chatcommand.java

MINA自带的一些小例子

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 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.mina.example.chat;

/**
 * Encapsulates a chat command. Use {@link #valueOf(String)} to create an
 * instance given a command string.
 * 
 * @author The Apache Directory Project ([e-mail])
 * @version $Rev$, $Date$
 */
public class ChatCommand {
    public static final int LOGIN = 0;

    public static final int QUIT = 1;

    public static final int BROADCAST = 2;

    private final int num;

    private ChatCommand(int num) {
        this.num = num;
    }

    public int toInt() {
        return num;
    }

    public static ChatCommand valueOf(String s) {
        s = s.toUpperCase();
        if ("LOGIN".equals(s)) {
            return new ChatCommand(LOGIN);
        }
        if ("QUIT".equals(s)) {
            return new ChatCommand(QUIT);
        }
        if ("BROADCAST".equals(s)) {
            return new ChatCommand(BROADCAST);
        }

        throw new IllegalArgumentException("Unrecognized command: " + s);
    }
}