Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java @ 4594:2970046fcdca
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author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 29 Nov 2012 11:48:20 +0100 |
parents | de0c2bbb27f9 |
children | e1566938d04c |
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.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 |
4594 | 16 |
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 { |
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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 |
4594 | 85 /** List of functions. */ |
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86 protected List<Entry> functions; |
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87 |
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88 public FunctionResolver() { |
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89 functions = new ArrayList<Entry>(); |
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90 } |
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91 |
4594 | 92 /** |
93 * Create a new function. | |
94 * @param name Name of the function. | |
95 * @param arity Number of arguments for function. | |
96 * @param function the function itself. | |
97 */ | |
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98 public void addFunction(String name, int arity, XPathFunction function) { |
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99 functions.add(new Entry(name, function, arity)); |
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100 } |
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101 |
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102 @Override |
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103 public XPathFunction resolveFunction(QName functionName, int arity) { |
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104 |
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105 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { |
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106 return null; |
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107 } |
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108 |
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109 String name = functionName.getLocalPart(); |
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110 for (Entry entry: functions) { |
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111 if (entry.arity == arity && entry.name.equals(name)) { |
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112 return entry.function; |
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113 } |
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114 } |
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115 |
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116 return null; |
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117 } |
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Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
118 } |
b81626b10cb7
Datacage: Moved templating in a better suited package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |