/*

* 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.Generic;

using SymbianUtils.Tracer;

namespace SymbianUtils.TextUtilities.Readers.Types.Array

{

	public abstract class AsyncEnumerableReader<TType> : AsyncReaderBase

	{

		#region Constructors

        protected AsyncEnumerableReader( ITracer aTracer )

            : base( aTracer )

        {

        }

        protected AsyncEnumerableReader( int aCount, IEnumerator<TType> aEnumerator )

            : this( aCount, aEnumerator, null )

        {

        }

        protected AsyncEnumerableReader( int aCount, IEnumerator<TType> aEnumerator, ITracer aTracer )

            : base( aTracer )

		{

            Setup( aCount, aEnumerator );

		}

		#endregion

        #region API

        protected void Setup( long aCount, IEnumerator<TType> aEnumerator )

        {

            iCount = aCount;

            iEnumerator = aEnumerator;

        }

        #endregion

        #region Abstract reading framework

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

		#endregion

        #region From AsyncReaderBase

        protected override long Size

        {

            get { return iCount; }

        }

        protected override long Position

        {

            get { return iCurrentIndex; }

        }

        #endregion

        #region Properties

        #endregion

		#region Internal methods

		protected override void PerformOperation()

		{

#if DEBUG

            System.DateTime tenPercentTime = DateTime.Now;

#endif

            iCurrentIndex = -1;

            int newProgress = 0;

            int oldProgress = 0;

            //

            bool hasEntry = iEnumerator.MoveNext();

            while ( hasEntry )

            {

                ++iCurrentIndex;

                TType entry = iEnumerator.Current;

                HandleObject( entry, iCurrentIndex, iCount );

                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;

                }

                // Move to next item

                hasEntry = iEnumerator.MoveNext();

            }

#if DEBUG

            System.DateTime endTime = DateTime.Now;

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

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

#endif

        }

		#endregion

        #region Data members

        private long iCount = 0;

        private IEnumerator<TType> iEnumerator = null;

        private long iCurrentIndex = -1;

        #endregion

	}

}