net.jpountz.xxhash

Class StreamingXXHash64

java.lang.Object

net.jpountz.xxhash.StreamingXXHash64

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public abstract class StreamingXXHash64
extends java.lang.Object
implements java.io.Closeable

Streaming interface for XXHash64.

This API is compatible with the block API and the following code samples are equivalent:

   long hash(XXHashFactory xxhashFactory, byte[] buf, int off, int len, long seed) {
     return xxhashFactory.hash64().hash(buf, off, len, seed);
   }
 

   long hash(XXHashFactory xxhashFactory, byte[] buf, int off, int len, long seed) {
     StreamingXXHash64 sh64 = xxhashFactory.newStreamingHash64(seed);
     sh64.update(buf, off, len);
     return sh64.getValue();
   }
 

Instances of this class are not thread-safe.

Method Summary

Methods

Modifier and Type	Method and Description
java.util.zip.Checksum	asChecksum() Returns a Checksum view of this instance.
void	close() Releases any system resources associated with this instance.
abstract long	getValue() Returns the value of the checksum.
abstract void	reset() Resets this instance to the state it had right after instantiation.
java.lang.String	toString()
abstract void	update(byte[] buf, int off, int len) Updates the value of the hash with buf[off:off+len].

Methods inherited from class java.lang.Object

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

Method Detail

getValue

public abstract long getValue()

Returns the value of the checksum.

Returns:

the checksum

update

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

Updates the value of the hash with buf[off:off+len].

Parameters:

buf - the input data

off - the start offset in buf

len - the number of bytes to hash

reset

public abstract void reset()

Resets this instance to the state it had right after instantiation. The seed remains unchanged.

close

public void close()

Releases any system resources associated with this instance. It is not mandatory to call this method after using this instance because the system resources are released anyway when this instance is reclaimed by GC.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

asChecksum

public final java.util.zip.Checksum asChecksum()

Returns a Checksum view of this instance. Modifications to the view will modify this instance too and vice-versa.

Returns:

the Checksum object representing this instance