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annotate software/mpdl-services/mpiwg-mpdl-cms/src/de/mpg/mpiwg/berlin/mpdl/cms/transform/GetFragmentsContentHandler.java @ 23:e845310098ba
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author | Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de> |
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date | Tue, 27 Nov 2012 12:35:19 +0100 |
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23
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1 package de.mpg.mpiwg.berlin.mpdl.cms.transform; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.Hashtable; |
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5 |
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6 import org.xml.sax.*; |
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7 |
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8 import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException; |
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9 import de.mpg.mpiwg.berlin.mpdl.util.StringUtils; |
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10 |
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11 public class GetFragmentsContentHandler implements ContentHandler { |
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12 private String xmlnsString = ""; |
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13 private int currentMilestonePosition = 0; |
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14 private Element currentElement; |
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15 private Element currentMilestoneElement; |
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16 private ArrayList<Element> elementQueue; // queue of opened elements (before they were closed): to connect them to a parent hierarchy |
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17 private Hashtable<Integer, StringBuilder> resultFragments = new Hashtable<Integer, StringBuilder>(); |
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18 private String milestoneElemenName = "pb"; // default is pb |
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19 |
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20 public GetFragmentsContentHandler() throws ApplicationException { |
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21 } |
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22 |
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23 public GetFragmentsContentHandler(String milestoneElemenName) throws ApplicationException { |
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24 this.milestoneElemenName = milestoneElemenName; |
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25 } |
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26 |
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27 public Hashtable<Integer, StringBuilder> getResultPages() { |
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28 return resultFragments; |
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29 } |
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30 |
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31 public int getMilestoneCount() { |
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32 return currentMilestonePosition; |
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33 } |
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34 |
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35 public void startDocument() throws SAXException { |
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36 } |
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37 |
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38 public void endDocument() throws SAXException { |
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39 // write the closePath after the last minus 1 milestone element (the closing path after the last milestone element is automatically written by the normal closing tags) |
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40 if (currentMilestoneElement != null) { |
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41 String msClosePath = currentMilestoneElement.getClosePath(); |
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42 write(msClosePath, currentMilestoneElement.milestonePosition - 1); |
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43 } |
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44 resultFragments.remove(new Integer(0)); // this fragment is filled but should not |
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45 } |
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46 |
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47 public void characters(char[] c, int start, int length) throws SAXException { |
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48 char[] cCopy = new char[length]; |
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49 System.arraycopy(c, start, cCopy, 0, length); |
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50 String charactersStr = String.valueOf(cCopy); |
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51 if (charactersStr != null && ! charactersStr.equals("")) { |
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52 if (currentMilestonePosition > 0) { |
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53 charactersStr = StringUtils.deresolveXmlEntities(charactersStr); |
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54 write(charactersStr); |
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55 } |
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56 } |
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57 } |
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58 |
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59 public void ignorableWhitespace(char[] c, int start, int length) throws SAXException { |
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60 } |
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61 |
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62 public void processingInstruction(String target, String data) throws SAXException { |
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63 } |
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64 |
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65 public void setDocumentLocator(Locator locator) { |
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66 } |
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67 |
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68 public void startPrefixMapping(String prefix, String uri) throws SAXException { |
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69 if (prefix != null && prefix.equals("")) |
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70 xmlnsString += "xmlns" + "=\"" + uri + "\" "; |
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71 else |
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72 xmlnsString += "xmlns:" + prefix + "=\"" + uri + "\" "; |
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73 } |
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74 |
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75 public void endPrefixMapping(String prefix) throws SAXException { |
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76 } |
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77 |
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78 public void skippedEntity(String name) throws SAXException { |
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79 } |
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80 |
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81 public void startElement(String uri, String localName, String name, Attributes attrs) throws SAXException { |
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82 if (elementQueue == null) |
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83 elementQueue = new ArrayList<Element>(); |
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84 Element newElement = new Element(name); |
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85 if (currentElement != null) { |
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86 newElement.parent = currentElement; |
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87 } |
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88 currentElement = newElement; |
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89 if (localName != null && localName.equals(milestoneElemenName)) { |
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90 currentMilestonePosition++; |
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91 if (currentMilestoneElement != null) { |
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92 String msClosePath = currentMilestoneElement.getClosePath(); |
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93 write(msClosePath, currentMilestoneElement.milestonePosition - 1); |
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94 } |
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95 currentMilestoneElement = currentElement; |
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96 currentMilestoneElement.milestonePosition = currentMilestonePosition; |
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97 String msOpenPath = currentMilestoneElement.getOpenPath(); |
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98 write(msOpenPath); |
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99 } |
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100 int attrSize = attrs.getLength(); |
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101 String attrString = ""; |
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102 for (int i=0; i<attrSize; i++) { |
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103 String attrQName = attrs.getQName(i); |
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104 String attrValue = attrs.getValue(i); |
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105 attrValue = StringUtils.forXML(attrValue); |
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106 attrString = attrString + " " + attrQName + "=\"" + attrValue + "\""; |
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107 } |
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108 if (attrString != null && ! attrString.isEmpty()) { |
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109 attrString = attrString.trim(); |
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110 currentElement.attrString = attrString; |
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111 } |
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112 if (xmlnsString != null && ! xmlnsString.isEmpty()) { |
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113 xmlnsString = xmlnsString.trim(); |
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114 currentElement.xmlnsString = xmlnsString; |
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115 } |
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116 if (currentMilestonePosition > 0) { |
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117 write("<" + name); |
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118 if (xmlnsString != null && ! xmlnsString.isEmpty()) |
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119 write(" " + xmlnsString); |
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120 if (attrString != null && ! attrString.isEmpty()) |
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121 write(" " + attrString); |
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122 write(">"); |
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123 } |
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124 xmlnsString = ""; |
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125 elementQueue.add(currentElement); |
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126 } |
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127 |
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128 public void endElement(String uri, String localName, String name) throws SAXException { |
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129 if (currentMilestonePosition > 0) { |
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130 write("</" + name + ">"); |
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131 } |
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132 if (elementQueue != null && elementQueue.size() > 0) { |
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133 int lastIndex = elementQueue.size() - 1; |
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134 elementQueue.remove(lastIndex); |
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135 } |
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136 if (elementQueue != null && elementQueue.size() > 0) { |
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137 int lastIndex = elementQueue.size() - 1; |
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138 currentElement = elementQueue.get(lastIndex); |
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139 } else { |
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140 currentElement = null; |
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141 } |
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142 } |
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143 |
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144 private void write(String outStr) throws SAXException { |
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145 StringBuilder resultFragment = resultFragments.get(new Integer(currentMilestonePosition)); |
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146 if (resultFragment == null) { |
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147 resultFragment = new StringBuilder(); |
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148 resultFragments.put(new Integer(currentMilestonePosition), resultFragment); |
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149 } |
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150 resultFragment.append(outStr); |
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151 } |
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152 |
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153 private void write(String outStr, int milestoneNumber) throws SAXException { |
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154 StringBuilder resultFragment = resultFragments.get(new Integer(milestoneNumber)); |
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155 if (resultFragment == null) { |
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156 resultFragment = new StringBuilder(); |
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157 resultFragments.put(new Integer(milestoneNumber), resultFragment); |
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158 } |
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159 resultFragment.append(outStr); |
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160 } |
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161 |
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162 public class Element { |
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163 public String name; |
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164 private String xmlnsString; |
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165 private String attrString; |
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166 private int milestonePosition; |
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167 private Element parent; |
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168 |
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169 private Element(String name) { |
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170 this.name = name; |
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171 } |
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172 |
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173 private String getOpenPath() { |
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174 StringBuilder ancestorsStrBuilder = new StringBuilder(); |
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175 if (parent != null) { |
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176 ancestorsStrBuilder.append(parent.getOpenPath()); |
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177 ancestorsStrBuilder.append("<"); |
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178 ancestorsStrBuilder.append(parent.name); |
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179 if (parent.xmlnsString != null && ! parent.xmlnsString.isEmpty()) { |
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180 ancestorsStrBuilder.append(" "); |
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181 ancestorsStrBuilder.append(parent.xmlnsString); |
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182 } |
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183 if (parent.attrString != null && ! parent.attrString.isEmpty()) { |
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184 ancestorsStrBuilder.append(" " + parent.attrString); |
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185 } |
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186 ancestorsStrBuilder.append(">"); |
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187 } |
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188 return ancestorsStrBuilder.toString(); |
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189 } |
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190 |
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191 private String getClosePath() { |
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192 StringBuilder ancestorsStrBuilder = new StringBuilder(); |
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193 if (parent != null) { |
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194 ancestorsStrBuilder.append("</"); |
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195 ancestorsStrBuilder.append(parent.name); |
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196 ancestorsStrBuilder.append(">"); |
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197 ancestorsStrBuilder.append(parent.getClosePath()); |
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198 } |
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199 return ancestorsStrBuilder.toString(); |
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200 } |
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201 |
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202 } |
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203 } |