Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/DefaultServiceFactory.java @ 210:b75fca1ac215

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Enhanced the State interface to retrieve its output modes. artifacts/trunk@1541 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 23 Mar 2011 10:45:36 +0000
parents b2115f484edb
children a8d62eb93cd4
rev   line source
100
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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.ServiceFactory;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import org.w3c.dom.Document;
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19 import org.w3c.dom.Node;
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20
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21 /**
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22 * Trivial implementation of the ServiceFactory interface.
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23 * Name and an description are configured by the given Node given to
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24 * #setup(Document, Node) via the 'name' and 'description' attributes.
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25 * The name of the class that provides the concrete serice is configured
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26 * by the 'service' attribute.
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27 *
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28 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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29 */
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30 public class DefaultServiceFactory
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31 implements ServiceFactory
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32 {
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33 private static Logger logger =
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34 Logger.getLogger(DefaultServiceFactory.class);
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35
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36 /**
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37 * XPath to access the name of the service.
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38 */
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39 public static final String XPATH_NAME = "@name";
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40 /**
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41 * XPath to access the description of the service.
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42 */
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43 public static final String XPATH_DESCRIPTION = "@description";
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44 /**
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45 * XPath to access the class name of the service to be build by
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46 * this factory.
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47 */
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48 public static final String XPATH_SERVICE = "@service";
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49
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50 /**
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51 * Default description if no description is given in configuration.
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52 */
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53 public static final String DEFAULT_DESCRIPTION =
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54 "No description available";
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56 /**
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57 * Loaded service class if no class name is given in the configuration.
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58 */
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59 public static final String DEFAULT_SERVICE =
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60 "de.intevation.artifactdatabase.DefaultService";
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61
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62 /**
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63 * The name of the service factory.
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64 */
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65 protected String name;
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67 /**
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68 * The description of the service factory.
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69 */
69
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70 protected String description;
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72 /**
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73 * The loaded class used to build the concrete service.
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74 */
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75 protected Class serviceClass;
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77 /**
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78 * Default constructor.
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79 */
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80 public DefaultServiceFactory() {
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81 }
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82
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83 public String getName() {
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84 return name;
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85 }
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86
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87 public String getDescription() {
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88 return description;
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89 }
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90
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91 public Service createService(Object globalContext) {
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92 try {
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93 Service service = (Service)serviceClass.newInstance();
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94
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95 service.setup(this, globalContext);
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96
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97 return service;
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98 }
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99 catch (InstantiationException ie) {
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100 logger.error(ie.getLocalizedMessage(), ie);
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101 }
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102 catch (IllegalAccessException iae) {
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103 logger.error(iae.getLocalizedMessage(), iae);
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104 }
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105 catch (ClassCastException cce) {
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106 logger.error(cce.getLocalizedMessage(), cce);
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107 }
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108
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109 return null;
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110 }
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111
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112 public void setup(Document config, Node factoryNode) {
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113
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114 description = Config.getStringXPath(
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115 factoryNode, XPATH_DESCRIPTION, DEFAULT_DESCRIPTION);
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116
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117 name = Config.getStringXPath(
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118 factoryNode, XPATH_NAME, toString());
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119
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120 String service = Config.getStringXPath(
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121 factoryNode, XPATH_SERVICE, DEFAULT_SERVICE);
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122
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123 try {
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124 serviceClass = Class.forName(service);
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125 }
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126 catch (ClassNotFoundException cnfe) {
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127 logger.error(cnfe.getLocalizedMessage(), cnfe);
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128 }
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129
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130 if (serviceClass == null) {
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131 serviceClass = DefaultService.class;
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132 }
498bb84334d0 Added base class for services and service factories.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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133 }
498bb84334d0 Added base class for services and service factories.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 }
498bb84334d0 Added base class for services and service factories.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org