org.apache.commons.compress.archivers.sevenz

Enum SevenZMethod

java.lang.Object

java.lang.Enum<SevenZMethod>

org.apache.commons.compress.archivers.sevenz.SevenZMethod

All Implemented Interfaces:

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

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

The (partially) supported compression/encryption methods used in 7z archives.

All methods with a _FILTER suffix are used as preprocessors with the goal of creating a better compression ratio with the compressor that comes next in the chain of methods. 7z will in general only allow them to be used together with a "real" compression method but Commons Compress doesn't enforce this.

The BCJ_ filters work on executable files for the given platform and convert relative addresses to absolute addresses in CALL instructions. This means they are only useful when applied to executables of the chosen platform.

Enum Constant Summary

Enum Constants

Enum Constant and Description
AES256SHA256 AES encryption with a key length of 256 bit using SHA256 for hashes - only supported when reading
BCJ_ARM_FILTER BCJ ARM platform.
BCJ_ARM_THUMB_FILTER BCJ ARM Thumb platform.
BCJ_IA64_FILTER BCJ I64 platform.
BCJ_PPC_FILTER BCJ PowerPC platform.
BCJ_SPARC_FILTER BCJ Sparc platform.
BCJ_X86_FILTER BCJ x86 platform version 1.
BZIP2 BZIP2
COPY no compression at all
DEFLATE Deflate
DEFLATE64 Deflate64
DELTA_FILTER Delta filter.
LZMA LZMA - only supported when reading
LZMA2 LZMA2

Method Summary

Modifier and Type	Method and Description
static SevenZMethod	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static SevenZMethod[]	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

COPY

public static final SevenZMethod COPY

no compression at all

LZMA

public static final SevenZMethod LZMA

LZMA - only supported when reading

LZMA2

public static final SevenZMethod LZMA2

LZMA2

DEFLATE

public static final SevenZMethod DEFLATE

Deflate

DEFLATE64

public static final SevenZMethod DEFLATE64

Deflate64

Since:

1.16

BZIP2

public static final SevenZMethod BZIP2

BZIP2

AES256SHA256

public static final SevenZMethod AES256SHA256

AES encryption with a key length of 256 bit using SHA256 for hashes - only supported when reading

BCJ_X86_FILTER

public static final SevenZMethod BCJ_X86_FILTER

BCJ x86 platform version 1.

Since:

1.8

BCJ_PPC_FILTER

public static final SevenZMethod BCJ_PPC_FILTER

BCJ PowerPC platform.

Since:

1.8

BCJ_IA64_FILTER

public static final SevenZMethod BCJ_IA64_FILTER

BCJ I64 platform.

Since:

1.8

BCJ_ARM_FILTER

public static final SevenZMethod BCJ_ARM_FILTER

BCJ ARM platform.

Since:

1.8

BCJ_ARM_THUMB_FILTER

public static final SevenZMethod BCJ_ARM_THUMB_FILTER

BCJ ARM Thumb platform.

Since:

1.8

BCJ_SPARC_FILTER

public static final SevenZMethod BCJ_SPARC_FILTER

BCJ Sparc platform.

Since:

1.8

DELTA_FILTER

public static final SevenZMethod DELTA_FILTER

Delta filter.

Since:

1.8

Method Detail

values

public static SevenZMethod[] 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 (SevenZMethod c : SevenZMethod.values())
    System.out.println(c);

Returns:

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

valueOf

public static SevenZMethod 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