Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactFactory.java @ 114:19b86e27d0c3

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New XPath constants and methods that retrieve important nodes of the DESCRIBE document. artifacts/trunk@1328 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 18 Feb 2011 14:21:32 +0000
parents 933bbc9fc11f
children b2115f484edb
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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11 import de.intevation.artifacts.Artifact;
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12 import de.intevation.artifacts.ArtifactFactory;
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13 import de.intevation.artifacts.ArtifactSerializer;
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14
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15 import org.apache.log4j.Logger;
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16
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17 import org.w3c.dom.Document;
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18 import org.w3c.dom.Node;
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19
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20 /**
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21 * Trivial implementation of the ArtifactFactory interface.
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22 * Time to live (ttl), name and description are configured
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23 * via the Node given to #setup(Document, Node) with attributes
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24 * of same name. The class name of the artifacts to be build by this
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25 * factory is configures with the attribute 'artifact'.
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26 *
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27 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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28 */
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29 public class DefaultArtifactFactory
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30 implements ArtifactFactory
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31 {
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32 private static Logger logger =
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33 Logger.getLogger(DefaultArtifactFactory.class);
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34
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35 /**
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36 * XPath to access the TTL of this artifact.
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37 */
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38 public static final String XPATH_TTL = "@ttl";
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39 /**
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40 * XPath to access the name of this factory.
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41 */
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42 public static final String XPATH_NAME = "@name";
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43 /**
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44 * XPath to access the description of this artifact factory.
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45 */
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46 public static final String XPATH_DESCRIPTION = "@description";
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47 /**
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48 * XPath to access the class name of the artifacts to be build
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49 * by this factory.
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50 */
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51 public static final String XPATH_ARTIFACT = "@artifact";
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52
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53 /**
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54 * Default description of this factory if none is given by the
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55 * configuration.
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56 */
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57 public static final String DEFAULT_DESCRIPTION =
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58 "No description available";
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59
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60 /**
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61 * Class to load if no artifact class is given in the configuration.
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62 */
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63 public static final String DEFAULT_ARTIFACT =
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64 "de.intevation.artifactdatabase.DefaultArtifact";
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65
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66 /**
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67 * The Time to live of the artifacts build by this factory.
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68 */
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69 protected Long ttl;
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71 /**
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72 * The name of this factory.
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73 */
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74 protected String name;
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76 /**
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77 * The description of this factory.
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78 */
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79 protected String description;
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81 /**
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82 * The class of the artifacts to be build by this factory.
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83 */
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84 protected Class artifactClass;
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85
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86 /**
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87 * Default constructor.
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88 */
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89 public DefaultArtifactFactory() {
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90 }
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91
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92 public String getName() {
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93 return name;
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94 }
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95
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96 public String getDescription() {
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97 return description;
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98 }
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99
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100 public Artifact createArtifact(
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101 String identifier,
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102 Object context,
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103 Document data
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104 ) {
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105 try {
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106 Artifact artifact =
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107 (Artifact)artifactClass.newInstance();
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108
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109 artifact.setup(identifier, this, context, data);
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110
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111 return artifact;
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112 }
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113 catch (InstantiationException ie) {
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114 logger.error(ie.getLocalizedMessage(), ie);
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115 }
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116 catch (IllegalAccessException iae) {
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117 logger.error(iae.getLocalizedMessage(), iae);
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118 }
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119 catch (ClassCastException cce) {
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120 logger.error(cce.getLocalizedMessage(), cce);
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121 }
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122
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123 return null;
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124 }
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125
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126 public void setup(Document document, Node factoryNode) {
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127
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128 String ttlString = Config.getStringXPath(factoryNode, XPATH_TTL);
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129 if (ttlString != null) {
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130 try {
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131 ttl = Long.valueOf(ttlString);
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132 }
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133 catch (NumberFormatException nfe) {
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134 logger.warn("'" + ttlString + "' is not an integer.");
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135 }
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136 }
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137
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138 description = Config.getStringXPath(
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139 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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140
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141 name = Config.getStringXPath(
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142 factoryNode, XPATH_NAME, toString());
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143
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144 String artifact = Config.getStringXPath(
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145 factoryNode, XPATH_ARTIFACT, DEFAULT_ARTIFACT);
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146
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147 try {
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148 artifactClass = Class.forName(artifact);
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149 }
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150 catch (ClassNotFoundException cnfe) {
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151 logger.error(cnfe.getLocalizedMessage(), cnfe);
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152 }
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153
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154 if (artifactClass == null) {
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155 artifactClass = DefaultArtifact.class;
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156 }
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157 }
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158
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159 public Long timeToLiveUntouched(Artifact artifact, Object context) {
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160 return ttl;
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161 }
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162
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163 public ArtifactSerializer getSerializer() {
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164 return DefaultArtifactSerializer.INSTANCE;
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165 }
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166 }
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167 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org