Package com.scurrilous.circe.impl

Class IncrementalIntStatefulHash

java.lang.Object

com.scurrilous.circe.impl.AbstractStatefulHash

com.scurrilous.circe.impl.IncrementalIntStatefulHash

All Implemented Interfaces:

Hash, StatefulHash, StatefulIntHash

class IncrementalIntStatefulHash
extends AbstractStatefulHash
implements StatefulIntHash

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	current
(package private) AbstractIncrementalIntHash	stateless

Constructor Summary

Constructors

Constructor	Description
IncrementalIntStatefulHash(AbstractIncrementalIntHash stateless)

Method Summary

Modifier and Type	Method	Description
java.lang.String	algorithm()	Returns the canonical name of this hash algorithm.
StatelessIntHash	asStateless()	Returns an instance of stateless version of this hash function.
StatefulHash	createNew()	Returns a new instance of this stateful hash function reset to the initial state.
int	getInt()	Returns the first four bytes of the output of this hash function as a little-endian int.
long	getLong()	Returns the first eight bytes of the output of this hash function as a little-endian long.
int	length()	Returns the length in bytes of the output of this hash function.
void	reset()	Resets this hash function to its initial state.
boolean	supportsIncremental()	Returns whether this hash function supports incremental hashing.
boolean	supportsUnsafe()	Returns whether this hash function supports unsafe access to arbitrary memory addresses using methods such as StatefulHash.update(long, long), StatelessIntHash.calculate(long, long), or IncrementalIntHash.resume(int, long, long).
void	update(long address, long length)	Updates the state of this hash function with memory with the given address and length.
void	update(java.nio.ByteBuffer input)	Updates the state of this hash function with the remaining contents of the given input buffer.
protected void	updateUnchecked(byte[] input, int index, int length)	Updates the state of this hash function with the given range of the given input array.

Methods inherited from class com.scurrilous.circe.impl.AbstractStatefulHash

getByte, getBytes, getBytes, getShort, update, update, writeBytes

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.scurrilous.circe.StatefulHash

getByte, getBytes, getBytes, getShort, update, update

Field Detail

stateless

final AbstractIncrementalIntHash stateless

current

int current

Constructor Detail

IncrementalIntStatefulHash

IncrementalIntStatefulHash(AbstractIncrementalIntHash stateless)

Method Detail

asStateless

public StatelessIntHash asStateless()

Description copied from interface: StatefulIntHash

Returns an instance of stateless version of this hash function.

Specified by:

asStateless in interface StatefulIntHash

Returns:

the stateless version of this hash function

algorithm

public java.lang.String algorithm()

Description copied from interface: Hash

Returns the canonical name of this hash algorithm.

Specified by:

algorithm in interface Hash

Returns:

the name of this hash algorithm

length

public int length()

Description copied from interface: Hash

Returns the length in bytes of the output of this hash function.

Specified by:

length in interface Hash

Returns:

the hash length in bytes

supportsUnsafe

public boolean supportsUnsafe()

Description copied from interface: Hash

Returns whether this hash function supports unsafe access to arbitrary memory addresses using methods such as StatefulHash.update(long, long), StatelessIntHash.calculate(long, long), or IncrementalIntHash.resume(int, long, long). Such functions are generally implemented in native code.

Specified by:

supportsUnsafe in interface Hash

Overrides:

supportsUnsafe in class AbstractStatefulHash

Returns:

true if unsafe access is supported, false if not

createNew

public StatefulHash createNew()

Description copied from interface: StatefulHash

Returns a new instance of this stateful hash function reset to the initial state.

Specified by:

createNew in interface StatefulHash

Returns:

a new instance of this hash in the initial state

supportsIncremental

public boolean supportsIncremental()

Description copied from interface: StatefulHash

Returns whether this hash function supports incremental hashing. Incremental hashing allows calling the StatefulHash.update(byte[]) methods to continue hashing using accumulated state after calling any of the output methods (such as StatefulHash.getBytes()). Non-incremental hash functions require calling StatefulHash.reset() to reinitialize the state between calling an output method and an update method.

Specified by:

supportsIncremental in interface StatefulHash

Returns:

true if incremental hashing is supported, false if not

reset

public void reset()

Description copied from interface: StatefulHash

Resets this hash function to its initial state. Resetting the state is required for non-incremental hash functions after any output methods have been called.

Specified by:

reset in interface StatefulHash

update

public void update(java.nio.ByteBuffer input)

Description copied from interface: StatefulHash

Updates the state of this hash function with the remaining contents of the given input buffer. This method leaves the buffer position at the limit.

Specified by:

update in interface StatefulHash

Overrides:

update in class AbstractStatefulHash

Parameters:

input - the input buffer

update

public void update(long address,
                   long length)

Description copied from interface: StatefulHash

Updates the state of this hash function with memory with the given address and length. The arguments are generally not checked in any way and will likely lead to a VM crash or undefined results if invalid.

Specified by:

update in interface StatefulHash

Overrides:

update in class AbstractStatefulHash

Parameters:

address - the base address of the input

length - the length of the input

See Also:

Hash.supportsUnsafe()

updateUnchecked

protected void updateUnchecked(byte[] input,
                               int index,
                               int length)

Description copied from class: AbstractStatefulHash

Updates the state of this hash function with the given range of the given input array. The index and length parameters have already been validated.

Specified by:

updateUnchecked in class AbstractStatefulHash

Parameters:

input - the input array

index - the starting index of the first input byte

length - the length of the input range

getInt

public int getInt()

Description copied from interface: StatefulHash

Returns the first four bytes of the output of this hash function as a little-endian int. If the output is less than four bytes, the remaining bytes are set to 0.

Specified by:

getInt in interface StatefulHash

Returns:

the first four output bytes as an int

getLong

public long getLong()

Description copied from interface: StatefulHash

Returns the first eight bytes of the output of this hash function as a little-endian long. If the output is less than eight bytes, the remaining bytes are set to 0.

Specified by:

getLong in interface StatefulHash

Returns:

the first eight output bytes as a long