Mercurial > dive4elements > framework

annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/ClientProtocolUtils.java @ 114:19b86e27d0c3

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New XPath constants and methods that retrieve important nodes of the DESCRIBE document. artifacts/trunk@1328 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 18 Feb 2011 14:21:32 +0000
parents 0344a20f8a93
children 8ce06db80857
rev   line source
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0344a20f8a93 Added the ArtifactNamespaceContext and a ClientProtocolUtils that helps working with the artifact protocol.
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1 /*
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2 * Copyright (c) 2011 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8 package de.intevation.artifacts.common.utils;
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9
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10 import javax.xml.xpath.XPathConstants;
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11
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12 import org.w3c.dom.Document;
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13 import org.w3c.dom.Element;
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14 import org.w3c.dom.Node;
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15 import org.w3c.dom.NodeList;
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16
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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18
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19
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20 /**
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21 * This class provides methods that help creating the artifact protocol
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22 * documents DESCRIBE, FEED, ADVANCE and OUT.
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23 *
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24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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25 */
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26 public class ClientProtocolUtils {
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27
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28 /** The XPath to the current state in the DESCRIBE document.*/
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29 public static final String XPATH_CURRENT_STATE = "/art:result/art:state";
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30
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31 /** The XPath to the static UI part in the DESCRIBE document.*/
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32 public static final String XPATH_STATIC = "/art:result/art:ui/art:static";
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33
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34 /** The XPath to the dynamic UI part in the DESCRIBE document.*/
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35 public static final String XPATH_DYNAMIC = "/art:result/art:ui/art:dynamic";
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36
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37 /** The XPath to the reachable states part in the DESCRIBE document.*/
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38 public static final String XPATH_STATES =
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39 "/art:result/art:reachable-states";
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40
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41 /** The XPath to the select node relative to the dynamic UI node in the
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42 * DESCRIBE document.*/
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43 public static final String XPATH_DATA_SELECT = "art:select";
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44
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45 /** The XPath to the choices nodes relative to the select node in the
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46 * DESCRIBE document.*/
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47 public static final String XPATH_DATA_ITEMS = "art:choices/art:item";
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48
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49 /** The XPath to a label in the artifact's DESCRIBE document.*/
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50 public static final String XPATH_LABEL = "art:label/text()";
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51
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52 /** The XPath to a value in the artifact's DESCRIBE document.*/
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53 public static final String XPATH_VALUE = "art:value/text()";
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54
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55
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56 /**
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57 * It should not be necessary to create instances of this class.
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58 */
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59 private ClientProtocolUtils() {
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60 }
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61
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62
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63 /**
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64 * This method creates a new CREATE document.
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65 *
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66 * @return the CREATE document.
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67 */
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68 public static Document newCreateDocument(String factory) {
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69 Document doc = XMLUtils.newDocument();
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70
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71 XMLUtils.ElementCreator cr = new XMLUtils.ElementCreator(
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72 doc,
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73 ArtifactNamespaceContext.NAMESPACE_URI,
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74 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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75
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76 Element action = cr.create("action");
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77 Element type = cr.create("type");
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78 Element fac = cr.create("factory");
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79
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80 type.setAttribute("name", "create");
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81 fac.setAttribute("name", factory);
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82
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83 action.appendChild(type);
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84 action.appendChild(fac);
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85
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86 doc.appendChild(action);
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87
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88 return doc;
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89 }
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91
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92 /**
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93 * Returns string value found by {@link XPATH_LABEL} relative to
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94 * <i>node</i>.
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95 *
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96 * @param node A node.
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97 *
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98 * @return the string value found by {@link XPATH_LABEL}.
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99 */
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100 public static String getLabel(Node node) {
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101 return (String) XMLUtils.xpath(
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102 node,
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103 XPATH_LABEL,
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104 XPathConstants.STRING,
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105 ArtifactNamespaceContext.INSTANCE);
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106 }
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107
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108
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109 /**
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110 * Returns string value found by {@link XPATH_VALUE} relative to
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111 * <i>node</i>.
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112 *
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113 * @param node A node.
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114 *
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115 * @return the string value found by {@link XPATH_VALUE}.
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116 */
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117 public static String getValue(Node node) {
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118 return (String) XMLUtils.xpath(
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119 node,
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120 XPATH_VALUE,
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121 XPathConstants.STRING,
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122 ArtifactNamespaceContext.INSTANCE);
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123 }
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124
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125
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126 /**
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127 * This method returns the static UI part of the artifact's DESCRIBE
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128 * document.
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129 *
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130 * @param description The document returned by the artifact server's
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131 * DESCRIBE operation.
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132 *
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133 * @return the static UI node.
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134 */
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135 public static Node getStaticUI(Document description) {
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136 return (Node) XMLUtils.xpath(
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137 description,
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138 XPATH_STATIC,
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139 XPathConstants.NODE,
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140 ArtifactNamespaceContext.INSTANCE);
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141 }
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142
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143
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144 /**
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145 * This method returns the dynamic UI part of the artifact's DESCRIBE
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146 * document.
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147 *
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148 * @param description The document returned by the artifact server's
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149 * DESCRIBE operation.
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150 *
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151 * @return the dynamic UI node.
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152 */
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153 public static Node getDynamicUI(Document description) {
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154 return (Node) XMLUtils.xpath(
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155 description,
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156 XPATH_DYNAMIC,
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157 XPathConstants.NODE,
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158 ArtifactNamespaceContext.INSTANCE);
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159 }
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160
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161
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162 /**
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163 * This method returns the current state node contained in the DESCRIBE
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164 * document.
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165 *
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166 * @param description The document returned by the artifact server's
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167 * DESCRIBE operation.
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168 *
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169 * @return the node containing information about the current state.
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170 */
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171 public static Node getCurrentState(Document description) {
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172 return (Node) XMLUtils.xpath(
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173 description,
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174 XPATH_CURRENT_STATE,
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175 XPathConstants.NODE,
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176 ArtifactNamespaceContext.INSTANCE);
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177 }
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178
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179
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180 /**
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181 * This method returns the node that contains information about the
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182 * reachable states of the artifact in the artifact's DESCRIBE document.
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183 *
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184 * @param description The document returned by the artifact server's
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185 * DESCRIBE operation.
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186 *
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187 * @return the node that contains the reachable states.
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188 */
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189 public static Node getReachableStates(Document description) {
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190 return (Node) XMLUtils.xpath(
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191 description,
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192 XPATH_STATES,
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193 XPathConstants.NODE,
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194 ArtifactNamespaceContext.INSTANCE);
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195 }
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196
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197
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198 /**
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199 * Returns the node found by {@link XPATH_DATA_SELECT}.
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200 *
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201 * @param dynamicNode The dynamic UI node of the DESCRIBE document.
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202 *
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203 * @return the select node found in the dynamic UI node.
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204 */
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205 public static Node getSelectNode(Node dynamicNode) {
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206 return (Node) XMLUtils.xpath(
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207 dynamicNode,
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208 XPATH_DATA_SELECT,
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209 XPathConstants.NODE,
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210 ArtifactNamespaceContext.INSTANCE);
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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 * Returns the items that could be found in the <i>node</i>.
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216 *
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217 * @param node A select node.
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218 *
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219 * @return the choices nodes as node list.
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220 */
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221 public static NodeList getItemNodes(Node node) {
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222 return (NodeList) XMLUtils.xpath(
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223 node,
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224 XPATH_DATA_ITEMS,
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225 XPathConstants.NODESET,
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226 ArtifactNamespaceContext.INSTANCE);
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227 }
113
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228 }
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229 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org