org.apache.commons.compress.compressors.lzma

Class LZMAUtils

java.lang.Object

org.apache.commons.compress.compressors.lzma.LZMAUtils

public class LZMAUtils
extends java.lang.Object

Utility code for the lzma compression format.

Since:

1.10

Method Summary

Modifier and Type	Method and Description
static java.lang.String	getCompressedFilename(java.lang.String filename) Maps the given filename to the name that the file should have after compression with lzma.
static java.lang.String	getUncompressedFilename(java.lang.String filename) Maps the given name of a lzma-compressed file to the name that the file should have after uncompression.
static boolean	isCompressedFilename(java.lang.String filename) Detects common lzma suffixes in the given filename.
static boolean	isLZMACompressionAvailable() Are the classes required to support LZMA compression available?
static boolean	matches(byte[] signature, int length) Checks if the signature matches what is expected for a .lzma file.
static void	setCacheLZMAAvailablity(boolean doCache) Whether to cache the result of the LZMA check.

Methods inherited from class java.lang.Object

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

Method Detail

matches

public static boolean matches(byte[] signature,
                              int length)

Checks if the signature matches what is expected for a .lzma file.

Parameters:

signature - the bytes to check

length - the number of bytes to check

Returns:

true if signature matches the .lzma magic bytes, false otherwise

isLZMACompressionAvailable

public static boolean isLZMACompressionAvailable()

Are the classes required to support LZMA compression available?

Returns:

true if the classes required to support LZMA compression are available

isCompressedFilename

public static boolean isCompressedFilename(java.lang.String filename)

Detects common lzma suffixes in the given filename.

Parameters:

filename - name of a file

Returns:

true if the filename has a common lzma suffix, false otherwise

getUncompressedFilename

public static java.lang.String getUncompressedFilename(java.lang.String filename)

Maps the given name of a lzma-compressed file to the name that the file should have after uncompression. Any filenames with the generic ".lzma" suffix (or any other generic lzma suffix) is mapped to a name without that suffix. If no lzma suffix is detected, then the filename is returned unmapped.

Parameters:

filename - name of a file

Returns:

name of the corresponding uncompressed file

getCompressedFilename

public static java.lang.String getCompressedFilename(java.lang.String filename)

Maps the given filename to the name that the file should have after compression with lzma.

Parameters:

filename - name of a file

Returns:

name of the corresponding compressed file

setCacheLZMAAvailablity

public static void setCacheLZMAAvailablity(boolean doCache)

Whether to cache the result of the LZMA check.

This defaults to false in an OSGi environment and true otherwise.

Parameters:

doCache - whether to cache the result