annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/context/FLYSContextFactory.java @ 107:a228b39494a9

Improved the bootstrap process - the states are initialized. flys-artifacts/trunk@1292 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 04 Feb 2011 11:09:11 +0000
parents 5864c41219db
children 7222d8fb53ea
rev   line source
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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 import de.intevation.artifactdatabase.state.State;
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21 import de.intevation.artifactdatabase.state.StateEngine;
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22 import de.intevation.artifactdatabase.transition.Transition;
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23 import de.intevation.artifactdatabase.transition.TransitionEngine;
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24
107
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25 import de.intevation.flys.artifacts.states.StateFactory;
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26 import de.intevation.flys.artifacts.transitions.TransitionFactory;
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27
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28
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29 /**
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30 * The ArtifactContextFactory is used to initialize basic components and put
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31 * them into the global context of the application.
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32 *
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public class FLYSContextFactory implements ArtifactContextFactory {
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36
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37 /** The logger that is used in this class */
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38 private static Logger logger = Logger.getLogger(FLYSContextFactory.class);
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39
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40 /** The XPath to the artifacts configured in the configuration. */
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41 public static final String XPATH_ARTIFACTS =
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42 "/artifact-database/artifacts/artifact";
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43
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44 /** The XPath to the name of the artifact. */
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45 public static final String XPATH_ARTIFACT_NAME = "/artifact/@name";
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46
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47 /** The XPath to the xlink ref in an artifact configuration. */
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48 public static final String XPATH_XLINK = "xlink:href";
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49
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50 /** The XPath to the transitions configured in the artifact config. */
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51 public static final String XPATH_TRANSITIONS =
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52 "/artifact/states/transition";
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53
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54 /** The XPath to the states configured in the artifact config. */
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55 public static final String XPATH_STATES =
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56 "/artifact/states/state";
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57
106
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58 /**
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59 * Creates a new FLYSArtifactContext object and initialize all
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60 * components required by the application.
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61 *
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62 * @param config The artifact server configuration.
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63 * @return a FLYSArtifactContext.
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64 */
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65 public Object createArtifactContext(Document config) {
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66 FLYSContext context = new FLYSContext(config);
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67
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68 configureTransitions(config, context);
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69 configureStates(config, context);
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70
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71 return context;
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72 }
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73
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74
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75 /**
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76 * This method initializes the transition configuration.
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77 *
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78 * @param config the config document.
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79 * @param context the FLYSContext.
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80 */
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81 protected void configureTransitions(Document config, FLYSContext context) {
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82 TransitionEngine engine = new TransitionEngine();
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83
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84 Document[] artifacts = getArtifactConfigurations(config);
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85 logger.info("Found " + artifacts.length + " artifacts in the config.");
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86
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87 for (Document doc: artifacts) {
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88 List<Transition> transitions = new ArrayList<Transition>();
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89
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90 String artName = (String) XMLUtils.xpath(
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91 doc, XPATH_ARTIFACT_NAME, XPathConstants.STRING);
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92
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93 NodeList transitionList = (NodeList) XMLUtils.xpath(
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94 doc, XPATH_TRANSITIONS, XPathConstants.NODESET);
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95
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96 if (transitionList == null) {
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97 logger.warn("The artifact has no transitions configured.");
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98 continue;
106
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99 }
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100
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101 int trans = transitionList.getLength();
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102
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103 logger.info(
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104 "Artifact '" + artName + "' has " + trans + " transitions.");
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105
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106 for (int i = 0; i < trans; i++) {
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107 transitions.add(TransitionFactory.createTransition(
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108 transitionList.item(i)));
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109 }
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110
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111 engine.addTransition(artName, transitions);
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112 }
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113
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114 context.put(FLYSContext.TRANSITION_ENGINE_KEY, engine);
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115 }
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116
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117
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118 /**
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119 * This method returns all artifact documents defined in
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120 * <code>config</code>. <br>NOTE: The artifact configurations need to be
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121 * stored in own files referenced by an xlink.
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122 *
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123 * @param config The global configuration.
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124 *
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125 * @return an array of Artifact configurations.
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126 */
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127 protected Document[] getArtifactConfigurations(Document config) {
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128 NodeList artifacts = (NodeList) XMLUtils.xpath(
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129 config, XPATH_ARTIFACTS, XPathConstants.NODESET);
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130
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131 int count = artifacts.getLength();
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132
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133 Document[] artifactDocs = new Document[count];
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134
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135 for (int i = 0; i < count; i++) {
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136 Element tmp = (Element) artifacts.item(i);
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137
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138 String xlink = tmp.getAttribute(XPATH_XLINK);
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139 xlink = Config.replaceConfigDir(xlink);
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140
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141 File artifactFile = new File(xlink);
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142 artifactDocs[i] = XMLUtils.parseDocument(artifactFile);
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143 }
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144
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145 return artifactDocs;
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146 }
107
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147
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148
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149 /**
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150 * This method initializes the transition configuration.
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151 *
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152 * @param config the config document.
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153 * @param context the FLYSContext.
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154 */
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155 protected void configureStates(Document config, FLYSContext context) {
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156 StateEngine engine = new StateEngine();
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157
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158 Document[] artifacts = getArtifactConfigurations(config);
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159 logger.info("Found " + artifacts.length + " artifacts in the config.");
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160
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161 for (Document doc: artifacts) {
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162 List<State> states = new ArrayList<State>();
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163
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164 String artName = (String) XMLUtils.xpath(
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165 doc, XPATH_ARTIFACT_NAME, XPathConstants.STRING);
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166
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167 NodeList stateList = (NodeList) XMLUtils.xpath(
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168 doc, XPATH_STATES, XPathConstants.NODESET);
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169
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170 if (stateList == null) {
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171 logger.warn("The artifact has no states configured.");
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172 continue;
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173 }
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174
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175 int count = stateList.getLength();
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176
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177 logger.info(
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178 "Artifact '" + artName + "' has " + count + " states.");
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179
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180 for (int i = 0; i < count; i++) {
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181 states.add(StateFactory.createState(
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182 stateList.item(i)));
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183 }
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184
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185 engine.addStates(artName, states);
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186 }
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187
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188 context.put(FLYSContext.STATE_ENGINE_KEY, engine);
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189 }
106
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190 }
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191 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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