org.eclipse.jgit.util

Class FileUtils

java.lang.Object

org.eclipse.jgit.util.FileUtils

public class FileUtils
extends Object

File Utilities

Field Summary

Fields

Modifier and Type	Field and Description
static int	EMPTY_DIRECTORIES_ONLY Option to only delete empty directories.
static int	IGNORE_ERRORS Option not to throw exceptions when a deletion finally doesn't succeed.
static int	NONE Option to delete given File
static int	RECURSIVE Option to recursively delete given File
static int	RETRY Option to retry deletion if not successful
static int	SKIP_MISSING Option to skip deletion if file doesn't exist

Constructor Summary

Constructors

Constructor and Description
FileUtils()

Method Summary

Modifier and Type	Method and Description
static boolean	canExecute(File file) Whether the given file can be executed.
static File	canonicalize(File file) Best-effort variation of File.getCanonicalFile() returning the input file if the file cannot be canonicalized instead of throwing IOException.
static void	createNewFile(File f) Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist.
static Path	createSymLink(File path, String target) Create a symbolic link
static File	createTempDir(String prefix, String suffix, File dir) Create a temporary directory.
static long	delay(long last, long min, long max) Compute a delay in a min..max interval with random jitter.
static void	delete(File f) Delete file or empty folder
static void	delete(File f, int options) Delete file or folder
static FS.Attributes	getFileAttributesPosix(FS fs, File file) Get file system attributes for the given file.
static long	getLength(File file) Get file length
static boolean	isStaleFileHandle(IOException ioe) Determine if an IOException is a Stale NFS File Handle
static boolean	isStaleFileHandleInCausalChain(Throwable throwable) Determine if a throwable or a cause in its causal chain is a Stale NFS File Handle
static void	mkdir(File d) Creates the directory named by this abstract pathname.
static void	mkdir(File d, boolean skipExisting) Creates the directory named by this abstract pathname.
static void	mkdirs(File d) Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories.
static void	mkdirs(File d, boolean skipExisting) Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories.
static File	normalize(File file) NFC normalize a file (on Mac), otherwise do nothing
static String	normalize(String name) On Mac: get NFC normalized form of given name, otherwise the given name.
static String	pathToString(File file) Convert a path to String, replacing separators as necessary.
static String	readSymLink(File path) Read target path of the symlink.
static String	relativizeGitPath(String base, String other) Expresses other as a relative file path from base.
static String	relativizeNativePath(String base, String other) Expresses other as a relative file path from base.
static String	relativizePath(String base, String other, String dirSeparator, boolean caseSensitive) Expresses other as a relative file path from base
static void	rename(File src, File dst) Rename a file or folder.
static void	rename(File src, File dst, CopyOption... options) Rename a file or folder using the passed CopyOptions.
static void	setHidden(File file, boolean hidden) Set a file hidden (on Windows)
static Path	toPath(File f) Safe conversion from File to Path.
static void	touch(Path f) Touch the given file

Methods inherited from class java.lang.Object

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

Field Detail

NONE

public static final int NONE

Option to delete given File

See Also:

Constant Field Values

RECURSIVE

public static final int RECURSIVE

Option to recursively delete given File

See Also:

Constant Field Values

RETRY

public static final int RETRY

Option to retry deletion if not successful

See Also:

Constant Field Values

SKIP_MISSING

public static final int SKIP_MISSING

Option to skip deletion if file doesn't exist

See Also:

Constant Field Values

IGNORE_ERRORS

public static final int IGNORE_ERRORS

Option not to throw exceptions when a deletion finally doesn't succeed.

Since:

2.0

See Also:

Constant Field Values

EMPTY_DIRECTORIES_ONLY

public static final int EMPTY_DIRECTORIES_ONLY

Option to only delete empty directories. This option can be combined with RECURSIVE

Since:

3.0

See Also:

Constant Field Values

Constructor Detail

FileUtils

public FileUtils()

Method Detail

toPath

public static Path toPath(File f)
                   throws IOException

Safe conversion from File to Path.

Parameters:

f - File to be converted to Path

Returns:

the path represented by the file

Throws:

IOException - in case the path represented by the file is not valid ( InvalidPathException)

Since:

4.10

delete

public static void delete(File f)
                   throws IOException

Delete file or empty folder

Parameters:

f - File to be deleted

Throws:

IOException - if deletion of f fails. This may occur if f didn't exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to delete the same file.

delete

public static void delete(File f,
                          int options)
                   throws IOException

Delete file or folder

Parameters:

f - File to be deleted

options - deletion options, RECURSIVE for recursive deletion of a subtree, RETRY to retry when deletion failed. Retrying may help if the underlying file system doesn't allow deletion of files being read by another thread.

Throws:

IOException - if deletion of f fails. This may occur if f didn't exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to delete the same file. This exception is not thrown when IGNORE_ERRORS is set.

rename

public static void rename(File src,
                          File dst)
                   throws IOException

Rename a file or folder. If the rename fails and if we are running on a filesystem where it makes sense to repeat a failing rename then repeat the rename operation up to 9 times with 100ms sleep time between two calls. Furthermore if the destination exists and is directory hierarchy with only directories in it, the whole directory hierarchy will be deleted. If the target represents a non-empty directory structure, empty subdirectories within that structure may or may not be deleted even if the method fails. Furthermore if the destination exists and is a file then the file will be deleted and then the rename is retried.

This operation is not atomic.

Parameters:

src - the old File

dst - the new File

Throws:

IOException - if the rename has failed

Since:

3.0

See Also:

FS.retryFailedLockFileCommit()

rename

public static void rename(File src,
                          File dst,
                          CopyOption... options)
                   throws AtomicMoveNotSupportedException,
                          IOException

Rename a file or folder using the passed CopyOptions. If the rename fails and if we are running on a filesystem where it makes sense to repeat a failing rename then repeat the rename operation up to 9 times with 100ms sleep time between two calls. Furthermore if the destination exists and is a directory hierarchy with only directories in it, the whole directory hierarchy will be deleted. If the target represents a non-empty directory structure, empty subdirectories within that structure may or may not be deleted even if the method fails. Furthermore if the destination exists and is a file then the file will be replaced if StandardCopyOption.REPLACE_EXISTING has been set. If StandardCopyOption.ATOMIC_MOVE has been set the rename will be done atomically or fail with an AtomicMoveNotSupportedException

Parameters:

src - the old file

dst - the new file

options - options to pass to Files.move(java.nio.file.Path, java.nio.file.Path, CopyOption...)

Throws:

AtomicMoveNotSupportedException - if file cannot be moved as an atomic file system operation

IOException

Since:

4.1

mkdir

public static void mkdir(File d)
                  throws IOException

Creates the directory named by this abstract pathname.

Parameters:

d - directory to be created

Throws:

IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

mkdir

public static void mkdir(File d,
                         boolean skipExisting)
                  throws IOException

Creates the directory named by this abstract pathname.

Parameters:

d - directory to be created

skipExisting - if true skip creation of the given directory if it already exists in the file system

Throws:

IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

mkdirs

public static void mkdirs(File d)
                   throws IOException

Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.

Parameters:

d - directory to be created

Throws:

IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

mkdirs

public static void mkdirs(File d,
                          boolean skipExisting)
                   throws IOException

Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.

Parameters:

d - directory to be created

skipExisting - if true skip creation of the given directory if it already exists in the file system

Throws:

IOException - if creation of d fails. This may occur if d did exist when the method was called. This can therefore cause java.io.IOExceptions during race conditions when multiple concurrent threads all try to create the same directory.

createNewFile

public static void createNewFile(File f)
                          throws IOException

Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist. The check for the existence of the file and the creation of the file if it does not exist are a single operation that is atomic with respect to all other filesystem activities that might affect the file.

Note: this method should not be used for file-locking, as the resulting protocol cannot be made to work reliably. The FileLock facility should be used instead.

Parameters:

f - the file to be created

Throws:

IOException - if the named file already exists or if an I/O error occurred

createSymLink

public static Path createSymLink(File path,
                                 String target)
                          throws IOException

Create a symbolic link

Parameters:

path - the path of the symbolic link to create

target - the target of the symbolic link

Returns:

the path to the symbolic link

Throws:

IOException

Since:

4.2

readSymLink

public static String readSymLink(File path)
                          throws IOException

Read target path of the symlink.

Parameters:

path - a File object.

Returns:

target path of the symlink, or null if it is not a symbolic link

Throws:

IOException

Since:

3.0

createTempDir

public static File createTempDir(String prefix,
                                 String suffix,
                                 File dir)
                          throws IOException

Create a temporary directory.

Parameters:

prefix - prefix string

suffix - suffix string

dir - The parent dir, can be null to use system default temp dir.

Returns:

the temp dir created.

Throws:

IOException

Since:

3.4

relativizeNativePath

public static String relativizeNativePath(String base,
                                          String other)

Expresses other as a relative file path from base. File-separator and case sensitivity are based on the current file system. See also relativizePath(String, String, String, boolean).

Parameters:

base - Base path

other - Destination path

Returns:

Relative path from base to other

Since:

4.8

relativizeGitPath

public static String relativizeGitPath(String base,
                                       String other)

Expresses other as a relative file path from base. File-separator and case sensitivity are based on Git's internal representation of files (which matches Unix). See also relativizePath(String, String, String, boolean).

Parameters:

base - Base path

other - Destination path

Returns:

Relative path from base to other

Since:

4.8

relativizePath

public static String relativizePath(String base,
                                    String other,
                                    String dirSeparator,
                                    boolean caseSensitive)

Expresses other as a relative file path from base

For example, if called with the two following paths :

 base = "c:\\Users\\jdoe\\eclipse\\git\\project"
 other = "c:\\Users\\jdoe\\eclipse\\git\\another_project\\pom.xml"
 

This will return "..\\another_project\\pom.xml".

Note that this will return the empty String if base and other are equal.

Parameters:

base - The path against which other should be relativized. This will be assumed to denote the path to a folder and not a file.

other - The path that will be made relative to base.

dirSeparator - A string that separates components of the path. In practice, this is "/" or "\\".

caseSensitive - Whether to consider differently-cased directory names as distinct

Returns:

A relative path that, when resolved against base, will yield the original other.

Since:

4.8

isStaleFileHandle

public static boolean isStaleFileHandle(IOException ioe)

Determine if an IOException is a Stale NFS File Handle

Parameters:

ioe - an IOException object.

Returns:

a boolean true if the IOException is a Stale NFS FIle Handle

Since:

4.1

isStaleFileHandleInCausalChain

public static boolean isStaleFileHandleInCausalChain(Throwable throwable)

Determine if a throwable or a cause in its causal chain is a Stale NFS File Handle

Parameters:

throwable - a Throwable object.

Returns:

a boolean true if the throwable or a cause in its causal chain is a Stale NFS File Handle

Since:

4.7

setHidden

public static void setHidden(File file,
                             boolean hidden)
                      throws IOException

Set a file hidden (on Windows)

Parameters:

file - a File object.

hidden - a boolean.

Throws:

IOException

Since:

4.1

getLength

public static long getLength(File file)
                      throws IOException

Get file length

Parameters:

file - a File.

Returns:

length of the given file

Throws:

IOException

Since:

4.1

canExecute

public static boolean canExecute(File file)

Whether the given file can be executed.

Parameters:

file - a File object.

Returns:

true if the given file can be executed.

Since:

4.1

getFileAttributesPosix

public static FS.Attributes getFileAttributesPosix(FS fs,
                                                   File file)

Get file system attributes for the given file.

Parameters:

fs - a FS object.

file - a File.

Returns:

file system attributes for the given file.

Since:

4.1

normalize

public static File normalize(File file)

NFC normalize a file (on Mac), otherwise do nothing

Parameters:

file - a File.

Returns:

on Mac: NFC normalized File, otherwise the passed file

Since:

4.1

normalize

public static String normalize(String name)

On Mac: get NFC normalized form of given name, otherwise the given name.

Parameters:

name - a String object.

Returns:

on Mac: NFC normalized form of given name

Since:

4.1

canonicalize

public static File canonicalize(File file)

Best-effort variation of File.getCanonicalFile() returning the input file if the file cannot be canonicalized instead of throwing IOException.

Parameters:

file - to be canonicalized; may be null

Returns:

canonicalized file, or the unchanged input file if canonicalization failed or if file == null

Throws:

SecurityException - if File.getCanonicalFile() throws one

Since:

4.2

pathToString

public static String pathToString(File file)

Convert a path to String, replacing separators as necessary.

Parameters:

file - a File.

Returns:

file's path as a String

Since:

4.10

touch

public static void touch(Path f)
                  throws IOException

Touch the given file

Parameters:

f - the file to touch

Throws:

IOException

Since:

5.1.8

delay

public static long delay(long last,
                         long min,
                         long max)

Compute a delay in a min..max interval with random jitter.

Parameters:

last - amount of delay waited before the last attempt. This is used to seed the next delay interval. Should be 0 if there was no prior delay.

min - shortest amount of allowable delay between attempts.

max - longest amount of allowable delay between attempts.

Returns:

new amount of delay to wait before the next attempt.

Since:

5.6