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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_FS_H
#define BACKENDS_FS_H
#include "common/array.h"
#include "common/str.h"
class FilesystemNode;
class AbstractFilesystemNode;
/**
* List of multiple file system nodes. E.g. the contents of a given directory.
* This is subclass instead of just a typedef so that we can use forward
* declarations of it in other places.
*/
class FSList : public Common::Array<FilesystemNode> {};
/*
* FilesystemNode provides an abstraction for file pathes, allowing for portable
* file system browsing. To this ends, multiple or single roots have to be supported
* (compare Unix with a single root, Windows with multiple roots C:, D:, ...).
*
* To this end, we abstract away from paths; implementations can be based on
* paths (and it's left to them whether / or \ or : is the path separator :-);
* but it is also possible to use inodes or vrefs (MacOS 9) or anything else.
*
* NOTE: Backends still have to provide a way to extract a path from a FSIntern
*
* You may ask now: "isn't this cheating? Why do we go through all this when we use
* a path in the end anyway?!?".
* Well, for once as long as we don't provide our own file open/read/write API, we
* still have to use fopen(). Since all our targets already support fopen(), it should
* be possible to get a fopen() compatible string for any file system node.
*
* Secondly, with this abstraction layer, we still avoid a lot of complications based on
* differences in FS roots, different path separators, or even systems with no real
* paths (MacOS 9 doesn't even have the notion of a "current directory").
* And if we ever want to support devices with no FS in the classical sense (Palm...),
* we can build upon this.
*/
class FilesystemNode {
typedef Common::String String;
private:
AbstractFilesystemNode *_realNode;
int *_refCount;
FilesystemNode(AbstractFilesystemNode *realNode);
public:
/**
* Flag to tell listDir() which kind of files to list.
*/
enum ListMode {
kListFilesOnly = 1,
kListDirectoriesOnly = 2,
kListAll = 3
};
/**
* Create a new invalid FilesystemNode. In other words, isValid() for that
* node returns false, and if you try to get it's path, an assert is
* triggered.
*/
FilesystemNode();
/**
* Create a new FilesystemNode referring to the specified path. This is
* the counterpart to the path() method.
*
* If path is empty or equals ".", then a node representing the "current
* directory" will be created. If that is not possible (since e.g. the
* operating system doesn't support the concept), some other directory is
* used (usually the root directory).
*/
FilesystemNode(const String &path);
/**
* Copy constructor.
*/
FilesystemNode(const FilesystemNode &node);
/**
* Destructor.
*/
virtual ~FilesystemNode();
/**
* Copy operator.
*/
FilesystemNode &operator =(const FilesystemNode &node);
/**
* Get the parent node of this node. If this node has no parent node,
* then it returns a duplicate of this node.
*/
FilesystemNode getParent() const;
/**
* Fetch a child node of this node, with the given name. Only valid for
* directory nodes (an assertion is triggered otherwise). If no no child
* node with the given name exists, an invalid node is returned.
*/
FilesystemNode getChild(const String &name) const;
/**
* Return a list of child nodes of this directory node. If called on a node
* that does not represent a directory, false is returned.
* @return true if succesful, false otherwise (e.g. when the directory does not exist).
* @todo Rename this to listChildren or getChildren.
*/
virtual bool listDir(FSList &fslist, ListMode mode = kListDirectoriesOnly) const;
/**
* Return a human readable string for this node, usable for display (e.g.
* in the GUI code). Do *not* rely on it being usable for anything else,
* like constructing paths!
* @return the display name
*/
virtual String displayName() const;
/**
* Is this node pointing to a directory?
* @todo Currently we assume that a valid node that is not a directory
* automatically is a file (ignoring things like symlinks). That might
* actually be OK... but we could still add an isFile method. Or even replace
* isValid and isDirectory by a getType() method that can return values like
* kDirNodeType, kFileNodeType, kInvalidNodeType.
*/
virtual bool isDirectory() const;
/**
* Return a string representation of the file which can be passed to fopen(),
* and is suitable for archiving (i.e. writing to the config file).
* This will usually be a 'path' (hence the name of the method), but can
* be anything that fulfilly the above criterions.
*/
virtual String path() const;
/**
* Compare the name of this node to the name of another. Directories
* go before normal files.
*/
bool operator< (const FilesystemNode& node) const;
protected:
void decRefCount();
};
#endif
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