Package org.apache.hadoop.io.compress.zlib

Class ZlibFactory

java.lang.Object

org.apache.hadoop.io.compress.zlib.ZlibFactory

public class ZlibFactory
extends java.lang.Object

A collection of factories to create the right zlib/gzip compressor/decompressor instances.

Constructor Summary

Constructors

Constructor	Description
ZlibFactory()

Method Summary

Modifier and Type	Method	Description
static ZlibCompressor.CompressionLevel	getCompressionLevel(Configuration conf)
static ZlibCompressor.CompressionStrategy	getCompressionStrategy(Configuration conf)
static java.lang.String	getLibraryName()
static Compressor	getZlibCompressor(Configuration conf)	Return the appropriate implementation of the zlib compressor.
static java.lang.Class<? extends Compressor>	getZlibCompressorType(Configuration conf)	Return the appropriate type of the zlib compressor.
static Decompressor	getZlibDecompressor(Configuration conf)	Return the appropriate implementation of the zlib decompressor.
static java.lang.Class<? extends Decompressor>	getZlibDecompressorType(Configuration conf)	Return the appropriate type of the zlib decompressor.
static DirectDecompressor	getZlibDirectDecompressor(Configuration conf)	Return the appropriate implementation of the zlib direct decompressor.
static boolean	isNativeZlibLoaded(Configuration conf)	Check if native-zlib code is loaded & initialized correctly and can be loaded for this job.
static void	loadNativeZLib()	Load native library and set the flag whether to use native library.
static void	setCompressionLevel(Configuration conf, ZlibCompressor.CompressionLevel level)
static void	setCompressionStrategy(Configuration conf, ZlibCompressor.CompressionStrategy strategy)
static void	setNativeZlibLoaded(boolean isLoaded)	Set the flag whether to use native library.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZlibFactory

public ZlibFactory()

Method Detail

loadNativeZLib

@VisibleForTesting
public static void loadNativeZLib()

Load native library and set the flag whether to use native library. The method is also used for reset the flag modified by setNativeZlibLoaded

setNativeZlibLoaded

@VisibleForTesting
public static void setNativeZlibLoaded(boolean isLoaded)

Set the flag whether to use native library. Used for testing non-native libraries

Parameters:

isLoaded - isLoaded.

isNativeZlibLoaded

public static boolean isNativeZlibLoaded(Configuration conf)

Check if native-zlib code is loaded & initialized correctly and can be loaded for this job.

Parameters:

conf - configuration

Returns:

true if native-zlib is loaded & initialized and can be loaded for this job, else false

getLibraryName

public static java.lang.String getLibraryName()

getZlibCompressorType

public static java.lang.Class<? extends Compressor> getZlibCompressorType(Configuration conf)

Return the appropriate type of the zlib compressor.

Parameters:

conf - configuration

Returns:

the appropriate type of the zlib compressor.

getZlibCompressor

public static Compressor getZlibCompressor(Configuration conf)

Return the appropriate implementation of the zlib compressor.

Parameters:

conf - configuration

Returns:

the appropriate implementation of the zlib compressor.

getZlibDecompressorType

public static java.lang.Class<? extends Decompressor> getZlibDecompressorType(Configuration conf)

Return the appropriate type of the zlib decompressor.

Parameters:

conf - configuration

Returns:

the appropriate type of the zlib decompressor.

getZlibDecompressor

public static Decompressor getZlibDecompressor(Configuration conf)

Return the appropriate implementation of the zlib decompressor.

Parameters:

conf - configuration

Returns:

the appropriate implementation of the zlib decompressor.

getZlibDirectDecompressor

public static DirectDecompressor getZlibDirectDecompressor(Configuration conf)

Return the appropriate implementation of the zlib direct decompressor.

Parameters:

conf - configuration

Returns:

the appropriate implementation of the zlib decompressor.

setCompressionStrategy

public static void setCompressionStrategy(Configuration conf,
                                          ZlibCompressor.CompressionStrategy strategy)

getCompressionStrategy

public static ZlibCompressor.CompressionStrategy getCompressionStrategy(Configuration conf)

setCompressionLevel

public static void setCompressionLevel(Configuration conf,
                                       ZlibCompressor.CompressionLevel level)

getCompressionLevel

public static ZlibCompressor.CompressionLevel getCompressionLevel(Configuration conf)