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/*
* Copyright (c) 2008, 2009, 2011, 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.security;
import org.eclipse.net4j.util.fsm.FiniteStateMachine;
import java.nio.ByteBuffer;
/**
* @author Eike Stepper
*/
public abstract class Negotiator<STATE extends Enum<?>, EVENT extends Enum<?>>
extends FiniteStateMachine<STATE, EVENT, INegotiationContext>implements INegotiator, INegotiationContext.Receiver
{
private transient STATE initialState;
private transient STATE successState;
private transient STATE failureState;
private transient EVENT startEvent;
private transient EVENT bufferEvent;
private boolean initiator;
public Negotiator(Class<STATE> stateEnum, Class<EVENT> eventEnum, STATE initialState, STATE successState,
STATE failureState, EVENT startEvent, EVENT bufferEvent, boolean initiator)
{
super(stateEnum, eventEnum);
if (initialState == null)
{
throw new IllegalStateException("initialState == null"); //$NON-NLS-1$
}
if (successState == null)
{
throw new IllegalStateException("successState == null"); //$NON-NLS-1$
}
if (failureState == null)
{
throw new IllegalStateException("failureState == null"); //$NON-NLS-1$
}
if (startEvent == null)
{
throw new IllegalStateException("startEvent == null"); //$NON-NLS-1$
}
if (bufferEvent == null)
{
throw new IllegalStateException("bufferEvent == null"); //$NON-NLS-1$
}
this.initialState = initialState;
this.successState = successState;
this.failureState = failureState;
this.startEvent = startEvent;
this.bufferEvent = bufferEvent;
this.initiator = initiator;
}
public STATE getInitialState()
{
return initialState;
}
public STATE getSuccessState()
{
return successState;
}
public STATE getFailureState()
{
return failureState;
}
public EVENT getBufferEvent()
{
return bufferEvent;
}
public EVENT getStartEvent()
{
return startEvent;
}
public boolean isInitiator()
{
return initiator;
}
public void negotiate(INegotiationContext context)
{
context.setReceiver(this);
context.setState(initialState);
if (initiator)
{
process(context, startEvent, null);
postProcess(context);
}
}
public void receiveBuffer(INegotiationContext context, ByteBuffer buffer)
{
process(context, bufferEvent, buffer);
postProcess(context);
}
protected void postProcess(INegotiationContext context)
{
Enum<?> state = context.getState();
if (state == successState)
{
handleSuccess(context);
}
else if (state == failureState)
{
handleFailure(context);
}
}
/**
* @since 2.0
*/
protected void handleSuccess(INegotiationContext context)
{
context.setFinished(true);
}
/**
* @since 2.0
*/
protected void handleFailure(INegotiationContext context)
{
context.setFinished(false);
}
}
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