/*

* 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 "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.IO;

using System.Text;

using System.Threading;

using System.Collections;

using SymbianUtils.Tracer;

namespace SymbianUtils.TextUtilities.Readers.Types.Array

{

    public interface AsyncQueueObjectSupplier<TType>

    {

        #region AsyncQueueObjectSupplier interface declaration

        int QueueLength { get; }

        TType Dequeue();

        #endregion

    }

	public abstract class AsyncQueueReader<TType> : AsyncReaderBase

	{

		#region Construct & destruct

        public AsyncQueueReader( AsyncQueueObjectSupplier<TType> aObjectSupplier )

            : this( aObjectSupplier, null )

        {

        }

        public AsyncQueueReader( AsyncQueueObjectSupplier<TType> aObjectSupplier, ITracer aTracer )

            : base( aTracer )

		{

            iObjectSupplier = aObjectSupplier;

		}

		#endregion

        #region Abstract reading framework

        protected abstract void HandleObject( TType aObject, int aIndex, int aCount );

		#endregion

        #region From AsyncReaderBase

        protected override long Size

        {

            get

            {

                long size = 0;

                //

                lock( this )

                {

                    size = iObjectSupplier.QueueLength;

                }

                //

                return size;

            }

        }

        protected override long Position

        {

            get

            {

                long position = 0;

                //

                lock( this )

                {

                    position = iCurrentIndex;

                }

                //

                return position;

            }

        }

        #endregion

        #region Properties

        public int CurrentIndex

        {

            get

            {

                lock( this )

                {

                    return iCurrentIndex;

                }

            }

        }

        protected AsyncQueueObjectSupplier<TType> ObjectSupplier

        {

            get { return iObjectSupplier; }

        }

        #endregion

		#region Internal methods

		protected override void PerformOperation()

		{

            int count = 0;

            lock( this )

            {

                count = iObjectSupplier.QueueLength;

                iCurrentIndex = -1;

            }

            System.DateTime tenPercentTime = DateTime.Now;

            int newProgress = 0;

            int oldProgress = 0;

            while( CurrentIndex < count - 1 )

            {

                lock( this )

                {

                    ++iCurrentIndex;

                }

                //

                lock( this )

                {

                    TType obj = iObjectSupplier.Dequeue();

                    HandleObject( obj, iCurrentIndex-1, count );

                    newProgress = Progress;

                }

                //

                if	( newProgress != oldProgress )

                {

#if DEBUG

                    if ( newProgress > 0 && ( newProgress % 10 ) == 0 )

                    {

                        System.DateTime now = DateTime.Now;

                        long intermediateTickDuration = ( ( now.Ticks - tenPercentTime.Ticks ) / 100 );

                        System.Diagnostics.Debug.WriteLine( newProgress.ToString( "d2" ) + " % COMPLETE - " + intermediateTickDuration.ToString( "d12" ) );

                        tenPercentTime = now;

                    }

#endif

                    NotifyEvent( TEvent.EReadingProgress );

                    oldProgress = newProgress;

                }

            }

            System.DateTime endTime = DateTime.Now;

            long tickDuration = ( ( endTime.Ticks - iOperationStartTime.Ticks ) / 100 );

            System.Diagnostics.Debug.WriteLine( "QUEUE READ COMPLETE - " + tickDuration.ToString( "d12" ) );

        }

		#endregion

        #region Data members

        private int iCurrentIndex = -1;

        private readonly AsyncQueueObjectSupplier<TType> iObjectSupplier;

        #endregion

	}

}