file.h

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//
// File.h
//
// $Id: //poco/1.3/Foundation/include/Poco/File.h#4 $
//
// Library: Foundation
// Package: Filesystem
// Module:  File
//
// Definition of the File class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_File_INCLUDED
#define Foundation_File_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"
#include <vector>


#if defined(POCO_OS_FAMILY_WINDOWS) && defined(POCO_WIN32_UTF8)
#include "Poco/File_WIN32U.h"
#elif defined(POCO_OS_FAMILY_WINDOWS)
#include "Poco/File_WIN32.h"
#elif defined(POCO_OS_FAMILY_UNIX)
#include "Poco/File_UNIX.h"
#else
#include "Poco/File_VMS.h"
#endif


namespace Poco {


class Path;


class Foundation_API File: private FileImpl
	/// The File class provides methods for working with a file.
{
public:
	typedef FileSizeImpl FileSize;

	File();
		/// Creates the file.

	File(const std::string& path);
		/// Creates the file.
		
	File(const char* path);
		/// Creates the file.

	File(const Path& path);
		/// Creates the file.
		
	File(const File& file);
		/// Copy constructor.

	virtual ~File();
		/// Destroys the file.
	
	File& operator = (const File& file);
		/// Assignment operator.

	File& operator = (const std::string& path);
		/// Assignment operator.

	File& operator = (const char* path);
		/// Assignment operator.

	File& operator = (const Path& path);
		/// Assignment operator.
		
	void swap(File& file);
		/// Swaps the file with another one.

	const std::string& path() const;
		/// Returns the path.
	
	bool exists() const;
		/// Returns true iff the file exists.
		
	bool canRead() const;
		/// Returns true iff the file is readable.
		
	bool canWrite() const;
		/// Returns true iff the file is writeable.

	bool canExecute() const;
		/// Returns true iff the file is executable.
		///
		/// On Windows and OpenVMS, the file must have
		/// the extension ".EXE" to be executable.
		/// On Unix platforms, the executable permission
		/// bit must be set.

	bool isFile() const;
		/// Returns true iff the file is a regular file.
		
	bool isLink() const;
		/// Returns true iff the file is a symbolic link.
		
	bool isDirectory() const;
		/// Returns true iff the file is a directory.

	bool isHidden() const;
		/// Returns true if the file is hidden.
		///
		/// On Windows platforms, the file's hidden
		/// attribute is set for this to be true.
		///
		/// On Unix platforms, the file name must
		/// begin with a period for this to be true.

	Timestamp created() const;
		/// Returns the creation date of the file.

	Timestamp getLastModified() const;
		/// Returns the modification date of the file.
		
	void setLastModified(const Timestamp& ts);
		/// Sets the modification date of the file.
		
	FileSize getSize() const;
		/// Returns the size of the file in bytes.
		
	void setSize(FileSize size);
		/// Sets the size of the file in bytes. Can be used
		/// to truncate a file.
		
	void setWriteable(bool flag = true);
		/// Makes the file writeable (if flag is true), or
		/// non-writeable (if flag is false) by setting the
		/// file's flags in the filesystem accordingly.
		
	void setReadOnly(bool flag = true);
		/// Makes the file non-writeable (if flag is true), or
		/// writeable (if flag is false) by setting the
		/// file's flags in the filesystem accordingly.
		
	void setExecutable(bool flag = true);
		/// Makes the file executable (if flag is true), or
		/// non-executable (if flag is false) by setting
		/// the file's permission bits accordingly.
		///
		/// Does nothing on Windows and OpenVMS.	
		
	void copyTo(const std::string& path) const;
		/// Copies the file (or directory) to the given path. 
		/// The target path can be a directory.
		///
		/// A directory is copied recursively.

	void moveTo(const std::string& path);
		/// Copies the file (or directory) to the given path and 
		/// removes the original file. The target path can be a directory.
		
	void renameTo(const std::string& path);
		/// Renames the file to the new name.
		
	void remove(bool recursive = false);
		/// Deletes the file. If recursive is true and the
		/// file is a directory, recursively deletes all
		/// files in the directory.
	
	bool createFile();
		/// Creates a new, empty file in an atomic operation.
		/// Returns true if the file has been created and false
		/// if the file already exists. Throws an exception if
		/// an error occurs.
	
	bool createDirectory();
		/// Creates a directory. Returns true if the directory
		/// has been created and false if it already exists.
		/// Throws an exception if an error occurs.
	
	void createDirectories();
		/// Creates a directory (and all parent directories
		/// if necessary).
		
	void list(std::vector<std::string>& files) const;
		/// Fills the vector with the names of all
		/// files in the directory.

	void list(std::vector<File>& files) const;
		/// Fills the vector with the names of all
		/// files in the directory.

	bool operator == (const File& file) const;
	bool operator != (const File& file) const;
	bool operator <  (const File& file) const;
	bool operator <= (const File& file) const;
	bool operator >  (const File& file) const;
	bool operator >= (const File& file) const;
	
	static void handleLastError(const std::string& path);
		/// For internal use only. Throws an appropriate
		/// exception for the last file-related error.

protected:
	void copyDirectory(const std::string& path) const;
		/// Copies a directory. Used internally by copyTo().
};


//
// inlines
//
inline const std::string& File::path() const
{
	return getPathImpl();
}


inline bool File::operator == (const File& file) const
{
	return getPathImpl() == file.getPathImpl();
}


inline bool File::operator != (const File& file) const
{
	return getPathImpl() != file.getPathImpl();
}


inline bool File::operator < (const File& file) const
{
	return getPathImpl() < file.getPathImpl();
}


inline bool File::operator <= (const File& file) const
{
	return getPathImpl() <= file.getPathImpl();
}


inline bool File::operator > (const File& file) const
{
	return getPathImpl() > file.getPathImpl();
}


inline bool File::operator >= (const File& file) const
{
	return getPathImpl() >= file.getPathImpl();
}


inline void swap(File& f1, File& f2)
{
	f1.swap(f2);
}


} // namespace Poco


#endif // Foundation_File_INCLUDED