Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultServiceFactory.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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10
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11 import de.intevation.artifacts.Service;
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12 import de.intevation.artifacts.ServiceFactory;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.w3c.dom.Document;
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17 import org.w3c.dom.Node;
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18
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19 /**
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20 * Trivial implementation of the ServiceFactory interface.
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21 * Name and an description are configured by the given Node given to
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22 * #setup(Document, Node) via the 'name' and 'description' attributes.
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23 * The name of the class that provides the concrete serice is configured
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24 * by the 'service' attribute.
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25 *
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26 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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27 */
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28 public class DefaultServiceFactory
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29 implements ServiceFactory
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30 {
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31 private static Logger logger =
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32 Logger.getLogger(DefaultServiceFactory.class);
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33
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34 /**
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35 * XPath to access the name of the service.
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36 */
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37 public static final String XPATH_NAME = "@name";
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38 /**
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39 * XPath to access the description of the service.
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40 */
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41 public static final String XPATH_DESCRIPTION = "@description";
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42 /**
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43 * XPath to access the class name of the service to be build by
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44 * this factory.
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45 */
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46 public static final String XPATH_SERVICE = "@service";
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47
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48 /**
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49 * Default description if no description is given in configuration.
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50 */
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51 public static final String DEFAULT_DESCRIPTION =
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52 "No description available";
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53
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54 /**
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55 * Loaded service class if no class name is given in the configuration.
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56 */
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57 public static final String DEFAULT_SERVICE =
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58 "de.intevation.artifactdatabase.DefaultService";
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59
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60 /**
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61 * The name of the service factory.
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62 */
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63 protected String name;
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64
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65 /**
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66 * The description of the service factory.
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67 */
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68 protected String description;
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70 /**
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71 * The loaded class used to build the concrete service.
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72 */
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73 protected Class serviceClass;
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74
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75 /**
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76 * Default constructor.
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77 */
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78 public DefaultServiceFactory() {
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79 }
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80
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81 public String getName() {
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82 return name;
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83 }
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84
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85 public String getDescription() {
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86 return description;
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87 }
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88
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89 public Service createService(Object globalContext) {
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90 try {
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91 Service service = (Service)serviceClass.newInstance();
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92
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93 service.setup(this, globalContext);
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94
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95 return service;
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96 }
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97 catch (InstantiationException ie) {
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98 logger.error(ie.getLocalizedMessage(), ie);
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99 }
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100 catch (IllegalAccessException iae) {
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101 logger.error(iae.getLocalizedMessage(), iae);
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102 }
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103 catch (ClassCastException cce) {
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104 logger.error(cce.getLocalizedMessage(), cce);
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105 }
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106
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107 return null;
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108 }
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109
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110 public void setup(Document config, Node factoryNode) {
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111
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112 description = Config.getStringXPath(
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113 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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114
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115 name = Config.getStringXPath(
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116 factoryNode, XPATH_NAME, toString());
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117
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118 String service = Config.getStringXPath(
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119 factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);
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120
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121 try {
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122 serviceClass = Class.forName(service);
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123 }
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124 catch (ClassNotFoundException cnfe) {
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125 logger.error(cnfe.getLocalizedMessage(), cnfe);
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126 }
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127
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128 if (serviceClass == null) {
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129 serviceClass = DefaultService.class;
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130 }
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131 }
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132 }
498bb84334d0 Added base class for services and service factories.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org