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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>
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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16
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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 {
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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
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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
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92 /**
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93 * Create a new function.
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94 * @param name Name of the function.
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95 * @param arity Number of arguments for function.
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96 * @param function the function itself.
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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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118 }
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119 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org