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307 lines
8.1 KiB
C++
307 lines
8.1 KiB
C++
//
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// File.h
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//
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// Library: Foundation
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// Package: Filesystem
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// Module: File
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//
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// Definition of the File class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_File_INCLUDED
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#define Foundation_File_INCLUDED
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#include <vector>
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#include "Poco/Foundation.h"
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#include "Poco/Timestamp.h"
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#if defined(POCO_OS_FAMILY_UNIX)
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# include "Poco/File_UNIX.h"
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#endif
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namespace Poco
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{
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class Path;
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class Foundation_API File : private FileImpl
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/// The File class provides methods for working with a file.
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///
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/// Regarding paths passed to the various methods, note that
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/// platform-specific limitations regarding maximum length
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/// of the entire path and its components apply.
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///
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/// On Windows, if compiled with UTF-8 support (POCO_WIN32_UTF8)
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/// the implementation tries to work around the rather low
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/// 260 characters MAX_PATH limit by adding the "\\?\" prefix if
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/// a path is absolute and exceeds MAX_PATH characters in length.
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/// Note that various limitations regarding usage of the "\\?\"
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/// prefix apply in that case, e.g. the path must
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/// not contain relative components ("." and "..") and must not
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/// use the forward slash ("/") as directory separator.
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{
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public:
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typedef FileSizeImpl FileSize;
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enum LinkType
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/// Type of link for linkTo().
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{
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LINK_HARD = 0, /// hard link
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LINK_SYMBOLIC = 1 /// symbolic link
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};
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File();
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/// Creates the file.
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File(const std::string & path);
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/// Creates the file.
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File(const char * path);
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/// Creates the file.
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File(const Path & path);
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/// Creates the file.
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File(const File & file);
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/// Copy constructor.
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virtual ~File();
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/// Destroys the file.
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File & operator=(const File & file);
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/// Assignment operator.
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File & operator=(const std::string & path);
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/// Assignment operator.
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File & operator=(const char * path);
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/// Assignment operator.
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File & operator=(const Path & path);
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/// Assignment operator.
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void swap(File & file);
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/// Swaps the file with another one.
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const std::string & path() const;
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/// Returns the path.
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bool exists() const;
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/// Returns true iff the file exists.
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bool canRead() const;
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/// Returns true iff the file is readable.
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bool canWrite() const;
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/// Returns true iff the file is writeable.
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bool canExecute() const;
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/// Returns true iff the file is executable.
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///
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/// On Windows, the file must have
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/// the extension ".EXE" to be executable.
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/// On Unix platforms, the executable permission
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/// bit must be set.
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bool isFile() const;
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/// Returns true iff the file is a regular file.
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bool isLink() const;
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/// Returns true iff the file is a symbolic link.
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bool isDirectory() const;
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/// Returns true iff the file is a directory.
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bool isDevice() const;
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/// Returns true iff the file is a device.
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bool isHidden() const;
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/// Returns true if the file is hidden.
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///
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/// On Windows platforms, the file's hidden
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/// attribute is set for this to be true.
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///
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/// On Unix platforms, the file name must
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/// begin with a period for this to be true.
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Timestamp created() const;
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/// Returns the creation date of the file.
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///
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/// Not all platforms or filesystems (e.g. Linux and most Unix
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/// platforms with the exception of FreeBSD and Mac OS X)
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/// maintain the creation date of a file.
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/// On such platforms, created() returns
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/// the time of the last inode modification.
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Timestamp getLastModified() const;
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/// Returns the modification date of the file.
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File & setLastModified(const Timestamp & ts);
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/// Sets the modification date of the file.
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FileSize getSize() const;
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/// Returns the size of the file in bytes.
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File & setSize(FileSize size);
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/// Sets the size of the file in bytes. Can be used
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/// to truncate a file.
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File & setWriteable(bool flag = true);
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/// Makes the file writeable (if flag is true), or
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/// non-writeable (if flag is false) by setting the
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/// file's flags in the filesystem accordingly.
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File & setReadOnly(bool flag = true);
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/// Makes the file non-writeable (if flag is true), or
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/// writeable (if flag is false) by setting the
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/// file's flags in the filesystem accordingly.
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File & setExecutable(bool flag = true);
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/// Makes the file executable (if flag is true), or
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/// non-executable (if flag is false) by setting
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/// the file's permission bits accordingly.
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///
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/// Does nothing on Windows.
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void copyTo(const std::string & path) const;
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/// Copies the file (or directory) to the given path.
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/// The target path can be a directory.
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///
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/// A directory is copied recursively.
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void moveTo(const std::string & path);
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/// Copies the file (or directory) to the given path and
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/// removes the original file. The target path can be a directory.
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void renameTo(const std::string & path);
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/// Renames the file to the new name.
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void linkTo(const std::string & path, LinkType type = LINK_SYMBOLIC) const;
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/// Creates a link (symbolic or hard, depending on type argument)
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/// at the given path to the file or directory.
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///
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/// May not be supported on all platforms.
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/// Furthermore, some operating systems do not allow creating
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/// hard links to directories.
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void remove(bool recursive = false);
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/// Deletes the file. If recursive is true and the
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/// file is a directory, recursively deletes all
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/// files in the directory.
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bool createFile();
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/// Creates a new, empty file in an atomic operation.
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/// Returns true if the file has been created and false
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/// if the file already exists. Throws an exception if
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/// an error occurs.
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bool createDirectory();
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/// Creates a directory. Returns true if the directory
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/// has been created and false if it already exists.
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/// Throws an exception if an error occurs.
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void createDirectories();
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/// Creates a directory (and all parent directories
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/// if necessary).
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void list(std::vector<std::string> & files) const;
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/// Fills the vector with the names of all
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/// files in the directory.
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void list(std::vector<File> & files) const;
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/// Fills the vector with the names of all
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/// files in the directory.
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FileSize totalSpace() const;
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/// Returns the total size in bytes of the partition containing this path.
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FileSize usableSpace() const;
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/// Returns the number of usable free bytes on the partition containing this path.
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FileSize freeSpace() const;
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/// Returns the number of free bytes on the partition containing this path.
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bool operator==(const File & file) const;
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bool operator!=(const File & file) const;
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bool operator<(const File & file) const;
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bool operator<=(const File & file) const;
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bool operator>(const File & file) const;
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bool operator>=(const File & file) const;
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static void handleLastError(const std::string & path);
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/// For internal use only. Throws an appropriate
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/// exception for the last file-related error.
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protected:
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void copyDirectory(const std::string & path) const;
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/// Copies a directory. Used internally by copyTo().
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};
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//
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// inlines
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//
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inline const std::string & File::path() const
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{
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return getPathImpl();
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}
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inline bool File::operator==(const File & file) const
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{
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return getPathImpl() == file.getPathImpl();
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}
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inline bool File::operator!=(const File & file) const
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{
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return getPathImpl() != file.getPathImpl();
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}
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inline bool File::operator<(const File & file) const
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{
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return getPathImpl() < file.getPathImpl();
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}
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inline bool File::operator<=(const File & file) const
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{
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return getPathImpl() <= file.getPathImpl();
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}
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inline bool File::operator>(const File & file) const
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{
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return getPathImpl() > file.getPathImpl();
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}
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inline bool File::operator>=(const File & file) const
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{
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return getPathImpl() >= file.getPathImpl();
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}
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inline void swap(File & f1, File & f2)
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{
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f1.swap(f2);
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}
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} // namespace Poco
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#endif // Foundation_File_INCLUDED
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