org.clapper.util.io
Class FileUtil

java.lang.Object
  org.clapper.util.io.FileUtil

public class FileUtil
extends java.lang.Object

Static class containing miscellaneous file utility methods.

Version:

$Revision: 6735 $

Author:

Copyright © 2004-2007 Brian M. Clapper

Method Summary

static java.lang.String	basename(java.io.File file) Get the base (i.e., simple file) name of a file.
static java.lang.String	basename(java.lang.String fileName) Get the base (i.e., simple file) name of a file.
static int	copyFile(java.io.File src, java.io.File dst) Copy one file to another.
static int	copyReader(java.io.Reader reader, java.io.Writer writer) Copy characters from a reader to a writer, using a default buffer size.
static int	copyReader(java.io.Reader reader, java.io.Writer writer, int bufferSize) Copy characters from a reader to a writer.
static int	copyStream(java.io.InputStream is, java.io.OutputStream os) Copy an InputStream to an OutputStream.
static int	copyStream(java.io.InputStream src, java.io.OutputStream dst, int bufferSize) Copy an InputStream to an OutputStream.
static int	copyTextFile(java.io.File src, java.lang.String srcEncoding, java.io.File dst, java.lang.String dstEncoding) Copy one file to another, character by character, possibly doing character set conversions
static java.lang.String	dirname(java.io.File file) Get the name of a file's parent directory.
static java.lang.String	dirname(java.lang.String fileName) Get the name of a file's parent directory.
static java.lang.String	getDefaultEncoding() Get the virtual machine's default encoding.
static java.lang.String	getFileNameExtension(java.io.File file) Get the extension for a path or file name.
static java.lang.String	getFileNameExtension(java.lang.String path) Get the extension for a path or file name.
static java.lang.String	getFileNameNoExtension(java.io.File file) Get the name of a file without its extension.
static java.lang.String	getFileNameNoExtension(java.lang.String path) Get the name of a file without its extension.
static boolean	isAbsolutePath(java.lang.String path) Determine whether a string represents an absolute path.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isAbsolutePath

public static boolean isAbsolutePath(java.lang.String path)
                              throws java.io.IOException

Determine whether a string represents an absolute path. On Unix, an absolute path must start with a "/". On Windows, it must begin with one of the machine's valid drive letters.

Parameters:

path - the path to check

Returns:

true if it's absolute, false if not

Throws:

java.io.IOException - on error

copyStream

public static int copyStream(java.io.InputStream is,
                             java.io.OutputStream os)
                      throws java.io.IOException

Copy an InputStream to an OutputStream. If either stream is not already buffered, then it's wrapped in the corresponding buffered stream (i.e., BufferedInputStream or BufferedOutputStream) before copying. Calling this method is equivalent to:

copyStream (src, dst, 8192);

Parameters:

is - the source InputStream

os - the destination OutputStream

Returns:

total number of bytes copied

Throws:

java.io.IOException - on error

See Also:

copyStream(InputStream,OutputStream,int), copyReader(Reader,Writer), copyFile(File,File)

copyStream

public static int copyStream(java.io.InputStream src,
                             java.io.OutputStream dst,
                             int bufferSize)
                      throws java.io.IOException

Copy an InputStream to an OutputStream. If either stream is not already buffered, then it's wrapped in the corresponding buffered stream (i.e., BufferedInputStream or BufferedOutputStream) before copying.

Parameters:

src - the source InputStream

dst - the destination OutputStream

bufferSize - the buffer size to use, or -1 for a default

Returns:

total number of bytes copied

Throws:

java.io.IOException - on error

See Also:

copyReader(Reader,Writer,int), copyStream(InputStream,OutputStream), copyFile(File,File)

copyReader

public static int copyReader(java.io.Reader reader,
                             java.io.Writer writer,
                             int bufferSize)
                      throws java.io.IOException

Copy characters from a reader to a writer. If the reader is not already buffered, then it's wrapped in a BufferedReader, using the specified buffer size. Similarly, buffered stream (i.e., BufferedInputStream or If the writer is not already buffered, then it's wrapped in a BufferedWriter, using the specified buffer size.

Parameters:

reader - where to read from

writer - where to write to

bufferSize - buffer size to use, if reader and writer are not already buffered, or -1 to use a default size.

Returns:

total number of characters copied

Throws:

java.io.IOException - on error

See Also:

copyReader(Reader,Writer), copyStream(InputStream,OutputStream,int), copyStream(InputStream,OutputStream), copyFile(File,File)

copyReader

public static int copyReader(java.io.Reader reader,
                             java.io.Writer writer)
                      throws java.io.IOException

Copy characters from a reader to a writer, using a default buffer size.

Parameters:

reader - where to read from

writer - where to write to

Returns:

total number of characters copied

Throws:

java.io.IOException - on error

See Also:

copyReader(Reader,Writer), copyStream(InputStream,OutputStream,int), copyStream(InputStream,OutputStream), copyFile(File,File)

copyFile

public static int copyFile(java.io.File src,
                           java.io.File dst)
                    throws java.io.IOException

Copy one file to another. This method simply copies bytes and performs no character set conversion. If you want character set conversions, use copyTextFile(File,String,File,String).

Parameters:

src - The file to copy

dst - Where to copy it. Can be a directory or a file.

Returns:

total number of bytes copied

Throws:

java.io.IOException - on error

See Also:

copyTextFile(File,String,File,String), copyReader(Reader,Writer,int), copyReader(Reader,Writer), copyStream(InputStream,OutputStream,int), copyStream(InputStream,OutputStream)

copyTextFile

public static int copyTextFile(java.io.File src,
                               java.lang.String srcEncoding,
                               java.io.File dst,
                               java.lang.String dstEncoding)
                        throws java.io.IOException

Copy one file to another, character by character, possibly doing character set conversions

Parameters:

src - the file to copy

srcEncoding - the character set encoding for the source file, or null to assume the default

dst - Where to copy it. Can be a directory or a file.

dstEncoding - the character set encoding for the destination file, or null to assume the default

Returns:

total number of characters copied

Throws:

java.io.IOException - on error

See Also:

copyFile(File,File), copyReader(Reader,Writer,int), copyReader(Reader,Writer), copyStream(InputStream,OutputStream,int), copyStream(InputStream,OutputStream)

getDefaultEncoding

public static java.lang.String getDefaultEncoding()

Get the virtual machine's default encoding.

Returns:

the default encoding

getFileNameExtension

public static java.lang.String getFileNameExtension(java.io.File file)

Get the extension for a path or file name. Does not include the ".".

Parameters:

file - the file

Returns:

the extension, or null if there isn't one

getFileNameExtension

public static java.lang.String getFileNameExtension(java.lang.String path)

Get the extension for a path or file name. Does not include the ".".

Parameters:

path - the file or path name

Returns:

the extension, or null if there isn't one

getFileNameNoExtension

public static java.lang.String getFileNameNoExtension(java.io.File file)

Get the name of a file without its extension. Does not remove any parent directory components. Uses File.getAbsolutePath(), not File.getCanonicalPath() to get the path.

Parameters:

file - the file

Returns:

the path without the extension

getFileNameNoExtension

public static java.lang.String getFileNameNoExtension(java.lang.String path)

Get the name of a file without its extension. Does not remove any parent directory components.

Parameters:

path - the path

Returns:

the path without the extension

dirname

public static java.lang.String dirname(java.lang.String fileName)

Get the name of a file's parent directory. This is the directory part of the filename. For instance, "/home/foo.zip" would return "/home". This method uses the file's absolute path.

Parameters:

fileName - the file name

Returns:

directory name part of the file's absolute pathname

See Also:

dirname(File), basename(String)

dirname

public static java.lang.String dirname(java.io.File file)

Get the name of a file's parent directory. This is the directory part of the filename. For instance, "/home/foo.zip" would return "/home". This method uses the file's absolute path.

Parameters:

file - the file whose parent directory is to be returned

Returns:

directory name part of the file's absolute pathname

See Also:

dirname(String), basename(File)

basename

public static java.lang.String basename(java.lang.String fileName)

Get the base (i.e., simple file) name of a file. This is the file name stripped of any directory information. For instance, "/home/foo.zip" would return "foo.zip".

Parameters:

fileName - name of the file to get the basename for

Returns:

file name part of the file

See Also:

dirname(String)

basename

public static java.lang.String basename(java.io.File file)

Get the base (i.e., simple file) name of a file. This is the file name stripped of any directory information. For instance, "/home/foo.zip" would return "foo.zip".

Parameters:

file - the file to get the basename for

Returns:

file name part of the file

See Also:

basename(String), dirname(File)