/*
 *(c) Copyright QNX Software Systems Ltd. 2002.
 * All Rights Reserved.
 * 
 */

package org.eclipse.cdt.debug.internal.core;

import org.eclipse.cdt.debug.core.CDebugCorePlugin;
import org.eclipse.cdt.debug.core.cdi.CDIException;
import org.eclipse.cdt.debug.core.cdi.ICDISession;
import org.eclipse.cdt.debug.core.cdi.model.ICDITarget;
import org.eclipse.debug.core.DebugEvent;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IDebugEventSetListener;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.IDebugTarget;

/**
 * Default implementation of the session manager. 
 * Terminates session when the last target is terminated;   
 * 
 * @since Apr 28, 2003
 */
public class SessionManager implements IDebugEventSetListener
{
	public SessionManager()
	{
		DebugPlugin.getDefault().addDebugEventListener( this );
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	public Object getAdapter( Class adapter )
	{
		if ( SessionManager.class.equals( adapter ) )
			return this;
		return null;
	}

	public void dispose()
	{
		DebugPlugin.getDefault().removeDebugEventListener( this );
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.IDebugEventSetListener#handleDebugEvents(org.eclipse.debug.core.DebugEvent[])
	 */
	public void handleDebugEvents( DebugEvent[] events )
	{
		for ( int i = 0; i < events.length; i++ )
		{
			DebugEvent event = events[i];
			if ( event.getKind() == DebugEvent.TERMINATE )
			{
				Object element = event.getSource();
				if ( element instanceof IDebugTarget && ((IDebugTarget)element).getAdapter( ICDITarget.class ) != null )
				{
					handleTerminateEvent( ((IDebugTarget)element).getLaunch(), ((ICDITarget)((IDebugTarget)element).getAdapter( ICDITarget.class )).getSession() );
				}
			}
		}
	}

	private void handleTerminateEvent( ILaunch launch, ICDISession session )
	{
		IDebugTarget[] targets = launch.getDebugTargets();
		boolean terminate = true;
		for ( int i = 0; i < targets.length; ++i )
		{
			if ( targets[i].getAdapter( ICDITarget.class ) != null && 
				 session.equals( ((ICDITarget)targets[i].getAdapter( ICDITarget.class )).getSession() ) && 
				 !targets[i].isTerminated() && !targets[i].isDisconnected() )
				terminate = false;
		}		
		if ( terminate )
		{ 
			try
			{
				session.terminate();
			}
			catch( CDIException e )
			{
				CDebugCorePlugin.log( e );
			}
		}
	}
}