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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java @ 974:30c85cb33a50

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meta data service: made artifact optional and allow passing extra parameters. flys-artifacts/trunk@2400 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 25 Jul 2011 11:05:33 +0000
parents a2b20ed3d3b4
children d830c398c8f4
rev   line source
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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 public class FunctionResolver
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15 implements XPathFunctionResolver
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16 {
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17 public static final String FUNCTION_NAMESPACE_URI = "dc";
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18
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19 public static final class Entry {
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20
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21 String name;
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22 XPathFunction function;
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23 int arity;
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24
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25 public Entry() {
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26 }
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27
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28 public Entry(String name, XPathFunction function, int arity) {
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29 this.name = name;
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30 this.function = function;
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31 this.arity = arity;
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32 }
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33 } // class Entry
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34
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35 public static final FunctionResolver FUNCTIONS = new FunctionResolver();
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36
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37 static {
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38 FUNCTIONS.addFunction("contains", 2, new XPathFunction() {
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39 @Override
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40 public Object evaluate(List args) throws XPathFunctionException {
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41 Object haystack = args.get(0);
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42 Object needle = args.get(1);
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43 try {
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44 if (haystack instanceof Collection) {
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45 return Boolean.valueOf(
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46 ((Collection)haystack).contains(needle));
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47 }
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48
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49 if (haystack instanceof Map) {
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50 return Boolean.valueOf(
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51 ((Map)haystack).containsKey(needle));
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52 }
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53
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54 if (haystack instanceof Object []) {
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55 for (Object straw: (Object [])haystack) {
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56 if (straw.equals(needle)) {
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57 return Boolean.TRUE;
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58 }
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59 }
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60 }
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61
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62 return Boolean.FALSE;
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63 }
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64 catch (Exception e) {
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65 throw new XPathFunctionException(e);
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66 }
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67 }
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68 });
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69 }
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70
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71 protected List<Entry> functions;
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72
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73 public FunctionResolver() {
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74 functions = new ArrayList<Entry>();
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75 }
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76
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77 public void addFunction(String name, int arity, XPathFunction function) {
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78 functions.add(new Entry(name, function, arity));
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79 }
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80
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81 @Override
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82 public XPathFunction resolveFunction(QName functionName, int arity) {
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83
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84 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) {
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85 return null;
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86 }
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87
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88 String name = functionName.getLocalPart();
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89 for (Entry entry: functions) {
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90 if (entry.arity == arity && entry.name.equals(name)) {
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91 return entry.function;
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92 }
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93 }
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95 return null;
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96 }
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97 }
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98 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org