Mercurial > repos > ganjoo > webservice_toolsuite

annotate WebServiceToolWorkflow/lib/SAWADLParser/src/edu/uga/cs/lsdis/meteors/wadls/util/xml/XPathUtils.java @ 0:d5cd409b8a18 default tip

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Migrated tool version 1.0.0 from old tool shed archive to new tool shed repository
author ganjoo
date Tue, 07 Jun 2011 18:00:50 -0400
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d5cd409b8a18 Migrated tool version 1.0.0 from old tool shed archive to new tool shed repository
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1 /*
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2 * (c) Copyright IBM Corp 2001, 2005
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3 */
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4
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5 package edu.uga.cs.lsdis.meteors.wadls.util.xml;
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6
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7 import java.util.Vector;
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8 import org.w3c.dom.*;
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9
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10 /**
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11 * A <code>XPathUtils</code> ...
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12 *
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13 * @author Matthew J. Duftler (duftler@us.ibm.com)
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14 * @author Sanjiva Weerawarana (sanjiva@watson.ibm.com)
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15 */
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16 public class XPathUtils
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17 {
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18 private static Node getPreviousTypedNode(Node node, short nodeType)
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19 {
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20 node = node.getPreviousSibling();
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21
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22 while (node != null && node.getNodeType() != nodeType)
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23 {
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24 node = node.getPreviousSibling();
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25 }
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26
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27 return node;
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28 }
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29
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30 private static Node getNextTypedNode(Node node, short nodeType)
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31 {
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32 node = node.getNextSibling();
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33
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34 while (node != null && node.getNodeType() != nodeType)
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35 {
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36 node = node.getNextSibling();
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37 }
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38
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39 return node;
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40 }
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41
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42 private static String getValue(Node node, short nodeType)
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43 {
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44 switch (nodeType)
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45 {
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46 case Node.ELEMENT_NODE :
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47 return ((Element)node).getTagName();
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48
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49 case Node.TEXT_NODE :
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50 return ((Text)node).getData();
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51
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52 case Node.PROCESSING_INSTRUCTION_NODE :
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53 return ((ProcessingInstruction)node).getData();
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54
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55 default :
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56 return "";
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57 }
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58 }
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59
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60 private static short getNodeType(Node node)
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61 {
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62 return (node != null ? node.getNodeType() : -1);
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63 }
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64
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65 private static String getXPathFromVector(Vector path)
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66 {
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67 StringBuffer strBuf = new StringBuffer();
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68 int length = path.size();
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69
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70 for (int i = 0; i < length; i++)
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71 {
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72 Node tempNode = (Node)path.elementAt(i);
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73 short nodeType = getNodeType(tempNode);
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74 String targetValue = getValue(tempNode, nodeType);
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75 int position = 1;
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76
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77 tempNode = getPreviousTypedNode(tempNode, nodeType);
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78
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79 while (tempNode != null)
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80 {
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81 if (nodeType == Node.ELEMENT_NODE)
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82 {
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83 if (getValue(tempNode, nodeType).equals(targetValue))
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84 {
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85 position++;
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86 }
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87 }
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88 else
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89 {
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90 position++;
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91 }
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92
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93 tempNode = getPreviousTypedNode(tempNode, nodeType);
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94 }
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95
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96 boolean hasMatchingSiblings = (position > 1);
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97
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98 if (!hasMatchingSiblings)
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99 {
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100 tempNode = (Node)path.elementAt(i);
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101 tempNode = getNextTypedNode(tempNode, nodeType);
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102
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103 while (!hasMatchingSiblings && tempNode != null)
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104 {
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105 if (nodeType == Node.ELEMENT_NODE)
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106 {
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107 if (getValue(tempNode, nodeType).equals(targetValue))
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108 {
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109 hasMatchingSiblings = true;
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110 }
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111 else
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112 {
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113 tempNode = getNextTypedNode(tempNode, nodeType);
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114 }
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115 }
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116 else
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117 {
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118 hasMatchingSiblings = true;
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119 }
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120 }
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121 }
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122
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123 String step;
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124
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125 switch (nodeType)
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126 {
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127 case Node.TEXT_NODE :
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128 step = "text()";
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129 break;
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130 case Node.PROCESSING_INSTRUCTION_NODE :
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131 step = "processing-instruction()";
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132 break;
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133 default :
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134 step = targetValue;
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135 break;
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136 }
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137
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138 if (step != null && step.length() > 0)
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139 {
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140 strBuf.append('/' + step);
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141 }
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142
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143 if (hasMatchingSiblings)
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144 {
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145 strBuf.append("[" + position + "]");
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146 }
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147 }
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148
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149 return strBuf.toString();
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150 }
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151
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152 private static Vector getVectorPathFromNode(Node node)
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153 {
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154 Vector path = new Vector();
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155
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156 while (node != null)
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157 {
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158 path.insertElementAt(node, 0);
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159 node = node.getParentNode();
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160 }
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161
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162 return path;
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163 }
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164
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165 /**
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166 * Generates an XPath expression that will return only the given node as its
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167 * result. This method only works for element, text, document and PI nodes.
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168 *
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169 * @param node the node to generate an XPath expression for. This node must
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170 * be an element node, a text node, a document node, or a processing
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171 * instruction node.
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172 * @return an XPath expression that will return only the given node as its
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173 * result.
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174 * @exception IllegalArgumentException if the given node is not an element,
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175 * text, document or PI node.
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176 */
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177 public static String getXPathExprFromNode(Node node)
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178 throws IllegalArgumentException
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179 {
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180 short nodeType = getNodeType(node);
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181
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182 switch (nodeType)
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183 {
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184 case Node.ELEMENT_NODE :
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185 case Node.TEXT_NODE :
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186 case Node.PROCESSING_INSTRUCTION_NODE :
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187 return getXPathFromVector(getVectorPathFromNode(node));
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188
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189 case Node.DOCUMENT_NODE :
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190 return "/";
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191
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192 default :
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193 throw new IllegalArgumentException("Only works for element, text, " +
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194 "document, and PI nodes.");
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195 }
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196 }
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197 }