org.apache.commons.io

Enum FileSystem

java.lang.Object

java.lang.Enum<FileSystem>

org.apache.commons.io.FileSystem

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<FileSystem>

public enum FileSystem
extends java.lang.Enum<FileSystem>

Abstracts an OS' file system details, currently supporting the single use case of converting a file name String to a legal file name with toLegalFileName(String, char).

The starting point of any operation is getCurrent() which gets you the enum for the file system that matches the OS hosting the running JVM.

Since:

2.7

Enum Constant Summary

Enum Constants

Enum Constant and Description
GENERIC Generic file system.
LINUX Linux file system.
MAC_OSX MacOS file system.
WINDOWS Windows file system.

Method Summary

Modifier and Type	Method and Description
int	getBlockSize() Gets the file allocation block size in bytes.
static FileSystem	getCurrent() Gets the current file system.
char[]	getIllegalFileNameChars() Gets a cloned copy of the illegal characters for this file system.
int[]	getIllegalFileNameCodePoints() Gets a cloned copy of the illegal code points for this file system.
int	getMaxFileNameLength() Gets the maximum length for file names.
int	getMaxPathLength() Gets the maximum length of the path to a file.
char	getNameSeparator() Gets the name separator, '\\' on Windows, '/' on Linux.
java.lang.String[]	getReservedFileNames() Gets a cloned copy of the reserved file names.
boolean	isCasePreserving() Tests whether this file system preserves case.
boolean	isCaseSensitive() Tests whether this file system is case-sensitive.
boolean	isLegalFileName(java.lang.CharSequence candidate) Tests if a candidate file name (without a path) such as "filename.ext" or "filename" is a potentially legal file name.
boolean	isReservedFileName(java.lang.CharSequence candidate) Tests whether the given string is a reserved file name.
java.lang.String	normalizeSeparators(java.lang.String path) Converts all separators to the Windows separator of backslash.
boolean	supportsDriveLetter() Tests whether this file system support driver letters.
java.lang.String	toLegalFileName(java.lang.String candidate, char replacement) Converts a candidate file name (without a path) like "filename.ext" or "filename" to a legal file name.
static FileSystem	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static FileSystem[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

GENERIC

public static final FileSystem GENERIC

Generic file system.

LINUX

public static final FileSystem LINUX

Linux file system.

MAC_OSX

public static final FileSystem MAC_OSX

MacOS file system.

WINDOWS

public static final FileSystem WINDOWS

Windows file system.

The reserved characters are defined in the Naming Conventions (microsoft.com).

See Also:

Naming Conventions (microsoft.com), CreateFileA function - Consoles (microsoft.com)

Method Detail

values

public static FileSystem[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (FileSystem c : FileSystem.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static FileSystem valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

getCurrent

public static FileSystem getCurrent()

Gets the current file system.

Returns:

the current file system

getBlockSize

public int getBlockSize()

Gets the file allocation block size in bytes.

Returns:

the file allocation block size in bytes.

Since:

2.12.0

getIllegalFileNameChars

public char[] getIllegalFileNameChars()

Gets a cloned copy of the illegal characters for this file system.

Returns:

the illegal characters for this file system.

getIllegalFileNameCodePoints

public int[] getIllegalFileNameCodePoints()

Gets a cloned copy of the illegal code points for this file system.

Returns:

the illegal code points for this file system.

Since:

2.12.0

getMaxFileNameLength

public int getMaxFileNameLength()

Gets the maximum length for file names. The file name does not include folders.

Returns:

the maximum length for file names.

getMaxPathLength

public int getMaxPathLength()

Gets the maximum length of the path to a file. This can include folders.

Returns:

the maximum length of the path to a file.

getNameSeparator

public char getNameSeparator()

Gets the name separator, '\\' on Windows, '/' on Linux.

Returns:

'\\' on Windows, '/' on Linux.

Since:

2.12.0

getReservedFileNames

public java.lang.String[] getReservedFileNames()

Gets a cloned copy of the reserved file names.

Returns:

the reserved file names.

isCasePreserving

public boolean isCasePreserving()

Tests whether this file system preserves case.

Returns:

Whether this file system preserves case.

isCaseSensitive

public boolean isCaseSensitive()

Tests whether this file system is case-sensitive.

Returns:

Whether this file system is case-sensitive.

isLegalFileName

public boolean isLegalFileName(java.lang.CharSequence candidate)

Tests if a candidate file name (without a path) such as "filename.ext" or "filename" is a potentially legal file name. If the file name length exceeds getMaxFileNameLength(), or if it contains an illegal character then the check fails.

Parameters:

candidate - a candidate file name (without a path) like "filename.ext" or "filename"

Returns:

true if the candidate name is legal

isReservedFileName

public boolean isReservedFileName(java.lang.CharSequence candidate)

Tests whether the given string is a reserved file name.

Parameters:

candidate - the string to test

Returns:

true if the given string is a reserved file name.

normalizeSeparators

public java.lang.String normalizeSeparators(java.lang.String path)

Converts all separators to the Windows separator of backslash.

Parameters:

path - the path to be changed, null ignored

Returns:

the updated path

Since:

2.12.0

supportsDriveLetter

public boolean supportsDriveLetter()

Tests whether this file system support driver letters.

Windows supports driver letters as do other operating systems. Whether these other OS's still support Java like OS/2, is a different matter.

Returns:

whether this file system support driver letters.

Since:

2.9.0

See Also:

Operating systems that use drive letter assignment

toLegalFileName

public java.lang.String toLegalFileName(java.lang.String candidate,
                                        char replacement)

Converts a candidate file name (without a path) like "filename.ext" or "filename" to a legal file name. Illegal characters in the candidate name are replaced by the replacement character. If the file name length exceeds getMaxFileNameLength(), then the name is truncated to getMaxFileNameLength().

Parameters:

candidate - a candidate file name (without a path) like "filename.ext" or "filename"

replacement - Illegal characters in the candidate name are replaced by this character

Returns:

a String without illegal characters