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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  
18  package org.apache.commons.jxpath;
19  
20  import java.util.Set;
21  
22  /**
23   * A group of Function objects sharing a common namespace or a set of common namespaces. Use the classes {@link ClassFunctions ClassFunctions} and
24   * {@link PackageFunctions PackageFunctions} to register extension functions implemented as Java methods.
25   */
26  public interface Functions {
27  
28      /**
29       * Gets a Function, if any, for the specified namespace, name and parameter types.
30       *
31       * @param namespace  ns
32       * @param name       function name
33       * @param parameters Object[]
34       * @return Function
35       */
36      Function getFunction(String namespace, String name, Object[] parameters);
37  
38      /**
39       * Gets all namespaces in which this function collection defines functions.
40       *
41       * @return all namespaces in which this function collection defines functions.
42       */
43      Set<String> getUsedNamespaces();
44  }