Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 4903:5ab87837622f
Sort the locations array in new datacage templating language functions.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Tue, 29 Jan 2013 17:42:04 +0100 |
parents | e1566938d04c |
children | 1e379598c47a |
rev | line source |
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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.Arrays; |
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4 import java.util.List; |
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5 import java.util.Collection; |
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6 import java.util.Map; |
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7 import java.util.ArrayList; |
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8 |
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9 import javax.xml.xpath.XPathFunctionResolver; |
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10 import javax.xml.xpath.XPathFunction; |
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11 import javax.xml.xpath.XPathFunctionException; |
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12 |
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13 import javax.xml.namespace.QName; |
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14 |
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15 import org.apache.log4j.Logger; |
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16 |
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18 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */ | |
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19 public class FunctionResolver |
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20 implements XPathFunctionResolver |
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21 { |
4594 | 22 /** Home logger. */ |
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23 private static Logger log = Logger.getLogger(FunctionResolver.class); |
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24 |
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25 public static final String FUNCTION_NAMESPACE_URI = "dc"; |
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26 |
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27 public static final class Entry { |
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28 |
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29 String name; |
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30 XPathFunction function; |
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31 int arity; |
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32 |
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33 public Entry() { |
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34 } |
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35 |
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36 public Entry(String name, XPathFunction function, int arity) { |
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37 this.name = name; |
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38 this.function = function; |
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39 this.arity = arity; |
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40 } |
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41 } // class Entry |
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42 |
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43 public static final FunctionResolver FUNCTIONS = new FunctionResolver(); |
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44 |
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45 static { |
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46 /** Implementation of case-ignoring dc:contains. */ |
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47 FUNCTIONS.addFunction("contains", 2, new XPathFunction() { |
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48 @Override |
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49 public Object evaluate(List args) throws XPathFunctionException { |
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50 Object haystack = args.get(0); |
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51 Object needle = args.get(1); |
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52 |
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53 if (needle instanceof String) { |
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54 needle = ((String)needle).toUpperCase(); |
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55 } |
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56 |
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57 try { |
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58 if (haystack instanceof Collection) { |
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59 return Boolean.valueOf( |
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60 ((Collection)haystack).contains(needle)); |
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61 } |
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62 |
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63 if (haystack instanceof Map) { |
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64 return Boolean.valueOf( |
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65 ((Map)haystack).containsKey(needle)); |
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66 } |
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67 |
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68 if (haystack instanceof Object []) { |
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69 for (Object straw: (Object [])haystack) { |
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70 if (straw.equals(needle)) { |
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71 return Boolean.TRUE; |
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72 } |
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73 } |
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74 } |
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75 |
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76 return Boolean.FALSE; |
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77 } |
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78 catch (Exception e) { |
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79 log.error(e); |
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80 throw new XPathFunctionException(e); |
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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 |
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86 static { |
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87 /** Implementation for getting the minimum value of location or distance |
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88 * dc:fromValue. */ |
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89 FUNCTIONS.addFunction("fromValue", 3, new XPathFunction() { |
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90 @Override |
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91 public Object evaluate(List args) throws XPathFunctionException { |
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92 Object mode = args.get(0); |
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93 Object locations = args.get(1); |
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94 Object from = args.get(2); |
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95 |
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96 if (!(mode instanceof String)){ |
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97 return -Double.MAX_VALUE; |
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98 } |
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99 |
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100 if (mode.equals("locations")) { |
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101 if (!(locations instanceof String)) { |
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102 return -Double.MAX_VALUE; |
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103 } |
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104 else { |
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105 String loc = ((String)locations).replace(" ", ""); |
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106 String[] split = loc.split(","); |
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107 Arrays.sort(split); |
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108 return split[0]; |
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109 } |
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110 } |
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111 else if (mode.equals("distance")) { |
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112 if (!(from instanceof String)) { |
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113 return -Double.MAX_VALUE; |
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114 } |
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115 String f = (String)from; |
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116 try { |
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117 return Double.parseDouble(f); |
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118 } |
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119 catch(NumberFormatException nfe) { |
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120 return -Double.MAX_VALUE; |
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121 } |
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122 } |
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123 else { |
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124 return -Double.MAX_VALUE; |
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125 } |
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126 } |
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127 }); |
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128 } |
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129 |
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130 static { |
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131 /** Implementation for getting the maximum value of location or distance |
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132 * dc:toValue. */ |
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133 FUNCTIONS.addFunction("toValue", 3, new XPathFunction() { |
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134 @Override |
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135 public Object evaluate(List args) throws XPathFunctionException { |
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136 Object mode = args.get(0); |
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137 Object locations = args.get(1); |
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138 Object to = args.get(2); |
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139 |
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140 if (!(mode instanceof String)){ |
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141 return Double.MAX_VALUE; |
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142 } |
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143 |
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144 if (mode.equals("locations")) { |
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145 if (!(locations instanceof String)) { |
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146 return Double.MAX_VALUE; |
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147 } |
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148 else { |
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149 String loc = ((String)locations).replace(" ", ""); |
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150 String[] split = loc.split(","); |
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151 Arrays.sort(split); |
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152 return split[split.length - 1]; |
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153 } |
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154 } |
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155 else if (mode.equals("distance")) { |
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156 if (!(to instanceof String)) { |
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157 return Double.MAX_VALUE; |
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158 } |
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159 else { |
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160 String t = (String)to; |
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161 try { |
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162 return Double.parseDouble(t); |
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163 } |
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164 catch(NumberFormatException nfe) { |
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165 return Double.MAX_VALUE; |
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166 } |
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167 } |
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168 } |
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169 else { |
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170 return Double.MAX_VALUE; |
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171 } |
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172 } |
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173 }); |
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174 } |
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175 |
4594 | 176 /** List of functions. */ |
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177 protected List<Entry> functions; |
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178 |
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179 public FunctionResolver() { |
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180 functions = new ArrayList<Entry>(); |
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181 } |
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182 |
4594 | 183 /** |
184 * Create a new function. | |
185 * @param name Name of the function. | |
186 * @param arity Number of arguments for function. | |
187 * @param function the function itself. | |
188 */ | |
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189 public void addFunction(String name, int arity, XPathFunction function) { |
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190 functions.add(new Entry(name, function, arity)); |
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191 } |
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192 |
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193 @Override |
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194 public XPathFunction resolveFunction(QName functionName, int arity) { |
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195 |
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196 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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197 return null; |
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198 } |
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199 |
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200 String name = functionName.getLocalPart(); |
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201 for (Entry entry: functions) { |
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202 if (entry.arity == arity && entry.name.equals(name)) { |
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203 return entry.function; |
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204 } |
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205 } |
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206 |
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207 return null; |
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208 } |
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209 } |
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210 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |