Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 4902:e1566938d04c
Added new functions to datacage templating language.
* get minimum of location/distance:
dc:fromValue($ld_mode, $ld_locations, $ld_from)
- returns -Double.MAX_VALUE if no min exists.
* get maximum of location/distance:
dc:toValue($ld_mode, $ld_locations, $ld_to)
- returns Double.MAX_VALUE if no max exists.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Tue, 29 Jan 2013 17:11:26 +0100 |
parents | 2970046fcdca |
children | 5ab87837622f |
rev | line source |
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998
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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.List; |
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4 import java.util.Collection; |
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5 import java.util.Map; |
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6 import java.util.ArrayList; |
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7 |
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8 import javax.xml.xpath.XPathFunctionResolver; |
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9 import javax.xml.xpath.XPathFunction; |
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10 import javax.xml.xpath.XPathFunctionException; |
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11 |
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12 import javax.xml.namespace.QName; |
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13 |
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14 import org.apache.log4j.Logger; |
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15 |
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17 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */ | |
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18 public class FunctionResolver |
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19 implements XPathFunctionResolver |
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20 { |
4594 | 21 /** Home logger. */ |
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22 private static Logger log = Logger.getLogger(FunctionResolver.class); |
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23 |
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24 public static final String FUNCTION_NAMESPACE_URI = "dc"; |
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25 |
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26 public static final class Entry { |
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27 |
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28 String name; |
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29 XPathFunction function; |
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30 int arity; |
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31 |
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32 public Entry() { |
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33 } |
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34 |
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35 public Entry(String name, XPathFunction function, int arity) { |
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36 this.name = name; |
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37 this.function = function; |
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38 this.arity = arity; |
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39 } |
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40 } // class Entry |
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41 |
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42 public static final FunctionResolver FUNCTIONS = new FunctionResolver(); |
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43 |
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44 static { |
1930
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Cosmetics, docs.
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45 /** Implementation of case-ignoring dc:contains. */ |
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46 FUNCTIONS.addFunction("contains", 2, new XPathFunction() { |
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47 @Override |
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48 public Object evaluate(List args) throws XPathFunctionException { |
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49 Object haystack = args.get(0); |
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50 Object needle = args.get(1); |
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51 |
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52 if (needle instanceof String) { |
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53 needle = ((String)needle).toUpperCase(); |
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54 } |
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55 |
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56 try { |
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57 if (haystack instanceof Collection) { |
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58 return Boolean.valueOf( |
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59 ((Collection)haystack).contains(needle)); |
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60 } |
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61 |
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62 if (haystack instanceof Map) { |
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63 return Boolean.valueOf( |
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64 ((Map)haystack).containsKey(needle)); |
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65 } |
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66 |
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67 if (haystack instanceof Object []) { |
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68 for (Object straw: (Object [])haystack) { |
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69 if (straw.equals(needle)) { |
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70 return Boolean.TRUE; |
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71 } |
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72 } |
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73 } |
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74 |
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75 return Boolean.FALSE; |
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76 } |
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77 catch (Exception e) { |
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78 log.error(e); |
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79 throw new XPathFunctionException(e); |
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80 } |
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81 } |
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82 }); |
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83 } |
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84 |
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85 static { |
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86 /** Implementation for getting the minimum value of location or distance |
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87 * dc:fromValue. */ |
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88 FUNCTIONS.addFunction("fromValue", 3, new XPathFunction() { |
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89 @Override |
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90 public Object evaluate(List args) throws XPathFunctionException { |
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91 Object mode = args.get(0); |
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92 Object locations = args.get(1); |
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93 Object from = args.get(2); |
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94 |
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95 if (!(mode instanceof String)){ |
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96 return -Double.MAX_VALUE; |
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97 } |
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98 |
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99 if (mode.equals("locations")) { |
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100 if (!(locations instanceof String)) { |
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101 return -Double.MAX_VALUE; |
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102 } |
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103 else { |
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104 String loc = ((String)locations).replace(" ", ""); |
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105 String[] split = loc.split(","); |
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106 return split[0]; |
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107 } |
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108 } |
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109 else if (mode.equals("distance")) { |
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110 if (!(from instanceof String)) { |
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111 return -Double.MAX_VALUE; |
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112 } |
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113 String f = (String)from; |
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114 try { |
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115 return Double.parseDouble(f); |
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116 } |
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117 catch(NumberFormatException nfe) { |
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118 return -Double.MAX_VALUE; |
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119 } |
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120 } |
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121 else { |
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122 return -Double.MAX_VALUE; |
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123 } |
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124 } |
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125 }); |
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126 } |
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127 |
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128 static { |
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129 /** Implementation for getting the maximum value of location or distance |
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130 * dc:toValue. */ |
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131 FUNCTIONS.addFunction("toValue", 3, new XPathFunction() { |
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132 @Override |
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133 public Object evaluate(List args) throws XPathFunctionException { |
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134 Object mode = args.get(0); |
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135 Object locations = args.get(1); |
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136 Object to = args.get(2); |
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137 |
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138 if (!(mode instanceof String)){ |
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139 return Double.MAX_VALUE; |
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140 } |
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141 |
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142 if (mode.equals("locations")) { |
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143 if (!(locations instanceof String)) { |
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144 return Double.MAX_VALUE; |
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145 } |
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146 else { |
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147 String loc = ((String)locations).replace(" ", ""); |
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148 String[] split = loc.split(","); |
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149 return split[split.length - 1]; |
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150 } |
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151 } |
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152 else if (mode.equals("distance")) { |
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153 if (!(to instanceof String)) { |
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154 return Double.MAX_VALUE; |
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155 } |
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156 else { |
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157 String t = (String)to; |
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158 try { |
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159 return Double.parseDouble(t); |
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160 } |
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161 catch(NumberFormatException nfe) { |
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162 return Double.MAX_VALUE; |
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163 } |
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164 } |
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165 } |
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166 else { |
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167 return Double.MAX_VALUE; |
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168 } |
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169 } |
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170 }); |
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171 } |
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172 |
4594 | 173 /** List of functions. */ |
998
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174 protected List<Entry> functions; |
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175 |
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176 public FunctionResolver() { |
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177 functions = new ArrayList<Entry>(); |
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178 } |
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179 |
4594 | 180 /** |
181 * Create a new function. | |
182 * @param name Name of the function. | |
183 * @param arity Number of arguments for function. | |
184 * @param function the function itself. | |
185 */ | |
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186 public void addFunction(String name, int arity, XPathFunction function) { |
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187 functions.add(new Entry(name, function, arity)); |
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188 } |
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189 |
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190 @Override |
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191 public XPathFunction resolveFunction(QName functionName, int arity) { |
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192 |
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193 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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194 return null; |
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195 } |
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196 |
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197 String name = functionName.getLocalPart(); |
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198 for (Entry entry: functions) { |
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199 if (entry.arity == arity && entry.name.equals(name)) { |
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200 return entry.function; |
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201 } |
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202 } |
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203 |
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204 return null; |
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205 } |
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206 } |
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207 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |