001    /*
002     * Copyright 2002-2004 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.richclient.command;
017    
018    import java.util.EventObject;
019    
020    import org.springframework.richclient.util.Assert;
021    
022    /**
023     * An event object that originated from a {@link CommandRegistry}.
024     *
025     */
026    public class CommandRegistryEvent extends EventObject {
027    
028        private static final long serialVersionUID = 740046110521079234L;
029        
030        private final AbstractCommand command;
031    
032        /**
033         * Creates a new {@code CommandRegistryEvent} for the given registry and command.
034         *
035         * @param source The command registry that originated the event. Must not be null.
036         * @param command The command that the event relates to. Must not be null.
037         * 
038         * @throws IllegalArgumentException if either argument is null.
039         */
040        public CommandRegistryEvent(CommandRegistry source, AbstractCommand command) {
041            super(source);
042            Assert.required(source, "source");
043            Assert.required(command, "command");
044            this.command = command;
045        }
046    
047        /**
048         * Returns the command that the event relates to.
049         *
050         * @return The command, never null.
051         */
052        public AbstractCommand getCommand() {
053            return command;
054        }
055        
056    }