base/CacheFile

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/****************************************************************************
  Copyright (C)1996 David Jung <opensim@pobox.com>

  This program/file is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details. (http://www.gnu.org)
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  $Id: CacheFile 1029 2004-02-11 20:45:54Z jungd $
  $Revision: 1.3 $
  $Date: 2004-02-11 15:45:54 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

#ifndef _BASE_CACHEFILE_
#define _BASE_CACHEFILE_

#include <base/base>
#include <base/VFile>
#include <base/path_not_found>
#include <base/io_error>


#include <string>

namespace base {

class CacheFile : public VFile
{
public:
  virtual ~CacheFile();

  virtual String className() const { return String("CacheFile"); }
  virtual Object& clone() const { return *NewNamedObj(className()) CacheFile(*this); }

  virtual const PathName path() const { return PathName(String()+PathName::separator); }
  virtual const PathName pathName() const { return path()+pathname.name(); }

  virtual String extension() const { return pathname.extension(); }  // the file's extension (e.g. .png)

  virtual std::istream&  istream() const throw(io_error);
  virtual std::ostream&  ostream() const throw(io_error);
  virtual std::iostream& iostream(std::iostream::openmode mode = (std::iostream::in | std::iostream::out) ) const throw(io_error);

  virtual void close() const throw(io_error); // close the file (can be re-opened again via istream/ostream/iostream() )

protected:
  ref<VFile> actualFile;

  CacheFile(const CacheFile& f) 
    : VFile(f), actualFile(f.actualFile) {}
  CacheFile(const String& name, ref<VFile> actualFile)
    : VFile(PathName(name)), actualFile(actualFile) {}

  friend class CacheDirectory;
  friend class VFileSystem;
};

} // base

#endif

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