/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are met:

*

* - Redistributions of source code must retain the above copyright notice,

*   this list of conditions and the following disclaimer.

* - Redistributions in binary form must reproduce the above copyright notice,

*   this list of conditions and the following disclaimer in the documentation

*   and/or other materials provided with the distribution.

* - Neither the name of Nokia Corporation nor the names of its contributors

*   may be used to endorse or promote products derived from this software

*   without specific prior written permission.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

* POSSIBILITY OF SUCH DAMAGE.

* 

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

using System;

using System.Collections.Generic;

using System.Text;

using HeapLib.Statistics;

using HeapLib.Cells.Descriptors.Implementations.Unicode;

using HeapLib.Cells.Descriptors.Implementations.Ascii;

namespace HeapLib.Cells.Descriptors

{

    internal class DescriptorAlgorithmManager

    {

        #region API

        public static DescriptorInfo DescriptorInfo( HeapCell aCell, HeapStatistics aStats )

        {

            DescriptorInfo ret = null;

            //

            if ( iAlgorithms.Count == 0 )

            {

                PrepareAlgorithms( aStats );

            }

            //

            foreach ( DescriptorAlgorithmBase alg in iAlgorithms )

            {

                bool isDes = alg.IsDescriptor( aCell, out ret );

                if ( isDes && ret != null )

                {

                    // We won't allow any algorithm to "recognise" the heap cell as a descriptor

                    // unless it can say that the length is > 0.

                    int length = ret.Length;

                    if ( length > 0 )

                    {

                        break;

                    }

                    else

                    {

                        ret = null;

                    }

                }

            }

            return ret;

        }

        #endregion

        #region Internal methods

        private static void PrepareAlgorithms( HeapStatistics aStats )

        {

            // UNICODE

            iAlgorithms.Add( new DesUnicodeAlgorithmHBufC( aStats ) );

            iAlgorithms.Add( new DesUnicodeAlgorithmModifiableBuffers( aStats ) );

            // ASCII

            iAlgorithms.Add( new DesAsciiAlgorithmHBufC( aStats ) );

            iAlgorithms.Add( new DesAsciiAlgorithmModifiableBuffers( aStats ) );

            // C-STRING

            iAlgorithms.Add( new DesAsciiAlgorithmNullTerminatedString( aStats ) );

        }

        #endregion

        #region Data members

        private static List<DescriptorAlgorithmBase> iAlgorithms = new List<DescriptorAlgorithmBase>();

        #endregion

    }

}