org.sharedx.fftw

Class FftwService

java.lang.Object

org.sharedx.fftw.FftwService

All Implemented Interfaces:

FftService, Service

public class FftwService
extends Object
implements FftService

An FFTW3-backed service provider ascribing to FftService.

Constructor Summary

Constructors

Constructor and Description
FftwService() Default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	fft(int[] dims, double[] in, double[] out) Computes a forward transform.
String	getHint(String name) Gets the value of the given hint.
void	ifft(int[] dims, double[] in, double[] out) Computes a backward transform.
protected static String	modeToString(int mode) Gets a string representation of the execution mode.
void	rfft(int[] dims, double[] in, double[] out) Computes a reduced forward transform.
void	rifft(int[] dims, double[] in, double[] out) Computes a reduced backward transform.
void	setHint(String name, String value) Sets the value of the given hint.
String	toString() Delegates to AbstractMap.toString().
protected void	transform(int type, int[] dims, int mode, double[] in, double[] out) Performs a transform of the given type and dimensions on the given input/output arrays.
protected static String	typeToString(int mode) Gets a string representation of the FFT type.

Methods inherited from class java.lang.Object

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

Constructor Detail

FftwService

public FftwService()

Default constructor.

Method Detail

rfft

public void rfft(int[] dims,
        double[] in,
        double[] out)

Description copied from interface: FftService

Computes a reduced forward transform.

Specified by:

rfft in interface FftService

Parameters:

dims - the dimensions of the transform.

in - the input array.

out - the output array.

rifft

public void rifft(int[] dims,
         double[] in,
         double[] out)

Description copied from interface: FftService

Computes a reduced backward transform.

Specified by:

rifft in interface FftService

Parameters:

dims - the dimensions of the transform.

in - the input array.

out - the output array.

fft

public void fft(int[] dims,
       double[] in,
       double[] out)

Description copied from interface: FftService

Computes a forward transform.

Specified by:

fft in interface FftService

Parameters:

dims - the dimensions of the transform.

in - the input array.

out - the output array.

ifft

public void ifft(int[] dims,
        double[] in,
        double[] out)

Description copied from interface: FftService

Computes a backward transform.

Specified by:

ifft in interface FftService

Parameters:

dims - the dimensions of the transform.

in - the input array.

out - the output array.

setHint

public void setHint(String name,
           String value)

Description copied from interface: FftService

Sets the value of the given hint.

Specified by:

setHint in interface FftService

Parameters:

name - the hint name.

value - the value.

getHint

public String getHint(String name)

Description copied from interface: FftService

Gets the value of the given hint.

Specified by:

getHint in interface FftService

Parameters:

name - the hint name.

Returns:

the hint value.

toString

public String toString()

Delegates to AbstractMap.toString().

Overrides:

toString in class Object

modeToString

protected static final String modeToString(int mode)

Gets a string representation of the execution mode.

typeToString

protected static final String typeToString(int mode)

Gets a string representation of the FFT type.

transform

protected void transform(int type,
             int[] dims,
             int mode,
             double[] in,
             double[] out)

Performs a transform of the given type and dimensions on the given input/output arrays. If a cached transform doesn't exist, a new one is created and cached. Computation time initially depends on the amount of precomputation desired.

Parameters:

type - the kind of transform.

dims - the dimensions of the transform.

mode - the transform mode.

in - the input array.

out - the output array.