Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/Builder.java @ 998:b81626b10cb7
Datacage: Moved templating in a better suited package.
flys-artifacts/trunk@2434 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 01 Aug 2011 08:31:09 +0000 |
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children | aca3b46160cb |
rev | line source |
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Datacage: Moved templating in a better suited package.
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1 package de.intevation.flys.artifacts.datacage.templating; |
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2 |
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3 import java.util.regex.Pattern; |
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4 import java.util.regex.Matcher; |
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5 |
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6 import java.util.ArrayList; |
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7 import java.util.List; |
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8 import java.util.HashMap; |
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9 import java.util.Map; |
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10 |
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11 import org.w3c.dom.Document; |
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12 import org.w3c.dom.NodeList; |
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13 import org.w3c.dom.Node; |
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14 import org.w3c.dom.Element; |
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15 |
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16 import javax.xml.xpath.XPath; |
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17 import javax.xml.xpath.XPathFactory; |
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18 import javax.xml.xpath.XPathExpressionException; |
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19 import javax.xml.xpath.XPathConstants; |
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20 |
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21 import java.sql.SQLException; |
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22 import java.sql.Connection; |
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23 |
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24 import de.intevation.artifacts.common.utils.XMLUtils; |
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25 |
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26 import org.apache.log4j.Logger; |
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27 |
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28 public class Builder |
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29 { |
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30 private static Logger log = Logger.getLogger(Builder.class); |
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31 |
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32 public static final Pattern STRIP_LINE_INDENT = |
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33 Pattern.compile("\\s*\\r?\\n\\s*"); |
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34 |
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35 public static final String DC_NAMESPACE_URI = |
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36 "http://www.intevation.org/2011/Datacage"; |
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37 |
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38 private static final Document EVAL_DOCUMENT = |
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39 XMLUtils.newDocument(); |
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40 |
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41 private static final XPathFactory XPATH_FACTORY = |
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42 XPathFactory.newInstance(); |
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43 |
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44 protected Document template; |
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45 |
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46 protected Map<String, CompiledStatement> compiledStatements; |
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47 |
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48 |
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49 public class BuildHelper |
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50 { |
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51 protected Node output; |
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52 protected Document owner; |
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53 protected StackFrames frames; |
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54 protected Connection connection; |
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55 protected Map<String, CompiledStatement.Instance> statements; |
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56 |
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57 public BuildHelper( |
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58 Node output, |
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59 Connection connection, |
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60 Map<String, Object> parameters |
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61 ) { |
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62 this.output = output; |
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63 this.connection = connection; |
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64 frames = new StackFrames(parameters); |
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65 statements = new HashMap<String, CompiledStatement.Instance>(); |
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66 owner = getOwnerDocument(output); |
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67 } |
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68 |
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69 public void build() throws SQLException { |
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70 try { |
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71 synchronized (template) { |
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72 for (Node current: rootsToList()) { |
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73 build(output, current); |
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74 } |
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75 } |
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76 } |
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77 finally { |
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78 closeStatements(); |
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79 } |
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80 } |
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81 |
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82 protected void closeStatements() { |
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83 for (CompiledStatement.Instance csi: statements.values()) { |
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84 csi.close(); |
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85 } |
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86 statements.clear(); |
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87 } |
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88 |
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89 protected void context(Node parent, Element current) |
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90 throws SQLException |
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91 { |
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92 NodeList elements = current.getElementsByTagNameNS( |
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93 DC_NAMESPACE_URI, "elements"); |
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94 |
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95 if (elements.getLength() < 1) { |
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96 log.warn("no elements found -> ignore"); |
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97 return; |
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98 } |
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99 |
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100 NodeList subs = elements.item(0).getChildNodes(); |
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101 int S = subs.getLength(); |
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102 |
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103 if (S < 1) { |
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104 log.warn("elements is empty -> ignore"); |
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105 return; |
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106 } |
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107 |
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108 NodeList stmntNode = current.getElementsByTagNameNS( |
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109 DC_NAMESPACE_URI, "statement"); |
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110 |
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111 if (stmntNode.getLength() < 1) { |
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112 log.warn("dc:context: too less statements"); |
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113 return; |
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114 } |
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115 |
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116 String stmntText = stmntNode.item(0).getTextContent(); |
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117 |
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118 CompiledStatement.Instance csi = statements.get(stmntText); |
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119 |
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120 if (csi == null) { |
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121 CompiledStatement cs = compiledStatements.get(stmntText); |
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122 csi = cs.new Instance(); |
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123 statements.put(stmntText, csi); |
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124 } |
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125 |
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126 ResultData rd = csi.execute(connection, frames); |
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127 |
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128 String [] columns = rd.getColumnLabels(); |
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129 |
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130 |
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131 for (Object [] row: rd.getRows()) { |
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132 frames.enter(); |
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133 try { |
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134 frames.put(columns, row); |
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135 for (int i = 0; i < S; ++i) { |
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136 build(parent, subs.item(i)); |
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137 } |
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138 } |
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139 finally { |
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140 frames.leave(); |
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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 protected void element(Node parent, Element current) |
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146 throws SQLException |
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147 { |
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148 String attr = expand(current.getAttribute("name")); |
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149 |
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150 if (log.isDebugEnabled()) { |
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151 log.debug("dc:element -> '" + attr + "'"); |
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152 } |
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153 |
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154 if (attr.length() == 0) { |
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155 log.warn("no name attribute found"); |
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156 return; |
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157 } |
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158 |
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159 Element element = owner.createElement(attr); |
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160 |
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161 NodeList children = current.getChildNodes(); |
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162 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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163 build(element, children.item(i)); |
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164 } |
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165 |
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166 parent.appendChild(element); |
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167 } |
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168 |
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169 protected void text(Node parent, Element current) |
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170 throws SQLException |
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171 { |
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172 log.debug("dc:text"); |
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173 String value = expand(current.getTextContent()); |
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174 parent.appendChild(owner.createTextNode(value)); |
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175 } |
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176 |
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177 |
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178 protected void attribute(Node parent, Element current) { |
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179 |
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180 if (parent.getNodeType() != Node.ELEMENT_NODE) { |
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181 log.warn("need element here"); |
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182 return; |
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183 } |
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184 |
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185 String name = expand(current.getAttribute("name")); |
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186 String value = expand(current.getAttribute("value")); |
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187 |
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188 Element element = (Element)parent; |
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189 |
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190 element.setAttribute(name, value); |
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191 } |
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192 |
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193 protected void callMacro(Node parent, Element current) |
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194 throws SQLException |
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195 { |
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196 String name = current.getAttribute("name"); |
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197 |
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198 if (name.length() == 0) { |
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199 log.warn("missing 'name' attribute in 'call-macro'"); |
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200 return; |
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201 } |
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202 |
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203 NodeList macros = template.getElementsByTagNameNS( |
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204 DC_NAMESPACE_URI, "macro"); |
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205 |
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206 for (int i = 0, N = macros.getLength(); i < N; ++i) { |
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207 Element macro = (Element)macros.item(i); |
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208 if (name.equals(macro.getAttribute("name"))) { |
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209 NodeList subs = macro.getChildNodes(); |
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210 for (int j = 0, M = subs.getLength(); j < M; ++j) { |
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211 build(parent, subs.item(j)); |
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212 } |
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213 return; |
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214 } |
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215 } |
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216 |
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217 log.warn("no macro '" + name + "' found."); |
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218 } |
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219 |
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220 protected void ifClause(Node parent, Element current) |
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221 throws SQLException |
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222 { |
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223 String test = current.getAttribute("test"); |
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224 |
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225 if (test.length() == 0) { |
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226 log.warn("missing 'test' attribute in 'if'"); |
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227 return; |
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228 } |
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229 |
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230 Boolean result = evaluateXPath(test); |
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231 |
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232 if (result != null && result.booleanValue()) { |
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233 NodeList subs = current.getChildNodes(); |
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234 for (int i = 0, N = subs.getLength(); i < N; ++i) { |
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235 build(parent, subs.item(i)); |
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236 } |
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237 } |
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238 } |
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239 |
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240 protected void choose(Node parent, Element current) |
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241 throws SQLException |
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242 { |
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243 Node branch = null; |
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244 |
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245 NodeList children = current.getChildNodes(); |
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246 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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247 Node child = children.item(i); |
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248 String ns = child.getNamespaceURI(); |
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249 if (ns == null |
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250 || !ns.equals(DC_NAMESPACE_URI) |
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251 || child.getNodeType() != Node.ELEMENT_NODE |
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252 ) { |
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253 continue; |
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254 } |
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255 String name = child.getLocalName(); |
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256 if ("when".equals(name)) { |
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257 Element when = (Element)child; |
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258 String test = when.getAttribute("test"); |
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259 if (test.length() == 0) { |
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260 log.warn("no 'test' attribute found for when"); |
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261 continue; |
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262 } |
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263 |
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264 Boolean result = evaluateXPath(test); |
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265 if (result != null && result.booleanValue()) { |
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266 branch = child; |
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267 break; |
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268 } |
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269 |
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270 continue; |
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271 } |
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272 else if ("otherwise".equals(name)) { |
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273 branch = child; |
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274 // No break here. |
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275 } |
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276 } |
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277 |
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278 if (branch != null) { |
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279 NodeList subs = branch.getChildNodes(); |
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280 for (int i = 0, N = subs.getLength(); i < N; ++i) { |
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281 build(parent, subs.item(i)); |
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282 } |
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283 } |
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284 } |
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285 |
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286 protected Boolean evaluateXPath(String expr) { |
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287 |
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288 if (log.isDebugEnabled()) { |
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289 log.debug("evaluate: '" + expr + "'"); |
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290 } |
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291 |
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292 try { |
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293 XPath xpath = XPATH_FACTORY.newXPath(); |
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294 xpath.setXPathVariableResolver(frames); |
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295 xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS); |
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296 Object result = xpath.evaluate( |
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297 expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN); |
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298 |
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299 return result instanceof Boolean |
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300 ? (Boolean)result |
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301 : null; |
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302 } |
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303 catch (XPathExpressionException xfce) { |
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304 log.error(xfce); |
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305 } |
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306 return null; |
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307 } |
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308 |
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309 protected void convert(Node parent, Element current) { |
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310 |
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311 String variable = expand(current.getAttribute("var")); |
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312 String type = expand(current.getAttribute("type")); |
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313 |
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314 if (frames.containsKey(variable)) { |
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315 Object object = TypeConverter.convert( |
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316 frames.get(variable), |
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317 type); |
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318 frames.put(variable, object); |
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319 } |
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320 } |
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321 |
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322 protected String expand(String s) { |
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323 Matcher m = CompiledStatement.VAR.matcher(s); |
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324 |
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325 StringBuffer sb = new StringBuffer(); |
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326 while (m.find()) { |
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327 String key = m.group(1); |
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328 Object value = frames.get(key); |
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329 m.appendReplacement(sb, value != null ? value.toString() : ""); |
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330 } |
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331 m.appendTail(sb); |
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332 return sb.toString(); |
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333 } |
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334 |
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335 protected void build(Node parent, Node current) |
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336 throws SQLException |
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337 { |
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338 String ns = current.getNamespaceURI(); |
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339 if (ns != null && ns.equals(DC_NAMESPACE_URI)) { |
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340 if (current.getNodeType() != Node.ELEMENT_NODE) { |
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341 log.warn("need elements here"); |
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342 } |
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343 else { |
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344 String localName = current.getLocalName(); |
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345 if ("attribute".equals(localName)) { |
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346 attribute(parent, (Element)current); |
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347 } |
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348 else if ("context".equals(localName)) { |
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349 context(parent, (Element)current); |
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350 } |
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351 else if ("if".equals(localName)) { |
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352 ifClause(parent, (Element)current); |
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353 } |
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354 else if ("choose".equals(localName)) { |
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355 choose(parent, (Element)current); |
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356 } |
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357 else if ("call-macro".equals(localName)) { |
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358 callMacro(parent, (Element)current); |
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359 } |
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360 else if ("macro".equals(localName)) { |
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361 // simply ignore the definition. |
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362 } |
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363 else if ("element".equals(localName)) { |
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364 element(parent, (Element)current); |
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365 } |
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366 else if ("text".equals(localName)) { |
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367 text(parent, (Element)current); |
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368 } |
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369 else if ("convert".equals(localName)) { |
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370 convert(parent, (Element)current); |
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371 } |
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372 else { |
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373 log.warn("unknown '" + localName + "' -> ignore"); |
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374 } |
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375 } |
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376 return; |
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377 } |
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378 |
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379 if (current.getNodeType() == Node.TEXT_NODE) { |
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380 String txt = current.getNodeValue(); |
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381 if (txt != null && txt.trim().length() == 0) { |
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382 return; |
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383 } |
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384 } |
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385 |
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386 Node copy = owner.importNode(current, false); |
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387 |
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388 NodeList children = current.getChildNodes(); |
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389 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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390 build(copy, children.item(i)); |
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391 } |
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392 parent.appendChild(copy); |
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393 } |
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394 } // class BuildHelper |
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395 |
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396 |
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397 public Builder() { |
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398 compiledStatements = new HashMap<String, CompiledStatement>(); |
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399 } |
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400 |
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401 public Builder(Document template) { |
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402 this(); |
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403 this.template = template; |
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404 compileStatements(); |
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405 } |
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406 |
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407 protected void compileStatements() { |
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408 |
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409 NodeList nodes = template.getElementsByTagNameNS( |
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410 DC_NAMESPACE_URI, "statement"); |
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411 |
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412 for (int i = 0, N = nodes.getLength(); i < N; ++i) { |
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413 Element stmntElement = (Element)nodes.item(i); |
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414 String stmnt = trimStatement(stmntElement.getTextContent()); |
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415 if (stmnt == null || stmnt.length() == 0) { |
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416 throw new IllegalArgumentException("found empty statement"); |
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417 } |
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418 CompiledStatement cs = new CompiledStatement(stmnt); |
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419 // for faster lookup store a shortend string into the template |
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420 stmnt = "s" + i; |
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421 stmntElement.setTextContent(stmnt); |
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422 compiledStatements.put(stmnt, cs); |
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423 } |
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424 } |
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425 |
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426 protected List<Node> rootsToList() { |
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427 |
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428 NodeList roots = template.getElementsByTagNameNS( |
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429 DC_NAMESPACE_URI, "template"); |
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430 |
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431 List<Node> elements = new ArrayList<Node>(); |
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432 |
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433 for (int i = 0, N = roots.getLength(); i < N; ++i) { |
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434 NodeList rootChildren = roots.item(i).getChildNodes(); |
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435 for (int j = 0, M = rootChildren.getLength(); j < M; ++j) { |
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436 Node child = rootChildren.item(j); |
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437 if (child.getNodeType() == Node.ELEMENT_NODE) { |
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438 elements.add(child); |
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439 } |
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440 } |
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441 } |
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442 |
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443 return elements; |
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444 } |
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445 |
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446 protected static final String trimStatement(String stmnt) { |
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447 if (stmnt == null) return null; |
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448 //XXX: Maybe a bit to radical for multiline strings? |
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449 return STRIP_LINE_INDENT.matcher(stmnt.trim()).replaceAll(" "); |
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450 } |
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451 |
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452 protected static Document getOwnerDocument(Node node) { |
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453 Document document = node.getOwnerDocument(); |
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454 return document != null ? document : (Document)node; |
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455 } |
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456 |
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457 public void build( |
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458 Connection connection, |
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459 Node output, |
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460 Map<String, Object> parameters |
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461 ) |
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462 throws SQLException |
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463 { |
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464 BuildHelper helper = new BuildHelper(output, connection, parameters); |
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465 |
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466 helper.build(); |
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467 } |
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468 } |
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469 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |