org.apache.orc.impl

类 ZstdCodec

java.lang.Object

org.apache.orc.impl.ZstdCodec

所有已实现的接口:

Closeable, AutoCloseable, org.apache.orc.CompressionCodec, org.apache.orc.impl.DirectDecompressionCodec

public class ZstdCodec
extends Object
implements org.apache.orc.CompressionCodec, org.apache.orc.impl.DirectDecompressionCodec

orc ZstdCodec.

NOTE: The file was copied and modified to support zstd-jni. This feature is only supported in ORC 2.0, but 2.0 only supports JDK17. We need to support JDK8.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.orc.CompressionCodec

org.apache.orc.CompressionCodec.DataKind, org.apache.orc.CompressionCodec.Options, org.apache.orc.CompressionCodec.SpeedModifier

构造器概要

构造器

构造器和说明
ZstdCodec()
ZstdCodec(int level, int windowLog)

方法概要

限定符和类型	方法和说明
void	close()
boolean	compress(ByteBuffer in, ByteBuffer out, ByteBuffer overflow, org.apache.orc.CompressionCodec.Options options) Compresses an input ByteBuffer into an output ByteBuffer using Zstandard compression.
void	decompress(ByteBuffer in, ByteBuffer out)
void	destroy()
void	directDecompress(ByteBuffer in, ByteBuffer out)
protected static byte[]	getBuffer(int size)
org.apache.orc.CompressionCodec.Options	getDefaultOptions()
CompressionKind	getKind()
org.apache.orc.impl.ZstdCodec.ZstdOptions	getZstdOptions()
boolean	isAvailable()
void	reset()

从类继承的方法 java.lang.Object

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

构造器详细资料

ZstdCodec

public ZstdCodec(int level,
                 int windowLog)

ZstdCodec

public ZstdCodec()

方法详细资料

getZstdOptions

public org.apache.orc.impl.ZstdCodec.ZstdOptions getZstdOptions()

getBuffer

protected static byte[] getBuffer(int size)

getDefaultOptions

public org.apache.orc.CompressionCodec.Options getDefaultOptions()

指定者:

getDefaultOptions 在接口中 org.apache.orc.CompressionCodec

compress

public boolean compress(ByteBuffer in,
                        ByteBuffer out,
                        ByteBuffer overflow,
                        org.apache.orc.CompressionCodec.Options options)
                 throws IOException

Compresses an input ByteBuffer into an output ByteBuffer using Zstandard compression. If the maximum bound of the number of output bytes exceeds the output ByteBuffer size, the remaining bytes are written to the overflow ByteBuffer.

指定者:

compress 在接口中 org.apache.orc.CompressionCodec

参数:

in - the bytes to compress

out - the compressed bytes

overflow - put any additional bytes here

options - the options to control compression

返回:

ZstdOptions

抛出:

IOException

decompress

public void decompress(ByteBuffer in,
                       ByteBuffer out)
                throws IOException

指定者:

decompress 在接口中 org.apache.orc.CompressionCodec

抛出:

IOException

isAvailable

public boolean isAvailable()

指定者:

isAvailable 在接口中 org.apache.orc.impl.DirectDecompressionCodec

directDecompress

public void directDecompress(ByteBuffer in,
                             ByteBuffer out)
                      throws IOException

指定者:

directDecompress 在接口中 org.apache.orc.impl.DirectDecompressionCodec

抛出:

IOException

reset

public void reset()

指定者:

reset 在接口中 org.apache.orc.CompressionCodec

destroy

public void destroy()

指定者:

destroy 在接口中 org.apache.orc.CompressionCodec

getKind

public CompressionKind getKind()

指定者:

getKind 在接口中 org.apache.orc.CompressionCodec

close

public void close()

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 org.apache.orc.CompressionCodec