StreamHandler Class Reference

Provides a central class to register globally used output streams. Currently supported streams are. More...

#include <OpenMS/CONCEPT/StreamHandler.h>

Collaboration diagram for StreamHandler:

Public Types
enum	StreamType { FILE , STRING }
	Defines the type of the stream that should be handled. More...

Public Member Functions
	StreamHandler ()
	Default constructor. More...
virtual	~StreamHandler ()
	destructor More...
Int	registerStream (StreamType const type, const String &stream_name)
	Creates a stream of type type and with name stream_name. More...
void	unregisterStream (StreamType const type, const String &stream_name)
	De-registers a stream of type type and with name stream_name from the handler. More...
std::ostream &	getStream (StreamType const type, const String &stream_name)
	Returns a reference to the stream of type type and with name stream_name. More...
bool	hasStream (const StreamType type, const String &stream_name)
	Returns true if the stream stream_name with type type is registered. More...

Protected Member Functions
std::ostream *	createStream_ (const StreamType type, const String &stream_name)
	Creates a stream with the given type and the given name. More...

Protected Attributes
std::map< String, std::ostream * >	name_to_stream_map_
	Maps all registered stream names to the corresponding std::ostream. More...
std::map< String, StreamType >	name_to_type_map_
	Maps all registered stream names to the corresponding StreamHandler::StreamType. More...
std::map< String, Size >	name_to_counter_map_
	Maps all registered stream names to the number of times it was registered. If the counter goes to zero, the stream will be closed and removed. More...

Private Member Functions
	StreamHandler (const StreamHandler &source)
	copy constructor More...
virtual StreamHandler &	operator= (const StreamHandler &source)
	assignment operator More...

Friends
std::ostream &	operator<< (std::ostream &os, StreamHandler const &stream_handler)
	Overload for the insertion operator (operator<<) to have a formatted output of the StreamHandler. More...

Detailed Description

Provides a central class to register globally used output streams. Currently supported streams are.

• std::ofstream
• std::ostringstream

You can simply request a stream from StreamHandler and it will manage the process of construction and destruction (if the stream is not needed any more).

A normal scenario would be

STREAM_HANDLER.registerStream(StreamHandler::FILE, "name_of_the_output_file");
STREAM_HANDLER.getStream(StreamHandler::FILE, "name_of_the_output_file") << "This will be send to the file" << std::endl;
// ...

// you do not need the file any more
STREAM_HANDLER.unregisterStream(StreamHandler::FILE, "name_of_the_output_file");
// StreamHandler will close the file stream if no other part of your program requested the same stream

Member Enumeration Documentation

StreamType

enum StreamType

Defines the type of the stream that should be handled.

Enumerator
FILE
STRING

Constructor & Destructor Documentation

StreamHandler() [1/2]

StreamHandler

(

)

Default constructor.

~StreamHandler()

virtual ~StreamHandler ( )

virtual

destructor

StreamHandler() [2/2]

StreamHandler ( const StreamHandler &  source )

private

copy constructor

Member Function Documentation

createStream_()

std::ostream* createStream_ ( const StreamType  type, const String &  stream_name  )

protected

Creates a stream with the given type and the given name.

Parameters

type	Type of the stream (e.g. FILE)
stream_name	Name of the stream (e.g. the file name for a file stream).

Returns

A pointer to the created stream.

getStream()

std::ostream& getStream	(	StreamType const	type,
		const String &	stream_name
	)

Returns a reference to the stream of type type and with name stream_name.

If the stream was not registered before an ElementNotFoundException will be thrown.

Parameters

type	Type of the stream (e.g. FILE)
stream_name	Name of the stream (e.g. the file name for a file stream).

Exceptions

ElementNotFoundException

Returns

A reference to the requested stream.

hasStream()

bool hasStream	(	const StreamType	type,
		const String &	stream_name
	)

Returns true if the stream stream_name with type type is registered.

Parameters

type	Type of the stream (e.g. FILE)
stream_name	Name of the stream (e.g. the file name for a file stream).

Returns

bool indication if the stream is known.

operator=()

virtual StreamHandler& operator= ( const StreamHandler &  source )

privatevirtual

assignment operator

registerStream()

Int registerStream	(	StreamType const	type,
		const String &	stream_name
	)

Creates a stream of type type and with name stream_name.

If the stream is already registered the reference counter is increased.

Note

The stream name must be unique. You cannot register the same stream name with two different types.

Parameters

type	Type of the stream (e.g. FILE)
stream_name	Name of the stream (e.g. the file name for a file stream).

Returns

An integer indicating if the operation was completed successfully (value != 1 means a failure occurred).

unregisterStream()

void unregisterStream	(	StreamType const	type,
		const String &	stream_name
	)

De-registers a stream of type type and with name stream_name from the handler.

It also decreases the reference counter for the named stream. If the counter reaches 0. The stream will be closed.

Parameters

type	Type of the stream (e.g. FILE)
stream_name	Name of the stream (e.g. the file name for a file stream).

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  os, StreamHandler const &  stream_handler  )

friend

Overload for the insertion operator (operator<<) to have a formatted output of the StreamHandler.

Member Data Documentation

name_to_counter_map_

std::map<String, Size> name_to_counter_map_

protected

Maps all registered stream names to the number of times it was registered. If the counter goes to zero, the stream will be closed and removed.

name_to_stream_map_

std::map<String, std::ostream *> name_to_stream_map_

protected

Maps all registered stream names to the corresponding std::ostream.

name_to_type_map_

std::map<String, StreamType> name_to_type_map_

protected

Maps all registered stream names to the corresponding StreamHandler::StreamType.