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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java @ 976:d830c398c8f4

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Improved XPath handling for absent flags. flys-artifacts/trunk@2402 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 25 Jul 2011 14:12:14 +0000
parents 30c85cb33a50
children
rev   line source
959
a2b20ed3d3b4 Datacage: Added custom provider for XPath functions.
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1 package de.intevation.flys.artifacts.services.meta;
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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
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16 public class FunctionResolver
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17 implements XPathFunctionResolver
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18 {
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19 private static Logger log = Logger.getLogger(FunctionResolver.class);
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20
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21 public static final String FUNCTION_NAMESPACE_URI = "dc";
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22
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23 public static final class Entry {
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24
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25 String name;
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26 XPathFunction function;
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27 int arity;
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28
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29 public Entry() {
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30 }
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31
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32 public Entry(String name, XPathFunction function, int arity) {
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33 this.name = name;
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34 this.function = function;
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35 this.arity = arity;
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36 }
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37 } // class Entry
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38
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39 public static final FunctionResolver FUNCTIONS = new FunctionResolver();
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40
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41 static {
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42 FUNCTIONS.addFunction("contains", 2, new XPathFunction() {
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43 @Override
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44 public Object evaluate(List args) throws XPathFunctionException {
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45 Object haystack = args.get(0);
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46 Object needle = args.get(1);
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47 try {
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48 if (haystack instanceof Collection) {
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49 return Boolean.valueOf(
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50 ((Collection)haystack).contains(needle));
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51 }
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52
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53 if (haystack instanceof Map) {
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54 return Boolean.valueOf(
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55 ((Map)haystack).containsKey(needle));
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56 }
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57
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58 if (haystack instanceof Object []) {
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59 for (Object straw: (Object [])haystack) {
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60 if (straw.equals(needle)) {
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61 return Boolean.TRUE;
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62 }
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63 }
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64 }
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65
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66 return Boolean.FALSE;
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67 }
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68 catch (Exception e) {
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69 log.error(e);
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70 throw new XPathFunctionException(e);
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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
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76 protected List<Entry> functions;
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77
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78 public FunctionResolver() {
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79 functions = new ArrayList<Entry>();
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80 }
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81
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82 public void addFunction(String name, int arity, XPathFunction function) {
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83 functions.add(new Entry(name, function, arity));
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84 }
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85
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86 @Override
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87 public XPathFunction resolveFunction(QName functionName, int arity) {
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88
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89 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) {
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90 return null;
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91 }
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92
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93 String name = functionName.getLocalPart();
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94 for (Entry entry: functions) {
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95 if (entry.arity == arity && entry.name.equals(name)) {
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96 return entry.function;
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97 }
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98 }
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99
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100 return null;
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101 }
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102 }
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103 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org