// Copyright (c) 2006-2009 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:

// Node container implementation

//

#include <xml/utils/xmlengmem.h>

#include "xmlengownednodescontainer.h"

#include "xmlengdomdefs.h"

#include <stdapis/libxml2/libxml2_tree.h>

#include <stdapis/libxml2/libxml2_globals.h>

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

// Creates an instance of CXmlEngOwnedNodesContainer

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

//

CXmlEngOwnedNodesContainer* CXmlEngOwnedNodesContainer::NewL()

    {

    CXmlEngOwnedNodesContainer* obj = new (ELeave) CXmlEngOwnedNodesContainer();

    obj->iNodes = NULL;

    obj->iLast = NULL;

    obj->iCount = 0;

    return obj;

    }

CXmlEngOwnedNodesContainer::~CXmlEngOwnedNodesContainer()

    {

    }

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

// Searches for a node in the list

//

// @param   aNode Pointer to a libxml2 node

// @return Index in the list of nodes [0; iCount-1] or iCount if not found

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

//

TUint CXmlEngOwnedNodesContainer::Lookup(xmlNodePtr aNode)

    {

    TUint i = 0;

    xmlNodePtr tmp = iNodes;

    for(; tmp; tmp = tmp->next, i++)

        if(tmp == aNode)

            return i;

    return iCount;

    }

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

// Performs clean up of the list

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

//

void CXmlEngOwnedNodesContainer::RemoveAll()

    {

    iNodes = NULL;

    iCount = 0;

    }

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

// Performs clean up of all owned nodes:

// xmlFreeNode is called on every contained pointer

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

//

void CXmlEngOwnedNodesContainer::FreeAll()

    {

    xmlNodePtr tmp = iNodes;

    xmlNodePtr ptr;

    for(;tmp;)

        {

        ptr = tmp;

        tmp = tmp->next;

        if(ptr)

            xmlFreeNode(ptr);

        }

    iNodes = NULL;

    iCount = 0;

    }

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

// Adds an owned node.

//

// @param aNode  A pointer to some node to be added into the container

//

// @note This method does not check whether the pointer is already in the container

// @note In OOM situation the node is destroyed before leave occurs

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

//

void CXmlEngOwnedNodesContainer::Add(

    xmlNodePtr aNode )

    {

    if(iLast)

        {

        iLast->next = aNode;

        aNode->prev = iLast;        

        }

    else

        {

        iNodes = iLast = aNode;

        }

    iLast = aNode;

    ++iCount;

    }

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

// Excludes node pointer from the list of owned nodes.

// 

// does nothing if provided node pointer is not on the list.

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

//

void CXmlEngOwnedNodesContainer::Remove(

    xmlNodePtr aNode )

    {

    if(aNode == iLast)

        {

        iLast = aNode->prev;

        }

    else

        {

        aNode->next->prev = aNode->prev;    

        }

    if(aNode == iNodes)

        {

        iNodes = aNode->next;

        }

    else

        {

        aNode->prev->next = aNode->next;

        }    

    aNode->prev = NULL;

    aNode->next = NULL;

    --iCount;

    }