fix #390 - reverse the algorithm for matching against registered classes

(cherry picked from commit 1ae5bd9)

Author: sammefford

src/main/java/com/marklogic/client/impl/HandleFactoryRegistryImpl.java

@@ -126,21 +126,14 @@ public HandleFactoryRegistry copy() {
 		return copy;
 	}
 	Class<?> getRegisteredType(Class<?> type) {
-		while (type != null && !type.isAssignableFrom(Object.class)) {
-			if (factories.containsKey(type)) {
-				return type;
-			}
-
-			Class<?>[] interfaces = type.getInterfaces();
-			if (interfaces != null) {
-				for (Class<?> interfaceType: interfaces) {
-					if (factories.containsKey(interfaceType)) {
-						return interfaceType;
-					}
-				}
+		if ( type == null ) throw new IllegalArgumentException("type must not be null");
+		if (factories.containsKey(type)) {
+			return type;
+		}
+		for ( Class<?> registeredClass : factories.keySet() ) {
+			if ( registeredClass.isAssignableFrom(type) ) {
+				return registeredClass;
 			}
-
-			type = type.getSuperclass();
 		}
 
 		return null;