    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    package org.apache.commons.jxpath;
    018
    019    import java.util.Set;
    020
    021    /**
    022     * A group of Function objects sharing a common namespace or a set of
    023     * common namespaces. Use the classes
    024     * {@link ClassFunctions ClassFunctions} and
    025     * {@link PackageFunctions PackageFunctions}
    026     * to register extension functions implemented as Java methods.
    027     *
    028     * @author Dmitri Plotnikov
    029     * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
    030     */
    031    public interface Functions {
    032
    033        /**
    034         * Returns all namespaces in which this function collection defines
    035         * functions.
    036         * @return Set
    037         */
    038        Set getUsedNamespaces();
    039
    040        /**
    041         * Returns a Function, if any, for the specified namespace,
    042         * name and parameter types.
    043         * @param namespace ns
    044         * @param name function name
    045         * @param parameters Object[]
    046         * @return Function
    047         */
    048        Function getFunction(String namespace, String name, Object[] parameters);
    049    }