1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jxpath;
18
19 import java.util.Set;
20
21 /**
22 * A group of Function objects sharing a common namespace or a set of
23 * common namespaces. Use the classes
24 * {@link ClassFunctions ClassFunctions} and
25 * {@link PackageFunctions PackageFunctions}
26 * to register extension functions implemented as Java methods.
27 *
28 * @author Dmitri Plotnikov
29 * @version $Revision: 652845 $ $Date: 2008-05-02 19:46:46 +0200 (Fr, 02 Mai 2008) $
30 */
31 public interface Functions {
32
33 /**
34 * Returns all namespaces in which this function collection defines
35 * functions.
36 * @return Set
37 */
38 Set getUsedNamespaces();
39
40 /**
41 * Returns a Function, if any, for the specified namespace,
42 * name and parameter types.
43 * @param namespace ns
44 * @param name function name
45 * @param parameters Object[]
46 * @return Function
47 */
48 Function getFunction(String namespace, String name, Object[] parameters);
49 }