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Core::IOBuffer

Core::IOBuffer Class Reference

#include <IOBuffer.h>

Inheritance diagram for Core::IOBuffer:

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Collaboration diagram for Core::IOBuffer:

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List of all members.

Public Member Functions

 IOBuffer (IOAccessor *accessor)
virtual String * className (void) const
 Answer receiver class name.
virtual ByteArray * buffer (void)
virtual void bufferChanged (void)
virtual long currentBufferPosition (void)
virtual long firstDataPosition (void)
virtual long lastDataPosition (void)
virtual long lastWriteablePosition (void)
virtual bool isSeekable (void)
virtual ByteArray * readPositionAndSetOffset (long position, long &offset)
virtual ByteArray * nextAndSetOffset (long &offset)
virtual void commit (void)
virtual void flushBufferUpTo (long position)
virtual long readBufferStartingAt (long position)
virtual void stepToNextBuffer (void)

Protected Attributes

IOAccessor * io_accessor
ByteArray * _buffer
long buffer_amount

Constructor & Destructor Documentation

IOBuffer::IOBuffer (  IOAccessor *  accessor  ) 
 

Definition at line 31 of file IOBuffer.cc.

References _buffer, buffer_amount, Core::IOAccessor::bufferSize(), and io_accessor.

00032 {
00033     io_accessor = accessor;
00034     _buffer = new ByteArray(io_accessor->bufferSize());
00035     buffer_amount = 0;
00036 }

Member Function Documentation

ByteArray * IOBuffer::buffer (  void   )  [virtual]
 

Definition at line 45 of file IOBuffer.cc.

References _buffer.

Referenced by Core::ExternalStream::ExternalStream(), and Core::ExternalWriteStream::flush().

00046 {
00047     return _buffer;
00048 }

void IOBuffer::bufferChanged (  void   )  [virtual]
 

Definition at line 51 of file IOBuffer.cc.

Referenced by Core::ExternalWriteStream::flush().

00052 {
00053     /* Does nothing */
00054 }

String * IOBuffer::className (  void   )  const [virtual]
 

Answer receiver class name.

Because there isn't any standard way to obtain class name this method comes to place.

Every class should rewrite this method but many didn't (yet).

Reimplemented from Core::Object.

Definition at line 39 of file IOBuffer.cc.

00040 {
00041     return new String("IOBuffer");
00042 }

void IOBuffer::commit (  void   )  [virtual]
 

Definition at line 105 of file IOBuffer.cc.

References Core::IOAccessor::commit(), and io_accessor.

Referenced by Core::ExternalStream::commit().

00106 {
00107     io_accessor->commit();
00108 }

long IOBuffer::currentBufferPosition (  void   )  [virtual]
 

Definition at line 57 of file IOBuffer.cc.

Referenced by Core::ExternalStream::readPosition().

00058 {
00059     return 0;
00060 }

long IOBuffer::firstDataPosition (  void   )  [virtual]
 

Definition at line 62 of file IOBuffer.cc.

Referenced by Core::ExternalStream::ExternalStream(), and Core::ExternalWriteStream::flush().

00063 {
00064     return 0;
00065 }

void IOBuffer::flushBufferUpTo (  long  position  )  [virtual]
 

Definition at line 111 of file IOBuffer.cc.

References _buffer, io_accessor, and Core::IOAccessor::writeForSureFrom().

Referenced by Core::ExternalWriteStream::flush().

00112 {
00113     if (position > 0)
00114         io_accessor->writeForSureFrom(_buffer, 0, position);
00115 }

bool IOBuffer::isSeekable (  void   )  [virtual]
 

Definition at line 78 of file IOBuffer.cc.

References io_accessor, and Core::IOAccessor::isSeekable().

Referenced by Core::ExternalReadStream::skip().

00079 {
00080     return io_accessor->isSeekable();
00081 }

long IOBuffer::lastDataPosition (  void   )  [virtual]
 

Definition at line 67 of file IOBuffer.cc.

References buffer_amount.

Referenced by Core::ExternalStream::nextBuffer(), and Core::ExternalStream::setPosition().

00068 {
00069     return buffer_amount;
00070 }

long IOBuffer::lastWriteablePosition (  void   )  [virtual]
 

Definition at line 72 of file IOBuffer.cc.

References _buffer, and Core::ByteArray::size().

Referenced by Core::ExternalWriteStream::nextPut().

00073 {
00074     return _buffer->size() - 1;
00075 }

ByteArray * IOBuffer::nextAndSetOffset (  long &  offset  )  [virtual]
 

Definition at line 92 of file IOBuffer.cc.

References _buffer, buffer_amount, readBufferStartingAt(), Core::ByteArray::size(), and stepToNextBuffer().

Referenced by Core::ExternalStream::nextBuffer().

00093 {
00094     long amt, start;
00095 
00096     stepToNextBuffer();
00097     start = buffer_amount % _buffer->size();
00098     amt = readBufferStartingAt(start);
00099     offset = start;
00100     buffer_amount = start + amt;
00101     return _buffer;
00102 }

long IOBuffer::readBufferStartingAt (  long  position  )  [virtual]
 

Definition at line 118 of file IOBuffer.cc.

References _buffer, io_accessor, Core::IOAccessor::readInto(), and Core::ByteArray::size().

Referenced by nextAndSetOffset(), and readPositionAndSetOffset().

00119 {
00120     long amt;
00121     amt = _buffer->size() - position;
00122     amt = io_accessor->readInto(_buffer, position, amt);
00123     /* Tady by se mely osetrit chyby cteni. */
00124     return amt;
00125 }

ByteArray * IOBuffer::readPositionAndSetOffset (  long  position,
long &  offset
)  [virtual]
 

Definition at line 83 of file IOBuffer.cc.

References _buffer, buffer_amount, io_accessor, readBufferStartingAt(), and Core::IOAccessor::seekTo().

Referenced by Core::ExternalStream::setPosition().

00084 {
00085     io_accessor->seekTo(position);
00086     buffer_amount = readBufferStartingAt(1);
00087     offset = 1;
00088     return _buffer;
00089 }

void IOBuffer::stepToNextBuffer (  void   )  [virtual]
 

Definition at line 127 of file IOBuffer.cc.

Referenced by nextAndSetOffset().

00128 {
00129     /* Does nothing */
00130 }

Member Data Documentation

ByteArray* Core::IOBuffer::_buffer [protected]
 

Definition at line 38 of file IOBuffer.h.

Referenced by buffer(), flushBufferUpTo(), IOBuffer(), lastWriteablePosition(), nextAndSetOffset(), readBufferStartingAt(), and readPositionAndSetOffset().

long Core::IOBuffer::buffer_amount [protected]
 

Definition at line 39 of file IOBuffer.h.

Referenced by IOBuffer(), lastDataPosition(), nextAndSetOffset(), and readPositionAndSetOffset().

IOAccessor* Core::IOBuffer::io_accessor [protected]
 

Definition at line 37 of file IOBuffer.h.

Referenced by commit(), flushBufferUpTo(), IOBuffer(), isSeekable(), readBufferStartingAt(), and readPositionAndSetOffset().

The documentation for this class was generated from the following files:
Generated on Mon Nov 27 09:51:38 2006 for Smalltalk like C++ Class Library by  doxygen 1.4.2