--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/FunctionResolver.java	Mon Aug 01 08:31:09 2011 +0000
@@ -0,0 +1,103 @@
+package de.intevation.flys.artifacts.datacage.templating;
+
+import java.util.List;
+import java.util.Collection;
+import java.util.Map;
+import java.util.ArrayList;
+
+import javax.xml.xpath.XPathFunctionResolver;
+import javax.xml.xpath.XPathFunction;
+import javax.xml.xpath.XPathFunctionException;
+
+import javax.xml.namespace.QName;
+
+import org.apache.log4j.Logger;
+
+public class FunctionResolver
+implements   XPathFunctionResolver
+{
+    private static Logger log = Logger.getLogger(FunctionResolver.class);
+
+    public static final String FUNCTION_NAMESPACE_URI = "dc";
+
+    public static final class Entry {
+
+        String        name;
+        XPathFunction function;
+        int           arity;
+
+        public Entry() {
+        }
+
+        public Entry(String name, XPathFunction function, int arity) {
+            this.name     = name;
+            this.function = function;
+            this.arity    = arity;
+        }
+    } // class Entry
+
+    public static final FunctionResolver FUNCTIONS = new FunctionResolver();
+
+    static {
+        FUNCTIONS.addFunction("contains", 2, new XPathFunction() {
+            @Override
+            public Object evaluate(List args) throws XPathFunctionException {
+                Object haystack = args.get(0);
+                Object needle   = args.get(1);
+                try {
+                    if (haystack instanceof Collection) {
+                        return Boolean.valueOf(
+                            ((Collection)haystack).contains(needle));
+                    }
+
+                    if (haystack instanceof Map) {
+                        return Boolean.valueOf(
+                            ((Map)haystack).containsKey(needle));
+                    }
+
+                    if (haystack instanceof Object []) {
+                        for (Object straw: (Object [])haystack) {
+                            if (straw.equals(needle)) {
+                                return Boolean.TRUE;
+                            }
+                        }
+                    }
+
+                    return Boolean.FALSE;
+                }
+                catch (Exception e) {
+                    log.error(e);
+                    throw new XPathFunctionException(e);
+                }
+            }
+        });
+    }
+
+    protected List<Entry> functions;
+
+    public FunctionResolver() {
+        functions = new ArrayList<Entry>();
+    }
+
+    public void addFunction(String name, int arity, XPathFunction function) {
+        functions.add(new Entry(name, function, arity));
+    }
+
+    @Override
+    public XPathFunction resolveFunction(QName functionName, int arity) {
+
+        if (!functionName.getNamespaceURI().equals(FUNCTION_NAMESPACE_URI)) {
+            return null;
+        }
+
+        String name = functionName.getLocalPart();
+        for (Entry entry: functions) {
+            if (entry.arity == arity && entry.name.equals(name)) {
+                return entry.function;
+            }
+        }
+
+        return null;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :