Functions


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.jxpath;
17  
18  import java.util.Set  ;
19  
20  /**
21   * A group of Function objects sharing a common namespace or a set of
22   * common namespaces. Use the classes
23   * {@link ClassFunctions ClassFunctions} and 
24   * {@link PackageFunctions PackageFunctions}
25   * to register extension functions implemented as Java methods.
26   *
27   * @author Dmitri Plotnikov
28   * @version $Revision: 1.7 $ $Date: 2004/02/29 14:17:42 $
29   */
30  public interface Functions {
31  
32      /**
33       * Returns all namespaces in which this function collection defines
34       * functions.
35       */
36      Set   getUsedNamespaces();
37  
38      /**
39       * Returns a Function, if any, for the specified namespace,
40       * name and parameter types.
41       */
42      Function getFunction(String   namespace, String   name, Object  [] parameters);
43  }

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