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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java @ 959:a2b20ed3d3b4

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Datacage: Added custom provider for XPath functions. flys-artifacts/trunk@2378 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 20 Jul 2011 16:28:49 +0000
parents
children 30c85cb33a50
rev   line source
959
a2b20ed3d3b4 Datacage: Added custom provider for XPath functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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.ArrayList;
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5
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6 import javax.xml.xpath.XPathFunctionResolver;
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7 import javax.xml.xpath.XPathFunction;
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8 import javax.xml.xpath.XPathFunctionException;
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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 public class FunctionResolver
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13 implements XPathFunctionResolver
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14 {
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15 public static final String FUNCTION_NAMESPACE_URI = "dc";
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16
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17 public static final class Entry {
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18
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19 String name;
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20 XPathFunction function;
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21 int arity;
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22
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23 public Entry() {
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24 }
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25
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26 public Entry(String name, XPathFunction function, int arity) {
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27 this.name = name;
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28 this.function = function;
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29 this.arity = arity;
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30 }
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31 } // class Entry
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32
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33 public static final FunctionResolver FUNCTIONS = new FunctionResolver();
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34
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35 static {
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36 FUNCTIONS.addFunction("contains", 2, new XPathFunction() {
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37 @Override
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38 public Object evaluate(List args) throws XPathFunctionException {
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39 try {
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40 Object [] haystack = (Object [])args.get(0);
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41 Object needle = args.get(1);
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42 for (Object straw: haystack) {
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43 if (straw.equals(needle)) {
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44 return Boolean.TRUE;
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45 }
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46 }
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47 return Boolean.FALSE;
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48 }
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49 catch (Exception e) {
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50 throw new XPathFunctionException(e);
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51 }
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52 }
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53 });
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54 }
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55
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56 protected List<Entry> functions;
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57
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58 public FunctionResolver() {
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59 functions = new ArrayList<Entry>();
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60 }
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61
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62 public void addFunction(String name, int arity, XPathFunction function) {
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63 functions.add(new Entry(name, function, arity));
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64 }
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65
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66 @Override
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67 public XPathFunction resolveFunction(QName functionName, int arity) {
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68
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69 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) {
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70 return null;
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71 }
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72
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73 String name = functionName.getLocalPart();
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74 for (Entry entry: functions) {
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75 if (entry.arity == arity && entry.name.equals(name)) {
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76 return entry.function;
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77 }
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78 }
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79
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80 return null;
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81 }
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82 }
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83 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org