public class Prime64Hash extends AbstractHashFunction
Modifier and Type | Field and Description |
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protected static byte[] |
DEFAULT_SEED
Default seed, the first seed from the SHA-2 512-bit hash.
|
static int |
LENGTH
Length of the hash is 64 bits (8 bytes), 8.
|
Constructor and Description |
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Prime64Hash()
Creates a new instance of Prime64Hash
|
Modifier and Type | Method and Description |
---|---|
Prime64Hash |
clone()
This makes public the clone method on the
Object class and
removes the exception that it throws. |
void |
evaluateInto(byte[] input,
byte[] output,
byte[] seed)
Evaluates the input into the given output
|
byte[] |
getDefaultSeed()
Gets the default seed for the hash function
|
static long |
hash(byte[] input)
Computes the prime-number hash of the given input, prime number, and seed
|
static long |
hash(byte[] input,
long seed)
Computes the prime-number hash of the given input, prime number, and seed
|
static long |
hash(byte[] input,
long prime,
long seed)
Computes the prime-number hash of the given input, prime number, and seed
|
int |
length()
Returns the number of bytes in the output hash code.
|
evaluate, evaluate, evaluateInto
public static final int LENGTH
protected static final byte[] DEFAULT_SEED
public Prime64Hash clone()
AbstractCloneableSerializable
Object
class and
removes the exception that it throws. Its default behavior is to
automatically create a clone of the exact type of object that the
clone is called on and to copy all primitives but to keep all references,
which means it is a shallow copy.
Extensions of this class may want to override this method (but call
super.clone()
to implement a "smart copy". That is, to target
the most common use case for creating a copy of the object. Because of
the default behavior being a shallow copy, extending classes only need
to handle fields that need to have a deeper copy (or those that need to
be reset). Some of the methods in ObjectUtil
may be helpful in
implementing a custom clone method.
Note: The contract of this method is that you must use
super.clone()
as the basis for your implementation.clone
in interface CloneableSerializable
clone
in class AbstractHashFunction
public int length()
HashFunction
public byte[] getDefaultSeed()
HashFunction
public void evaluateInto(byte[] input, byte[] output, byte[] seed)
HashFunction
input
- Input to compute the hash-function value ofoutput
- Output to put the hash-function intoseed
- Seed to offset the hash code.public static long hash(byte[] input)
input
- Input to hashpublic static long hash(byte[] input, long seed)
input
- Input to hashseed
- Seed to start the hash processpublic static long hash(byte[] input, long prime, long seed)
input
- Input to hashprime
- Prime number to recursively multiply the inputseed
- Seed to start the hash process