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// -*- C++ -*-
//=============================================================================
/**
* @file CharStream.h
*
* $Id: CharStream.h 91257 2010-08-03 11:54:04Z johnnyw $
*
* @author Nanbor Wang <nanbor@cs.wustl.edu>
*/
//=============================================================================
#ifndef _ACEXML_CHARSTREAM_H_
#define _ACEXML_CHARSTREAM_H_
#include /**/ "ace/pre.h"
#include "ACEXML/common/ACEXML_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ACEXML/common/XML_Types.h"
/**
* @class ACEXML_CharStream CharStream.h "ACEXML/common/CharStream.h"
*
* ACEXML_CharStream is an abstract class (interface) which defines the
* basic opertions a parser could use to retrieve XML charater sequence.
* The sequence can be read from a file or a character buffer.
*/
class ACEXML_Export ACEXML_CharStream
{
public:
/**
* Virtual destructor, must have.
*/
virtual ~ACEXML_CharStream (void) = 0;
/**
* Returns the available ACEXML_Char in the buffer. -1
* if the object is not initialized properly.
*/
virtual int available (void) = 0;
/**
* Close this stream and release all resources used by it.
*/
virtual int close (void) = 0;
/**
* Read the next ACEXML_Char. Return -1 if we are not able to
* return an ACEXML_Char, 0 if EOS is reached, or 1 if succeed.
*/
virtual int get (ACEXML_Char& ch) = 0;
/**
* Read the next batch of ACEXML_Char strings
*/
virtual int read (ACEXML_Char *str, size_t len) = 0;
/**
* Peek the next ACEXML_Char in the CharStream. Return the
* character if succeess, -1 if EOS is reached.
*/
virtual int peek (void) = 0;
/**
* Resets the pointer to the beginning of the stream.
*/
virtual void rewind (void) = 0;
/*
* Get the character encoding for a byte stream or URI.
*/
virtual const ACEXML_Char *getEncoding (void) = 0;
/*
* Get the systemId for the underlying CharStream
*/
virtual const ACEXML_Char* getSystemId (void) = 0;
};
#include /**/ "ace/post.h"
#endif /* _ACEXML_CHARSTREAM_H_ */
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