/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
*
*/
package com.nokia.carbide.internal.cpp.epoc.engine.model;

import com.nokia.carbide.internal.api.cpp.epoc.engine.dom.IASTNode;
import com.nokia.carbide.internal.api.cpp.epoc.engine.dom.ITranslationUnitListener;
import com.nokia.cpp.internal.api.utils.core.*;

/**
 * Listen to unauthorized external changes to the TU
 */
class TranslationUnitListener implements ITranslationUnitListener {
	private boolean changesAllowed;
	public void allowChanges(boolean allowed) {
		Check.checkState(allowed != changesAllowed);
		changesAllowed = allowed;
	}
	/* (non-Javadoc)
	 * @see com.nokia.carbide.internal.api.cpp.epoc.engine.dom.ITranslationUnitListener#changedNode(com.nokia.carbide.internal.api.cpp.epoc.engine.dom.IASTNode)
	 */
	public void changedNode(IASTNode node) {
		if (!changesAllowed)
			throw new IllegalStateException("illegal change to translation unit outside model or view"); //$NON-NLS-1$
	}
	
}