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// File: LDOM_OSStream.hxx
// Created: 01.10.01 10:56:06
// Author: Julia DOROVSKIKH
// Copyright: Open Cascade 2001
#ifndef LDOM_OSStream_HeaderFile
#define LDOM_OSStream_HeaderFile
// This implementation allows to increase performance
// of outputting data into a string
// avoiding reallocation of buffer.
//
// class LDOM_OSStream implements output into a sequence of
// strings and getting the result as a string.
// It inherits Standard_OStream (ostream).
// Beside methods of ostream, it also has additional
// useful methods: str(), Length() and Clear().
//
// struct LDOM_StringElem is one element of internal sequence
//
// class LDOM_SBuffer inherits streambuf and
// redefines some virtual methods of it
// (overflow() and xsputn())
// This class contains pointers on first
// and current element of sequence,
// also it has methods for the sequence management.
#include <Standard_OStream.hxx>
#include <Standard_Boolean.hxx>
#include <stdlib.h>
#include <stdio.h> /* EOF */
class LDOM_StringElem; // defined in cxx file
class LDOM_SBuffer : public streambuf
{
public:
Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf);
// Constructor. Sets a default value for the
// length of each sequence element.
Standard_EXPORT Standard_CString str () const;
// Concatenates strings of all sequence elements
// into one string. Space for output string is allocated
// with operator new.
// Caller of this function is responsible
// for memory release after the string usage.
Standard_Integer Length () const {return myLength;};
// Returns full length of data contained
Standard_EXPORT void Clear ();
// Clears first element of sequence and removes all others
// Methods of streambuf
Standard_EXPORT virtual int overflow(signed char c = EOF);
Standard_EXPORT virtual int underflow();
//virtual int uflow();
Standard_EXPORT virtual std::streamsize xsputn(const char* s, std::streamsize n);
//virtual int xsgetn(char* s, int n);
//virtual int sync();
Standard_EXPORT ~LDOM_SBuffer ();
// Destructor
private:
Standard_Integer myMaxBuf; // default length of one element
Standard_Integer myLength; // full length of contained data
LDOM_StringElem* myFirstString; // the head of the sequence
LDOM_StringElem* myCurString; // current element of the sequence
};
class LDOM_OSStream : public Standard_OStream
{
public:
Standard_EXPORT LDOM_OSStream (const Standard_Integer theMaxBuf);
// Constructor
Standard_CString str () const {return myBuffer.str();};
Standard_Integer Length () const {return myBuffer.Length();};
void Clear () { myBuffer.Clear(); };
private:
LDOM_SBuffer myBuffer;
};
#endif
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