Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/Builder.java @ 1011:aca3b46160cb
Added support for more than one db connection in datacage templating.
flys-artifacts/trunk@2457 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 02 Aug 2011 22:16:16 +0000 |
parents | b81626b10cb7 |
children | 9a1a3080ad98 |
rev | line source |
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998
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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 import java.util.Deque; |
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11 import java.util.ArrayDeque; |
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12 |
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13 import org.w3c.dom.Document; |
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14 import org.w3c.dom.NodeList; |
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15 import org.w3c.dom.Node; |
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16 import org.w3c.dom.Element; |
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17 |
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18 import javax.xml.xpath.XPath; |
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19 import javax.xml.xpath.XPathFactory; |
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20 import javax.xml.xpath.XPathExpressionException; |
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21 import javax.xml.xpath.XPathConstants; |
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22 |
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23 import java.sql.SQLException; |
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24 import java.sql.Connection; |
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25 |
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26 import de.intevation.artifacts.common.utils.XMLUtils; |
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27 |
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28 import org.apache.log4j.Logger; |
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29 |
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30 public class Builder |
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31 { |
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32 private static Logger log = Logger.getLogger(Builder.class); |
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33 |
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34 public static final Pattern STRIP_LINE_INDENT = |
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35 Pattern.compile("\\s*\\r?\\n\\s*"); |
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36 |
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37 public static final String DC_NAMESPACE_URI = |
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38 "http://www.intevation.org/2011/Datacage"; |
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39 |
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40 private static final Document EVAL_DOCUMENT = |
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41 XMLUtils.newDocument(); |
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42 |
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43 private static final XPathFactory XPATH_FACTORY = |
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44 XPathFactory.newInstance(); |
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45 |
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46 protected Document template; |
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47 |
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48 protected Map<String, CompiledStatement> compiledStatements; |
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49 |
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50 public static class NamedConnection { |
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51 |
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52 protected String name; |
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53 protected Connection connection; |
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54 protected boolean cached; |
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55 |
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56 public NamedConnection() { |
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57 } |
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58 |
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59 public NamedConnection( |
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60 String name, |
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61 Connection connection |
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62 ) { |
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63 this(name, connection, true); |
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64 } |
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65 |
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66 public NamedConnection( |
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67 String name, |
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68 Connection connection, |
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69 boolean cached |
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70 ) { |
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71 this.name = name; |
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72 this.connection = connection; |
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73 this.cached = cached; |
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74 } |
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75 } // class NamedConnection |
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76 |
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77 |
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78 public class BuildHelper |
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79 { |
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80 protected Node output; |
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81 protected Document owner; |
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82 protected StackFrames frames; |
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83 protected List<NamedConnection> connections; |
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84 protected Map<String, CompiledStatement.Instance> statements; |
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85 protected Deque<NamedConnection> connectionsStack; |
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86 |
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87 public BuildHelper( |
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88 Node output, |
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89 List<NamedConnection> connections, |
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90 Map<String, Object> parameters |
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91 ) { |
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92 if (connections.isEmpty()) { |
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93 throw new IllegalArgumentException("no connections given."); |
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94 } |
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95 |
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96 this.connections = connections; |
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97 connectionsStack = new ArrayDeque<NamedConnection>(); |
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98 this.output = output; |
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99 frames = new StackFrames(parameters); |
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100 owner = getOwnerDocument(output); |
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101 statements = |
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102 new HashMap<String, CompiledStatement.Instance>(); |
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103 } |
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104 |
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105 public void build() throws SQLException { |
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106 try { |
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107 synchronized (template) { |
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108 for (Node current: rootsToList()) { |
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109 build(output, current); |
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110 } |
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111 } |
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112 } |
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113 finally { |
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114 closeStatements(); |
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115 } |
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116 } |
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117 |
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118 protected void closeStatements() { |
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119 for (CompiledStatement.Instance csi: statements.values()) { |
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120 csi.close(); |
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121 } |
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122 statements.clear(); |
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123 } |
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124 |
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125 protected void context(Node parent, Element current) |
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126 throws SQLException |
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127 { |
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128 NodeList elements = current.getElementsByTagNameNS( |
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129 DC_NAMESPACE_URI, "elements"); |
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130 |
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131 if (elements.getLength() < 1) { |
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132 log.warn("no elements found -> ignore"); |
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133 return; |
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134 } |
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135 |
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136 NodeList subs = elements.item(0).getChildNodes(); |
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137 int S = subs.getLength(); |
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138 |
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139 if (S < 1) { |
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140 log.warn("elements is empty -> ignore"); |
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141 return; |
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142 } |
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143 |
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144 NodeList stmntNode = current.getElementsByTagNameNS( |
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145 DC_NAMESPACE_URI, "statement"); |
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146 |
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147 if (stmntNode.getLength() < 1) { |
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148 log.warn("dc:context: too less statements"); |
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149 return; |
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150 } |
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151 |
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152 String con = current.getAttribute("connection"); |
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153 |
998
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154 String stmntText = stmntNode.item(0).getTextContent(); |
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155 |
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156 String key = con + "-" + stmntText; |
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157 |
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158 CompiledStatement.Instance csi = statements.get(key); |
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159 |
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160 if (csi == null) { |
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161 CompiledStatement cs = compiledStatements.get(stmntText); |
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162 csi = cs.new Instance(); |
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163 statements.put(key, csi); |
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164 } |
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165 |
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166 NamedConnection connection = connectionsStack.isEmpty() |
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167 ? connections.get(0) |
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168 : connectionsStack.peek(); |
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169 |
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170 if (con.length() > 0) { |
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171 for (NamedConnection nc: connections) { |
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172 if (con.equals(nc.name)) { |
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173 connection = nc; |
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174 break; |
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175 } |
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176 } |
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177 } |
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178 |
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179 connectionsStack.push(connection); |
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180 try { |
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181 ResultData rd = csi.execute( |
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182 connection.connection, |
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183 frames, |
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184 connection.cached); |
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185 |
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186 String [] columns = rd.getColumnLabels(); |
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187 |
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188 for (Object [] row: rd.getRows()) { |
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189 frames.enter(); |
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190 try { |
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191 frames.put(columns, row); |
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192 for (int i = 0; i < S; ++i) { |
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193 build(parent, subs.item(i)); |
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194 } |
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195 } |
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196 finally { |
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197 frames.leave(); |
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198 } |
998
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199 } |
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200 } |
1011
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201 finally { |
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202 connectionsStack.pop(); |
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203 } |
998
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204 } |
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205 |
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206 protected void element(Node parent, Element current) |
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207 throws SQLException |
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208 { |
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209 String attr = expand(current.getAttribute("name")); |
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210 |
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211 if (log.isDebugEnabled()) { |
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212 log.debug("dc:element -> '" + attr + "'"); |
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213 } |
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214 |
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215 if (attr.length() == 0) { |
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216 log.warn("no name attribute found"); |
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217 return; |
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218 } |
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219 |
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220 Element element = owner.createElement(attr); |
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221 |
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222 NodeList children = current.getChildNodes(); |
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223 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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224 build(element, children.item(i)); |
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225 } |
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226 |
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227 parent.appendChild(element); |
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228 } |
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229 |
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230 protected void text(Node parent, Element current) |
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231 throws SQLException |
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232 { |
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233 log.debug("dc:text"); |
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234 String value = expand(current.getTextContent()); |
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235 parent.appendChild(owner.createTextNode(value)); |
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236 } |
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237 |
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238 |
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239 protected void attribute(Node parent, Element current) { |
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240 |
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241 if (parent.getNodeType() != Node.ELEMENT_NODE) { |
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242 log.warn("need element here"); |
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243 return; |
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244 } |
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245 |
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246 String name = expand(current.getAttribute("name")); |
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247 String value = expand(current.getAttribute("value")); |
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248 |
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249 Element element = (Element)parent; |
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250 |
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251 element.setAttribute(name, value); |
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252 } |
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253 |
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254 protected void callMacro(Node parent, Element current) |
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255 throws SQLException |
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256 { |
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257 String name = current.getAttribute("name"); |
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258 |
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259 if (name.length() == 0) { |
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260 log.warn("missing 'name' attribute in 'call-macro'"); |
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261 return; |
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262 } |
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263 |
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264 NodeList macros = template.getElementsByTagNameNS( |
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265 DC_NAMESPACE_URI, "macro"); |
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266 |
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267 for (int i = 0, N = macros.getLength(); i < N; ++i) { |
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268 Element macro = (Element)macros.item(i); |
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269 if (name.equals(macro.getAttribute("name"))) { |
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270 NodeList subs = macro.getChildNodes(); |
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271 for (int j = 0, M = subs.getLength(); j < M; ++j) { |
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272 build(parent, subs.item(j)); |
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273 } |
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274 return; |
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275 } |
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276 } |
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277 |
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278 log.warn("no macro '" + name + "' found."); |
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279 } |
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280 |
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281 protected void ifClause(Node parent, Element current) |
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282 throws SQLException |
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283 { |
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284 String test = current.getAttribute("test"); |
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285 |
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286 if (test.length() == 0) { |
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287 log.warn("missing 'test' attribute in 'if'"); |
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288 return; |
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289 } |
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290 |
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291 Boolean result = evaluateXPath(test); |
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292 |
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293 if (result != null && result.booleanValue()) { |
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294 NodeList subs = current.getChildNodes(); |
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295 for (int i = 0, N = subs.getLength(); i < N; ++i) { |
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296 build(parent, subs.item(i)); |
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297 } |
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298 } |
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299 } |
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300 |
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301 protected void choose(Node parent, Element current) |
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302 throws SQLException |
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303 { |
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304 Node branch = null; |
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305 |
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306 NodeList children = current.getChildNodes(); |
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307 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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308 Node child = children.item(i); |
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309 String ns = child.getNamespaceURI(); |
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310 if (ns == null |
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311 || !ns.equals(DC_NAMESPACE_URI) |
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312 || child.getNodeType() != Node.ELEMENT_NODE |
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313 ) { |
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314 continue; |
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315 } |
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316 String name = child.getLocalName(); |
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317 if ("when".equals(name)) { |
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318 Element when = (Element)child; |
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319 String test = when.getAttribute("test"); |
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320 if (test.length() == 0) { |
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321 log.warn("no 'test' attribute found for when"); |
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322 continue; |
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323 } |
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324 |
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325 Boolean result = evaluateXPath(test); |
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326 if (result != null && result.booleanValue()) { |
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327 branch = child; |
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328 break; |
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329 } |
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330 |
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331 continue; |
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332 } |
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333 else if ("otherwise".equals(name)) { |
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334 branch = child; |
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335 // No break here. |
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336 } |
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337 } |
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338 |
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339 if (branch != null) { |
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340 NodeList subs = branch.getChildNodes(); |
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341 for (int i = 0, N = subs.getLength(); i < N; ++i) { |
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342 build(parent, subs.item(i)); |
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343 } |
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344 } |
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345 } |
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346 |
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347 protected Boolean evaluateXPath(String expr) { |
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348 |
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349 if (log.isDebugEnabled()) { |
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350 log.debug("evaluate: '" + expr + "'"); |
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351 } |
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352 |
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353 try { |
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354 XPath xpath = XPATH_FACTORY.newXPath(); |
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355 xpath.setXPathVariableResolver(frames); |
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356 xpath.setXPathFunctionResolver(FunctionResolver.FUNCTIONS); |
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357 Object result = xpath.evaluate( |
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358 expr, EVAL_DOCUMENT, XPathConstants.BOOLEAN); |
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359 |
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360 return result instanceof Boolean |
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361 ? (Boolean)result |
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362 : null; |
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363 } |
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364 catch (XPathExpressionException xfce) { |
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365 log.error(xfce); |
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366 } |
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367 return null; |
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368 } |
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369 |
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370 protected void convert(Node parent, Element current) { |
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371 |
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372 String variable = expand(current.getAttribute("var")); |
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373 String type = expand(current.getAttribute("type")); |
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374 |
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375 if (frames.containsKey(variable)) { |
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376 Object object = TypeConverter.convert( |
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377 frames.get(variable), |
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378 type); |
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379 frames.put(variable, object); |
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380 } |
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381 } |
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382 |
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383 protected String expand(String s) { |
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384 Matcher m = CompiledStatement.VAR.matcher(s); |
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385 |
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386 StringBuffer sb = new StringBuffer(); |
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387 while (m.find()) { |
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388 String key = m.group(1); |
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389 Object value = frames.get(key); |
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390 m.appendReplacement(sb, value != null ? value.toString() : ""); |
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391 } |
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392 m.appendTail(sb); |
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393 return sb.toString(); |
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394 } |
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395 |
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396 protected void build(Node parent, Node current) |
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397 throws SQLException |
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398 { |
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399 String ns = current.getNamespaceURI(); |
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400 if (ns != null && ns.equals(DC_NAMESPACE_URI)) { |
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401 if (current.getNodeType() != Node.ELEMENT_NODE) { |
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402 log.warn("need elements here"); |
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403 } |
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404 else { |
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405 String localName = current.getLocalName(); |
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406 if ("attribute".equals(localName)) { |
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407 attribute(parent, (Element)current); |
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408 } |
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409 else if ("context".equals(localName)) { |
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410 context(parent, (Element)current); |
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411 } |
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412 else if ("if".equals(localName)) { |
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413 ifClause(parent, (Element)current); |
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414 } |
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415 else if ("choose".equals(localName)) { |
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416 choose(parent, (Element)current); |
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417 } |
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418 else if ("call-macro".equals(localName)) { |
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419 callMacro(parent, (Element)current); |
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Datacage: Moved templating in a better suited package.
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|
420 } |
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|
421 else if ("macro".equals(localName)) { |
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|
422 // simply ignore the definition. |
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423 } |
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Datacage: Moved templating in a better suited package.
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|
424 else if ("element".equals(localName)) { |
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Datacage: Moved templating in a better suited package.
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|
425 element(parent, (Element)current); |
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Datacage: Moved templating in a better suited package.
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|
426 } |
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Datacage: Moved templating in a better suited package.
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|
427 else if ("text".equals(localName)) { |
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Datacage: Moved templating in a better suited package.
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|
428 text(parent, (Element)current); |
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Datacage: Moved templating in a better suited package.
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|
429 } |
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Datacage: Moved templating in a better suited package.
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|
430 else if ("convert".equals(localName)) { |
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Datacage: Moved templating in a better suited package.
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|
431 convert(parent, (Element)current); |
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Datacage: Moved templating in a better suited package.
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|
432 } |
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Datacage: Moved templating in a better suited package.
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|
433 else { |
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Datacage: Moved templating in a better suited package.
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|
434 log.warn("unknown '" + localName + "' -> ignore"); |
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Datacage: Moved templating in a better suited package.
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parents:
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|
435 } |
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Datacage: Moved templating in a better suited package.
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436 } |
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437 return; |
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438 } |
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439 |
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440 if (current.getNodeType() == Node.TEXT_NODE) { |
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441 String txt = current.getNodeValue(); |
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442 if (txt != null && txt.trim().length() == 0) { |
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443 return; |
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444 } |
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Datacage: Moved templating in a better suited package.
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445 } |
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446 |
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447 Node copy = owner.importNode(current, false); |
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448 |
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449 NodeList children = current.getChildNodes(); |
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450 for (int i = 0, N = children.getLength(); i < N; ++i) { |
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451 build(copy, children.item(i)); |
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452 } |
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453 parent.appendChild(copy); |
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454 } |
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455 } // class BuildHelper |
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456 |
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457 |
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458 public Builder() { |
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459 compiledStatements = new HashMap<String, CompiledStatement>(); |
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460 } |
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461 |
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462 public Builder(Document template) { |
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463 this(); |
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464 this.template = template; |
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465 compileStatements(); |
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466 } |
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467 |
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468 protected void compileStatements() { |
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469 |
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470 NodeList nodes = template.getElementsByTagNameNS( |
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471 DC_NAMESPACE_URI, "statement"); |
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472 |
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473 for (int i = 0, N = nodes.getLength(); i < N; ++i) { |
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474 Element stmntElement = (Element)nodes.item(i); |
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475 String stmnt = trimStatement(stmntElement.getTextContent()); |
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476 if (stmnt == null || stmnt.length() == 0) { |
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477 throw new IllegalArgumentException("found empty statement"); |
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478 } |
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479 CompiledStatement cs = new CompiledStatement(stmnt); |
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480 // for faster lookup store a shortend string into the template |
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481 stmnt = "s" + i; |
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482 stmntElement.setTextContent(stmnt); |
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483 compiledStatements.put(stmnt, cs); |
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484 } |
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|
485 } |
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Datacage: Moved templating in a better suited package.
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486 |
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487 protected List<Node> rootsToList() { |
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488 |
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489 NodeList roots = template.getElementsByTagNameNS( |
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490 DC_NAMESPACE_URI, "template"); |
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491 |
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492 List<Node> elements = new ArrayList<Node>(); |
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493 |
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494 for (int i = 0, N = roots.getLength(); i < N; ++i) { |
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495 NodeList rootChildren = roots.item(i).getChildNodes(); |
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496 for (int j = 0, M = rootChildren.getLength(); j < M; ++j) { |
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497 Node child = rootChildren.item(j); |
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498 if (child.getNodeType() == Node.ELEMENT_NODE) { |
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499 elements.add(child); |
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|
500 } |
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|
501 } |
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|
502 } |
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Datacage: Moved templating in a better suited package.
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|
503 |
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504 return elements; |
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|
505 } |
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Datacage: Moved templating in a better suited package.
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|
506 |
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507 protected static final String trimStatement(String stmnt) { |
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508 if (stmnt == null) return null; |
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509 //XXX: Maybe a bit to radical for multiline strings? |
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510 return STRIP_LINE_INDENT.matcher(stmnt.trim()).replaceAll(" "); |
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|
511 } |
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Datacage: Moved templating in a better suited package.
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|
512 |
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|
513 protected static Document getOwnerDocument(Node node) { |
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Datacage: Moved templating in a better suited package.
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|
514 Document document = node.getOwnerDocument(); |
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|
515 return document != null ? document : (Document)node; |
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|
516 } |
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|
517 |
1011
aca3b46160cb
Added support for more than one db connection in datacage templating.
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998
diff
changeset
|
518 private static final List<NamedConnection> wrap(Connection connection) { |
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diff
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|
519 List<NamedConnection> list = new ArrayList<NamedConnection>(1); |
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diff
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|
520 list.add(new NamedConnection("", connection)); |
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Added support for more than one db connection in datacage templating.
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diff
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|
521 return list; |
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998
diff
changeset
|
522 } |
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Added support for more than one db connection in datacage templating.
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diff
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|
523 |
998
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|
524 public void build( |
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|
525 Connection connection, |
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diff
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|
526 Node output, |
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diff
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|
527 Map<String, Object> parameters |
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diff
changeset
|
528 ) |
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|
529 throws SQLException |
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parents:
diff
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|
530 { |
1011
aca3b46160cb
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parents:
998
diff
changeset
|
531 build(wrap(connection), output, parameters); |
aca3b46160cb
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parents:
998
diff
changeset
|
532 } |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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parents:
998
diff
changeset
|
533 |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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998
diff
changeset
|
534 public void build( |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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parents:
998
diff
changeset
|
535 List<NamedConnection> connections, |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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parents:
998
diff
changeset
|
536 Node output, |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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998
diff
changeset
|
537 Map<String, Object> parameters |
aca3b46160cb
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diff
changeset
|
538 ) |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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parents:
998
diff
changeset
|
539 throws SQLException |
aca3b46160cb
Added support for more than one db connection in datacage templating.
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parents:
998
diff
changeset
|
540 { |
aca3b46160cb
Added support for more than one db connection in datacage templating.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
998
diff
changeset
|
541 BuildHelper helper = new BuildHelper(output, connections, parameters); |
998
b81626b10cb7
Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
542 |
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Datacage: Moved templating in a better suited package.
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parents:
diff
changeset
|
543 helper.build(); |
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Datacage: Moved templating in a better suited package.
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parents:
diff
changeset
|
544 } |
b81626b10cb7
Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
545 } |
b81626b10cb7
Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
546 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |