// Copyright (c) 2008-2009 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:

// This class represents the database in the form of array

//

/**

 @file

 @internalTechnology

*/

#include <e32debug.h>

#include <cflog.h>

#include "dnsproxydb.h"

#include "dnsproxyengine.h"

#include "inet6log.h"

#include "dnsproxylog.h"

//

CDnsProxyDb* CDnsProxyDb::iDbObject= NULL;

CDnsProxyDb* CDnsProxyDb::CreateInstanceL(CDnsProxyEngine& aEngine)

/**

 * Creates the single object everytime

 * @return iDbObject- reference to CDnsProxyDb;

 *

 * @internalTechnology

 **/

	{

	if(!iDbObject)

		{

		iDbObject = new(ELeave)CDnsProxyDb(aEngine);

		}

	return iDbObject;

	}

CDnsProxyDb::CDnsProxyDb(CDnsProxyEngine& aEngine):iEngine(aEngine)

/**

 * Constructor

 *

 * @internalTechnology

 **/

	{

	}

CDnsProxyDb::~CDnsProxyDb()

/**

 * Destructor

 *

 * @internalTechnology

 **/

	{

	Cleanup();

	}

void CDnsProxyDb::UpdateDbL(const TDesC8& aHostName,TInetAddr& aHostAddr)

/**

 * Updates the DB with HostName and Host Address

 * @param aHostName - Host Name

 * @param aHostAddr - Host Address

 *

 * @internalTechnology

 **/

	{

	TDnsProxydbElement* aDbElement = new TDnsProxydbElement;

	aDbElement->iHostName.Copy(aHostName);

	aDbElement->iHostAddr = aHostAddr ;

	iElementList.AppendL(aDbElement);

	}

TDnsProxydbElement* CDnsProxyDb::GetRecordList(const TDesC8& aQName)

/**

 * Returns the array of TDnsProxydbElement object having same name as that of QueryName

 * @param  aName- Query Name to be searched in db

 * @return element - returns the reference to TDnsProxydbElement

 *

 * @internalTechnology

 **/

	{

	TBool flag = EFalse;

	TDnsProxydbElement* element = NULL;

	for(TInt i =0;i<iElementList.Count();i++)

		{

		 if(iElementList[i])

			{

			flag = CompareNames(iElementList[i]->iHostName,aQName);

			if(flag)

				{

				element = iElementList[i];

				break;

				}

			}

		}

	return element;	

	}

void CDnsProxyDb::AddRRecord(TDnsProxydbElement& aElementList,const TDesC8& aRRecord,TUint16 aDnsQType)

/**

 * Adds record into db

 * @param aElementList - associates with record to be inserted into db

 * @param aRRecord - record to be added into db which may be of type AN or NS

 * @param aFlag - which will indicate type of record like NS or AN

 * @internalTechnology

 **/

	{

	aElementList.iRecord.Copy(aRRecord);

	aElementList.iDnsQType = aDnsQType;

	}

void CDnsProxyDb::Cleanup()

/**

 * Destroys all the obejcts  present in the array list and empties it

 * @internalTechnology

 **/

	{

	iElementList.ResetAndDestroy();

	}

TDnsProxydbElement* CDnsProxyDb::FindIpAddress(TInetAddr& aAddr)

/**

 * Finds specified entry from db based on IP address

 * @param aAddr - TInetAddress

 * @return dbelement - pointer to TDnsProxydbElement class

 *

 * @internalTechnology

 **/

	{

	TDnsProxydbElement* dbelement = NULL;

	for(TInt i = 0;i < iElementList.Count();i++)

		{

		if(iElementList[i])

			{

			if(aAddr.Match(iElementList[i]->iHostAddr))

				{

				dbelement = iElementList[i];

				break;

				}

			}

		}

	return dbelement;	

	}

void CDnsProxyDb::DeleteDbEntry(TInetAddr& aAddr)

/**

 * Deletes specified entry from db based on IP address

 * @return TBool - returns ETrue if it is successful otherwise EFalse

 *

 * @internalTechnology

 **/

	{

	for(TInt i =0;i<iElementList.Count();i++)

		{

		if(iElementList[i])

			{

			TInetAddr ipaddr = iElementList[i]->iHostAddr;

			if(ipaddr.Match(aAddr))

				{

				delete iElementList[i];

				iElementList[i] = NULL;

				iElementList.Remove(i);

    			iElementList.Compress();

				}

			}

		}

	}

TBool CDnsProxyDb::CompareNames(const TDesC8& aHostName,const TDesC8& aQueryName)

/**

 * Compare Query Name with Host Name present in db

 * @param aHostName - Host name retrived from db

 * @param aQueryName - Query name to be compared with Host Name

 * @return TBool - ETrue if it sucessful otherwise EFalse

 *

 * @internalTechnology

 **/

	{

	TInt ret_val = aHostName.Compare(aQueryName);

	if(ret_val==0)

		return ETrue;

	return EFalse;

	}

TInt CDnsProxyDb::GetDbSize()

/**

 * Retunrs the current size of the db

 * @return size - current size of db

 *

 * @internalTechnology

 **/

	{

	return iElementList.Count();

	}