base/CacheDirectory

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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: CacheDirectory 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_CACHEDIRECTORY_
#define _BASE_CACHEDIRECTORY_

#include <base/base>
#include <base/VDirectory>
#include <base/CacheFile>

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


namespace base {

class CacheDirectory : public VDirectory
{
public:
  virtual ~CacheDirectory();

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

  virtual void operator=(const CacheDirectory& d);
  
  virtual bool contains(ref<const VEntry> name) const;
  virtual bool contains(const PathName& name) const;

  virtual ref<VFile>      file(const PathName& name) const throw(path_not_found); ///< construct a new VFile object 
  virtual ref<VDirectory> directory(const PathName& name) const throw(path_not_found); ///< construct a new VDirectory object

  virtual ref<VFile>      createFile(const PathName& name) const throw(io_error); ///< create a new file in this directory
  virtual void            deleteFile(const PathName& name) const throw(path_not_found, io_error); ///< delete a file in this directory
  virtual ref<VDirectory> createDirectory(const PathName& name) const throw(io_error); ///< create a new directory in this directory
  virtual void            deleteDirectory(const PathName& name) const throw(path_not_found, io_error); ///< delete a directory in this directory

protected:
  ref<VEntry> find(const String& name) const;
  ref<VDirectory> actualDir;
  String prefix;

  void load() const;
  virtual ref<VEntry> entry(Int i) const;
  virtual Int size() const;

  mutable bool loaded;
  typedef array<ref<CacheFile> > CacheFileEntries;
  mutable CacheFileEntries entries;

  CacheDirectory(const CacheDirectory& d);
  CacheDirectory(ref<VDirectory> actualDir, const String& prefix);

  friend class Cache;
};

} // base

#endif

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