Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/FLYSArtifact.java @ 317:8f40a57229c3
FLYSArtifact provides methods to retrieve the real River, Gauge objects.
flys-artifacts/trunk@1704 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 15 Apr 2011 13:37:51 +0000 |
parents | fc694a43a7e5 |
children | a8e7c351bdf1 |
rev | line source |
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1 package de.intevation.flys.artifacts; |
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2 |
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3 import java.util.HashMap; |
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4 import java.util.List; |
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5 import java.util.Map; |
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6 import java.util.Set; |
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7 import java.util.Vector; |
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8 |
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9 import javax.xml.xpath.XPathConstants; |
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10 |
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11 import org.apache.log4j.Logger; |
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12 |
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13 import org.w3c.dom.Document; |
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14 import org.w3c.dom.Element; |
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15 import org.w3c.dom.Node; |
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16 import org.w3c.dom.NodeList; |
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17 |
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18 import de.intevation.artifacts.ArtifactFactory; |
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19 import de.intevation.artifacts.CallContext; |
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20 |
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21 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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22 import de.intevation.artifacts.common.utils.XMLUtils; |
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23 |
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24 import de.intevation.artifactdatabase.DefaultArtifact; |
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25 import de.intevation.artifactdatabase.data.DefaultStateData; |
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26 import de.intevation.artifactdatabase.data.StateData; |
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27 import de.intevation.artifactdatabase.state.State; |
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28 import de.intevation.artifactdatabase.state.StateEngine; |
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29 import de.intevation.artifactdatabase.transition.TransitionEngine; |
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30 |
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31 import de.intevation.flys.model.Gauge; |
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32 import de.intevation.flys.model.River; |
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33 |
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34 import de.intevation.flys.artifacts.context.FLYSContext; |
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35 import de.intevation.flys.artifacts.model.RiverFactory; |
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36 |
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37 |
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38 /** |
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39 * The defaul FLYS artifact. |
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40 * |
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41 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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42 */ |
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43 public abstract class FLYSArtifact extends DefaultArtifact { |
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44 |
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45 /** The logger that is used in this artifact.*/ |
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46 private static Logger logger = Logger.getLogger(FLYSArtifact.class); |
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47 |
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48 |
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49 /** The XPath that points to the input data elements of the FEED document.*/ |
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50 public static final String XPATH_FEED_INPUT = |
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51 "/art:action/art:data/art:input"; |
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52 |
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53 /** The XPath that points to the name of the target state of ADVANCE.*/ |
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54 public static final String XPATH_ADVANCE_TARGET = |
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55 "/art:action/art:target/@art:name"; |
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56 |
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57 /** The constant string that shows that an operation was successful.*/ |
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58 public static final String OPERATION_SUCCESSFUL = "SUCCESS"; |
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59 |
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60 /** The constant string that shows that an operation failed.*/ |
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61 public static final String OPERATION_FAILED = "FAILURE"; |
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62 |
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63 |
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64 /** The identifier of the current state. */ |
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65 protected String currentStateId; |
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66 |
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67 /** The identifiers of previous states on a stack.*/ |
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68 protected Vector<String> previousStateIds; |
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69 |
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70 /** The name of the artifact.*/ |
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71 protected String name; |
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72 |
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73 /** The data that have been inserted into this artifact.*/ |
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74 protected Map<String, StateData> data; |
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75 |
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76 |
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77 /** |
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78 * The default constructor that creates an empty FLYSArtifact. |
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79 */ |
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80 public FLYSArtifact() { |
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81 data = new HashMap<String, StateData>(); |
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82 previousStateIds = new Vector<String>(); |
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83 } |
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84 |
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85 |
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86 /** |
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87 * Returns the name of the concrete artifact. |
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88 * |
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89 * @return the name of the concrete artifact. |
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90 */ |
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91 public abstract String getName(); |
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92 |
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93 |
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94 /** |
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95 * Returns the FLYSContext from context object. |
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96 * |
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97 * @param context The CallContext or the FLYSContext. |
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98 * |
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99 * @return the FLYSContext. |
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100 */ |
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101 protected FLYSContext getFlysContext(Object context) { |
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102 return context instanceof FLYSContext |
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103 ? (FLYSContext) context |
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104 : (FLYSContext) ((CallContext) context).globalContext(); |
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105 } |
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106 |
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107 |
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108 /** |
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109 * Initialize the artifact and insert new data if <code>data</code> contains |
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110 * information necessary for this artifact. |
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111 * |
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112 * @param identifier The UUID. |
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113 * @param factory The factory that is used to create this artifact. |
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114 * @param context The CallContext. |
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115 * @param data Some optional data. |
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116 */ |
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117 @Override |
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118 public void setup( |
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119 String identifier, |
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120 ArtifactFactory factory, |
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121 Object context, |
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122 Document data) |
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123 { |
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124 logger.debug("Setup this artifact with the uuid: " + identifier); |
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125 |
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126 super.setup(identifier, factory, context, data); |
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127 |
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128 FLYSContext flysContext = (FLYSContext) context; |
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129 StateEngine engine = (StateEngine) flysContext.get( |
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130 FLYSContext.STATE_ENGINE_KEY); |
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131 |
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132 String name = getName(); |
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133 |
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134 logger.debug("Set initial state for artifact '" + name + "'"); |
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135 List<State> states = engine.getStates(name); |
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136 |
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137 setCurrentState(states.get(0)); |
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138 } |
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139 |
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140 |
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141 /** |
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142 * Insert new data included in <code>input</code> into the current state. |
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143 * |
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144 * @param target XML document that contains new data. |
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145 * @param context The CallContext. |
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146 * |
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147 * @return a document that contains a SUCCESS or FAILURE message. |
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148 */ |
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149 @Override |
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150 public Document feed(Document target, CallContext context) { |
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151 logger.info("FLYSArtifact.feed()"); |
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152 |
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153 Document doc = XMLUtils.newDocument(); |
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154 |
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155 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator( |
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156 doc, |
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157 ArtifactNamespaceContext.NAMESPACE_URI, |
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158 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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159 |
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160 Element result = creator.create("result"); |
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161 doc.appendChild(result); |
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162 |
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163 try { |
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164 saveData(target, XPATH_FEED_INPUT); |
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165 return describe(target, context); |
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166 } |
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167 catch (IllegalArgumentException iae) { |
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168 creator.addAttr(result, "type", OPERATION_FAILED, true); |
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169 |
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170 // TODO I18N this message - getMessage() returns a lookup string, no |
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171 // human readable error message |
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172 result.setTextContent(iae.getMessage()); |
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173 } |
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174 |
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175 return doc; |
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176 } |
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177 |
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178 |
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179 /** |
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180 * This method handles request for changing the current state of an |
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181 * artifact. It is possible to step forward or backward. |
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182 * |
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183 * @param target The incoming ADVANCE document. |
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184 * @param context The CallContext. |
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185 * |
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186 * @return a document that contains a SUCCESS or FAILURE message. |
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187 */ |
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188 public Document advance(Document target, CallContext context) { |
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189 Document doc = XMLUtils.newDocument(); |
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190 |
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191 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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192 doc, |
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193 ArtifactNamespaceContext.NAMESPACE_URI, |
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194 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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195 |
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196 Element result = ec.create("result"); |
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197 |
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198 String targetState = XMLUtils.xpathString( |
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199 target, XPATH_ADVANCE_TARGET, ArtifactNamespaceContext.INSTANCE); |
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200 |
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201 logger.info("FLYSArtifact.advance() to '" + targetState + "'"); |
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202 |
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203 if (isStateReachable(targetState, context)) { |
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204 logger.info("Advance: Step forward"); |
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205 |
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206 Vector<String> prev = getPreviousStateIds(); |
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207 prev.add(getCurrentStateId()); |
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208 |
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209 setCurrentStateId(targetState); |
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210 |
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211 return describe(target, context); |
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212 } |
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213 else if (isPreviousState(targetState, context)) { |
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214 logger.info("Advance: Step back to"); |
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215 |
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216 Vector<String> prevs = getPreviousStateIds(); |
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217 int targetIdx = prevs.indexOf(targetState); |
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218 int start = prevs.size() - 1; |
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219 |
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220 for (int i = start; i >= targetIdx; i--) { |
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221 String prev = prevs.get(i); |
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222 logger.debug("Remove state id '" + prev + "'"); |
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223 prevs.remove(prev); |
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224 } |
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225 |
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226 setCurrentStateId(targetState); |
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227 |
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228 return describe(target, context); |
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229 } |
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230 |
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231 logger.warn("Advance: Cannot advance to '" + targetState + "'"); |
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232 ec.addAttr(result, "type", OPERATION_FAILED, true); |
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233 |
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234 doc.appendChild(result); |
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235 |
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236 return doc; |
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237 } |
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238 |
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239 |
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240 /** |
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241 * Returns the identifier of the current state. |
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242 * |
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243 * @return the identifier of the current state. |
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244 */ |
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245 protected String getCurrentStateId() { |
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246 return currentStateId; |
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247 } |
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248 |
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249 |
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250 /** |
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251 * Sets the identifier of the current state. |
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252 * |
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253 * @param id the identifier of a state. |
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254 */ |
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255 protected void setCurrentStateId(String id) { |
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256 currentStateId = id; |
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257 } |
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258 |
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259 |
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260 /** |
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261 * Set the current state of this artifact. <b>NOTE</b>We don't store the |
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262 * State object itself - which is not necessary - but its identifier. So |
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263 * this method will just call the setCurrentStateId() method with the |
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264 * identifier of <i>state</i>. |
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265 * |
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266 * @param state The new current state. |
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267 */ |
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268 protected void setCurrentState(State state) { |
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269 setCurrentStateId(state.getID()); |
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270 } |
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271 |
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272 |
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273 /** |
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274 * Returns the current state of the artifact. |
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275 * |
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276 * @return the current State of the artifact. |
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277 */ |
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278 protected State getCurrentState(Object context) { |
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279 FLYSContext flysContext = getFlysContext(context); |
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280 StateEngine engine = (StateEngine) flysContext.get( |
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281 FLYSContext.STATE_ENGINE_KEY); |
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282 |
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283 return engine.getState(getCurrentStateId()); |
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284 } |
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285 |
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286 |
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287 /** |
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288 * Returns the vector of previous state identifiers. |
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289 * |
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290 * @return the vector of previous state identifiers. |
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291 */ |
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292 protected Vector<String> getPreviousStateIds() { |
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293 return previousStateIds; |
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294 } |
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295 |
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296 |
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297 /** |
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298 * Adds a new StateData item to the data pool of this artifact. |
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299 * |
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300 * @param name the name of the data object. |
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301 * @param data the data object itself. |
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302 */ |
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303 protected void addData(String name, StateData data) { |
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304 this.data.put(name, data); |
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305 } |
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306 |
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307 |
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308 /** |
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309 * This method returns a specific StateData object that is stored in the |
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310 * data pool of this artifact. |
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311 * |
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312 * @param name The name of the data object. |
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313 * |
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314 * @return the StateData object if existing, otherwise null. |
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315 */ |
298
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316 public StateData getData(String name) { |
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317 return data.get(name); |
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318 } |
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319 |
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320 |
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321 /** |
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322 * This method stores the data that is contained in the FEED document. |
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323 * |
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324 * @param feed The FEED document. |
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325 * @param xpath The XPath that points to the data nodes. |
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326 */ |
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327 public void saveData(Document feed, String xpath) |
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328 throws IllegalArgumentException |
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329 { |
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330 if (feed == null || xpath == null || xpath.length() == 0) { |
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331 throw new IllegalArgumentException("feed.no.input.data"); |
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332 } |
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333 |
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334 NodeList nodes = (NodeList) XMLUtils.xpath( |
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335 feed, |
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336 xpath, |
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337 XPathConstants.NODESET, |
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338 ArtifactNamespaceContext.INSTANCE); |
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339 |
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340 if (nodes == null || nodes.getLength() == 0) { |
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341 throw new IllegalArgumentException("feed.no.input.data"); |
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342 } |
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343 |
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344 int count = nodes.getLength(); |
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345 logger.debug("Try to save " + count + " data items."); |
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346 |
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347 for (int i = 0; i < count; i++) { |
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348 Node node = nodes.item(i); |
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349 |
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350 String name = XMLUtils.xpathString( |
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351 node, "@art:name", ArtifactNamespaceContext.INSTANCE); |
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352 String value = XMLUtils.xpathString( |
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353 node, "@art:value", ArtifactNamespaceContext.INSTANCE); |
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354 |
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355 if (name != null && value != null) { |
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356 logger.debug("Save data item for '" + name + "' : " + value); |
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357 |
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358 // TODO ADD INPUT VALIDATION! |
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359 addData(name, new DefaultStateData(name, null, null, value)); |
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360 } |
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361 } |
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362 } |
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363 |
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364 |
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365 /** |
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366 * This method fills a state object with the data that have been inserted to |
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367 * this artifact. This is necessary to use the isStateReachable() method, |
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368 * because the Transitions need to know about the inserted data. |
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369 * |
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370 * @param state The state that needs to be filled with data. |
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371 * |
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372 * @return the filled state. |
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373 */ |
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374 protected State fillState(State state) { |
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375 Map<String, StateData> stateData = state.getData(); |
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376 |
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377 if (stateData == null) { |
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378 return state; |
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379 } |
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380 |
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381 Set<String> keys = stateData.keySet(); |
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382 |
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383 for (String key: keys) { |
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384 StateData tmp = getData(key); |
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385 |
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386 if (tmp != null) { |
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387 StateData data = stateData.get(key); |
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388 data.setValue(tmp.getValue()); |
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389 } |
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390 } |
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391 |
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392 return state; |
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393 } |
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394 |
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395 |
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396 /** |
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397 * Determines if the state with the identifier <i>stateId</i> is reachable |
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398 * from the current state. The determination itself takes place in the |
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399 * TransitionEngine. |
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400 * |
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401 * @param stateId The identifier of a state. |
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402 * @param context The context object. |
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403 * |
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404 * @return true, if the state specified by <i>stateId</i> is reacahble, |
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405 * otherwise false. |
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406 */ |
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407 protected boolean isStateReachable(String stateId, Object context) { |
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408 logger.debug("Determine if the state '" + stateId + "' is reachable."); |
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409 |
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410 FLYSContext flysContext = getFlysContext(context); |
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411 |
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412 State currentState = fillState(getCurrentState(context)); |
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413 StateEngine sEngine = (StateEngine) flysContext.get( |
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414 FLYSContext.STATE_ENGINE_KEY); |
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415 |
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416 TransitionEngine tEngine = (TransitionEngine) flysContext.get( |
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417 FLYSContext.TRANSITION_ENGINE_KEY); |
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418 |
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419 return tEngine.isStateReachable(stateId, currentState, sEngine); |
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420 } |
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421 |
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422 |
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423 /** |
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424 * Determines if the state with the identifier <i>stateId</i> is a previous |
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425 * state of the current state. |
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426 * |
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427 * @param stateId The target state identifier. |
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428 * @param context The context object. |
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429 */ |
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430 protected boolean isPreviousState(String stateId, Object context) { |
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431 logger.debug("Determine if the state '" + stateId + "' is old."); |
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432 |
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433 Vector<String> prevs = getPreviousStateIds(); |
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434 if (prevs.contains(stateId)) { |
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435 return true; |
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436 } |
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437 |
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438 return false; |
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439 } |
317
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440 |
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441 |
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442 /** |
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443 * Returns the selected River object based on the 'river' data that might |
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444 * have been inserted by the user. |
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445 * |
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446 * @return the selected River or null if no river has been chosen yet. |
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447 */ |
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448 public River getRiver() { |
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449 StateData dRiver = getData("river"); |
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450 |
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451 return dRiver != null |
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452 ? RiverFactory.getRiver((String) dRiver.getValue()) |
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453 : null; |
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454 } |
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455 |
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456 |
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457 /** |
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458 * Returns the selected distance of points. |
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459 * |
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460 * @return the selected distance or points. |
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461 */ |
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462 public double[] getDistance() { |
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463 StateData dFrom = getData("ld_from"); |
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464 StateData dTo = getData("ld_to"); |
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465 |
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466 double from = Double.parseDouble((String) dFrom.getValue()); |
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467 double to = Double.parseDouble((String) dTo.getValue()); |
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468 |
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469 // TODO take point selection into account |
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470 |
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471 return new double[] { from, to }; |
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472 } |
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473 |
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474 |
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475 /** |
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476 * Returns the gauge based on the current distance and river. |
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477 * |
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478 * @return the gauge. |
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479 */ |
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480 public Gauge getGauge() { |
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481 River river = getRiver(); |
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482 double[] dist = getDistance(); |
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483 |
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484 if (logger.isDebugEnabled()) { |
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485 logger.debug("Determine gauge for:"); |
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486 logger.debug("... river: " + river.getName()); |
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487 logger.debug("... distance: " + dist[0] + " - " + dist[1]); |
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488 } |
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489 |
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490 List<Gauge> gauges = river.getGauges(); |
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491 |
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492 // TODO Search the desired gauge! |
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493 return gauges.get(0); |
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494 } |
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495 } |
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496 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |