// Copyright (c) 2004-2009 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 "TzLocalizationResourceReader.h"	//CTzLocalizationResourceReader

#include "TzLocalizationDataTypes.h"		//CTzLocalizedCity etc

#include "TzLocalizer.h"					//TTzLocalizerPanics

#include <bautils.h>						//BaflUtils::NearestLanguageFile

// Resource File locations

_LIT(KTzLocalizationTimeZoneResourceFileName,"\\Resource\\TimeZoneLocalization\\timezones.rSC");

_LIT(KTzLocalizationGroupResourceFileName,"\\Resource\\TimeZoneLocalization\\timezonegroups.rSC");

_LIT(KFlashPath,"c:\\Resource\\TimeZoneLocalization\\");

_LIT(KFlashDrive, "c:");

_LIT(KRom, "z:");

/**

Allocates and constructs a new CTzLocalizationResourceReader object

@return the newly constructed CTzLocalizationResourceReader

@internalTechnology

*/

CTzLocalizationResourceReader* CTzLocalizationResourceReader::NewL()

	{

	CTzLocalizationResourceReader* self = CTzLocalizationResourceReader::NewLC();

	CleanupStack::Pop(self);

	return self;

	}

/**

Allocates and constructs a new CTzLocalizationResourceReader object

The pointer to the new object is left on the cleanup stack

@return the newly constructed CTzLocalizationResourceReader

@internalTechnology

*/

CTzLocalizationResourceReader* CTzLocalizationResourceReader::NewLC()

	{

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

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

/**

Second phase contructor

@internalTechnology

*/

void CTzLocalizationResourceReader::ConstructL()

	{

	User::LeaveIfError(iFs.Connect());

	// Assign Panic category, in case it's needed

	_LIT(KTzLocalizationCategory,"TZLOCALIZATION");

	// If resource files are found on flash drive,

	// these will be used exclusively otherwise the 

	// default ones on ROM will be used.	

	CDir* dirList;

	// Get a list of files on flash drive

	TInt ret = iFs.GetDir(KFlashPath, KEntryAttMaskSupported, ESortNone, dirList);

	CleanupStack::PushL(dirList);

	TFileName* timeZoneResourceFileName = new(ELeave) TFileName;

	CleanupStack::PushL(timeZoneResourceFileName);

	TFileName* groupResourceFileName = new(ELeave) TFileName;

	CleanupStack::PushL(groupResourceFileName);

	TInt count = 0;

	if(dirList != NULL)

		{

		count = dirList->Count();		

		}

	// Use the files on ROM

	if(ret == KErrPathNotFound || count == 0)

		{

		timeZoneResourceFileName->Format(KRom);

		timeZoneResourceFileName->Append(KTzLocalizationTimeZoneResourceFileName);

		groupResourceFileName->Format(KRom);

		groupResourceFileName->Append(KTzLocalizationGroupResourceFileName);		

		}

	// Use the files on system drive

	else if(ret == KErrNone)

		{		

		if(count > 0)

			{

			timeZoneResourceFileName->Format(KFlashDrive);

			timeZoneResourceFileName->Append(KTzLocalizationTimeZoneResourceFileName);

			groupResourceFileName->Format(KFlashDrive);

			groupResourceFileName->Append(KTzLocalizationGroupResourceFileName);

			}

		}

	else

		{

		User::Leave(ret);

		}

	// Form the time zone resource filename using BaflUtils::NearestLanguageFile

	BaflUtils::NearestLanguageFile(iFs,*timeZoneResourceFileName);

	// Form the time zone group resource filename using BaflUtils::NearestLanguageFile

	BaflUtils::NearestLanguageFile(iFs,*groupResourceFileName);

	// Open resource files - this can be done now, as it is opened in EFileShareReadersOnly mode		

	TRAPD(timeZoneResErr,iTimeZoneResourceFile.OpenL(iFs,*timeZoneResourceFileName));

	if(timeZoneResErr == KErrNotFound || timeZoneResErr == KErrPathNotFound)

		{

		User::Panic(KTzLocalizationCategory,CTzLocalizer::ETzLocalizerPanicResourceFileNotFound);

		}

	User::LeaveIfError(timeZoneResErr);		

	iTimeZoneResourceFile.ConfirmSignatureL();

	TRAPD(groupResErr,iGroupResourceFile.OpenL(iFs,*groupResourceFileName));

	// Set iGroupResourceFileExists to so that it can be checked before 

	// iGroupResourceFile is used

	iGroupResourceFileExists = (groupResErr == KErrNone);

	if(iGroupResourceFileExists)

		{

		iGroupResourceFile.ConfirmSignatureL();

		iGroupResourceFileExists = ETrue;

		}

	CleanupStack::PopAndDestroy(3, dirList); // groupResourceFileName, timeZoneResourceFileName, dirList

	}

/**

Destructor

@internalTechnology

*/

CTzLocalizationResourceReader::~CTzLocalizationResourceReader()

	{

	iTimeZoneResourceFile.Close();

	if(iGroupResourceFileExists)

		{

		iGroupResourceFile.Close();

		}

	delete iResourceBuffer;

	iFs.Close();

	}

/**

Searches the time zone resource file for the given time zone ID. This function will

leave if the specified ID is not found.

@param aTimeZoneId time zone to search for.

@return The resource ID or KErrNotFound.

@internalTechnology

*/

TInt CTzLocalizationResourceReader::FindTimeZoneResourceIdL(const TInt aTimeZoneId)

	{

	TInt initialOffset = FirstTimeZoneResourceIdL();

	TInt idToCheck;

	// Search through all resources

	TInt i = 0;

	while(iTimeZoneResourceFile.OwnsResourceIdL(initialOffset + i))

		{

		// Read current resource contents

		BufferResourceL(iTimeZoneResourceFile,initialOffset + i);

		// get the first int16 (WORD in resource STRUCT)

		idToCheck = iResourceReader.ReadInt16();

		// get rid of the buffer, it's no longer needed

		ResetResourceBuffer();

		// perform check

		if(idToCheck == aTimeZoneId)

			{

			// return the current resource ID

			return initialOffset + i;

			}

		++i;

		}

	// If it's got to here the aId hasn't been found, so leave

	User::Leave(KErrNotFound);

	return KErrNotFound;	// To satisfy compiler

	}

/**

Returns the resource Id of the specified resource. This

leaves if this resource is not found in the resource file.

@param aResourceFile The resource file that the offset belongs to.

@param aOffset The offset to return.

@return The resource Id of the first resource containing localised data.

@internalTechnology

*/

TInt CTzLocalizationResourceReader::LocalizedResourceIdL(const RResourceFile& aResourceFile, const TTzResourceOffset aOffset)

	{

	TInt resourceIdToReturn = aResourceFile.Offset();

	// Skip on the relevant number of resources, using the Offset enum

	resourceIdToReturn += aOffset;

	if(!aResourceFile.OwnsResourceIdL(resourceIdToReturn))

		{

		User::Leave(KErrNotFound);

		}

	return resourceIdToReturn;

	}

/**

Returns the resource Id of the first time zone resource. This

leaves if this resource is not found in the resource file.

@return The resource Id of the first time zone resource.

@internalTechnology

*/

TInt CTzLocalizationResourceReader::FirstTimeZoneResourceIdL()

	{

	return LocalizedResourceIdL(iTimeZoneResourceFile,ETzFirstTimeZoneResource);

	}

/**

Returns the resource Id of the first group resource. This

leaves if this resource is not found in the resource file.

This should only be called if iGroupResourceFile != NULL

@return The resource Id of the first group resource.

@internalTechnology

*/

TInt CTzLocalizationResourceReader::FirstGroupResourceIdL()

	{

	return LocalizedResourceIdL(iGroupResourceFile,ETzFirstLocalizedResource);

	}

/**

Returns the resource Id of the resource containing the default cached zone

information. This leaves if this resource is not found in the resource file.

@return The resource Id of the resource containing the default cached zone

information.

@internalTechnology

*/

TInt CTzLocalizationResourceReader::CachedTimeZoneResourceIdL()

	{

	return LocalizedResourceIdL(iTimeZoneResourceFile,ETzFirstLocalizedResource);

	}

/**

Fills iResourceBuffer with the resource specified by aResourceId and sets up

iResourceReader to read from this resource. This should always be followed by a

call to ResetResourceBuffer.  This function will leave if the requested resource

is not found in the specified resource file.

@param aResourceFile The resourcefile to read from.

@param aResourceId The resource to read from.

@internalTechnology

*/

void CTzLocalizationResourceReader::BufferResourceL(const RResourceFile& aResourceFile, const TInt aResourceId)

	{

	if(!aResourceFile.OwnsResourceIdL(aResourceId))

		{

		User::Leave(KErrNotFound);

		}

	// Assign buffer for holding resource

	iResourceBuffer = aResourceFile.AllocReadL(aResourceId);

	// TResourceReader for getting data out of the buffer

	iResourceReader.SetBuffer(iResourceBuffer);

	}

/**

Resets the iResourceBuffer that contains the binary data of a resource.

@internalTechnology

*/

void CTzLocalizationResourceReader::ResetResourceBuffer()

	{

	delete iResourceBuffer;

	iResourceBuffer = NULL;

	}

/**

From MTzLocalizationReader

Reads the specified time zone from the resource file.

@param aTimeZoneId The ID of the time zone to return

@return The specfied localized time zone object.

@leave KErrNotFound Leaves if the requested Time Zone is not found.

@internalTechnology

*/

CTzLocalizedTimeZone* CTzLocalizationResourceReader::ReadTimeZoneL(const TInt aTimeZoneId)

	{

	TInt resourceId = FindTimeZoneResourceIdL(aTimeZoneId);

	return DoReadTimeZoneL(resourceId);

	}

/**

From MTzLocalizationReader

Reads the time zone specified in aTzLocalizedId time

zone from the resource file. If the resource ID is invalid, the time zone is

read using the time zone ID.

@param aTzLocalizedId The TTzLocalizedId specifying the resource ID and Time

zone Id of the Time zone to return.

@return The specfied localized time zone object.

@leave KErrNotFound Leaves if the requested Time Zone is not found.

@internalTechnology

*/

CTzLocalizedTimeZone* CTzLocalizationResourceReader::ReadTimeZoneL(const TTzLocalizedId& aTzLocalizedId)

	{

	CTzLocalizedTimeZone* timeZoneToReturn;

	// Check if the resource is in the time zone resource file

	if(iTimeZoneResourceFile.OwnsResourceIdL(aTzLocalizedId.ResourceId()))

		{

		timeZoneToReturn = DoReadTimeZoneL(aTzLocalizedId.ResourceId());

		}

	// If the resource ID of aTzLocalizedId isn't found in the reource file,

	// attempt to search for the timezone using the timezone id.

	else

		{

		timeZoneToReturn = ReadTimeZoneL(aTzLocalizedId.TimeZoneId());

		}

	return timeZoneToReturn;

	}

/**

From MTzLocalizationReader

Reads all time zones from the resource file and appends them to the supplied array.

@param aTimeZones An array that at the end of this function contains all time zones.

@leave KErrNotFound Leaves if the no time zones are found in the resource file.

@internalTechnology

*/

void CTzLocalizationResourceReader::ReadAllTimeZonesL(CTzLocalizedTimeZoneArray& aTimeZones)

	{

	TInt initialOffset = FirstTimeZoneResourceIdL();

	// Variables for us in loop

	CTzLocalizedTimeZone* timeZone;

	// Search through all resources

	TInt i = 0;

	while(iTimeZoneResourceFile.OwnsResourceIdL(initialOffset + i))

		{

		// Read new time zone

		timeZone = DoReadTimeZoneL(initialOffset + i);

		CleanupStack::PushL(timeZone);

		// Add new time zone to the array (ownership is transferred into array)

		aTimeZones.AppendL(timeZone);

		CleanupStack::Pop(timeZone);

		timeZone = NULL;

		++i;

		}

	// If no owned resources were found - Leave

	if(i == 0)

		{

		User::Leave(KErrNotFound);

		}

	}

/**

Reads in and returns a localized time zone found at the specified resource id.

@param aResourceId The resource ID of the time zone in the time zone resource

file

@return The localized time zone found at the specified resource ID.

@internalTechnology

*/

CTzLocalizedTimeZone* CTzLocalizationResourceReader::DoReadTimeZoneL(const TInt aResourceId)

	{

	BufferResourceL(iTimeZoneResourceFile,aResourceId);

	CTzLocalizedTimeZone* timeZone = CreateTimeZoneFromResourceL(aResourceId);

	ResetResourceBuffer();

	return timeZone;

	}

/**

This does the actual reading of a localized time zone from the resource file.

The iResourceReader MUST already have been set up with a call to

BufferResourceL(iTimeZoneResourceFile,...), BEFORE this function is called.

@return A CTzLocalizedTimeZone containing the localized time zone information

that is currently found in iResourceReader.

@internalTechnology

*/

CTzLocalizedTimeZone* CTzLocalizationResourceReader::CreateTimeZoneFromResourceL(const TInt aResourceId)

	{

	// Read localized time zone data form the resource file in the correct order

	TInt16 timeZoneId = (TInt16)iResourceReader.ReadInt16();

	TPtrC standardName(iResourceReader.ReadTPtrC());

	TPtrC daylightName(iResourceReader.ReadTPtrC());

	TPtrC shortStandardName(iResourceReader.ReadTPtrC());

	TPtrC shortDaylightName(iResourceReader.ReadTPtrC());

	TTzLocalizedId tzlocalId(timeZoneId,aResourceId);

	CTzLocalizedTimeZone* timeZone = CTzLocalizedTimeZone::NewL

		(

		tzlocalId,

		standardName,

		daylightName,

		shortStandardName,

		shortDaylightName

		);

	return timeZone;

	}

/**

From MTzLocalizationReader Reads all cities from the resource file and appends

them to the supplied array.

@param aCities An array that at the end of this function will contain all

cities contained in the resource file.

@leave KErrNotFound Leaves if no cities are found.

@internalTechnology

*/

void CTzLocalizationResourceReader::ReadCitiesL(CTzLocalizedCityArray& aCities)

	{

	TInt initialOffset = FirstTimeZoneResourceIdL();

	// Search through all resources

	TInt i = 0;

	while(iTimeZoneResourceFile.OwnsResourceIdL(initialOffset + i))

		{

		// Read new city into the city array

		DoReadCitiesL(aCities, initialOffset + i);

		++i;

		}

	// If no owned resources were found - Leave

	if(i == 0)

		{

		User::Leave(KErrNotFound);

		}

	}

/**

From MTzLocalizationReader Read the cities that are in the specified time zone

into the specified city array.

@param aCities An array of cities that will contain the cities from the

specified time zone.

@param aTimeZoneId The ID of the time zone containing the cities to return,.

@leave KErrNotFound Leaves if the specified time zone is not found or it

contains no cities.

@internalTechnology

*/

void CTzLocalizationResourceReader::ReadCitiesL(CTzLocalizedCityArray& aCities, const TInt aTimeZoneId)

	{

	TInt resourceId = FindTimeZoneResourceIdL(aTimeZoneId);

	DoReadCitiesL(aCities, resourceId);

	}

/**

From MTzLocalizationReader Read the cities that are in the specified time zone

into the specifed city array. If the resource ID is invalid, the correct

resource ID is found in the resource file.

@param An array of cities that will contain the cities from the specified time

zone.

@param aTzLocalizedId The TTzLocalizedId specifying of the time zone ID and

resource ID of the time zone containing the cities to return,.

@leave KErrNotFound Leaves if the specified time zone is not found or it

contains no cities.

@internalTechnology

*/

void CTzLocalizationResourceReader::ReadCitiesL(CTzLocalizedCityArray& aCities, const TTzLocalizedId& aTzLocalizedId)

	{

	// Check if the resource is in the time zone resource file

	if(iTimeZoneResourceFile.OwnsResourceIdL(aTzLocalizedId.ResourceId()))

		{

		DoReadCitiesL(aCities, aTzLocalizedId.ResourceId());

		}

	// search for aTzLocalizedId's timezone ID instead

	else

		{

		ReadCitiesL(aCities, aTzLocalizedId.TimeZoneId());

		}

	}

/**

Reads in and adds the array of cities contained in the specified resource ID to

the supplied city array

@param The array of cities to which the the cities found in the time zone at

the specified resource ID will be appended to.

@param aResourceId The resource ID of the time zone that contains the cities to

be read.

@internalTechnology

*/

void CTzLocalizationResourceReader::DoReadCitiesL(CTzLocalizedCityArray& aCities, const TInt aResourceId)

	{

	BufferResourceL(iTimeZoneResourceFile,aResourceId);

	AddCityArrayFromResourceL(aCities,aResourceId);

	ResetResourceBuffer();

	}

/**

This does the actual reading of the localized cities from the resource file.

The iResourceReader MUST already have been set up with a call to

BufferResourceL(iTimeZoneResourceFile,...) BEFORE this function is called.

@param aCities The array of cities to add the resource cities to.

@param aResourceId The resource ID of the time zone containing the cities to

read.

@return An array of CTzLocalizedCity objects containing the cities that are

currently found in iResourceReader.

@internalTechnology

*/

void CTzLocalizationResourceReader::AddCityArrayFromResourceL(CTzLocalizedCityArray& aCities, const TInt aResourceId)

	{

	// Eat up the localised time zone info from the resource

	CTzLocalizedTimeZone* timeZone = CreateTimeZoneFromResourceL(aResourceId);

	// Create a TTZlocalizedId to give to all the cities

	TTzLocalizedId tzLocalizedId(timeZone->TimeZoneId(),aResourceId);

	// Delete timeZone as it is no longer needed

	delete timeZone;

	timeZone = NULL;

	// Get the number of cities (which automatically precedes the array as a WORD in the STRUCT)