O classes

Description Usage Arguments Fields and Methods Author(s) Examples

Package: R.io
Class File

Object
~~|
~~+--File

Directly known subclasses:

public static class File
extends Object

This class provides methods for accessing files or directories and check their attributes.

An idea of this class is to provide a system independent interface for accessing files and directories. One simple example is that one Windows system file.exists("C:/Windows") returns TRUE, whereas file.exists("C:/Windows/") returns FALSE. This type of different behaviours between different system are the class File trying to overcome.

Unfortunately, I do not have access to more than Unix and WinMe, so I have not been able to verify the correctness on other systems.

1	File(..., expandShortcuts=TRUE)

`...`	A set of `character` strings or File objects specifying the path to a file or a directory. If `""`, the current directory is returned.
`expandShortcuts`	If `TRUE`, Windows shortcut files (*.lnk) are parsed and followed, otherwise just treated as regular files.

Methods:

	`as.character`	Gets a character string representation of the File object.
	`canRead`	Checks if the file can be read.
	`canWrite`	Checks if the file can be written to.
	`chooseFile`	-
	`createNewFile`	Creates a new file.
	`createTempFile`	Creates a temporary file name.
	`erase`	Deletes a file or a directory.
	`getAbsoluteFile`	Gets the absolute path as a File.
	`getAbsolutePath`	Gets the absolute pathname string.
	`getCanonicalFile`	Gets the cannonical form of this pathname.
	`getCanonicalPath`	Gets the cannonical pathname string.
	`getExtension`	Takes a filename and returns the extension.
	`getName`	Gets the name or directory specified by this pathname.
	`getParent`	Gets the string of the parent specified by this pathname.
	`getParentFile`	Gets the parent specified by this pathname.
	`getPath`	Gets the path specified by this pathname.
	`getWithoutExtension`	Takes a filename and returns the filename without the extension.
	`isAbsolute`	Checks if this pathname is absolute.
	`isDirectory`	Checks if the file specification is a directory.
	`isExisting`	Checks if a file or a directory exists.
	`isFile`	Checks if the file specification is a file.
	`lastModified`	Gets the time when the file was last modified.
	`listDir`	Gets the file names in the directory.
	`listFiles`	Gets the files in the directory.
	`mkdir`	Creates a directory.
	`mkdirs`	Creates a directory including any necessary but nonexistent parent directories.
	`print`	Prints information about the File object.
	`removeUps`	-
	`size`	Gets the size of the file.
	`split`	-
	`toURL`	Converts this abstract pathname into a URL.

Methods inherited from Object:
$, $<-, [[, [[<-, as.character, attach, attachLocally, clearCache, clone, detach, equals, extend, finalize, gc, getEnvironment, getFields, getInstanciationTime, getStaticInstance, hasField, hashCode, ll, load, objectSize, print, save

Henrik Bengtsson (http://www.braju.com/R/)

path <- Package("R.io")$path
file <- File(path, "DESCRIPTION")

cat("File             :", as.character(file), "\n")
cat("Can read         :", canRead(file), "\n")
cat("Can write        :", canWrite(file), "\n")
cat("Last modified    :", format(lastModified(file)), "\n")
cat("Size             :", size(file), "bytes\n")
cat("Name             :", getName(file), "\n")
cat("Path             :", getPath(file), "\n")
cat("Parent directory :", getParent(file), "\n")
cat("Canonical path   :", getCanonicalPath(file), "\n")
cat("URL              :", toURL(file), "\n")

path <- getParentFile(file)
cat("\nFiles in the same directory as", as.character(file), "\n")
print(listDir(path))

files <- listFiles(path)
cat("\nFile sizes for all files in", as.character(path), "\n")
for (file in files)
  cat(formatC(getName(file), width=20, flag="-"), "", formatC(size(file), width=6), "bytes\n")