org.apache.hadoop.io.compress.zlib

类 BuiltInZlibDeflater

java.lang.Object

java.util.zip.Deflater

org.apache.hadoop.io.compress.zlib.BuiltInZlibDeflater

所有已实现的接口:

Compressor

public class BuiltInZlibDeflater
extends Deflater
implements Compressor

A wrapper around java.util.zip.Deflater to make it conform to org.apache.hadoop.io.compress.Compressor interface.

字段概要

从类继承的字段 java.util.zip.Deflater

BEST_COMPRESSION, BEST_SPEED, DEFAULT_COMPRESSION, DEFAULT_STRATEGY, DEFLATED, FILTERED, FULL_FLUSH, HUFFMAN_ONLY, NO_COMPRESSION, NO_FLUSH, SYNC_FLUSH

构造器概要

构造器

构造器和说明
BuiltInZlibDeflater()
BuiltInZlibDeflater(int level)
BuiltInZlibDeflater(int level, boolean nowrap)

方法概要

方法

限定符和类型	方法和说明
int	compress(byte[] b, int off, int len) Fills specified buffer with compressed data.
void	reinit(Configuration conf) reinit the compressor with the given configuration.

从类继承的方法 java.util.zip.Deflater

deflate, deflate, deflate, end, finalize, finish, finished, getAdler, getBytesRead, getBytesWritten, getTotalIn, getTotalOut, needsInput, reset, setDictionary, setDictionary, setInput, setInput, setLevel, setStrategy

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.io.compress.Compressor

end, finish, finished, getBytesRead, getBytesWritten, needsInput, reset, setDictionary, setInput

构造器详细资料

BuiltInZlibDeflater

public BuiltInZlibDeflater(int level,
                   boolean nowrap)

BuiltInZlibDeflater

public BuiltInZlibDeflater(int level)

BuiltInZlibDeflater

public BuiltInZlibDeflater()

方法详细资料

compress

public int compress(byte[] b,
           int off,
           int len)
             throws IOException

从接口复制的说明: Compressor

Fills specified buffer with compressed data. Returns actual number of bytes of compressed data. A return value of 0 indicates that needsInput() should be called in order to determine if more input data is required.

指定者:

compress 在接口中 Compressor

参数:

b - Buffer for the compressed data

off - Start offset of the data

len - Size of the buffer

返回:

The actual number of bytes of compressed data.

抛出:

IOException

reinit

public void reinit(Configuration conf)

reinit the compressor with the given configuration. It will reset the compressor's compression level and compression strategy. Different from ZlibCompressor, BuiltInZlibDeflater only support three kind of compression strategy: FILTERED, HUFFMAN_ONLY and DEFAULT_STRATEGY. It will use DEFAULT_STRATEGY as default if the configured compression strategy is not supported.

指定者:

reinit 在接口中 Compressor

参数:

conf - Configuration from which new setting are fetched