com.jn.langx.util.hash.streaming

类 AdvancedStreamingHasher

java.lang.Object

com.jn.langx.util.hash.AbstractHasher

com.jn.langx.util.hash.streaming.AbstractStreamingHasher

com.jn.langx.util.hash.streaming.AdvancedStreamingHasher

所有已实现的接口:

Factory<Object,Hasher>, Named, Supplier<Object,Hasher>, Hasher, StreamingHasher

直接已知子类:

Murmur3_128Hasher

public abstract class AdvancedStreamingHasher
extends AbstractStreamingHasher

A convenience base class for implementors of Hasher; handles accumulating data until an entire "chunk" (of implementation-dependent length) is ready to be hashed.

从以下版本开始:

4.4.0

字段概要

从类继承的字段 com.jn.langx.util.hash.AbstractHasher

seed

构造器概要

构造器

限定符	构造器和说明
protected	AdvancedStreamingHasher(int chunkSize) Constructor for use by subclasses.
protected	AdvancedStreamingHasher(int chunkSize, int bufferSize) Constructor for use by subclasses.

方法概要

限定符和类型	方法和说明
protected long	doFinal()
long	getHash()
protected abstract long	makeHash() Computes a hash code based on the data that have been provided to this hasher.
protected abstract void	process(ByteBuffer bb) Processes the available bytes of the buffer (at most chunk bytes).
protected void	processRemaining(ByteBuffer bb) This is invoked for the last bytes of the input, which are not enough to fill a whole chunk.
protected AdvancedStreamingHasher	putBytes(byte[] bytes, int off, int len)
void	update(byte[] bytes, int off, int len) 用于流式计算

从类继承的方法 com.jn.langx.util.hash.streaming.AbstractStreamingHasher

asInt, asLong, hash, padToLong, reset, toLong, update

从类继承的方法 com.jn.langx.util.hash.AbstractHasher

createInstance, get, getName, hash, hash, setSeed

从类继承的方法 java.lang.Object

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

从接口继承的方法 com.jn.langx.util.hash.StreamingHasher

setSeed

从接口继承的方法 com.jn.langx.util.hash.Hasher

get, getName, hash, hash

构造器详细资料

AdvancedStreamingHasher

protected AdvancedStreamingHasher(int chunkSize)

Constructor for use by subclasses. This hasher instance will process chunks of the specified size.

参数:

chunkSize - the number of bytes available per process(ByteBuffer) invocation; must be at least 4

AdvancedStreamingHasher

protected AdvancedStreamingHasher(int chunkSize,
                                  int bufferSize)

Constructor for use by subclasses. This hasher instance will process chunks of the specified size, using an internal buffer of bufferSize size, which must be a multiple of chunkSize.

参数:

chunkSize - the number of bytes available per process(ByteBuffer) invocation; must be at least 4

bufferSize - the size of the internal buffer. Must be a multiple of chunkSize

方法详细资料

process

protected abstract void process(ByteBuffer bb)

Processes the available bytes of the buffer (at most chunk bytes).

processRemaining

protected void processRemaining(ByteBuffer bb)

This is invoked for the last bytes of the input, which are not enough to fill a whole chunk. The passed ByteBuffer is guaranteed to be non-empty.

This implementation simply pads with zeros and delegates to process(ByteBuffer).

update

public void update(byte[] bytes,
                   int off,
                   int len)

从类复制的说明: AbstractStreamingHasher

用于流式计算

指定者:

update 在接口中 StreamingHasher

覆盖:

update 在类中 AbstractStreamingHasher

getHash

public long getHash()

putBytes

protected final AdvancedStreamingHasher putBytes(byte[] bytes,
                                                 int off,
                                                 int len)

doFinal

protected final long doFinal()

makeHash

protected abstract long makeHash()

Computes a hash code based on the data that have been provided to this hasher. This is called after all chunks are handled with process(java.nio.ByteBuffer) and any leftover bytes that did not make a complete chunk are handled with processRemaining(java.nio.ByteBuffer).