// Copyright (c) 2005-2009 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 set functions implementation

//

#include <stdapis/libxml2/libxml2_globals.h>

#include <stdapis/libxml2/libxml2_xpath.h>

#include <stdapis/libxml2/libxml2_xpathinternals.h>

#include <xml/dom/xmlengnodeset.h>

#include <xml/dom/xmlengnode.h>

#include "xmlengdomdefs.h"

#include <xml/utils/xmlengmem.h>

#define THIS_NODESET (static_cast<xmlNodeSetPtr>(iInternal))

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

// Default constructor

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

//

EXPORT_C RXmlEngNodeSet::RXmlEngNodeSet():iInternal(NULL)

    {

    }

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

// Frees any allocated resources for the RXmlEngNodeSet instance.

//

// @note All nodes referred to in a node set are "live",

//       meaning that they are not copies of actual nodes in

//       a document tree. <br>

//       <b> The only exception for this are namespace declarations, 

//       which ARE COPIES AND ARE DESTROYED with a node set</b>

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

//

EXPORT_C void RXmlEngNodeSet::Free()

    {

    // NOTE: namespace nodes are new objects (->next points to parent element)

    //       and should be destroyed; all other nodes are "live" and belong 

    //       to the document tree (so, should not be deleted)

    //       xmlXPathNodeSetFreeNs(xmlNsPtr ns) is used for namespaces

    if (!THIS_NODESET)

        return;  // nothing to free..

    xmlXPathFreeNodeSet(THIS_NODESET);

    iInternal = NULL;

    }

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

// @return Number of nodes in a node set

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

//

EXPORT_C TInt RXmlEngNodeSet::Length() const

    {

    return THIS_NODESET ? THIS_NODESET->nodeNr : 0;

    }

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

// Retrieves a node from node set by index

//

// @param aIndex  Node index  { 0 <= aIndex < Length() } 

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

//

EXPORT_C TXmlEngNode RXmlEngNodeSet::operator[](

    TInt aIndex) const

    {

    XE_ASSERT_DEBUG(THIS_NODESET && aIndex >= 0 && aIndex < THIS_NODESET->nodeNr);

    return TXmlEngNode(THIS_NODESET->nodeTab[aIndex]);

    }

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

// Checks whether aNode is in a resulting node set

//

// @return TRUE is node in the node set, FALSE otherwise

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

//

EXPORT_C TBool RXmlEngNodeSet::Contains(

    TXmlEngNode aNode) const

    {

    return xmlXPathNodeSetContains(THIS_NODESET, INTERNAL_NODEPTR(aNode));

    }

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

// Initializes a RXmlEngNodeSet instance as being "empty"

//

// This method is used when preparing node sets that will

// be used with RXmlEngXPathExpression::EvaluateWithDependenciesL(TXmlEngNode,RXmlEngNodeSet&)

// and TXmlEngXPathEvaluator::EvaluateWithDependenciesL(aExpression,aContextNode,aResolver,aDependents)

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

//

EXPORT_C void RXmlEngNodeSet::InitializeL()

    {

    Free();

    // create the libxml nodeset "object"

    iInternal = xmlXPathNodeSetCreate(NULL);

    OOM_IF_NULL(iInternal);

    }

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

// Constructor

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

//

RXmlEngNodeSet::RXmlEngNodeSet(void* aData):iInternal(aData)

    {

    }