org.apache.commons.compress.compressors.xz

Class XZUtils

java.lang.Object

org.apache.commons.compress.compressors.xz.XZUtils

public class XZUtils
extends java.lang.Object

Utility code for the xz compression format.

Since:

1.4

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 xz.
static java.lang.String	getUncompressedFilename(java.lang.String filename) Maps the given name of a xz-compressed file to the name that the file should have after uncompression.
static boolean	isCompressedFilename(java.lang.String filename) Detects common xz suffixes in the given filename.
static boolean	isXZCompressionAvailable() Are the classes required to support XZ compression available?
static boolean	matches(byte[] signature, int length) Checks if the signature matches what is expected for a .xz file.
static void	setCacheXZAvailablity(boolean doCache) Whether to cache the result of the XZ for Java 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 .xz file.

This is more or less a copy of the version found in XZCompressorInputStream but doesn't depend on the presence of XZ for Java.

Parameters:

signature - the bytes to check

length - the number of bytes to check

Returns:

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

Since:

1.9

isXZCompressionAvailable

public static boolean isXZCompressionAvailable()

Are the classes required to support XZ compression available?

Returns:

true if the classes required to support XZ compression are available

Since:

1.5

isCompressedFilename

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

Detects common xz suffixes in the given filename.

Parameters:

filename - name of a file

Returns:

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

getUncompressedFilename

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

Maps the given name of a xz-compressed file to the name that the file should have after uncompression. Commonly used file type specific suffixes like ".txz" are automatically detected and correctly mapped. For example the name "package.txz" is mapped to "package.tar". And any filenames with the generic ".xz" suffix (or any other generic xz suffix) is mapped to a name without that suffix. If no xz 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 xz. Common file types with custom suffixes for compressed versions are automatically detected and correctly mapped. For example the name "package.tar" is mapped to "package.txz". If no custom mapping is applicable, then the default ".xz" suffix is appended to the filename.

Parameters:

filename - name of a file

Returns:

name of the corresponding compressed file

setCacheXZAvailablity

public static void setCacheXZAvailablity(boolean doCache)

Whether to cache the result of the XZ for Java check.

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

Parameters:

doCache - whether to cache the result

Since:

1.9