/*

* Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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: 

*

*/

using System;

using System.Collections;

using SymbianTree;

namespace SymBuildParsingLib.Parser.Framework.Document

{

	public abstract class SymParserDocument : SymDocument

	{

		#region Constructors & destructor

		public SymParserDocument( SymParserDocumentContext aContext )

		{

			aContext.Document = this;

			iContextStack.Push( aContext );

		}

		#endregion

		#region API

		public void PushContext( SymParserDocumentContext aContext )

		{

			iContextStack.Push( aContext );

		}

		public SymParserDocumentContext PopContext()

		{

			SymParserDocumentContext top = (SymParserDocumentContext) iContextStack.Peek();

			return PopContext( top );

		}

		public SymParserDocumentContext PopContext( SymParserDocumentContext aExpected )

		{

			// Can't pop off the last context

			System.Diagnostics.Debug.Assert( iContextStack.Count > 1 );

			SymParserDocumentContext top = (SymParserDocumentContext) iContextStack.Peek();

			//

			if	( aExpected.Equals( aExpected ) == false )

			{

				throw new ArgumentException( "Cannot pop context - expectations not met during pop operation" );

			}

			//

			iContextStack.Pop();

			return top;

		}

		#endregion

		#region Properties

		public SymParserDocumentContext Context

		{

			get

			{

				System.Diagnostics.Debug.Assert( iContextStack.Count > 0 );

				SymParserDocumentContext ret = (SymParserDocumentContext) iContextStack.Peek();

				return ret;

			}

		}

		#endregion

		#region Data members

		private Stack iContextStack = new Stack();

		#endregion

	}

}