Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/FLYSArtifact.java @ 121:e0ded17a4846
Implemented the feed() operation.
flys-artifacts/trunk@1442 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 09 Mar 2011 14:13:57 +0000 |
parents | 84c0b151203e |
children | d3b8b0b1d010 |
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 |
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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.Node; |
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14 import org.w3c.dom.NodeList; |
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15 |
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16 import de.intevation.artifacts.ArtifactFactory; |
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17 import de.intevation.artifacts.CallContext; |
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18 |
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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20 import de.intevation.artifacts.common.utils.XMLUtils; |
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21 |
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22 import de.intevation.artifactdatabase.DefaultArtifact; |
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23 import de.intevation.artifactdatabase.data.DefaultStateData; |
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24 import de.intevation.artifactdatabase.data.StateData; |
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25 import de.intevation.artifactdatabase.state.State; |
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26 import de.intevation.artifactdatabase.state.StateEngine; |
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27 |
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28 import de.intevation.flys.artifacts.context.FLYSContext; |
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29 |
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30 |
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31 /** |
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32 * The defaul FLYS artifact. |
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33 * |
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34 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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35 */ |
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36 public abstract class FLYSArtifact extends DefaultArtifact { |
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37 |
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38 /** The logger that is used in this artifact.*/ |
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39 private static Logger logger = Logger.getLogger(FLYSArtifact.class); |
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40 |
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41 |
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42 /** The XPath that points to the input data elements of the FEED document.*/ |
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43 public static final String XPATH_FEED_INPUT = |
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44 "/art:action/art:data/art:input"; |
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45 |
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46 |
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47 /** The identifier of the current state. */ |
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48 protected String currentStateId; |
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49 |
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50 /** The name of the artifact.*/ |
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51 protected String name; |
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52 |
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53 /** The data that have been inserted into this artifact.*/ |
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54 protected Map<String, StateData> data; |
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55 |
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56 |
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57 /** |
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58 * The default constructor that creates an empty FLYSArtifact. |
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59 */ |
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60 public FLYSArtifact() { |
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61 data = new HashMap<String, StateData>(); |
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62 } |
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63 |
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64 |
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65 /** |
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66 * Returns the name of the concrete artifact. |
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67 * |
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68 * @return the name of the concrete artifact. |
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69 */ |
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70 public abstract String getName(); |
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71 |
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72 |
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73 /** |
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74 * Returns the FLYSContext from context object. |
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75 * |
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76 * @param context The CallContext or the FLYSContext. |
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77 * |
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78 * @return the FLYSContext. |
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79 */ |
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80 protected FLYSContext getFlysContext(Object context) { |
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81 return context instanceof FLYSContext |
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82 ? (FLYSContext) context |
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83 : (FLYSContext) ((CallContext) context).globalContext(); |
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84 } |
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85 |
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86 |
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87 /** |
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88 * Initialize the artifact and insert new data if <code>data</code> contains |
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89 * information necessary for this artifact. |
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90 * |
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91 * @param identifier The UUID. |
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92 * @param factory The factory that is used to create this artifact. |
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93 * @param context The CallContext. |
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94 * @param data Some optional data. |
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95 */ |
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96 @Override |
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97 public void setup( |
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98 String identifier, |
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99 ArtifactFactory factory, |
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100 Object context, |
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101 Document data) |
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102 { |
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103 logger.debug("Setup this artifact with the uuid: " + identifier); |
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104 |
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105 super.setup(identifier, factory, context, data); |
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106 |
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107 FLYSContext flysContext = (FLYSContext) context; |
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108 StateEngine engine = (StateEngine) flysContext.get( |
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109 FLYSContext.STATE_ENGINE_KEY); |
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110 |
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111 String name = getName(); |
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112 |
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113 logger.debug("Set initial state for artifact '" + name + "'"); |
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114 List<State> states = engine.getStates(name); |
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115 |
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116 setCurrentState(states.get(0)); |
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117 } |
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118 |
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119 |
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120 /** |
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121 * Insert new data included in <code>input</code> into the current state. |
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122 * |
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123 * @param target XML document that contains new data. |
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124 * @param context The CallContext. |
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125 * |
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126 * @return a document that contains a SUCCESS or FAILURE message. |
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127 */ |
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128 @Override |
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129 public Document feed(Document target, CallContext context) { |
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130 Document doc = XMLUtils.newDocument(); |
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131 |
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132 XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator( |
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133 doc, |
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134 ArtifactNamespaceContext.NAMESPACE_URI, |
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135 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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136 |
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137 Element result = creator.create("result"); |
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138 doc.appendChild(result); |
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139 |
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140 try { |
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141 saveData(target, XPATH_FEED_INPUT); |
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142 creator.addAttr(result, "type", "SUCCESS", true); |
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143 } |
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144 catch (IllegalArgumentException iae) { |
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145 creator.addAttr(result, "type", "FAILURE", true); |
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146 |
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147 // TODO I18N this message - getMessage() returns a lookup string, no |
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148 // human readable error message |
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149 result.setTextContent(iae.getMessage()); |
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150 } |
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151 |
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152 return doc; |
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153 } |
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154 |
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155 |
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156 /** |
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157 * Returns the identifier of the current state. |
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158 * |
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159 * @return the identifier of the current state. |
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160 */ |
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161 protected String getCurrentStateId() { |
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162 return currentStateId; |
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163 } |
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164 |
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165 |
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166 /** |
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167 * Sets the identifier of the current state. |
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168 * |
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169 * @param id the identifier of a state. |
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170 */ |
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171 protected void setCurrentStateId(String id) { |
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172 currentStateId = id; |
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173 } |
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174 |
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175 |
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176 /** |
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177 * Set the current state of this artifact. <b>NOTE</b>We don't store the |
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178 * State object itself - which is not necessary - but its identifier. So |
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179 * this method will just call the setCurrentStateId() method with the |
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180 * identifier of <i>state</i>. |
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181 * |
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182 * @param state The new current state. |
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183 */ |
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184 protected void setCurrentState(State state) { |
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185 setCurrentStateId(state.getID()); |
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186 } |
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187 |
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188 |
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189 /** |
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190 * Returns the current state of the artifact. |
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191 * |
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192 * @return the current State of the artifact. |
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193 */ |
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194 protected State getCurrentState(Object context) { |
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195 FLYSContext flysContext = getFlysContext(context); |
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196 StateEngine engine = (StateEngine) flysContext.get( |
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197 FLYSContext.STATE_ENGINE_KEY); |
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198 |
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199 return engine.getState(getCurrentStateId()); |
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200 } |
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201 |
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202 |
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203 /** |
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204 * Adds a new StateData item to the data pool of this artifact. |
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205 * |
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206 * @param name the name of the data object. |
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207 * @param data the data object itself. |
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208 */ |
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209 protected void addData(String name, StateData data) { |
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210 this.data.put(name, data); |
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211 } |
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212 |
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213 |
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214 /** |
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215 * This method stores the data that is contained in the FEED document. |
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216 * |
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217 * @param feed The FEED document. |
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218 * @param xpath The XPath that points to the data nodes. |
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219 */ |
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220 public void saveData(Document feed, String xpath) |
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221 throws IllegalArgumentException |
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222 { |
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223 if (feed == null || xpath == null || xpath.length() == 0) { |
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224 throw new IllegalArgumentException("feed.no.input.data"); |
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225 } |
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226 |
121
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227 NodeList nodes = (NodeList) XMLUtils.xpath( |
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228 feed, |
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229 xpath, |
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230 XPathConstants.NODESET, |
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231 ArtifactNamespaceContext.INSTANCE); |
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232 |
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233 if (nodes == null || nodes.getLength() == 0) { |
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234 throw new IllegalArgumentException("feed.no.input.data"); |
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235 } |
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236 |
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237 int count = nodes.getLength(); |
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238 logger.debug("Try to save " + count + " data items."); |
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239 |
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240 for (int i = 0; i < count; i++) { |
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241 Node node = nodes.item(i); |
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242 |
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243 String name = XMLUtils.xpathString( |
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244 node, "@art:name", ArtifactNamespaceContext.INSTANCE); |
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245 String value = XMLUtils.xpathString( |
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246 node, "@art:value", ArtifactNamespaceContext.INSTANCE); |
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247 |
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248 if (name != null && value != null) { |
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249 logger.debug("Save data item for '" + name + "' : " + value); |
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250 |
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251 // TODO ADD INPUT VALIDATION! |
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252 addData(name, new DefaultStateData(name, null, null, value)); |
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253 } |
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254 } |
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255 } |
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256 } |
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257 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |