// Copyright (c) 1997-2009 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:

//

#include <s32mem.h>

#include <tzid.h>

#include "tzidinternal.h"

#include <tz.h>

/**

The maximum number of digits for a user-defined time zone (when it is 0x20000 -

1).

@internalComponent

*/

const TInt KMaxTzIdDigits = 6;

CTzId::CTzId()

	{

	}

CTzId::CTzId(TUint aNumericId) :

	iReferenceId(aNumericId)

	{

	}

/**

Time zone ID data externaliser.

@param aStream A stream that will contain the serialised time zone ID.

@internalComponent

*/

EXPORT_C void CTzId::ExternalizeL(RWriteStream& aStream) const

	{

	aStream << iReferenceId;

	TInt32 size	= 0;

	if (iZoneId)

		{

		size = iZoneId->Length();

		aStream << size;

		if (size)

			{

			aStream.WriteL(iZoneId->Des(), size);

			}

		}

	else

		{

		aStream << size;

		}

	}

/**

Serialised CTzId data internaliser.

@param aStream a stream containing the serialised time zone Id

@internalComponent

*/

EXPORT_C void CTzId::InternalizeL(RReadStream& aStream)

	{

	aStream >> iReferenceId;

	delete iZoneId;

	iZoneId = NULL;

	TInt32 size;

	aStream >> size;

	const TInt KMaxSize = KMaxTInt / 2;

	if (size < 0 || size >= KMaxSize)

	    {

	    User::Leave( KErrArgument );

	    }

    // Don't create the tz id if the size is 0 - it hasn't been set.

    if (size)

        {

    	iZoneId = HBufC8::NewL(size);

    	TPtr8 bufferPtr(iZoneId->Des() );

    	aStream.ReadL(bufferPtr, size);

        }

	}

/**

Destructor.

*/

EXPORT_C CTzId::~CTzId()

	{

	delete iZoneId;

	}

/**

Time zone ID factory method.

@param aStream a stream containing the serialised time zone Id

@leave KErrNoMemory or some other system error code

@return Pointer to CTzId; clients own the object.

@internalComponent

*/

EXPORT_C CTzId* CTzId::NewL(RReadStream& aStream)

	{

	CTzId* self = new(ELeave) CTzId();

	CleanupStack::PushL(self);

	self->InternalizeL(aStream);

	CleanupStack::Pop(self);

	return self;

	}

/**

Time zone ID factory method.

@param aNameIdentity A name recognised by the time zone database.

@return A pointer to the time zone ID. Clients take ownership.

*/

EXPORT_C CTzId* CTzId::NewL(const TDesC8& aNameIdentity)

	{

	CTzId* self = new(ELeave) CTzId();

	CleanupStack::PushL(self);

	self->iZoneId = aNameIdentity.AllocL();

	CleanupStack::Pop(self);

	return self;

	}

/**

Time zone ID factory method.

@param aNumericId A numeric reference ID, generated by the time zone compiler.

@return A pointer to the time zone ID. Clients take ownership.

@panic TzServer 8 aNumericId must not be zero.

*/

EXPORT_C CTzId* CTzId::NewL(TUint aNumericId)

	{

	const TUint KUnacceptableTzId = 0;

	// aNumericId must not be zero 

	__ASSERT_ALWAYS((aNumericId != KUnacceptableTzId), RTz::Panic(RTz::EPanicUnsupportedTimeZoneNoId));

	CTzId* self = new(ELeave) CTzId(aNumericId);

	CleanupStack::PushL(self);

	self->ConstructL();	

	CleanupStack::Pop(self);

	return self;

	}

void CTzId::ConstructL()

	{

	if (IsUserTzId())

		{

		TBuf8<KMaxTzIdDigits> name;

   		name.Num(iReferenceId); 

		SetIdL(name);

		}

	}

/**

Replicates a CTzId.

@return A pointer to CTzId; clients own the object.

@leave KErrNoMemory or some other system error code.

@internalComponent

*/

EXPORT_C CTzId* CTzId::CloneL() const

	{

	CTzId* clone = NULL;

	if (iZoneId)

		{

		clone = NewL(*iZoneId);

		clone->iReferenceId = iReferenceId;

		}

	else

		{

		clone = new(ELeave) CTzId(iReferenceId);

		}

	return clone;

	}

/**

Retrieves the time zone's name.

This can be used after calling RTz::GetTimeZoneIdL().

@return The time zone's name, if one has been set. A NULL descriptor if not.

*/

EXPORT_C const TDesC8& CTzId::TimeZoneNameID() const

	{

	if (NULL == iZoneId)

		{

		return KNullDesC8();

		}

	return *iZoneId;

	}

/**

Retrieves the time zone's numeric ID.

This can be used after calling RTz::GetTimeZoneIdL().

@return The time zone's numeric ID, generated by the time zone compiler.

*/

EXPORT_C TUint CTzId::TimeZoneNumericID() const

	{

	return iReferenceId;

	}

/**

Sets the numeric time zone ID.

@param aNumericId The new numeric ID, generated by the time zone compiler.

@internalComponent

*/

EXPORT_C  void CTzId::SetId(TUint aNumericId)

	{

	iReferenceId = aNumericId;

	}

/**

Sets the the time zone's name.

@param aNameIdentity string TZID as used in the Olson's TZ Database

@internalComponent

*/

EXPORT_C void CTzId::SetIdL(const TDesC8& aNameIdentity)

	{

	delete iZoneId;

	iZoneId = NULL;

	iZoneId = aNameIdentity.AllocL();

	}

/** 

Equality operator.

@param aTZId The ID of another time zone.

@return ETrue if the specified time zone ID is the same as this one, otherwise

EFalse.

*/

EXPORT_C TBool CTzId::operator==(const CTzId& aTZId) const

	{

	if ((aTZId.iReferenceId != 0) && (iReferenceId != 0))

		{

		return (aTZId.iReferenceId == iReferenceId);

		}

	else

		{

		if (iZoneId == NULL)

			{

			return EFalse;

			}

		if (aTZId.iZoneId == NULL)

			{

			return EFalse;

			}

		return (iZoneId->Compare(*(aTZId.iZoneId)) == 0);

		}

	}

/**

Determines if this time zone identifier has a numeric identifier value that

belongs to the range of values used to identify user-defined time zones.

@return Returns ETrue if this time zone identifier has a numeric identifier

value that belongs to the range of values used to identify user-defined time

zones and EFalse otherwise.

*/

EXPORT_C TBool CTzId::IsUserTzId() const

	{

	// Check if just the string identifier has been set.  If so, we will need

	// to attempt to extract a number from the string identifier and use this

	// as the numeric identifier.

	if (iReferenceId == 0 && iZoneId && *iZoneId != KNullDesC8)

		{

		TUint intId;

		TLex8 lex(*iZoneId );

		if(lex.Val(intId) == KErrNone)

			{

			CTzId* self = const_cast<CTzId*>(this);

			self->SetId(intId);

			}

		}

	return IsUserTzId(iReferenceId);

	}

/**

Determines if the given numeric time zone identifier value belongs to the range

of values used to identify user-defined time zones.

@param aTzId Numeric time zone identifier value.

@return Returns ETrue if the given numeric time zone identifier value belongs to

the range of values used to identify user-defined time zones and EFalse

otherwise.

*/

EXPORT_C TBool CTzId::IsUserTzId(TUint aTzId)

	{

	return (aTzId >= KUserTzIdMin && aTzId <= KUserTzIdMax);

	}