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}