// 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:

//

#ifndef __LANGUTILIMPL_H__

#define __LANGUTILIMPL_H__

#include <f32file.h>

#include <e32std.h>

/**

Specifies the maximum length of the numerical part of the suffix.

If this is changed the documentation of the following functions 

must also be updated:

	LangUtil::NearestLanguageFile()

	TNearestLanguageFileFinder::CountDigitsFromEndInValidSuffix()

	TNearestLanguageFileFinder::SetFileName()

*/

const TInt KMaxSuffixLength = 5;

class RDirectoryScanner

/**

@internalAll

*/

    {

public:

    virtual TInt Open(RFs& aFs, const TDesC& aMatchPattern) = 0;

    virtual TInt Next(TEntry& aOut) = 0;

    virtual void Close() = 0;

    virtual ~RDirectoryScanner() {}

    };

NONSHARABLE_CLASS(RRealDirectoryScanner) : public RDirectoryScanner

/**

@internalAll

*/

    {

public:

    virtual TInt Open(RFs& aFs, const TDesC& aMatchPattern);

    virtual TInt Next(TEntry& aOut);

    virtual void Close();

private:

    RDir iDir;

    };

/**

 * Add a language to the end of the language path, unless it is already

 * present. On entry, the language path must have an ELangNone entry at its

 * end. This will be true on exit also.

 * @internalAll

 */

void AddLanguage(TLanguagePath& aPath, TLanguage aNewLanguage);

/**

 * Create a language path from the current language, ideal language and locale. 

 * The path may have up to eight entries in it.

 * @internalAll

 */

void MakeLanguageDowngradePath(TLanguagePath& aPath,

	TLanguage aCurrent, TLanguage aIdeal, const TLocale& aLocale);

/**

 * This class contains all the functions for working out the nearest language

 * file. It can be derived from for test code purposes.

 * @internalAll

 */

NONSHARABLE_CLASS(TNearestLanguageFileFinder)

	{

public:

	TNearestLanguageFileFinder(const RFs& aFs);

	TBool SetFileName(TFileName& aFileName);

	TLanguage Language();

	// put back the original suffix and drive letter

	void RepairFileName();

	// add the preset custom resource drive, if any, to iDrives.

	TInt AddCustomResourceDrive();

	// add all remaining drives to iDrives. iDrives must not have more than one

	// drive in it on entry.

	void AddAllDrives();

	// Tries to append the language code to iFileName. This is 00..09 or just the number.

	// If there was not enough space, EFalse is returned.

	TBool AppendLanguageCode(TLanguage aLanguage);

	// Search the drives in iDrives for the file named iFileName.

	// iFileName must have a drive specifier, which will be overwritten.

	TBool FindDrive();

	// Search for files across all drives in all languages in the path plus the

	// language-neutral file.

	// On entry, iFileName should be the original name with a drive specifier

	// minus the suffix. On return, iFileName will be untouched if EFalse is

	// returned, but contain the result if ETrue is returned.

	TBool FindLanguageAndDrive();

	// Test whether the filename passed in matches the stem given + numbers

	// added to the end. Returns the number if it does, or KErrNotFound if not.

	// aFileName must not end in a digit.

	static TInt LanguageNumberFromFile(const TDesC& aFileName, const TDesC& aStem);

	// Find lowest numbered file that matches iFileName, which must be without

	// its suffix.

	TInt FindFirstLanguageFile(RFs&);

	// Try each drive for any language files that match iFileName.

	// iFileName must have a directory specifier and be without its suffix.

	// returns KErrNotFound, KErrNone or error code.

	TInt FindFirstLanguageFileAndDrive();

	virtual TInt GetCustomResourceDriveNumber() const;

	virtual TInt FileExists(const TDesC& aFileName) const;

	// return our member that is our directory scanning class

	virtual RDirectoryScanner& DirectoryScanner();

	virtual ~TNearestLanguageFileFinder() {}

private:

	TInt CountDigitsFromEnd(const TDesC& aFilename);

	TInt CountDigitsFromEndInSuffix (const TDesC& aFilename);

public:

	const RFs& iFs;

	TFileName* iFileName;

	TLanguage  iLanguage;

	TBuf<26> iDrives;

	TLanguagePath iPath;

	TBuf<KMaxSuffixLength> iSuffix;

	TInt iInitialDriveLetter;

	// length minus the removed suffix

	TInt iOriginalBaseLength;

	// length plus added drive letter minus removed suffix

	TInt iBaseLength;

	RRealDirectoryScanner iDirScanner;

	};

#endif // __LANGUTILIMPL_H__