irlapstatendm.java

JRed is a 100％ Java implementation of the IrDA infrared communications protocols. JRed lets you beam

/*
**************************************************************************
** $Header: /cvsroot/jred/jred/src/com/synchrona/jred/irlap/IrLAPStateNDM.java,v 1.2 2000/07/30 20:18:12 mpatters Exp $
**
** Copyright (C) 2000 Synchrona, Inc. All rights reserved.
**
** This file is part of JRed, a 100% Java implementation of the IrDA
** infrared communications protocols.
**
** This file may be distributed under the terms of the Synchrona Public
** License as defined by Synchrona, Inc. and appearing in the file
** LICENSE included in the packaging of this file. The Synchrona Public
** License is based on the Q Public License as defined by Troll Tech AS
** of Norway; it differs only in its use of the courts of Florida, USA
** rather than those of Oslo, Norway.
**************************************************************************
*/
package com.synchrona.jred.irlap;

import com.synchrona.util.Utilities;

/**
 * Implement IrLAP's Normal Disconnected Mode.
 */
class IrLAPStateNDM extends IrLAPState {
	//--------------------------------------------------------------------
	// Implement Singleton pattern
	//--------------------------------------------------------------------

	private static IrLAPState s_instance = new IrLAPStateNDM();

	public static IrLAPState getInstance() {
		return s_instance;
	}

	private IrLAPStateNDM() {
		super();
	}

	//--------------------------------------------------------------------
	// (Re)Implementation of IrLAPState
	//--------------------------------------------------------------------

	public void connectionRequest(IrLAPContext context, int nDestination) throws Exception {
		if ( !context.isMediaBusy() ) {
			context.setMediaBusy(true);
			context.nextState(IrLAPStateSetup.getInstance());
			byte yConnection = context.generateConnectionAddress();
			context.sendSNRM(nDestination, yConnection);
			context.startFTimer();
			context.zeroRetryCount();
		}
	}

	/**
	 * Begin active discovery of other IrDA devices. Active discovery is
	 * not implemented in this version of J<font color="#ff0000">Red</font>.
	 */
	public void discoveryRequest(IrLAPContext context) throws Exception {
		logIfEnabled("discoveryRequest is not implemented yet.");
	}

	public void handleSNRM(IrLAPContext context, int nSource, int nDestination, byte yConnection, byte [] ayParameters) throws Exception {
		logIfEnabled("handleSNRM: " + Utilities.bytesToString(ayParameters, 0, ayParameters.length));
		context.setMediaBusy(true);
		context.nextState(IrLAPStateConnect.getInstance());
		context.waitMinimumTurnaroundTime();
		context.connectIndication(nSource, yConnection, ayParameters);
	}

	public void handleXID(IrLAPContext context, int nSource, int nDestination, byte ySlot, boolean bCommand, byte [] ayHints) throws Exception {
		if ( bCommand ) {
			context.generateResponseSlot((byte) 6, ySlot);
			if ( context.getResponseSlot() == ySlot ) {
				context.sendDiscoveryResponse(nSource);
				context.setFrameSent(true);
				context.startQueryTimer();
			}
			context.setMediaBusy(true);
			context.nextState(IrLAPStateReply.getInstance());
		}
	}

	//--------------------------------------------------------------------
	// End of implementation of IrLAPState
	//--------------------------------------------------------------------
}