/*

* Copyright (c) 2006 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:  Implementation of array of variable size elements on global chunk

*

*/

#include <mpxlog.h>

#include "mpxdataarray.h"

#include "mpxheapmanager.h"

#include "mpxdata.h"

#define ITEM(x,y) RMPXHeapManager::Ptr<RMPXDataItem>(x,y)

#define OFFSET(x,y) RMPXHeapManager::Offset(x,y)

// -----------------------------------------------------------------------------

// RMPXDataItem::Reset

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Reset(TUint aClientHandle)

    {

    MPX_ASSERT(aClientHandle);

    if (iBufLen)

        {

        // If the buffer contains a media/media array, then we need

        // to release its reference (could end up being recursive)

        //

        TAny* data=Buf(aClientHandle);

        MMPXData* d=MMPXData::Data(aClientHandle,data,iBufLen);

        if(d)

            {

            d->Release(aClientHandle);

            }

        // Now free the actual buffer

        iUid=0;

        iBufLen=0;

        }

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Copy

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Copy(TUint aClientHandle,TAny* aSrc,TInt aSize)

    {

    //The source could be zero-length descriptor: aSize is 0 and aSrc is NULL

    //ASSERT if aSrc is NULL while aSize is not zero, invalid descriptor

    MPX_ASSERT(((aSrc!=NULL)?ETrue:(aSize==0))&&aClientHandle);

    //

    Reset(aClientHandle);

    RMPXHeapManager& m=RMPXHeapManager::HeapManager(aClientHandle);

    //Set uid for this item

    iUid=m.IncrementCounter();

    if (aSize) // Could be zero sized, e.g. zero-length descriptor

        {

        (void)Mem::Copy((TAny*)((TUint8*)this+iBufOffset),aSrc,aSize);

        iBufLen=aSize;

        //

        // Need to increment ref count if adding a 'sleeping' media/media array object

        //

        TAny* data=Buf(aClientHandle);

        MMPXData* d=MMPXData::Data(aClientHandle,data,iBufLen);

        if(d)

            {

            d->AddRef(aClientHandle);

            }

        }

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Data

// -----------------------------------------------------------------------------

//

TAny* RMPXDataItem::Buf(TUint aClientHandle)

    {

    ASSERT(aClientHandle);

    return iBufLen?(TAny*)((TUint8*)this+iBufOffset):NULL;

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Insert

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Insert(

    TUint aClientHandle,

    RMPXDataItem* aPrevious,

    RMPXDataItem* aNext)

    {

    MPX_ASSERT(aClientHandle);

    //

    iPreviousOffset=aPrevious?OFFSET(aClientHandle,aPrevious):0;

    iNextOffset=aNext?OFFSET(aClientHandle,aNext):0;

    TInt thisOffset=OFFSET(aClientHandle,this);

    if (aPrevious)

        {

        aPrevious->iNextOffset=thisOffset;

        }

    if (aNext)

        {

        aNext->iPreviousOffset=thisOffset;

        }

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Insert

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Insert(

    TUint aClientHandle,

    TInt aPreviousOffset,

    TInt aNextOffset)

    {

    MPX_ASSERT(aClientHandle);

    iPreviousOffset=aPreviousOffset;

    iNextOffset=aNextOffset;

    TInt thisOffset=OFFSET(aClientHandle,this);

    if (aPreviousOffset)

        {

        RMPXDataItem* previous=ITEM(aClientHandle,aPreviousOffset);

        previous->iNextOffset=thisOffset;

        }

    if (aNextOffset)

        {

        RMPXDataItem* next=ITEM(aClientHandle,aNextOffset);

        next->iPreviousOffset=thisOffset;

        }

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Set

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Set(TUint aClientHandle,RMPXDataItem* aOldItem)

    {

    MPX_ASSERT(aOldItem&&aClientHandle);

    //

    iPreviousOffset=aOldItem->iPreviousOffset;

    iNextOffset=aOldItem->iNextOffset;

    TInt thisOffset=OFFSET(aClientHandle,this);

    if (iPreviousOffset)

        {

        RMPXDataItem* previous=ITEM(aClientHandle,iPreviousOffset);

        previous->iNextOffset=thisOffset;

        }

    if (iNextOffset)

        {

        RMPXDataItem* next=ITEM(aClientHandle,iNextOffset);

        next->iPreviousOffset=thisOffset;

        }

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Set

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Set(TUint aClientHandle,TInt aOldItemOffset)

    {

    RMPXDataItem* oldItem=ITEM(aClientHandle,aOldItemOffset);

    Set(aClientHandle,oldItem);

    }

// -----------------------------------------------------------------------------

// RMPXDataItem::Remove

// -----------------------------------------------------------------------------

//

void RMPXDataItem::Remove(TUint aClientHandle)

    {

    MPX_ASSERT(aClientHandle);

    if (iPreviousOffset)

        {

        RMPXDataItem* previous=ITEM(aClientHandle,iPreviousOffset);

        previous->iNextOffset=iNextOffset;

        }

    if (iNextOffset)

        {

        RMPXDataItem* next=ITEM(aClientHandle,iNextOffset);

        next->iPreviousOffset=iPreviousOffset;

        }

    iPreviousOffset=0;

    iNextOffset=0;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::RMPXDataItemArray

// -----------------------------------------------------------------------------

//

RMPXDataItemArray::RMPXDataItemArray()

    : iFirstItemOffset(0),iLastItemOffset(0),iNumItems(0),iPos(0),iIndex(0)

    {

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Close

// -----------------------------------------------------------------------------

//    

void RMPXDataItemArray::Close(TUint aClientHandle)

    { 

    MPX_ASSERT(aClientHandle); 

    Reset(aClientHandle);

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::DataItem

// -----------------------------------------------------------------------------

//

RMPXDataItem* RMPXDataItemArray::DataItem(TUint aClientHandle,TInt aIndex)

    {

    MPX_ASSERT(aClientHandle&&aIndex>=0&&aIndex<iNumItems);

    //

    RMPXDataItem* dataItem=NULL;

    while(!dataItem)

        {

        //

        // Start looking from the current position: this is an optimisation

        // since the client is likely to either iterate from this position,

        // or make another query from this item. iPos and iIndex MUST 

        // correspond

        //

        RMPXDataItem* item=ITEM(aClientHandle,iPos);

        if (iIndex==aIndex)

            {

            dataItem=item;

            }

        else if (iIndex>aIndex)

            {

            iIndex--;

            iPos=item->PreviousOffset();

            }

        else // if (iIndex<aIndex)

            {

            iIndex++;

            iPos=item->NextOffset();

            }

        }

    MPX_ASSERT(dataItem && (TInt)dataItem > (TInt)&RMPXHeapManager::HeapManager(aClientHandle));

    return dataItem;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Delete

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Delete(TUint aClientHandle,RMPXDataItem* aItem)

    {

    MPX_ASSERT(aClientHandle&&aItem);

    aItem->Close(aClientHandle);  // Release objects in the buffer

    TInt r=RMPXHeapManager::HeapManager(aClientHandle).Free(aClientHandle,aItem);

    MPX_ASSERT(r==KErrNone);

    (void)r;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Append

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Append(TUint aClientHandle,RMPXDataItem& aItem)

    {

    MPX_ASSERT(aClientHandle);

    //

    aItem.Insert(aClientHandle,iLastItemOffset,0);

    iLastItemOffset=OFFSET(aClientHandle,&aItem);

    if (iNumItems++==0)

        {

        iFirstItemOffset=iLastItemOffset;

        }

    iPos=iFirstItemOffset;

    iIndex=0;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Set

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Set(TUint aClientHandle,RMPXDataItem& aItem,TInt aIndex)

    {

    MPX_ASSERT(aClientHandle&&aIndex>=0&&aIndex<iNumItems);

    //

    RMPXDataItem* oldItem=DataItem(aClientHandle,aIndex);

    aItem.Set(aClientHandle,oldItem);

    TInt oldItemOffset=OFFSET(aClientHandle,oldItem); 

    TInt itemOffset=OFFSET(aClientHandle,&aItem); 

    if (oldItemOffset==iLastItemOffset) 

        {

        iLastItemOffset=itemOffset;

        }

     if (oldItemOffset==iFirstItemOffset) 

        {

        iFirstItemOffset=itemOffset;

        } 

    Delete(aClientHandle,oldItem);

    iPos=iFirstItemOffset;

    iIndex=0;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Insert

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Insert(TUint aClientHandle,RMPXDataItem& aItem,TInt aIndex)

    {

    MPX_ASSERT(aClientHandle&&aIndex>=0&&aIndex<iNumItems);

    //

    RMPXDataItem* itemBefore=aIndex==0?NULL:DataItem(aClientHandle,aIndex-1);

    RMPXDataItem* itemAfter=aIndex<iNumItems?DataItem(aClientHandle,aIndex):NULL;

    aItem.Insert(aClientHandle,itemBefore,itemAfter);

    TInt itemOffset=OFFSET(aClientHandle,&aItem);

    if (!itemAfter) // this is the last one

        {

        iLastItemOffset=itemOffset;

        }

    if (!itemBefore||iNumItems==0)  // this is the first or the only one

        {

        iFirstItemOffset=itemOffset;

        } 

    iPos=iFirstItemOffset;

    iIndex=0;

    ++iNumItems;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Remove

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Remove(TUint aClientHandle,TInt aIndex)

    {

    MPX_ASSERT(aClientHandle&&aIndex>=0&&aIndex<iNumItems);

    //

    RMPXDataItem* item=DataItem(aClientHandle,aIndex);

    TInt itemOffset=OFFSET(aClientHandle,item);

    if (iFirstItemOffset==itemOffset)

        {

        iFirstItemOffset=item->NextOffset();

        }

    if (iLastItemOffset==itemOffset)

        {

        iLastItemOffset=item->PreviousOffset();

        }   

    item->Remove(aClientHandle);

    Delete(aClientHandle,item);

    iPos=iFirstItemOffset; 

    iIndex=0; 

    --iNumItems;

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Reset

// -----------------------------------------------------------------------------

//

void RMPXDataItemArray::Reset(TUint aClientHandle)

    {

    if (iFirstItemOffset)

        {

        RMPXDataItem* item=ITEM(aClientHandle,iFirstItemOffset);

        while(item)

            {

            Delete(aClientHandle,item);

            item=item->NextOffset()?ITEM(aClientHandle,item->NextOffset()):NULL;

            }

        }

    // Reset members

    iFirstItemOffset=0;

    iLastItemOffset=0;

    iNumItems=0;

    iPos=0;

    iIndex=0; 

    }

// -----------------------------------------------------------------------------

// RMPXDataItemArray::Find

// -----------------------------------------------------------------------------

//

TInt RMPXDataItemArray::Find(TUint aClientHandle,const RMPXDataItem& aItem)

    {

    TInt r=KErrNotFound;

    if (iFirstItemOffset)

        {

        TInt index=KErrNotFound;

        RMPXDataItem* item=ITEM(aClientHandle,iFirstItemOffset);

        while(item)

            {  

            index++;

            TUint8* d1 = reinterpret_cast<TUint8*>(item->Buf(aClientHandle));

            TUint8* d2 = 

             reinterpret_cast<TUint8*>(const_cast<RMPXDataItem*>(&aItem)->

                                                            Buf(aClientHandle));

            if (Mem::Compare(d1, item->Size(), d2, aItem.Size()) == 0)

                {

                r=index;

                break;

                }

            item=item->NextOffset()?ITEM(aClientHandle,item->NextOffset()):NULL;

            }

        }  

    return r;

    }

// End of file