    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}