Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/meta/FunctionResolver.java @ 959:a2b20ed3d3b4
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 |
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| 958:ae198bef4ba0 | 959:a2b20ed3d3b4 |
|---|---|
| 1 package de.intevation.flys.artifacts.services.meta; | |
| 2 | |
| 3 import java.util.List; | |
| 4 import java.util.ArrayList; | |
| 5 | |
| 6 import javax.xml.xpath.XPathFunctionResolver; | |
| 7 import javax.xml.xpath.XPathFunction; | |
| 8 import javax.xml.xpath.XPathFunctionException; | |
| 9 | |
| 10 import javax.xml.namespace.QName; | |
| 11 | |
| 12 public class FunctionResolver | |
| 13 implements XPathFunctionResolver | |
| 14 { | |
| 15 public static final String FUNCTION_NAMESPACE_URI = "dc"; | |
| 16 | |
| 17 public static final class Entry { | |
| 18 | |
| 19 String name; | |
| 20 XPathFunction function; | |
| 21 int arity; | |
| 22 | |
| 23 public Entry() { | |
| 24 } | |
| 25 | |
| 26 public Entry(String name, XPathFunction function, int arity) { | |
| 27 this.name = name; | |
| 28 this.function = function; | |
| 29 this.arity = arity; | |
| 30 } | |
| 31 } // class Entry | |
| 32 | |
| 33 public static final FunctionResolver FUNCTIONS = new FunctionResolver(); | |
| 34 | |
| 35 static { | |
| 36 FUNCTIONS.addFunction("contains", 2, new XPathFunction() { | |
| 37 @Override | |
| 38 public Object evaluate(List args) throws XPathFunctionException { | |
| 39 try { | |
| 40 Object [] haystack = (Object [])args.get(0); | |
| 41 Object needle = args.get(1); | |
| 42 for (Object straw: haystack) { | |
| 43 if (straw.equals(needle)) { | |
| 44 return Boolean.TRUE; | |
| 45 } | |
| 46 } | |
| 47 return Boolean.FALSE; | |
| 48 } | |
| 49 catch (Exception e) { | |
| 50 throw new XPathFunctionException(e); | |
| 51 } | |
| 52 } | |
| 53 }); | |
| 54 } | |
| 55 | |
| 56 protected List<Entry> functions; | |
| 57 | |
| 58 public FunctionResolver() { | |
| 59 functions = new ArrayList<Entry>(); | |
| 60 } | |
| 61 | |
| 62 public void addFunction(String name, int arity, XPathFunction function) { | |
| 63 functions.add(new Entry(name, function, arity)); | |
| 64 } | |
| 65 | |
| 66 @Override | |
| 67 public XPathFunction resolveFunction(QName functionName, int arity) { | |
| 68 | |
| 69 if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) { | |
| 70 return null; | |
| 71 } | |
| 72 | |
| 73 String name = functionName.getLocalPart(); | |
| 74 for (Entry entry: functions) { | |
| 75 if (entry.arity == arity && entry.name.equals(name)) { | |
| 76 return entry.function; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 return null; | |
| 81 } | |
| 82 } | |
| 83 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |