org.apache.avro.file

Class CodecFactory

java.lang.Object

org.apache.avro.file.CodecFactory

public abstract class CodecFactory
extends Object

Encapsulates the ability to specify and configure a compression codec. Currently there are three codecs registered by default:

• null
• deflate
• snappy
• bzip2

New and custom codecs can be registered using addCodec(String, CodecFactory).

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_DEFLATE_LEVEL
static int	DEFAULT_XZ_LEVEL
static int	DEFAULT_ZSTANDARD_LEVEL

Constructor Summary

Constructors

Constructor and Description
CodecFactory()

Method Summary

Modifier and Type	Method and Description
static CodecFactory	addCodec(String name, CodecFactory c) Adds a new codec implementation.
static CodecFactory	bzip2Codec() bzip2 codec.
protected abstract Codec	createInstance() Creates internal Codec.
static CodecFactory	deflateCodec(int compressionLevel) Deflate codec, with specific compression.
static CodecFactory	fromString(String s) Maps a codec name into a CodecFactory.
static CodecFactory	nullCodec() Null codec, for no compression.
static CodecFactory	snappyCodec() Snappy codec.
String	toString()
static CodecFactory	xzCodec(int compressionLevel) XZ codec, with specific compression.
static CodecFactory	zstandardCodec(int level) zstandard codec, with specific compression level.
static CodecFactory	zstandardCodec(int level, boolean useChecksum) zstandard codec, with specific compression level.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_DEFLATE_LEVEL

public static final int DEFAULT_DEFLATE_LEVEL

See Also:

Constant Field Values

DEFAULT_XZ_LEVEL

public static final int DEFAULT_XZ_LEVEL

See Also:

Constant Field Values

DEFAULT_ZSTANDARD_LEVEL

public static final int DEFAULT_ZSTANDARD_LEVEL

See Also:

Constant Field Values

Constructor Detail

CodecFactory

public CodecFactory()

Method Detail

nullCodec

public static CodecFactory nullCodec()

Null codec, for no compression.

deflateCodec

public static CodecFactory deflateCodec(int compressionLevel)

Deflate codec, with specific compression. compressionLevel should be between 1 and 9, inclusive.

xzCodec

public static CodecFactory xzCodec(int compressionLevel)

XZ codec, with specific compression. compressionLevel should be between 1 and 9, inclusive.

snappyCodec

public static CodecFactory snappyCodec()

Snappy codec.

bzip2Codec

public static CodecFactory bzip2Codec()

bzip2 codec.

zstandardCodec

public static CodecFactory zstandardCodec(int level)

zstandard codec, with specific compression level.

Parameters:

level - The compression level should be between -5 and 22, inclusive. Negative levels are 'fast' modes akin to lz4 or snappy, levels above 9 are generally for archival purposes, and levels above 18 use a lot of memory.

zstandardCodec

public static CodecFactory zstandardCodec(int level,
                                          boolean useChecksum)

zstandard codec, with specific compression level.

Parameters:

level - The compression level should be between -5 and 22, inclusive. Negative levels are 'fast' modes akin to lz4 or snappy, levels above 9 are generally for archival purposes, and levels above 18 use a lot of memory.

useChecksum - if true, will include a checksum with each data block

createInstance

protected abstract Codec createInstance()

Creates internal Codec.

fromString

public static CodecFactory fromString(String s)

Maps a codec name into a CodecFactory. Currently there are six codecs registered by default:

• null
• deflate
• snappy
• bzip2
• xz
• zstandard

addCodec

public static CodecFactory addCodec(String name,
                                    CodecFactory c)

Adds a new codec implementation. If name already had a codec associated with it, returns the previous codec.

toString

public String toString()

Overrides:

toString in class Object