae) {
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149 logger.error(iae.getLocalizedMessage(), iae);
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150 }
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151 catch (ClassCastException cce) {
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152 logger.error(cce.getLocalizedMessage(), cce);
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153 }
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154
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155 return null;
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156 }
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157
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158 /**
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159 * Setup the factory with a given configuration
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160 * @param config the configuration
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161 * @param factoryNode the ConfigurationNode of this Factory
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162 */
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163 public void setup(Document config, Node factoryNode) {
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164 String ttlString = Config.getStringXPath(factoryNode, XPATH_TTL);
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165 if (ttlString != null) {
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166 try {
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167 ttl = Long.valueOf(ttlString);
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168 }
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169 catch (NumberFormatException nfe) {
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170 logger.warn("'" + ttlString + "' is not an integer.");
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171 }
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172 }
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173
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174 description = Config.getStringXPath(
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175 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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176
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177 name = Config.getStringXPath(factoryNode, XPATH_NAME, toString());
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178
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179 String artifactCollection = Config.getStringXPath(
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180 factoryNode, XPATH_ARTIFACTCOLLECTION, DEFAULT_ARTIFACTCOLLECTION);
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181
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182 try {
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183 clazz = Class.forName(artifactCollection);
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184 }
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185 catch (ClassNotFoundException cnfe) {
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186 logger.error(cnfe.getLocalizedMessage(), cnfe);
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187 }
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188
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189 if (clazz == null) {
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190 clazz = DefaultArtifactCollection.class;
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191 }
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192 }
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193 }
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194 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org