/*
* 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
    }
}