Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/Builder.java @ 959:a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
flys-artifacts/trunk@2378 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 20 Jul 2011 16:28:49 +0000 |
parents | e91996b46e3c |
children | 3ba4f5a88c20 |
rev | line source |
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1 package de.intevation.flys.artifacts.services.meta; |
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2 |
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3 import java.util.regex.Matcher; |
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4 |
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5 import java.util.ArrayList; |
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6 import java.util.List; |
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7 import java.util.HashMap; |
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8 import java.util.Map; |
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9 |
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10 import org.w3c.dom.Document; |
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11 import org.w3c.dom.NodeList; |
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12 import org.w3c.dom.Node; |
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13 import org.w3c.dom.Element; |
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14 |
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15 import javax.xml.xpath.XPath; |
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16 import javax.xml.xpath.XPathFactory; |
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17 import javax.xml.xpath.XPathExpressionException; |
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18 import javax.xml.xpath.XPathConstants; |
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19 |
372
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20 import java.sql.SQLException; |
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21 import java.sql.Connection; |
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22 |
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23 import de.intevation.artifacts.common.utils.XMLUtils; |
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24 |
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25 import org.apache.log4j.Logger; |
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26 |
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27 public class Builder |
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28 { |
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29 private static Logger log = Logger.getLogger(Builder.class); |
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30 |
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31 public static final String DC_NAMESPACE_URI = |
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32 "http://www.intevation.org/2011/Datacage"; |
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33 |
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34 private static final Document EVAL_DOCUMENT = |
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35 XMLUtils.newDocument(); |
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36 |
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37 private static final XPathFactory XPATH_FACTORY = |
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38 XPathFactory.newInstance(); |
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39 |
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40 |
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41 |
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42 protected Document template; |
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43 |
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44 public class BuildHelper |
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45 { |
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46 protected Document output; |
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47 protected StackFrames frames; |
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48 protected Connection connection; |
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49 protected Map<String, CompiledStatement> statements; |
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50 |
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51 public BuildHelper( |
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52 Document output, |
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53 Connection connection, |
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54 Map<String, Object> parameters |
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55 ) { |
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56 this.output = output; |
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57 this.connection = connection; |
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58 frames = new StackFrames(parameters); |
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59 statements = new HashMap<String, CompiledStatement>(); |
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60 } |
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61 |
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62 public void build(List<Node> elements) throws SQLException { |
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63 try { |
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64 for (Node current: elements) { |
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65 build(output, current); |
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66 } |
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67 } |
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68 finally { |
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69 for (CompiledStatement cs: statements.values()) { |
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70 cs.close(); |
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71 } |
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72 statements.clear(); |
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73 } |
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74 } |
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75 |
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76 protected void context(Node parent, Element current) |
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77 throws SQLException |
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78 { |
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79 NodeList elements = current.getElementsByTagNameNS( |
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80 DC_NAMESPACE_URI, "elements"); |
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81 |
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82 if (elements.getLength() < 1) { |
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83 log.warn("no elements found -> ignore"); |
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84 return; |
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85 } |
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86 |
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87 NodeList subs = elements.item(0).getChildNodes(); |
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88 int S = subs.getLength(); |
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89 |
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90 if (S < 1) { |
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91 log.warn("elements is empty -> ignore"); |
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92 return; |
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93 } |
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94 |
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95 NodeList stmntNode = current.getElementsByTagNameNS( |
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96 DC_NAMESPACE_URI, "statement"); |
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97 |
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98 if (stmntNode.getLength() < 1) { |
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99 log.warn("dc:context: too less statements"); |
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100 return; |
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101 } |
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102 |
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103 String stmntText = stmntNode.item(0).getTextContent(); |
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104 |
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105 if (stmntText == null |
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106 || (stmntText = stmntText.trim()).length() == 0) { |
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107 log.warn("dc:context: no sql statement found -> ignored"); |
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108 return; |
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109 } |
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110 |
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111 CompiledStatement cs = statements.get(stmntText); |
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112 |
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113 if (cs == null) { |
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114 cs = new CompiledStatement(stmntText); |
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115 statements.put(stmntText, cs); |
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116 } |
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117 |
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118 ResultData rd = cs.execute(connection, frames); |
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119 |
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120 String [] columns = rd.getColumnLabels(); |
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121 |
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122 |
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123 for (Object [] row: rd.getRows()) { |
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124 frames.enter(); |
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125 try { |
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126 frames.put(columns, row); |
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127 for (int i = 0; i < S; ++i) { |
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128 build(parent, subs.item(i)); |
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129 } |
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130 } |
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131 finally { |
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132 frames.leave(); |
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133 } |
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134 } |
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135 } |
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136 |
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137 protected void element(Node parent, Element current) |
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138 throws SQLException |
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139 { |
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140 String attr = expand(current.getAttribute("name")); |
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141 |
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142 if (log.isDebugEnabled()) { |
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143 log.debug("dc:element -> '" + attr + "'"); |
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144 } |
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145 |
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146 if (attr.length() == 0) { |
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147 log.warn("no name attribute found"); |
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148 return; |
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149 } |
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150 |
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151 Element element = output.createElement(attr); |
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152 |
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153 NodeList children = current.getChildNodes(); |
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154 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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155 build(element, children.item(i)); |
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156 } |
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157 |
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158 parent.appendChild(element); |
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|
159 } |
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160 |
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161 protected void text(Node parent, Element current) |
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|
162 throws SQLException |
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|
163 { |
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|
164 log.debug("dc:text"); |
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165 String value = expand(current.getTextContent()); |
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|
166 parent.appendChild(output.createTextNode(value)); |
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|
167 } |
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|
168 |
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|
169 |
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|
170 protected void attribute(Node parent, Element current) { |
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Added meta data service.
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|
171 |
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Added meta data service.
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|
172 if (parent.getNodeType() != Node.ELEMENT_NODE) { |
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Added meta data service.
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|
173 log.warn("need element here"); |
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Added meta data service.
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|
174 return; |
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Added meta data service.
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parents:
diff
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|
175 } |
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Added meta data service.
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|
176 |
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Added meta data service.
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changeset
|
177 String name = expand(current.getAttribute("name")); |
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Added meta data service.
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|
178 String value = expand(current.getAttribute("value")); |
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Added meta data service.
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|
179 |
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Added meta data service.
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|
180 Element element = (Element)parent; |
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Added meta data service.
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|
181 |
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Added meta data service.
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|
182 element.setAttribute(name, value); |
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Added meta data service.
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|
183 } |
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Added meta data service.
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|
184 |
957
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
185 protected void choose(Node parent, Element current) |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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186 throws SQLException |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
187 { |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
188 Node branch = null; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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189 |
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|
190 NodeList children = current.getChildNodes(); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
191 for (int i = 0, N = children.getLength(); i < N; ++i) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
192 Node child = children.item(i); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
193 String ns = child.getNamespaceURI(); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
194 if (ns == null |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
195 || !ns.equals(DC_NAMESPACE_URI) |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
196 || child.getNodeType() != Node.ELEMENT_NODE |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
197 ) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
198 continue; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
199 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
200 String name = child.getLocalName(); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
201 if ("when".equals(name)) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
202 Element when = (Element)child; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
203 String test = when.getAttribute("test"); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
changeset
|
204 if (test.length() == 0) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
205 log.warn("no 'test' attribute found for when"); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
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|
206 continue; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
207 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
208 |
959
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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parents:
957
diff
changeset
|
209 Boolean result = evaluateXPath(test); |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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diff
changeset
|
210 if (result != null && result.booleanValue()) { |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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957
diff
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|
211 branch = child; |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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diff
changeset
|
212 break; |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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parents:
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diff
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|
213 } |
957
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
changeset
|
214 |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
changeset
|
215 continue; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
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|
216 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
changeset
|
217 else if ("otherwise".equals(name)) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
218 branch = child; |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
219 // No break here. |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
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|
220 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
changeset
|
221 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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parents:
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diff
changeset
|
222 |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
223 if (branch != null) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
224 NodeList subs = branch.getChildNodes(); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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|
225 for (int i = 0, N = subs.getLength(); i < N; ++i) { |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
changeset
|
226 build(parent, subs.item(i)); |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
227 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
228 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
229 } |
e91996b46e3c
Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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diff
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|
230 |
959
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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957
diff
changeset
|
231 protected Boolean evaluateXPath(String expr) { |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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diff
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|
232 try { |
a2b20ed3d3b4
Datacage: Added custom provider for XPath functions.
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diff
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|
233 XPath xpath = XPATH_FACTORY.newXPath(); |
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234 xpath.setXPathVariableResolver(frames); |
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235 xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS); |
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236 Object result = xpath.evaluate( |
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237 expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN); |
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238 |
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239 return result instanceof Boolean |
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240 ? (Boolean)result |
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241 : null; |
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242 } |
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243 catch (XPathExpressionException xfce) { |
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244 log.error(xfce); |
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245 } |
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246 return null; |
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247 } |
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248 |
415
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249 protected void convert(Node parent, Element current) { |
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250 |
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251 String variable = expand(current.getAttribute("var")); |
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252 String type = expand(current.getAttribute("type")); |
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253 |
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254 if (frames.containsKey(variable)) { |
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255 Object object = TypeConverter.convert( |
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256 frames.get(variable), |
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257 type); |
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258 frames.put(variable, object); |
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259 } |
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260 } |
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261 |
372
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262 protected String expand(String s) { |
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263 Matcher m = CompiledStatement.VAR.matcher(s); |
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264 |
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265 StringBuffer sb = new StringBuffer(); |
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266 while (m.find()) { |
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267 String key = m.group(1); |
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268 Object value = frames.get(key); |
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269 m.appendReplacement(sb, value != null ? value.toString() : ""); |
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270 } |
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271 m.appendTail(sb); |
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272 return sb.toString(); |
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273 } |
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274 |
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275 protected void build(Node parent, Node current) |
372
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276 throws SQLException |
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277 { |
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278 String ns = current.getNamespaceURI(); |
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279 if (ns != null && ns.equals(DC_NAMESPACE_URI)) { |
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280 if (current.getNodeType() != Node.ELEMENT_NODE) { |
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281 log.warn("need elements here"); |
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282 } |
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283 else { |
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284 String localName = current.getLocalName(); |
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285 if ("context".equals(localName)) { |
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286 context(parent, (Element)current); |
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287 } |
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Meta data template: Added new choose/when/otherwise construct similiar to XSLT
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288 else if ("choose".equals(localName)) { |
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289 choose(parent, (Element)current); |
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290 } |
372
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291 else if ("attribute".equals(localName)) { |
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292 attribute(parent, (Element)current); |
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293 } |
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294 else if ("element".equals(localName)) { |
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295 element(parent, (Element)current); |
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296 } |
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297 else if ("text".equals(localName)) { |
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298 text(parent, (Element)current); |
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299 } |
415
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300 else if ("convert".equals(localName)) { |
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301 convert(parent, (Element)current); |
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302 } |
372
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|
303 else { |
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|
304 log.warn("unknown '" + localName + "' -> ignore"); |
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|
305 } |
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|
306 } |
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|
307 return; |
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|
308 } |
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|
309 |
410
df02137b3b28
Datacage service: Cleanup served XML document.
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310 if (current.getNodeType() == Node.TEXT_NODE) { |
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311 String txt = current.getNodeValue(); |
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312 if (txt != null && txt.trim().length() == 0) { |
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313 return; |
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314 } |
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|
315 } |
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diff
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|
316 |
372
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|
317 Node copy = output.importNode(current, false); |
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|
318 |
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319 NodeList children = current.getChildNodes(); |
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320 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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321 build(copy, children.item(i)); |
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322 } |
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323 parent.appendChild(copy); |
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|
324 } |
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|
325 } // class BuildHelper |
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326 |
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|
327 |
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|
328 public Builder() { |
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|
329 } |
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|
330 |
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|
331 public Builder(Document template) { |
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|
332 this.template = template; |
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|
333 } |
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|
334 |
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|
335 public Document build(Connection connection) |
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|
336 throws SQLException |
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|
337 { |
415
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338 return build(connection, XMLUtils.newDocument(), null); |
372
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|
339 } |
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|
340 |
415
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341 public Document build( |
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342 Connection connection, |
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343 Document output, |
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|
344 Map<String, Object> parameters |
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|
345 ) |
372
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|
346 throws SQLException |
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|
347 { |
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|
348 NodeList roots = template.getElementsByTagNameNS( |
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|
349 DC_NAMESPACE_URI, "template"); |
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|
350 |
415
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|
351 BuildHelper helper = new BuildHelper(output, connection, parameters); |
372
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352 |
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353 List<Node> elements = new ArrayList<Node>(); |
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354 |
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355 for (int i = 0, N = roots.getLength(); i < N; ++i) { |
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356 NodeList rootChildren = roots.item(i).getChildNodes(); |
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357 for (int j = 0, M = rootChildren.getLength(); j < M; ++j) { |
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358 Node child = rootChildren.item(j); |
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359 if (child.getNodeType() == Node.ELEMENT_NODE) { |
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360 elements.add(child); |
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361 } |
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362 } |
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363 } |
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364 helper.build(elements); |
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365 |
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366 return output; |
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367 } |
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368 } |
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369 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |