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/*
 * Copyright (c) 1996-2001
 * Logica Mobile Networks Limited
 * All rights reserved.
 *
 * This software is distributed under Logica Open Source License Version 1.0
 * ("Licence Agreement"). You shall use it and distribute only in accordance
 * with the terms of the License Agreement.
 *
 */
package org.smpp.smscsim;

import java.io.IOException;

import org.smpp.pdu.PDUException;
import org.smpp.pdu.Request;
import org.smpp.pdu.Response;

/**
 * PDUProcessor is abstract class which defines interface
 * functions for processing PDUs received by SMSCSession
 * from client as well as functions for the server side sending of PDU.
 * The actual implementation of the abstract functions of the class
 * defines the behaviour of the particular simulator.

 * The implementations of this class are ment to be generated by
 * descendant of PDUProcessorFactory class whenewer
 * new connection is accepted by SMSCListener.
 *
 * @author Logica Mobile Networks SMPP Open Source Team
 * @version $Revision: 1.2 $
 * @see PDUProcessorFactory
 * @see SMSCSession
 * @see SMSCListener
 */
public abstract class PDUProcessor {
	/**
	 * The group the processor belongs to. It's good for having overall control
	 * over specific group of processors, e.g. for those generated
	 * for particular listener.
	 */
	private PDUProcessorGroup group = null;

	/**
	 * If the processor is still processing, i.e. wasn't exited.
	 * @see #exit()
	 */
	private boolean active = true;

	/**
	 * Private variables initialsed to default values.
	 */
	public PDUProcessor() {
	}

	/**
	 * Initialises the processor with the given group.
	 * The group is basicaly intended to be a group of active
	 * processors.
	 * @param group the group this processor belongs to
	 */
	public PDUProcessor(PDUProcessorGroup group) {
		setGroup(group);
	}

	/**
	 * Meant to process requests received from client.
	 * @param request the request received from client
	 */
	public abstract void clientRequest(Request request);

	/**
	 * Meant to process responses received from client.
	 * @param response the response received from client
	 */
	public abstract void clientResponse(Response response);

	/**
	 * Meant to process requests sent on behalf of the server.
	 * This method is called by server and typically only sends the PDU
	 * to the client.
	 * @param request the request which has to be sent to client
	 */
	public abstract void serverRequest(Request request) throws IOException, PDUException;

	/**
	 * Meant to process responses sent on behalf of the server.
	 * This method is called by server and typically only sends the PDU
	 * to the client.
	 * @param response the response which has to be sent to client
	 */
	public abstract void serverResponse(Response response) throws IOException, PDUException;

	/**
	 * Stop the processor
	 */
	public abstract void stop();

	/**
	 * Sets the group which the pdu processor belongs to.
	 * Processor can belong to only one group.
	 * @param g the new group for the processor
	 */
	public void setGroup(PDUProcessorGroup g) {
		if (group != null) {
			group.remove(this);
		}
		group = g;
		if (group != null) {
			group.add(this);
		}
	}

	/**
	 * Returns the group of this pdu processor.
	 * @return the current group of the processor
	 * @see #setGroup(PDUProcessorGroup)
	 */
	public PDUProcessorGroup getGroup() {
		return group;
	}

	/**
	 * Returns if this pdu processor is still active.
	 * @return the activity status of the processor
	 * @see #exit()
	 */
	public boolean isActive() {
		return active;
	}

	/**
	 * Sets the processor to inactive state.
	 * Removes the processor from the group it belonged to.
	 * Called from SMSCSession.
	 * @see SMSCSession#run()
	 */
	public void exit() {
		if (group != null) {
			group.remove(this);
		}
		active = false;
		stop();
	}
}
/*
 * $Log: not supported by cvs2svn $
 * Revision 1.1  2003/07/23 00:28:39  sverkera
 * Imported
 *
 */