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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2006 The ScummVM project
*
* This program 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#ifndef BACKENDS_ABSTRACT_FS_H
#define BACKENDS_ABSTRACT_FS_H
#include "common/array.h"
#include "common/str.h"
#include "common/fs.h"
class AbstractFilesystemNode;
typedef Common::Array<AbstractFilesystemNode *> AbstractFSList;
/**
* Abstract file system node. Private subclasses implement the actual
* functionality.
*
* Most of the methods correspond directly to methods in class FilesystemNode,
* so if they are not documented here, look there for more information about
* the semantics.
*/
class AbstractFilesystemNode {
protected:
friend class FilesystemNode;
typedef Common::String String;
typedef FilesystemNode::ListMode ListMode;
/**
* The parent node of this directory.
* The parent of the root is the root itself.
*/
virtual AbstractFilesystemNode *parent() const = 0;
/**
* The child node with the given name. If no child with this name
* exists, returns 0. When called on a non-directory node, it should
* handle this gracefully by returning 0.
*
* @note Handling calls on non-dir nodes gracefully makes it possible to
* switch to a lazy type detection scheme in the future.
*/
virtual AbstractFilesystemNode *child(const String &name) const = 0;
/**
* Returns a special node representing the FS root. The starting point for
* any file system browsing.
* On Unix, this will be simply the node for / (the root directory).
* On Windows, it will be a special node which "contains" all drives (C:, D:, E:).
*/
static AbstractFilesystemNode *getRoot();
/**
* Returns a node representing the "current directory". If your system does
* not support this concept, you can either try to emulate it or
* simply return some "sensible" default directory node, e.g. the same
* value as getRoot() returns.
*/
static AbstractFilesystemNode *getCurrentDirectory();
/**
* Construct a node based on a path; the path is in the same format as it
* would be for calls to fopen().
*
* Furthermore getNodeForPath(oldNode.path()) should create a new node
* identical to oldNode. Hence, we can use the "path" value for persistent
* storage e.g. in the config file.
*
* @todo: This is of course a place where non-portable code easily will sneak
* in, because the format of the path used here is not well-defined.
* So we really should reconsider this API and try to come up with
* something which is more portable but still flexible enough for our
* purposes.
*/
static AbstractFilesystemNode *getNodeForPath(const String &path);
public:
virtual ~AbstractFilesystemNode() {}
virtual String name() const = 0;
// By default, we use the actual file name as 'display name'.
virtual String displayName() const { return name(); }
virtual bool isValid() const = 0;
virtual bool isDirectory() const = 0;
/**
* Return the 'path' of the current node, usable in fopen(). See also
* the static getNodeForPath() method.
*/
virtual String path() const = 0;
virtual bool listDir(AbstractFSList &list, ListMode mode) const = 0;
/* TODO:
bool exists();
bool isDirectory();
bool isFile();
bool isReadable();
bool isWriteable();
*/
};
#endif
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