Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultServiceFactory.java @ 310:63122b9dee1d

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Added interface to listen events in the backend. artifacts/trunk@2435 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 01 Aug 2011 09:41:40 +0000
parents a8d62eb93cd4
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.Service;
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14 import de.intevation.artifacts.GlobalContext;
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15 import de.intevation.artifacts.ServiceFactory;
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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 import org.w3c.dom.Document;
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20 import org.w3c.dom.Node;
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21
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22 /**
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23 * Trivial implementation of the ServiceFactory interface.
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24 * Name and an description are configured by the given Node given to
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25 * #setup(Document, Node) via the 'name' and 'description' attributes.
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26 * The name of the class that provides the concrete serice is configured
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27 * by the 'service' attribute.
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28 *
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29 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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30 */
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31 public class DefaultServiceFactory
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32 implements ServiceFactory
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33 {
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34 private static Logger logger =
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35 Logger.getLogger(DefaultServiceFactory.class);
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36
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37 /**
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38 * XPath to access the name of the service.
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39 */
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40 public static final String XPATH_NAME = "@name";
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41 /**
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42 * XPath to access the description of the service.
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43 */
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44 public static final String XPATH_DESCRIPTION = "@description";
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45 /**
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46 * XPath to access the class name of the service to be build by
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47 * this factory.
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48 */
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49 public static final String XPATH_SERVICE = "@service";
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51 /**
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52 * Default description if no description is given in 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 * Loaded service class if no class name is given in the configuration.
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59 */
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60 public static final String DEFAULT_SERVICE =
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61 "de.intevation.artifactdatabase.DefaultService";
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62
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63 /**
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64 * The name of the service factory.
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65 */
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66 protected String name;
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68 /**
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69 * The description of the service factory.
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70 */
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71 protected String description;
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73 /**
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74 * The loaded class used to build the concrete service.
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75 */
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76 protected Class serviceClass;
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78 /**
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79 * Default constructor.
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80 */
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81 public DefaultServiceFactory() {
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82 }
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83
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84 @Override
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85 public String getName() {
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86 return name;
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87 }
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89 @Override
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90 public String getDescription() {
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91 return description;
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92 }
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94 @Override
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95 public Service createService(GlobalContext globalContext) {
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96 try {
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97 Service service = (Service)serviceClass.newInstance();
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98
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99 service.setup(this, globalContext);
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100
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101 return service;
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102 }
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103 catch (InstantiationException ie) {
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104 logger.error(ie.getLocalizedMessage(), ie);
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105 }
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106 catch (IllegalAccessException iae) {
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107 logger.error(iae.getLocalizedMessage(), iae);
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108 }
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109 catch (ClassCastException cce) {
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110 logger.error(cce.getLocalizedMessage(), cce);
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111 }
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112
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113 return null;
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114 }
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116 @Override
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117 public void setup(Document config, Node factoryNode) {
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118
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119 description = Config.getStringXPath(
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120 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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121
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122 name = Config.getStringXPath(
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123 factoryNode, XPATH_NAME, toString());
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124
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125 String service = Config.getStringXPath(
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126 factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);
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127
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128 try {
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129 serviceClass = Class.forName(service);
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130 }
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131 catch (ClassNotFoundException cnfe) {
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132 logger.error(cnfe.getLocalizedMessage(), cnfe);
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133 }
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134
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135 if (serviceClass == null) {
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136 serviceClass = DefaultService.class;
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137 }
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138 }
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139 }
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140 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org