/*

* 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.Collections.Generic;

using System.Text;

namespace SymbianUtils.BasicTypes

{

    public class SymMask

    {

        #region Enumerations

        public enum TShiftDirection

        {

            ELeft = 0,

            ERight

        }

        #endregion

        #region Constructors

        public SymMask( string aBinary )

        {

            iMaskingBits = SymBitUtils.CreateMask( aBinary, out iExpectedValueAfterMasking );

        }

        public SymMask( string aBinary, TShiftDirection aDirection, uint aCount )

            : this( aBinary )

        {

            if ( aDirection == TShiftDirection.ELeft )

            {

                iShift = -Convert.ToInt32( aCount );

            }

            else

            {

                iShift = Convert.ToInt32( aCount );

            }

        }

        public SymMask( uint aMask )

            : this( aMask, aMask, TShiftDirection.ELeft, 0 )

        {

        }

        public SymMask( uint aMask, TShiftDirection aDirection, int aCount )

            : this( aMask, aMask, aDirection, aCount )

        {

        }

        public SymMask( uint aMask, uint aValue, TShiftDirection aDirection, int aCount )

        {

            iMaskingBits = aMask;

            iExpectedValueAfterMasking = aValue;

            if ( aDirection == TShiftDirection.ELeft )

            {

                iShift = -Convert.ToInt32( aCount );

            }

            else

            {

                iShift = Convert.ToInt32( aCount );

            }

        }

        #endregion

        #region API

        public bool IsMatch( uint aValue )

        {

            //      101 0 000000000000000000000000

            //      111 0 000000000000000000000000

            // 1110 010 1 100111110000000000111100

            bool ret = ( aValue & iMaskingBits ) == iExpectedValueAfterMasking;

            return ret;

        }

        public uint Apply( uint aValue )

        {

            uint ret = ( iMaskingBits & aValue );

            if ( iShift != 0 )

            {

                if ( iShift < 0 )

                {

                    ret <<= iShift;

                }

                else

                {

                    ret >>= iShift;

                }

            }

            return ret;

        }

        #endregion

        #region Properties

        #endregion

        #region Operators

        #endregion

        #region From System.Object

        #endregion

        #region Internal methods

        #endregion

        #region Data members

        private int iShift = 0;

        private uint iMaskingBits = 0;

        private uint iExpectedValueAfterMasking = 0;

        #endregion

    }

}