Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultServiceFactory.java @ 93:e27cf9c84eb8

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Unified imports. artifacts/trunk@849 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 28 Mar 2010 15:57:40 +0000
parents 68285f7bc476
children 933bbc9fc11f
rev   line source
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1 package de.intevation.artifactdatabase;
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2
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3 import de.intevation.artifacts.Service;
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4 import de.intevation.artifacts.ServiceFactory;
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5
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6 import org.apache.log4j.Logger;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Node;
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10
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11 /**
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12 * Trivial implementation of the ServiceFactory interface.
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13 * Name and an description are configured by the given Node given to
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14 * #setup(Document, Node) via the 'name' and 'description' attributes.
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15 * The name of the class that provides the concrete serice is configured
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16 * by the 'service' attribute.
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17 *
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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19 */
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20 public class DefaultServiceFactory
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21 implements ServiceFactory
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22 {
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23 private static Logger logger =
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24 Logger.getLogger(DefaultServiceFactory.class);
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25
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26 /**
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27 * XPath to access the name of the service.
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28 */
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29 public static final String XPATH_NAME = "@name";
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30 /**
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31 * XPath to access the description of the service.
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32 */
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33 public static final String XPATH_DESCRIPTION = "@description";
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34 /**
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35 * XPath to access the class name of the service to be build by
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36 * this factory.
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37 */
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38 public static final String XPATH_SERVICE = "@service";
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39
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40 /**
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41 * Default description if no description is given in configuration.
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42 */
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43 public static final String DEFAULT_DESCRIPTION =
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44 "No description available";
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45
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46 /**
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47 * Loaded service class if no class name is given in the configuration.
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48 */
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49 public static final String DEFAULT_SERVICE =
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50 "de.intevation.artifactdatabase.DefaultService";
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51
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52 /**
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53 * The name of the service factory.
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54 */
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55 protected String name;
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56
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57 /**
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58 * The description of the service factory.
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59 */
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60 protected String description;
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62 /**
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63 * The loaded class used to build the concrete service.
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64 */
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65 protected Class serviceClass;
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67 /**
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68 * Default constructor.
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69 */
69
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70 public DefaultServiceFactory() {
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71 }
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72
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73 public String getName() {
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74 return name;
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75 }
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76
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77 public String getDescription() {
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78 return description;
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79 }
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80
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81 public Service createService(Object globalContext) {
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82 try {
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83 Service service = (Service)serviceClass.newInstance();
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84
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85 service.setup(this, globalContext);
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86
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87 return service;
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88 }
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89 catch (InstantiationException ie) {
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90 logger.error(ie.getLocalizedMessage(), ie);
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91 }
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92 catch (IllegalAccessException iae) {
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93 logger.error(iae.getLocalizedMessage(), iae);
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94 }
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95 catch (ClassCastException cce) {
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96 logger.error(cce.getLocalizedMessage(), cce);
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97 }
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98
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99 return null;
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100 }
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101
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102 public void setup(Document config, Node factoryNode) {
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103
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104 description = Config.getStringXPath(
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105 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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106
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107 name = Config.getStringXPath(
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108 factoryNode, XPATH_NAME, toString());
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109
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110 String service = Config.getStringXPath(
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111 factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);
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112
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113 try {
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114 serviceClass = Class.forName(service);
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115 }
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116 catch (ClassNotFoundException cnfe) {
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117 logger.error(cnfe.getLocalizedMessage(), cnfe);
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118 }
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119
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120 if (serviceClass == null) {
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121 serviceClass = DefaultService.class;
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122 }
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123 }
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124 }
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125 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org