com.sparsity.sparksee.gdb.TextStream Class Reference

TextStream class. More...

Public Member Functions
int	Read (char[] dataOUT, int length)
	Read data from the stream.
bool	IsNull ()
	Returns TRUE if the stream is not available.
void	Write (char[] dataIN, int length)
	Write data to the stream.
	TextStream (bool append)
	Creates a new instance.
void	Close ()
	Closes the stream.

Detailed Description

TextStream class.

It allows for reading and writting Text attribute values.

It is very important to close the stream once no more reading or writting operations will be performed to ensure data is successfully stored.

Whereas string attributes are set and got using the Value class, text attributes are operated using a stream pattern.

Use of TextStream for writing: (i) Create a TextStream instance and (ii) set the stream for a text attribute of a node or edge instance with the graph SetAttributeText method. Once the set attribute text has been done, (iii) perform as many write operations as you need to the TextStream instance. Lastly, (iv) exeucte Close to flush and close the stream.

Use of TextStream for reading: (i) Get the stream of a text attribute of a node or edge instance with the GetAttributeText graph method. Once you have the TextStream instance, (ii) you can execute Read operations to read from the stream. (iii) The end of the stream is reached when Read returns 0. Finally, (iv) execute Close to close stream resources.

Check out the 'Attributes and values' section in the SPARKSEE User Manual for more details on this.

Author

Sparsity Technologies http://www.sparsity-technologies.com

Constructor & Destructor Documentation

com.sparsity.sparksee.gdb.TextStream.TextStream

(

bool

append

)

Creates a new instance.

A TextStream only can be created by the user to write data.

Parameters

append

[in] If TRUE, the it is created in append mode to write from the end of the stream, otherwise it is created to write from the begining of the stream.

Member Function Documentation

void com.sparsity.sparksee.gdb.TextStream.Close

(

)

Closes the stream.

Once the Stream is closed, it cannot be used again.

Closing the stream is mandatory when the stream is not null and strongly recommended when it's null to avoid deallocation problems in some platforms.

bool com.sparsity.sparksee.gdb.TextStream.IsNull

(

)

Returns TRUE if the stream is not available.

It returns for reading or writing data.

Returns

FALSE if the stream is ready

int com.sparsity.sparksee.gdb.TextStream.Read	(	char[]	dataOUT,
		int	length
	)

Read data from the stream.

Parameters

dataOUT	[out] Buffer to read data to. It must be allocated by the user.
length	[in] Length of the given data buffer. It must be > 0.

Returns

Amount of read data (<= length). If 0, there is no more data to be read from the stream.

void com.sparsity.sparksee.gdb.TextStream.Write	(	char[]	dataIN,
		int	length
	)

Write data to the stream.

Parameters

dataIN	[in] Buffer to write data from.
length	[in] Length of the data buffer. It must be > 0.