001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *  http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package javax.activation;
021    
022    /**
023     * @version $Rev: 467553 $ $Date: 2006-10-24 21:01:51 -0700 (Tue, 24 Oct 2006) $
024     */
025    public abstract class CommandMap {
026        private static CommandMap defaultCommandMap = new MailcapCommandMap();
027    
028        /**
029         * Return the default CommandMap. If this has not been explictly set
030         * using setDefaultCommandMap() then a MailcapCommandMap is returned.
031         * @return the default CommandMap
032         */
033        public static CommandMap getDefaultCommandMap() {
034            return defaultCommandMap;
035        }
036    
037        /**
038         * Set the default CommandMap.
039         *
040         * @param commandMap the new default CommandMap; if null resets to a MailcapCommandMap 
041         * @throws SecurityException if the caller does not have "SetFactory" RuntimePermission
042         */
043        public static void setDefaultCommandMap(CommandMap commandMap) {
044            SecurityManager sm = System.getSecurityManager();
045            if (sm != null) {
046                sm.checkSetFactory();
047            }
048            defaultCommandMap = commandMap == null ? new MailcapCommandMap() : commandMap;
049        }
050    
051        public CommandMap() {
052        }
053    
054        public abstract CommandInfo[] getPreferredCommands(String mimeType);
055    
056        public abstract CommandInfo[] getAllCommands(String mimeType);
057    
058        public abstract CommandInfo getCommand(String mimeType, String cmdName);
059    
060        public abstract DataContentHandler createDataContentHandler(String mimeType);
061    }