OW_StringStream.hpp

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#ifndef OW_STRINGSTREAM_HPP_INCLUDE_GUARD_
#define OW_STRINGSTREAM_HPP_INCLUDE_GUARD_
#include "OW_config.h"
#include "OW_StringBuffer.hpp"
#include "OW_BaseStreamBuffer.hpp"
#if defined(OW_HAVE_OSTREAM) && defined(OW_HAVE_ISTREAM)
#include <istream>
#include <ostream>
#else
#include <iostream>
#endif
#ifdef OW_HAVE_STREAMBUF
#include <streambuf>
#else
#include <streambuf.h>
#endif

namespace OW_NAMESPACE
{

class IStringStreamBuf : public std::streambuf
{
public:
   IStringStreamBuf(const String& s)
      : std::streambuf()
      , m_buf(s)
   {
      setg(const_cast<char*>(reinterpret_cast<const char*>(m_buf.c_str())),
         const_cast<char*>(reinterpret_cast<const char*>(m_buf.c_str())),
         const_cast<char*>(reinterpret_cast<const char*>(m_buf.c_str()+m_buf.length())));
   }
protected:
   int underflow()
   {
      return (gptr() < egptr()) ? static_cast<unsigned char>(*gptr()) : EOF;  // need a static_cast so a -1 doesn't turn into an EOF
   }
private:
   String m_buf;
};
class IStringStreamBase
{
public:
   IStringStreamBase(const String& s) : m_buf(s) {}
   mutable IStringStreamBuf m_buf;
};

class IStringStream : private IStringStreamBase, public std::istream
{
public:
   IStringStream(const String& s);
   ~IStringStream();
   void reset();
private:
   // not implemented
   IStringStream(const IStringStream&);
   IStringStream& operator=(const IStringStream&);
};

class OW_COMMON_API OStringStreamBuf : public BaseStreamBuffer
{
public:
   OStringStreamBuf(size_t size);
   virtual ~OStringStreamBuf();
   String toString() const;
   // After calling releaseString(), this OStringStream is unusable
   String releaseString();
   size_t length() const;
   const char* c_str() const;
   void reset();
protected:
   virtual int buffer_to_device(const char *c, int n);
private:
   StringBuffer m_buf;
   friend class OStringStream;
};
class OW_COMMON_API OStringStreamBase
{
public:
   OStringStreamBase(size_t sz);
   mutable OStringStreamBuf m_buf;
};
class OW_COMMON_API OStringStream : private OStringStreamBase, public std::ostream
{
public:
   OStringStream(size_t size = 256);
   ~OStringStream();
   OStringStream(const OStringStream&);
   OStringStream& operator=(const OStringStream&);  
   String toString() const;
   // After calling releaseString(), this OStringStream is unusable
   String releaseString();
   size_t length() const;
   const char* c_str() const;
   void reset();
};

} // end namespace OW_NAMESPACE

#endif

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