org.apfloat.internal

Class LongFactor3SixStepNTTStrategy

java.lang.Object

org.apfloat.internal.LongElementaryModMath

org.apfloat.internal.LongModMath

org.apfloat.internal.LongTableFNTStrategy

org.apfloat.internal.LongParallelFNTStrategy

org.apfloat.internal.LongFactor3SixStepNTTStrategy

All Implemented Interfaces:

ParallelNTTStrategy, NTTStrategy

public class LongFactor3SixStepNTTStrategy
extends LongParallelFNTStrategy

A transform that implements a 3-point transform on top of the six-step Number Theoretic Transform that does transforms of length 2ⁿ.

Version:

1.5.1

Author:

Mikko Tommila

Field Summary

Fields inherited from class org.apfloat.internal.LongParallelFNTStrategy

parallelRunner

Constructor Summary

Constructors

Constructor and Description
LongFactor3SixStepNTTStrategy(LongSixStepFNTStrategy factor2Strategy) Creates a new factor-3 transform strategy on top of a six-step transform.

Method Summary

Methods

Modifier and Type	Method and Description
long	getTransformLength(long size) Return the supported transform length for the specified data size.
void	inverseTransform(DataStorage dataStorage, int modulus, long totalTransformLength) Perform an inverse transform on the data.
void	setParallelRunner(ParallelRunner parallelRunner) Set the parallel runner to be used when executing the transform.
void	transform(DataStorage dataStorage, int modulus) Perform a forward transform on the data.

Methods inherited from class org.apfloat.internal.LongParallelFNTStrategy

multiplyElements, transformRows

Methods inherited from class org.apfloat.internal.LongTableFNTStrategy

inverseTableFNT, tableFNT

Methods inherited from class org.apfloat.internal.LongModMath

createWTable, getForwardNthRoot, getInverseNthRoot, modDivide, modInverse, modPow, negate

Methods inherited from class org.apfloat.internal.LongElementaryModMath

getModulus, modAdd, modMultiply, modSubtract, setModulus

Methods inherited from class java.lang.Object

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

Constructor Detail

LongFactor3SixStepNTTStrategy

public LongFactor3SixStepNTTStrategy(LongSixStepFNTStrategy factor2Strategy)

Creates a new factor-3 transform strategy on top of a six-step transform. The underlying transform needs to be capable of only doing transforms of length 2ⁿ.

Parameters:

factor2Strategy - The underlying transformation strategy, that can be capable of only doing radix-2 transforms.

Method Detail

setParallelRunner

public void setParallelRunner(ParallelRunner parallelRunner)

Description copied from interface: ParallelNTTStrategy

Set the parallel runner to be used when executing the transform.

Specified by:

setParallelRunner in interface ParallelNTTStrategy

Overrides:

setParallelRunner in class LongParallelFNTStrategy

Parameters:

parallelRunner - The parallel runner.

transform

public void transform(DataStorage dataStorage,
             int modulus)
               throws ApfloatRuntimeException

Description copied from interface: NTTStrategy

Perform a forward transform on the data.

Multiple moduli can be used, if the convolution algorithm uses the Chinese Remainder Theorem to calculate the final result.

Specified by:

transform in interface NTTStrategy

Overrides:

transform in class LongTableFNTStrategy

Parameters:

dataStorage - The data to be transformed.

modulus - Number of modulus to use (in case the transform supports multiple moduli).

Throws:

ApfloatRuntimeException

inverseTransform

public void inverseTransform(DataStorage dataStorage,
                    int modulus,
                    long totalTransformLength)
                      throws ApfloatRuntimeException

Description copied from interface: NTTStrategy

Perform an inverse transform on the data.

Multiple moduli can be used, if the convolution algorithm uses the Chinese Remainder Theorem to calculate the final result.

Specified by:

inverseTransform in interface NTTStrategy

Overrides:

inverseTransform in class LongTableFNTStrategy

Parameters:

dataStorage - The data to be transformed.

modulus - Number of modulus to use (in case the transform supports multiple moduli).

totalTransformLength - Total transform length; the final result elements are divided by this value.

Throws:

ApfloatRuntimeException

getTransformLength

public long getTransformLength(long size)

Description copied from interface: NTTStrategy

Return the supported transform length for the specified data size.

Specified by:

getTransformLength in interface NTTStrategy

Overrides:

getTransformLength in class LongTableFNTStrategy

Parameters:

size - Length of the data to be transformed.

Returns:

Length of the transform needed by this transform.