Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/FunctionResolver.java @ 5863:4897a58c8746
River artifacts: Added new copyright headers.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 14:40:59 +0200 |
parents | 5aa05a7a34b7 |
children | 6ea004d51203 |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.datacage.templating; |
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10 |
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11 import java.text.SimpleDateFormat; |
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12 import java.util.ArrayList; |
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13 import java.util.Collection; |
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14 import java.util.Date; |
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15 import java.util.List; |
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16 import java.util.Map; |
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17 |
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18 import java.lang.reflect.InvocationTargetException; |
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19 import java.lang.reflect.Method; |
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20 |
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21 import javax.xml.namespace.QName; |
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22 |
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23 import javax.xml.xpath.XPathFunction; |
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24 import javax.xml.xpath.XPathFunctionException; |
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25 import javax.xml.xpath.XPathFunctionResolver; |
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26 |
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27 import org.apache.log4j.Logger; |
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28 |
4594 | 29 |
30 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */ | |
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31 public class FunctionResolver |
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32 implements XPathFunctionResolver |
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33 { |
4594 | 34 /** Home logger. */ |
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35 private static Logger log = Logger.getLogger(FunctionResolver.class); |
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36 |
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37 public static final String FUNCTION_NAMESPACE_URI = "dc"; |
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38 |
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39 public static final double FAR_AWAY = 99999d; |
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40 |
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41 public static final class Entry { |
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42 |
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43 String name; |
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44 XPathFunction function; |
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45 int arity; |
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46 |
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47 public Entry() { |
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48 } |
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49 |
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50 public Entry(String name, XPathFunction function, int arity) { |
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51 this.name = name; |
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52 this.function = function; |
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53 this.arity = arity; |
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54 } |
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55 } // class Entry |
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56 |
4594 | 57 /** List of functions. */ |
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58 protected List<Entry> functions; |
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59 |
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60 protected Builder.BuildHelper buildHelper; |
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61 |
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62 |
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63 public FunctionResolver() { |
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64 this(null); |
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65 } |
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66 |
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67 public FunctionResolver(Builder.BuildHelper buildHelper) { |
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68 this.buildHelper = buildHelper; |
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69 |
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70 functions = new ArrayList<Entry>(); |
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71 |
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72 addFunction("contains", 2, new XPathFunction() { |
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73 @Override |
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74 public Object evaluate(List args) throws XPathFunctionException { |
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75 return contains(args); |
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76 } |
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77 }); |
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78 |
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79 addFunction("fromValue", 3, new XPathFunction() { |
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80 @Override |
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81 public Object evaluate(List args) throws XPathFunctionException { |
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82 return fromValue(args); |
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83 } |
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84 }); |
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85 |
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86 addFunction("toValue", 3, new XPathFunction() { |
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87 @Override |
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88 public Object evaluate(List args) throws XPathFunctionException { |
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89 return toValue(args); |
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90 } |
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91 }); |
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92 |
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93 addFunction("replace", 3, new XPathFunction() { |
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94 @Override |
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95 public Object evaluate(List args) throws XPathFunctionException { |
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96 return replace(args); |
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97 } |
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98 }); |
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99 |
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100 addFunction("has-result", 0, new XPathFunction() { |
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101 @Override |
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102 public Object evaluate(List args) throws XPathFunctionException { |
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103 return FunctionResolver.this.buildHelper.hasResult(); |
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104 } |
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105 }); |
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106 |
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107 addFunction("date-format", 2, new XPathFunction() { |
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108 @Override |
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109 public Object evaluate(List args) throws XPathFunctionException { |
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110 return dateFormat(args); |
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111 } |
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112 }); |
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113 } |
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114 |
4594 | 115 /** |
116 * Create a new function. | |
117 * @param name Name of the function. | |
118 * @param arity Number of arguments for function. | |
119 * @param function the function itself. | |
120 */ | |
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121 public void addFunction(String name, int arity, XPathFunction function) { |
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122 functions.add(new Entry(name, function, arity)); |
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123 } |
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124 |
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125 @Override |
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126 public XPathFunction resolveFunction(QName functionName, int arity) { |
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127 |
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128 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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129 return null; |
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130 } |
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131 |
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132 String name = functionName.getLocalPart(); |
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133 for (Entry entry: functions) { |
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134 if (entry.arity == arity && entry.name.equals(name)) { |
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135 return entry.function; |
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136 } |
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137 } |
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138 |
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139 return null; |
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140 } |
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141 |
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142 /** Implementation of case-ignoring dc:contains. */ |
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143 public Object contains(List args) throws XPathFunctionException { |
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144 Object haystack = args.get(0); |
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145 Object needle = args.get(1); |
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146 |
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147 if (needle instanceof String && !(haystack instanceof String)) { |
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148 needle = ((String)needle).toUpperCase(); |
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149 } |
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150 |
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151 try { |
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152 if (haystack instanceof Collection) { |
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153 return Boolean.valueOf( |
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154 ((Collection)haystack).contains(needle)); |
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155 } |
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156 |
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157 if (haystack instanceof Map) { |
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158 return Boolean.valueOf( |
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159 ((Map)haystack).containsKey(needle)); |
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160 } |
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161 |
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162 if (haystack instanceof Object []) { |
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163 for (Object straw: (Object [])haystack) { |
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164 if (straw.equals(needle)) { |
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165 return Boolean.TRUE; |
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166 } |
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167 } |
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168 } |
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169 |
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170 if (haystack instanceof String && needle instanceof String) { |
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171 String h = (String)haystack; |
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172 String n = (String)needle; |
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173 return h.contains(n); |
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174 } |
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175 |
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176 return Boolean.FALSE; |
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177 } |
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178 catch (Exception e) { |
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179 log.error(e); |
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180 throw new XPathFunctionException(e); |
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181 } |
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182 } |
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183 |
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184 /** Implementation for getting the minimum value of location or distance |
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185 * dc:fromValue. |
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186 */ |
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187 public Object fromValue(List args) throws XPathFunctionException { |
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188 Object mode = args.get(0); |
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189 Object locations = args.get(1); |
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190 Object from = args.get(2); |
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191 |
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192 if (!(mode instanceof String)){ |
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193 return -FAR_AWAY; |
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194 } |
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195 |
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196 if (mode.equals("locations")) { |
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197 if (!(locations instanceof String)) { |
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198 return -FAR_AWAY; |
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199 } |
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200 String loc = ((String)locations).replace(" ", ""); |
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201 String[] split = loc.split(","); |
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202 if (split.length < 1) { |
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203 return -FAR_AWAY; |
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204 } |
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205 try { |
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206 double min = Double.parseDouble(split[0]); |
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207 for (int i = 1; i < split.length; ++i) { |
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208 double v = Double.parseDouble(split[i]); |
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209 if (v < min) { |
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210 min = v; |
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211 } |
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212 } |
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213 return min; |
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214 } |
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215 catch (NumberFormatException nfe) { |
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216 return -FAR_AWAY; |
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217 } |
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218 } |
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219 else if (mode.equals("distance")) { |
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220 if (!(from instanceof String)) { |
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221 return -FAR_AWAY; |
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222 } |
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223 String f = (String)from; |
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224 try { |
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225 return Double.parseDouble(f); |
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226 } |
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227 catch(NumberFormatException nfe) { |
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228 return -FAR_AWAY; |
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229 } |
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230 } |
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231 else { |
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232 return -FAR_AWAY; |
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233 } |
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234 } |
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235 |
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236 /** Implementation for getting the maximum value of location or distance |
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237 * dc:toValue. |
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238 */ |
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239 public Object toValue(List args) throws XPathFunctionException { |
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240 Object mode = args.get(0); |
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241 Object locations = args.get(1); |
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242 Object to = args.get(2); |
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243 |
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244 if (!(mode instanceof String)){ |
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245 return FAR_AWAY; |
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246 } |
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247 |
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248 if (mode.equals("locations")) { |
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249 if (!(locations instanceof String)) { |
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250 return FAR_AWAY; |
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251 } |
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252 try { |
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253 String loc = ((String)locations).replace(" ", ""); |
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254 String[] split = loc.split(","); |
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255 if (split.length < 1) { |
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256 return FAR_AWAY; |
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257 } |
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258 double max = Double.parseDouble(split[0]); |
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259 for (int i = 1; i < split.length; ++i) { |
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260 double v = Double.parseDouble(split[i]); |
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261 if (v > max) { |
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262 max = v; |
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263 } |
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264 } |
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265 return max; |
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266 } |
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267 catch (NumberFormatException nfe) { |
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268 return FAR_AWAY; |
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269 } |
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270 } |
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271 else if (mode.equals("distance")) { |
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272 if (!(to instanceof String)) { |
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273 return FAR_AWAY; |
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274 } |
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275 else { |
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276 String t = (String)to; |
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277 try { |
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278 return Double.parseDouble(t); |
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279 } |
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280 catch(NumberFormatException nfe) { |
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281 return FAR_AWAY; |
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282 } |
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283 } |
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284 } |
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285 else { |
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286 return FAR_AWAY; |
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287 } |
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288 } |
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289 |
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290 /** Implementation for doing a string replace |
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291 * dc:replace |
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292 */ |
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293 public Object replace(List args) throws XPathFunctionException { |
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294 Object haystack = args.get(0); |
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295 Object needle = args.get(1); |
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296 Object replacement = args.get(2); |
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297 |
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298 if (needle instanceof String && |
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299 haystack instanceof String && |
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300 replacement instanceof String) { |
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301 return ((String)haystack).replace( |
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302 (String)needle, (String)replacement); |
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303 } else { |
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304 return haystack; |
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305 } |
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306 } |
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307 |
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308 public Object dateFormat(List args) throws XPathFunctionException { |
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309 Object pattern = args.get(0); |
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310 Object date = args.get(1); |
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311 |
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312 try { |
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313 // Oracle does not return a date object but an oracle.sql.TIMESTAMP |
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314 Method meth = date.getClass().getMethod("dateValue", new Class[] {}); |
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315 date = meth.invoke(date, new Object [] {}); |
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316 } catch (IllegalArgumentException e) { |
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317 } catch (IllegalAccessException e) { |
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318 } catch (InvocationTargetException e) { |
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319 } catch (NoSuchMethodException e) { |
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320 } |
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321 if (pattern instanceof String && date instanceof Date) { |
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322 try { |
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323 // TODO: Take locale into account. |
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324 return new SimpleDateFormat((String)pattern).format((Date)date); |
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325 } |
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326 catch (IllegalArgumentException iae) { |
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327 throw new XPathFunctionException(iae); |
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328 } |
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329 } |
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330 return ""; |
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331 } |
998
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332 } |
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333 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |