IlvMessageDatabase Class Reference

Message handling class. More...

#include <ilviews/base/message.h>

Public Member Functions
virtual void	clean ()
	Cleans the message database. More...
const char *	getMessage (const char *msgid, const IlSymbol *language) const
	Gets a message. More...
void	putMessage (const char *msgid, IlSymbol *language, const char *value, IlBoolean copy=IlTrue)
	Adds a message. More...
virtual IlBoolean	read (std::istream &istr, const IlvDisplay *display=0, const char *context=0)
	Reads a message database from the input stream. More...
IlBoolean	read (const char *filename, const IlvDisplay *display=0, const char *fName=0)
	Reads a message database from a file. More...
virtual void	remove (IlSymbol *language)
	Removes all messages for a language. More...
virtual IlBoolean	removeMessage (const char *msgid)
	Removes a message. More...
virtual void	write (std::ostream &ostr, const IlSymbol *language=0, IlEncoding encoding=IlNoEncoding) const
	Writes the message database to the output stream. More...
void	write (const char *filename, const IlSymbol *language=0, IlEncoding encoding=IlNoEncoding) const
	Writes the message database to a file. More...

Detailed Description

Message handling class.

Library: xviews or winviews or mviews (mutually exclusive)

Rogue Wave Views provides a simple mechanism to help you localize applications. The IlvMessageDatabase class allows to associate several translations strings with single message identifier (one translation per language), and provides a way to retrieve the right translation at runtime, based on the current language.

Each instance of the IlvDisplay class creates its own message database. It reads the database description from the file name provided in the environment variable ILVDB, or views.dbm if this variable is not set. This file is searched for in the display path. You can access this database by calling the member function IlvDisplay::getDatabase(). Each string that you plan to show in different languages can be stored in the database with its different possible translations. We say that you associate a message identifier with different message strings, depending on the language you target. The language is specified in a symbol.

See also

IlvDisplay

IlvDisplay::getDatabase()

IlvDisplay::getMessage()

IlvGetMessage().

Member Function Documentation

clean()

virtual void IlvMessageDatabase::clean ( )

virtual

Cleans the message database.

Empties the database. Every message is deleted from every language.

getMessage()

const char* IlvMessageDatabase::getMessage	(	const char *	msgid,
		const IlSymbol *	language
	)		const

Gets a message.

Retrieves the message string associated with the message identifier msgid for the language language. This string should not be modified or deleted by the user.

Parameters

msgid	The message identifier of the message to be retrieved.
language	The language.

Returns

The message string.

putMessage()

void IlvMessageDatabase::putMessage	(	const char *	msgid,
		IlSymbol *	language,
		const char *	value,
		IlBoolean	copy = IlTrue
	)

Adds a message.

Associates the message string value with the message identifier msgid for the language language. A copy of value is performed if copy is omitted or set to IlTrue. Any previous definition is discarded.

Parameters

msgid	The message identifier.
language	The language.
value	The message string.
copy	A Boolean value to copy rather than move the string.

read() [1/2]

virtual IlBoolean IlvMessageDatabase::read ( std::istream &  istr, const IlvDisplay *  display = 0, const char *  context = 0  )

virtual

Reads a message database from the input stream.

Reads the description of a database from the input stream istr and appends this description to the current database.

Parameters

istr	The input stream.
display	A display instance, used for reporting errors.
context	A string that, in the case there is an error, will be used in the generated error message to provide some context to the end user.

Returns

IlFalse if there has been an error loading the message database.

read() [2/2]

IlBoolean IlvMessageDatabase::read	(	const char *	filename,
		const IlvDisplay *	display = 0,
		const char *	fName = 0
	)

Reads a message database from a file.

Reads this database from the file filename. If the display parameter is not 0, the file is searched for in the display path, provided that filename is a relative path name. If you are using the internationalization feature, you should be aware that it will be impossible to read a message database located in a locale directory if the display argument is not provided.

Parameters

filename	The input file.
display	The display instance providing the search path to search for a relative filename.
fName	Undocumented parameter.

Returns

IlFalse if an error occurred while loading the message database.

remove()

virtual void IlvMessageDatabase::remove ( IlSymbol *  language )

virtual

Removes all messages for a language.

Removes the definition of every message for the language language.

Parameters

language

The language whose messages are to be removed.

removeMessage()

virtual IlBoolean IlvMessageDatabase::removeMessage ( const char *  msgid )

virtual

Removes a message.

Removes every definition of the message identifier msgid.

Parameters

msgid

The message identifier to be removed.

Returns

IlFalse if no such message identifier was found in the database.

write() [1/2]

virtual void IlvMessageDatabase::write ( std::ostream &  ostr, const IlSymbol *  language = 0, IlEncoding  encoding = IlNoEncoding  ) const

virtual

Writes the message database to the output stream.

Parameters

ostr	The output stream.
language	The language that is serialized.
encoding	The encoding to be used for serialization.

write() [2/2]

void IlvMessageDatabase::write	(	const char *	filename,
		const IlSymbol *	language = 0,
		IlEncoding	encoding = IlNoEncoding
	)		const

Writes the message database to a file.

Saves this database to the file filename.

Parameters

filename	The output file.
language	The language that is serialized.
encoding	The encoding to be used for serialization.