rafmessageparser.java

RAFrame.基于SEP的资源管理器院码。

/*
 * Project: RAFrameRA Resource Adaptor Framework - An example Resource Adaptor
 *          for Mobicents - the open source JAIN SLEE implementation.
 *          See www.mobicents.org for more detailed information on Mobicents.
 *
 * File: RAFMessageParser.java
 * Author: Michael Maretzke
 * License: Distributable under LGPL license - see terms of license at gnu.org
 * Created: 3rd August 2005, 11:19
 * Version: 1.0
 */
package com.maretzke.raframe.message;

/**
 * The RAFMessageParser accepts strings and split them according to predefined rules
 * into separate elements and creates value objects of type Message.<br>
 * The RAFStack stack supports a simple message format / protocol. It contains
 * an id and a command. Normally, the message format looks like:<br>
 * id command<br>
 * e.g.<br>
 * 100 INIT<br>
 * <br>
 * The message format is embedded in a "protocol".<br>
 * The very first message in a "dialog" is the "100 INIT" command. It initiates
 * the "dialog". Here, the "dialog" for id 100 is initiated.<br>
 * The next message in a valid "dialog" is any number of "100 ANY" commands. They
 * continue the "dialog". Here, the "dialog" for id 100 is continued.<br>
 * The terminating message is the "100 END" command. It terminates the "dialog". 
 * Here the "dialog" for id 100 ends.<br>
 * The RAFMessageParser implements the simple message protocol above. 
 * 
 * @author Michael Maretzke
 */
public class RAFMessageParser implements MessageParser {
    
    public RAFMessageParser() {
    }
    
    public Message parse(String message) throws IncorrectRequestFormatException {
        // expecting something like this: 1234 command
        int space = message.indexOf(' ');
        if ((space == -1) || (space == message.length()))
            throw new IncorrectRequestFormatException("RequestParser.parse(): The request " + message + " does not follow the request rules.");
        String callID = message.substring(0, space);
        String command = message.substring(space+1);
        return new MessageFactoryImpl().createMessage(callID, command);
    }    
}