001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.jxpath; 019 020import java.util.Set; 021 022/** 023 * A group of Function objects sharing a common namespace or a set of common namespaces. Use the classes {@link ClassFunctions ClassFunctions} and 024 * {@link PackageFunctions PackageFunctions} to register extension functions implemented as Java methods. 025 */ 026public interface Functions { 027 028 /** 029 * Gets a Function, if any, for the specified namespace, name and parameter types. 030 * 031 * @param namespace ns 032 * @param name function name 033 * @param parameters Object[] 034 * @return Function 035 */ 036 Function getFunction(String namespace, String name, Object[] parameters); 037 038 /** 039 * Gets all namespaces in which this function collection defines functions. 040 * 041 * @return all namespaces in which this function collection defines functions. 042 */ 043 Set<String> getUsedNamespaces(); 044}