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annotate flys-client/src/main/java/de/intevation/flys/client/server/ArtifactDescriptionFactory.java @ 34:bf84bcd4e11b

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Parse static data from DESCRIBE. flys-client/trunk@1454 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 10 Mar 2011 13:40:29 +0000
parents 88c530c25968
children b6b89ff1adee
rev   line source
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f8a5f2c5e2b7 The DESCRIBE document returned by the artifact server is parsed after calling create() of the artifact service and a new Artifact is created with an ArtifactDescription that contains the UUID, HASH, und the current Data.
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1 package de.intevation.flys.client.server;
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3 import java.util.ArrayList;
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4 import java.util.List;
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6 import javax.xml.xpath.XPathConstants;
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Node;
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10 import org.w3c.dom.NodeList;
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12 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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13 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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14 import de.intevation.artifacts.common.utils.XMLUtils;
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16 import de.intevation.flys.client.shared.model.ArtifactDescription;
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17 import de.intevation.flys.client.shared.model.Data;
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18 import de.intevation.flys.client.shared.model.DataItem;
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19 import de.intevation.flys.client.shared.model.DefaultData;
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20 import de.intevation.flys.client.shared.model.DefaultDataItem;
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21 import de.intevation.flys.client.shared.model.DefaultArtifactDescription;
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24 /**
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25 * This factory class helps creating an {@link ArtifactDescription} based on the
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26 * DESCRIBE document of an artifact returned by the artifact server. Use the
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27 * {@link createArtifactDescription(org.w3c.dom.Document)} method with the
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28 * DESCRIBE document to create such an {@link ArtifactDescription}.
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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 ArtifactDescriptionFactory {
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34 public static final String XPATH_STATE_NAME = "@art:name";
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35
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36 public static final String XPATH_UIPROVIDER = "@art:uiprovider";
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38 public static final String XPATH_REACHABLE_STATE = "art:state";
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40 public static final String XPATH_STATIC_DATA_NODE = "art:data";
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42 public static final String XPATH_STATIC_ITEM_NODE = "art:item";
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44 /**
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45 * This method creates the {@link ArtifactDescription} of the DESCRIBE
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46 * document <i>doc</i>.
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47 *
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48 * @param doc A DESCRIBE document.
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49 *
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50 * @return the {@link ArtifactDescription}.
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51 */
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52 public static ArtifactDescription createArtifactDescription(Document doc) {
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53 System.out.println("ArtifactDescriptionFactory - create()");
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55 Node currentState = ClientProtocolUtils.getCurrentState(doc);
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56 Node staticNode = ClientProtocolUtils.getStaticUI(doc);
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57 Node dynamicNode = ClientProtocolUtils.getDynamicUI(doc);
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58 Node reachable = ClientProtocolUtils.getReachableStates(doc);
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60 String state = (String) XMLUtils.xpath(
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61 currentState,
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62 XPATH_STATE_NAME,
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63 XPathConstants.STRING,
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64 ArtifactNamespaceContext.INSTANCE);
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65 System.out.println("Current state name: " + state);
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67 Data currentData = extractCurrentData(dynamicNode);
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68 Data[] old = extractOldData(staticNode);
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69 String[] states = extractReachableStates(reachable);
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71 return new DefaultArtifactDescription(old, currentData, state, states);
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72 }
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75 /**
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76 * This method extracts the data that the user is able to enter in the
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77 * current state of the artifact.
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78 *
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79 * @param dynamicNode The dynamic node of the DESCRIBE document.
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80 *
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81 * @return A {@link Data} object that represents the data which might be
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82 * entered by the user in the current state or null, if no data might be
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83 * entered.
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84 */
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85 protected static Data extractCurrentData(Node dynamicNode) {
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86 System.out.println("ArtifactDescriptionFactory - extractCurrentData()");
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87
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88 Node data = ClientProtocolUtils.getSelectNode(dynamicNode);
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89 NodeList choices = ClientProtocolUtils.getItemNodes(data);
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90 String label = ClientProtocolUtils.getLabel(data);
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91
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92 DataItem[] dataItems = extractCurrentDataItems(choices);
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93 String uiProvider = extractUIProvider(data);
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94
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95 return new DefaultData(label, null, null, dataItems, uiProvider);
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96 }
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97
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98
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99 /**
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100 * This method extract the {@link DataItem}s of the DESCRIBE document.
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101 *
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102 * @param items The items in the DESCRIBE document.
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103 *
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104 * @return the {@link DataItem}s.
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105 */
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106 protected static DataItem[] extractCurrentDataItems(NodeList items) {
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107 System.out.println(
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108 "ArtifactDescriptionFactory - extractCurrentDataItems()");
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109
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110 if (items == null || items.getLength() == 0) {
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111 System.out.println("No data items found.");
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112 return null;
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113 }
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114
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115 int count = items.getLength();
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116
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117 List<DataItem> dataItems = new ArrayList<DataItem>(count);
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118
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119 for (int i = 0; i < count; i++) {
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120 Node item = items.item(i);
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121 String label = ClientProtocolUtils.getLabel(item);
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122 String value = ClientProtocolUtils.getValue(item);
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123
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124 dataItems.add(new DefaultDataItem(label, null, value));
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125 }
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126
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127 return (DataItem[]) dataItems.toArray(new DataItem[count]);
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128 }
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129
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130
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131 /**
34
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132 * This method extracts the data objects from the data node of the static ui
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133 * part of the DESCRIBE document.
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134 *
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135 * @param staticNode The static ui node of the DESCRIBE.
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136 *
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137 * @return the Data objects.
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138 */
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139 protected static Data[] extractOldData(Node staticNode) {
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140 System.out.println("ArtifactDescriptionFactory - extractOldData()");
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141
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142 NodeList dataNodes = (NodeList) XMLUtils.xpath(
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143 staticNode,
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144 XPATH_STATIC_DATA_NODE,
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145 XPathConstants.NODESET,
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146 ArtifactNamespaceContext.INSTANCE);
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147
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148 if (dataNodes == null || dataNodes.getLength() == 0) {
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149 System.out.println("No old items found.");
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150 return null;
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151 }
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152
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153 int count = dataNodes.getLength();
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154
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155 Data[] data = new Data[count];
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156
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157 for (int i = 0; i < count; i++) {
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158 Node tmp = dataNodes.item(i);
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159
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160 String name = XMLUtils.xpathString(
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161 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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162 String type = XMLUtils.xpathString(
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163 tmp, "@art:type", ArtifactNamespaceContext.INSTANCE);
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164
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165 DataItem[] items = extractOldDataItems(tmp);
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166
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167 data[i] = new DefaultData(name, name, type, items, null);
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168 }
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169
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170 return data;
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171 }
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172
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173
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174 /**
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175 * This method extracts the data items from the data nodes that are placed
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176 * in the static ui part of the DESCRIBE document.
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177 *
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178 * @param dataNode A data node that contains items.
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179 *
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180 * @return a list of DataItems.
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181 */
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182 protected static DataItem[] extractOldDataItems(Node dataNode) {
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183 NodeList itemList = (NodeList) XMLUtils.xpath(
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184 dataNode,
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185 XPATH_STATIC_ITEM_NODE,
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186 XPathConstants.NODESET,
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187 ArtifactNamespaceContext.INSTANCE);
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188
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189 if (itemList == null || itemList.getLength() == 0) {
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190 System.out.println("No old data items found.");
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191 return null;
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192 }
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193
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194 int count = itemList.getLength();
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195
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196 DataItem[] items = new DataItem[count];
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197
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198 for (int i = 0; i < count; i++) {
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199 Node tmp = itemList.item(i);
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200
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201 String value = XMLUtils.xpathString(
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202 tmp, "@art:value", ArtifactNamespaceContext.INSTANCE);
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203
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204 // TODO extract the human readable value (description) from node
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205 items[i] = new DefaultDataItem(value, value, value);
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206 }
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207
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208 return items;
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209 }
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210
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211
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212 /**
22
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213 * This method extracts the UIProvider specified by the data node.
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214 *
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215 * @param data The data node.
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216 *
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217 * @return the UIProvider that is specified in the data node.
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218 */
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219 protected static String extractUIProvider(Node data) {
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220 return (String) XMLUtils.xpath(
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221 data,
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222 XPATH_UIPROVIDER,
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223 XPathConstants.STRING,
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224 ArtifactNamespaceContext.INSTANCE);
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225 }
32
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226
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227
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228 /**
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229 * This method extracts the reachable states of the current artifact.
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230 *
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231 * @param reachable The reachable states node.
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232 *
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233 * @return an array with identifiers of reachable states.
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234 */
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235 protected static String[] extractReachableStates(Node reachable) {
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236 System.out.println("ArtifactDescriptionFactory - extractReachableStates()");
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237
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238 NodeList list = (NodeList) XMLUtils.xpath(
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239 reachable,
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240 XPATH_REACHABLE_STATE,
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241 XPathConstants.NODESET,
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242 ArtifactNamespaceContext.INSTANCE);
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243
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244 if (list == null || list.getLength() == 0) {
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245 return null;
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246 }
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247
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248 int count = list.getLength();
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249
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250 String[] states = new String[count];
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251
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252 for (int i = 0; i < count; i++) {
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253 Node state = list.item(i);
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254
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255 String name = XMLUtils.xpathString(
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256 state, "@art:name", ArtifactNamespaceContext.INSTANCE);
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257
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258 states[i] = name;
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259 }
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260
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261 return states;
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262 }
16
f8a5f2c5e2b7 The DESCRIBE document returned by the artifact server is parsed after calling create() of the artifact service and a new Artifact is created with an ArtifactDescription that contains the UUID, HASH, und the current Data.
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263 }
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264 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org