Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 5608:62513c9183ba
Datacage: Added dc:date-format to function resolver. Args: dc:date-format(pattern, date)
pattern obeys to java.text.SimpleDateFormat.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Tue, 09 Apr 2013 12:00:52 +0200 |
parents | 7e837c5c377b |
children | ce982943ab46 |
rev | line source |
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998
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Datacage: Moved templating in a better suited package.
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parents:
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1 package de.intevation.flys.artifacts.datacage.templating; |
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2 |
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Datacage: Added dc:date-format to function resolver. Args: dc:date-format(pattern, date)
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3 import java.text.SimpleDateFormat; |
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4 import java.util.ArrayList; |
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5 import java.util.Collection; |
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6 import java.util.Date; |
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7 import java.util.List; |
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8 import java.util.Map; |
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9 |
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10 import javax.xml.namespace.QName; |
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11 |
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12 import javax.xml.xpath.XPathFunction; |
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13 import javax.xml.xpath.XPathFunctionException; |
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14 import javax.xml.xpath.XPathFunctionResolver; |
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15 |
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16 import org.apache.log4j.Logger; |
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17 |
4594 | 18 |
19 /** Resolves functions (e.g. dc:contains) in Datacage/Meta-Data system. */ | |
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20 public class FunctionResolver |
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21 implements XPathFunctionResolver |
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22 { |
4594 | 23 /** Home logger. */ |
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24 private static Logger log = Logger.getLogger(FunctionResolver.class); |
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25 |
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26 public static final String FUNCTION_NAMESPACE_URI = "dc"; |
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27 |
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28 public static final double FAR_AWAY = 99999d; |
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29 |
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30 public static final class Entry { |
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31 |
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32 String name; |
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33 XPathFunction function; |
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34 int arity; |
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35 |
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36 public Entry() { |
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37 } |
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38 |
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39 public Entry(String name, XPathFunction function, int arity) { |
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40 this.name = name; |
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41 this.function = function; |
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42 this.arity = arity; |
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43 } |
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44 } // class Entry |
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45 |
4594 | 46 /** List of functions. */ |
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47 protected List<Entry> functions; |
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48 |
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49 protected Builder.BuildHelper buildHelper; |
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50 |
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51 |
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52 public FunctionResolver() { |
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53 this(null); |
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54 } |
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55 |
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56 public FunctionResolver(Builder.BuildHelper buildHelper) { |
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57 this.buildHelper = buildHelper; |
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58 |
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59 functions = new ArrayList<Entry>(); |
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60 |
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61 addFunction("contains", 2, new XPathFunction() { |
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62 @Override |
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63 public Object evaluate(List args) throws XPathFunctionException { |
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64 return contains(args); |
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65 } |
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66 }); |
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67 |
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68 addFunction("fromValue", 3, new XPathFunction() { |
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69 @Override |
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70 public Object evaluate(List args) throws XPathFunctionException { |
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71 return fromValue(args); |
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72 } |
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73 }); |
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74 |
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75 addFunction("toValue", 3, new XPathFunction() { |
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76 @Override |
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77 public Object evaluate(List args) throws XPathFunctionException { |
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78 return toValue(args); |
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79 } |
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80 }); |
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81 |
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82 addFunction("replace", 3, new XPathFunction() { |
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83 @Override |
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84 public Object evaluate(List args) throws XPathFunctionException { |
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85 return replace(args); |
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86 } |
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87 }); |
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88 |
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89 addFunction("has-result", 0, 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 return FunctionResolver.this.buildHelper.hasResult(); |
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93 } |
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94 }); |
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95 |
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96 addFunction("date-format", 2, new XPathFunction() { |
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97 @Override |
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98 public Object evaluate(List args) throws XPathFunctionException { |
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99 return dateFormat(args); |
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100 } |
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101 }); |
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102 } |
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103 |
4594 | 104 /** |
105 * Create a new function. | |
106 * @param name Name of the function. | |
107 * @param arity Number of arguments for function. | |
108 * @param function the function itself. | |
109 */ | |
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110 public void addFunction(String name, int arity, XPathFunction function) { |
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111 functions.add(new Entry(name, function, arity)); |
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112 } |
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113 |
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114 @Override |
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115 public XPathFunction resolveFunction(QName functionName, int arity) { |
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116 |
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117 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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118 return null; |
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119 } |
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120 |
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121 String name = functionName.getLocalPart(); |
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122 for (Entry entry: functions) { |
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123 if (entry.arity == arity && entry.name.equals(name)) { |
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124 return entry.function; |
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125 } |
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126 } |
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127 |
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128 return null; |
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129 } |
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130 |
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131 /** Implementation of case-ignoring dc:contains. */ |
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132 public Object contains(List args) throws XPathFunctionException { |
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133 Object haystack = args.get(0); |
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134 Object needle = args.get(1); |
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135 |
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136 if (needle instanceof String) { |
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137 needle = ((String)needle).toUpperCase(); |
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138 } |
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139 |
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140 try { |
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141 if (haystack instanceof Collection) { |
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142 return Boolean.valueOf( |
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143 ((Collection)haystack).contains(needle)); |
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144 } |
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145 |
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146 if (haystack instanceof Map) { |
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147 return Boolean.valueOf( |
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148 ((Map)haystack).containsKey(needle)); |
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149 } |
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150 |
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151 if (haystack instanceof Object []) { |
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152 for (Object straw: (Object [])haystack) { |
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153 if (straw.equals(needle)) { |
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154 return Boolean.TRUE; |
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155 } |
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156 } |
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157 } |
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158 |
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159 return Boolean.FALSE; |
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160 } |
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161 catch (Exception e) { |
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162 log.error(e); |
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163 throw new XPathFunctionException(e); |
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164 } |
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165 } |
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166 |
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167 /** Implementation for getting the minimum value of location or distance |
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168 * dc:fromValue. |
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169 */ |
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170 public Object fromValue(List args) throws XPathFunctionException { |
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171 Object mode = args.get(0); |
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172 Object locations = args.get(1); |
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173 Object from = args.get(2); |
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174 |
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175 if (!(mode instanceof String)){ |
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176 return -FAR_AWAY; |
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177 } |
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178 |
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179 if (mode.equals("locations")) { |
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180 if (!(locations instanceof String)) { |
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181 return -FAR_AWAY; |
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182 } |
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183 String loc = ((String)locations).replace(" ", ""); |
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184 String[] split = loc.split(","); |
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185 if (split.length < 1) { |
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186 return -FAR_AWAY; |
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187 } |
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188 try { |
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189 double min = Double.parseDouble(split[0]); |
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190 for (int i = 1; i < split.length; ++i) { |
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191 double v = Double.parseDouble(split[i]); |
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192 if (v < min) { |
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193 min = v; |
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194 } |
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195 } |
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196 return min; |
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197 } |
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198 catch (NumberFormatException nfe) { |
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199 return -FAR_AWAY; |
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200 } |
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201 } |
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202 else if (mode.equals("distance")) { |
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203 if (!(from instanceof String)) { |
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204 return -FAR_AWAY; |
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205 } |
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206 String f = (String)from; |
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207 try { |
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208 return Double.parseDouble(f); |
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209 } |
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210 catch(NumberFormatException nfe) { |
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211 return -FAR_AWAY; |
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212 } |
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213 } |
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214 else { |
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215 return -FAR_AWAY; |
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216 } |
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217 } |
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218 |
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219 /** Implementation for getting the maximum value of location or distance |
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220 * dc:toValue. |
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221 */ |
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222 public Object toValue(List args) throws XPathFunctionException { |
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223 Object mode = args.get(0); |
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224 Object locations = args.get(1); |
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225 Object to = args.get(2); |
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226 |
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227 if (!(mode instanceof String)){ |
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228 return FAR_AWAY; |
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229 } |
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230 |
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231 if (mode.equals("locations")) { |
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232 if (!(locations instanceof String)) { |
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233 return FAR_AWAY; |
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234 } |
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235 try { |
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236 String loc = ((String)locations).replace(" ", ""); |
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237 String[] split = loc.split(","); |
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238 if (split.length < 1) { |
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239 return FAR_AWAY; |
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240 } |
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241 double max = Double.parseDouble(split[0]); |
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242 for (int i = 1; i < split.length; ++i) { |
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243 double v = Double.parseDouble(split[i]); |
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244 if (v > max) { |
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245 max = v; |
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246 } |
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247 } |
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248 return max; |
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249 } |
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250 catch (NumberFormatException nfe) { |
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251 return FAR_AWAY; |
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252 } |
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253 } |
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254 else if (mode.equals("distance")) { |
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255 if (!(to instanceof String)) { |
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256 return FAR_AWAY; |
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257 } |
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258 else { |
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259 String t = (String)to; |
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260 try { |
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261 return Double.parseDouble(t); |
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262 } |
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263 catch(NumberFormatException nfe) { |
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264 return FAR_AWAY; |
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265 } |
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266 } |
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267 } |
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268 else { |
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269 return FAR_AWAY; |
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270 } |
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271 } |
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272 |
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273 /** Implementation for doing a string replace |
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274 * dc:replace |
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275 */ |
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276 public Object replace(List args) throws XPathFunctionException { |
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277 Object haystack = args.get(0); |
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278 Object needle = args.get(1); |
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279 Object replacement = args.get(2); |
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280 |
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281 if (needle instanceof String && |
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282 haystack instanceof String && |
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283 replacement instanceof String) { |
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284 return ((String)haystack).replace( |
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285 (String)needle, (String)replacement); |
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286 } else { |
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287 return haystack; |
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288 } |
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289 } |
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290 |
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291 public Object dateFormat(List args) throws XPathFunctionException { |
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292 Object pattern = args.get(0); |
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293 Object date = args.get(1); |
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294 if (pattern instanceof String && date instanceof Date) { |
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295 try { |
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296 // TODO: Take locale into account. |
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297 return new SimpleDateFormat((String)pattern).format((Date)date); |
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298 } |
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299 catch (IllegalArgumentException iae) { |
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300 throw new XPathFunctionException(iae); |
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301 } |
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302 } |
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303 return ""; |
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304 } |
998
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305 } |
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306 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |