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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/context/FLYSContextFactory.java @ 106:5864c41219db

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Initializes a TransitionEngine storing all transitions for each artifact at the application start. flys-artifacts/trunk@1288 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Feb 2011 10:23:30 +0000
parents
children a228b39494a9
rev   line source
106
5864c41219db Initializes a TransitionEngine storing all transitions for each artifact at the application start.
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1 package de.intevation.flys.artifacts.context;
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2
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3 import java.io.File;
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4 import java.util.ArrayList;
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5 import java.util.List;
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6
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7 import javax.xml.xpath.XPathConstants;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import org.w3c.dom.Document;
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12 import org.w3c.dom.Element;
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13 import org.w3c.dom.NodeList;
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14
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15 import de.intevation.artifacts.ArtifactContextFactory;
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16
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18
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19 import de.intevation.artifactdatabase.Config;
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20
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21 import de.intevation.flys.artifacts.transitions.Transition;
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22 import de.intevation.flys.artifacts.transitions.TransitionEngine;
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23 import de.intevation.flys.artifacts.transitions.TransitionFactory;
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24
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25
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26 /**
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27 * The ArtifactContextFactory is used to initialize basic components and put
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28 * them into the global context of the application.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public class FLYSContextFactory implements ArtifactContextFactory {
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33
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34 /** The logger that is used in this class */
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35 private static Logger logger = Logger.getLogger(FLYSContextFactory.class);
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36
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37 /** The XPath to the artifacts configured in the configuration. */
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38 public static final String XPATH_ARTIFACTS =
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39 "/artifact-database/artifacts/artifact";
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40
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41 /** The XPath to the name of the artifact. */
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42 public static final String XPATH_ARTIFACT_NAME = "@name";
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43
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44 /** The XPath to the xlink ref in an artifact configuration. */
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45 public static final String XPATH_XLINK = "xlink:href";
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46
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47 /** The XPath to the transitions configured in the artifact config. */
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48 public static final String XPATH_TRANSITIONS =
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49 "/artifact/states/transition";
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50
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51 /**
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52 * Creates a new FLYSArtifactContext object and initialize all
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53 * components required by the application.
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54 *
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55 * @param config The artifact server configuration.
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56 * @return a FLYSArtifactContext.
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57 */
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58 public Object createArtifactContext(Document config) {
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59 FLYSContext context = new FLYSContext(config);
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60
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61 configureTransitions(config, context);
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62
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63 return context;
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64 }
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65
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66
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67 /**
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68 * This method initializes the transition configuration.
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69 *
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70 * @param config the config document.
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71 * @param context the FLYSContext.
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72 */
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73 protected void configureTransitions(Document config, FLYSContext context) {
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74 TransitionEngine engine = new TransitionEngine();
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75
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76 Document[] artifacts = getArtifactConfigurations(config);
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77 logger.info("Found " + artifacts.length + " artifacts in the config.");
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78
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79 for (Document doc: artifacts) {
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80 List<Transition> transitions = new ArrayList<Transition>();
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81
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82 String artName = (String) XMLUtils.xpath(
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83 doc, XPATH_ARTIFACT_NAME, XPathConstants.STRING);
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84
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85 NodeList transitionList = (NodeList) XMLUtils.xpath(
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86 doc, XPATH_TRANSITIONS, XPathConstants.NODESET);
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87
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88 if (transitionList == null) {
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89 logger.warn("The artifact has no transitions configured.");
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90 return;
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91 }
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92
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93 int trans = transitionList.getLength();
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94
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95 logger.info(
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96 "Artifact '" + artName + "' has " + trans + " transitions.");
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97
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98 for (int i = 0; i < trans; i++) {
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99 transitions.add(TransitionFactory.createTransition(
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100 transitionList.item(i)));
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101 }
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102
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103 engine.addTransition(artName, transitions);
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104 }
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105
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106 context.put(FLYSContext.TRANSITION_ENGINE_KEY, engine);
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107 }
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108
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109
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110 /**
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111 * This method returns all artifact documents defined in
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112 * <code>config</code>. <br>NOTE: The artifact configurations need to be
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113 * stored in own files referenced by an xlink.
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114 *
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115 * @param config The global configuration.
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116 *
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117 * @return an array of Artifact configurations.
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118 */
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119 protected Document[] getArtifactConfigurations(Document config) {
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120 NodeList artifacts = (NodeList) XMLUtils.xpath(
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121 config, XPATH_ARTIFACTS, XPathConstants.NODESET);
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122
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123 int count = artifacts.getLength();
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124
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125 Document[] artifactDocs = new Document[count];
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126
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127 for (int i = 0; i < count; i++) {
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128 Element tmp = (Element) artifacts.item(i);
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129
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130 String xlink = tmp.getAttribute(XPATH_XLINK);
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131 xlink = Config.replaceConfigDir(xlink);
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132
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133 File artifactFile = new File(xlink);
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134 artifactDocs[i] = XMLUtils.parseDocument(artifactFile);
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135 }
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136
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137 return artifactDocs;
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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