Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultArtifactFactory.java @ 355:6bd37edd9a80

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Added handy implementation of a DataProvider. artifacts/trunk@3333 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 08:28:04 +0000
parents 694d818e99b2
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.common.utils.Config;
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12
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13 import de.intevation.artifacts.Artifact;
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14 import de.intevation.artifacts.ArtifactFactory;
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15 import de.intevation.artifacts.ArtifactSerializer;
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16 import de.intevation.artifacts.CallMeta;
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17 import de.intevation.artifacts.GlobalContext;
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18
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19 import org.apache.log4j.Logger;
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20
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21 import org.w3c.dom.Document;
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22 import org.w3c.dom.Node;
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23
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24 /**
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25 * Trivial implementation of the ArtifactFactory interface.
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26 * Time to live (ttl), name and description are configured
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27 * via the Node given to #setup(Document, Node) with attributes
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28 * of same name. The class name of the artifacts to be build by this
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29 * factory is configures with the attribute 'artifact'.
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30 *
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31 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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32 */
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33 public class DefaultArtifactFactory
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34 implements ArtifactFactory
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35 {
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36 private static Logger logger =
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37 Logger.getLogger(DefaultArtifactFactory.class);
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38
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39 /**
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40 * XPath to access the TTL of this artifact.
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41 */
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42 public static final String XPATH_TTL = "@ttl";
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43 /**
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44 * XPath to access the name of this factory.
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45 */
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46 public static final String XPATH_NAME = "@name";
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47 /**
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48 * XPath to access the description of this artifact factory.
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49 */
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50 public static final String XPATH_DESCRIPTION = "@description";
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51 /**
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52 * XPath to access the class name of the artifacts to be build
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53 * by this factory.
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54 */
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55 public static final String XPATH_ARTIFACT = "@artifact";
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57 /**
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58 * Default description of this factory if none is given by the
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59 * configuration.
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60 */
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61 public static final String DEFAULT_DESCRIPTION =
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62 "No description available";
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63
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64 /**
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65 * Class to load if no artifact class is given in the configuration.
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66 */
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67 public static final String DEFAULT_ARTIFACT =
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68 "de.intevation.artifactdatabase.DefaultArtifact";
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69
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70 /**
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71 * The Time to live of the artifacts build by this factory.
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72 */
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73 protected Long ttl;
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75 /**
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76 * The name of this factory.
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77 */
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78 protected String name;
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80 /**
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81 * The description of this factory.
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82 */
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83 protected String description;
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85 /**
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86 * The class of the artifacts to be build by this factory.
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87 */
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88 protected Class artifactClass;
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89
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90 /**
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91 * Default constructor.
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92 */
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93 public DefaultArtifactFactory() {
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94 }
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95
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96 public String getName() {
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97 return name;
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98 }
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99
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100 public String getDescription() {
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101 return description;
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102 }
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103
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104 public Artifact createArtifact(
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105 String identifier,
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106 GlobalContext context,
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107 CallMeta callMeta,
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108 Document data
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109 ) {
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110 try {
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111 Artifact artifact =
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112 (Artifact)artifactClass.newInstance();
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113
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114 artifact.setup(identifier, this, context, callMeta, data);
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115
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116 return artifact;
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117 }
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118 catch (InstantiationException ie) {
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119 logger.error(ie.getLocalizedMessage(), ie);
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120 }
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121 catch (IllegalAccessException iae) {
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122 logger.error(iae.getLocalizedMessage(), iae);
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123 }
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124 catch (ClassCastException cce) {
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125 logger.error(cce.getLocalizedMessage(), cce);
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126 }
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127
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128 return null;
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129 }
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130
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131 public void setup(Document document, Node factoryNode) {
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132
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133 String ttlString = Config.getStringXPath(factoryNode, XPATH_TTL);
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134 if (ttlString != null) {
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135 try {
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136 ttl = Long.valueOf(ttlString);
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137 }
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138 catch (NumberFormatException nfe) {
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139 logger.warn("'" + ttlString + "' is not an integer.");
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140 }
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141 }
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142
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143 description = Config.getStringXPath(
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144 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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145
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146 name = Config.getStringXPath(
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147 factoryNode, XPATH_NAME, toString());
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148
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149 String artifact = Config.getStringXPath(
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150 factoryNode, XPATH_ARTIFACT, DEFAULT_ARTIFACT);
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151
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152 try {
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153 artifactClass = Class.forName(artifact);
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154 }
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155 catch (ClassNotFoundException cnfe) {
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156 logger.error(cnfe.getLocalizedMessage(), cnfe);
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157 }
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158
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159 if (artifactClass == null) {
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160 artifactClass = DefaultArtifact.class;
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161 }
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162 }
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163
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164 public Long timeToLiveUntouched(Artifact artifact, Object context) {
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165 return ttl;
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166 }
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167
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168 public ArtifactSerializer getSerializer() {
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169 return DefaultArtifactSerializer.INSTANCE;
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170 }
10
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171 }
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172 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org