RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp > Class Template Reference

Implements a buffer that can be used with any kind of input stream. More...

#include <rw/stream/RWTInputStreamBufferImp.h>

Inherits FilteredInputStreamImp.

Public Types
typedef InputStream::element_type	element_type
typedef InputStream	RWInputStream_type

Public Member Functions
virtual	~RWTInputStreamBufferImp ()
virtual RWSize	available () const
virtual bool	isBad () const
virtual bool	isEof () const
virtual bool	isFail () const
virtual bool	isGood () const
virtual element_type	read ()
virtual RWSize	read (element_type *array, RWSize num)
virtual RWSize	readUntil (element_type *array, RWSize maxSize, element_type delim)
virtual RWSize	skip (RWSize numUnits)

Static Public Member Functions
static InputStream	make (const InputStream &sourceStream)
static InputStream	make (const InputStream &sourceStream, RWSize bufSize)
static InputStream	make (const InputStream &sourceStream, element_type *buffer, RWSize bufSize)

Protected Member Functions
	RWTInputStreamBufferImp (const InputStream &sourceStream)
	RWTInputStreamBufferImp (const InputStream &sourceStream, RWSize bufSize)
	RWTInputStreamBufferImp (const InputStream &sourceStream, element_type *buffer, RWSize bufSize)
element_type *	eback () const
element_type *	ebuf () const
element_type *	egptr () const
void	freeBuffer ()
void	gbump (RWSize n)
element_type *	gptr () const
void	setBufferEnd (element_type *gend_arg)
void	setg (element_type *gbeg_arg, element_type *gcur_arg, element_type *gend_arg)
bool	underflow ()

Detailed Description

template<class InputStream, class FilteredInputStreamImp>
class RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >

The class RWTInputStreamBufferImp implements a buffer that can be used with any kind of input stream. The size of the buffer is specified in its static member make() function, which is used to create it.

Member Typedef Documentation

template<class InputStream, class FilteredInputStreamImp>

typedef InputStream::element_type RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::element_type

A typedef for the type of element to be read from RWInputStream_type.

template<class InputStream, class FilteredInputStreamImp>

typedef InputStream RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::RWInputStream_type

A typedef for the template parameter InputStream which will be used as the source of elements.

Constructor & Destructor Documentation

template<class InputStream, class FilteredInputStreamImp>

virtual RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::~RWTInputStreamBufferImp ( )

virtual

Destructor.

template<class InputStream, class FilteredInputStreamImp>

RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::RWTInputStreamBufferImp ( const InputStream &  sourceStream )

protected

Initializes the reference to the input stream that will be used as the source of elements, as well as the internal buffer capacity, which will be equal to RW_STREAM_BUFFER_SIZE.

Parameters

sourceStream

The input stream that will serve as the source of elements.

template<class InputStream, class FilteredInputStreamImp>

RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::RWTInputStreamBufferImp ( const InputStream &  sourceStream, RWSize  bufSize  )

protected

Initializes the reference to the input stream that will be used as the source of elements, as well as the buffer capacity.

Parameters

sourceStream	The input stream that will serve as the source of elements.
bufSize	The buffer capacity in number of elements.

template<class InputStream, class FilteredInputStreamImp>

RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::RWTInputStreamBufferImp ( const InputStream &  sourceStream, element_type *  buffer, RWSize  bufSize  )

protected

Initializes the reference to the input stream that will be used as the source of elements, as well as the internal buffer.

Parameters

sourceStream	The input stream that will serve as the source of elements.
buffer	A pre-allocated buffer of size bufSize to be used internally by the constructed RWTInputStreamBufferImp object.
bufSize	The buffer capacity in number of elements.

Member Function Documentation

template<class InputStream, class FilteredInputStreamImp>

virtual RWSize RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::available ( ) const

virtual

Returns the number of elements that can be read from the stream without blocking. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

element_type* RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::eback ( ) const

inlineprotected

Returns a pointer to the buffer first element. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

element_type* RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::ebuf ( ) const

inlineprotected

Returns a pointer one position past the end of the buffer. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

element_type* RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::egptr ( ) const

inlineprotected

Returns a pointer one position past the input sequence last element. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

void RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::freeBuffer ( )

protected

Frees the memory associated with the internal buffer if necessary. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

void RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::gbump ( RWSize  n )

inlineprotected

Moves the current get pointer n positions forward. Throws no exceptions.

Parameters

n	The number of elements the current get pointer should be advanced.

template<class InputStream, class FilteredInputStreamImp>

element_type* RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::gptr ( ) const

inlineprotected

Returns a pointer to the input sequence current position. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

virtual bool RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::isBad ( ) const

virtual

If the stream is in bad state, then this function returns true, otherwise it returns false. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

virtual bool RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::isEof ( ) const

virtual

If no character can be obtained from the input sequence, this function returns true, otherwise it returns false. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

virtual bool RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::isFail ( ) const

virtual

If the stream is in fail state, then this function returns true, otherwise it returns false. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

virtual bool RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::isGood ( ) const

virtual

If the stream is in fail or bad state, then this function returns false, otherwise it returns true. Throws no exceptions.

template<class InputStream, class FilteredInputStreamImp>

static InputStream RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::make ( const InputStream &  sourceStream )

inlinestatic

Constructs an RWTInputStreamBufferImp instance that uses sourceStream as its source of elements, and returns a handle to it. The internal buffer is dynamically allocated to be of size RW_STREAM_BUFFER_SIZE.

Parameters

sourceStream

The input stream that will serve as the source of elements

template<class InputStream, class FilteredInputStreamImp>

static InputStream RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::make ( const InputStream &  sourceStream, RWSize  bufSize  )

inlinestatic

Constructs an RWTInputStreamBufferImp instance that uses sourceStream as its source of elements, and returns a handle to it. The internal buffer is dynamically allocated to be of size bufSize.

Parameters

sourceStream	The input stream that will serve as the source of elements.
bufSize	The buffer capacity in number of elements.

template<class InputStream, class FilteredInputStreamImp>

static InputStream RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::make ( const InputStream &  sourceStream, element_type *  buffer, RWSize  bufSize  )

inlinestatic

Constructs an RWTInputStreamBufferImp instance that uses sourceStream as its source of elements, and returns a handle to it. The internal buffer is initialized using the pre-allocated element's array of size bufSize.

Parameters

sourceStream	The input stream that will serve as the source of elements.
buffer	A pre-allocated buffer of size bufSize to be used internally by the constructed RWTInputStreamBufferImp object.
bufSize	The buffer capacity in number of elements.

template<class InputStream, class FilteredInputStreamImp>

virtual element_type RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::read ( )

virtual

Reads a single element.

template<class InputStream, class FilteredInputStreamImp>

virtual RWSize RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::read ( element_type *  array, RWSize  num  )

virtual

Reads an array of elements. The function returns the actual number of elements read.

Parameters

array	A pointer to the first element of the array. The array must have been pre-allocated to contain at least num elements.
num	The number of elements to be read from the stream.

template<class InputStream, class FilteredInputStreamImp>

virtual RWSize RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::readUntil ( element_type *  array, RWSize  maxSize, element_type  delim  )

virtual

Reads elements until the last element read is equal to delim, or maxSize elements have been read, or the end of the input sequence is reached. The elements read are stored in array. The function returns the actual number of elements read from the stream.

Parameters

array	A pointer to the array receiving the elements extracted from the stream.
maxSize	The maximum number of elements to be read.
delim	The element value used as a delimiter.

template<class InputStream, class FilteredInputStreamImp>

void RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::setBufferEnd ( element_type *  gend_arg )

inlineprotected

Sets the buffer's end pointer. Throws no exceptions.

Parameters

gend_arg

The value to be set in bufEnd_.

template<class InputStream, class FilteredInputStreamImp>

void RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::setg ( element_type *  gbeg_arg, element_type *  gcur_arg, element_type *  gend_arg  )

inlineprotected

Sets the buffer's pointers. Throws no exceptions.

Parameters

gbeg_arg	The value to be set in gbeg_.
gcur_arg	The value to be set in gnext_.
gend_arg	The value to be set in gend_.

template<class InputStream, class FilteredInputStreamImp>

virtual RWSize RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::skip ( RWSize  numUnits )

virtual

Skips numUnits elements from the input sequence if possible. The function returns the actual number of elements skipped, which can be any value between 0 and numUnits.

Parameters

numUnits

The number of elements to be skipped.

template<class InputStream, class FilteredInputStreamImp>

bool RWTInputStreamBufferImp< InputStream, FilteredInputStreamImp >::underflow ( )

protected

Fills up the buffer. Returns true if there are elements available, otherwise returns false. Throws no exceptions.