Class RepeatedTransform

java.lang.Object

org.apache.sis.io.wkt.FormattableObject

org.apache.sis.referencing.operation.transform.AbstractMathTransform

org.apache.sis.internal.coverage.CompoundTransform

org.apache.sis.internal.coverage.RepeatedTransform

All Implemented Interfaces:

Parameterized, LenientComparable, org.opengis.referencing.operation.MathTransform

final class RepeatedTransform
extends CompoundTransform

An special case of CompoundTransform where the components are the same transform repeated many times. This optimization allows to replace many single transform(…) calls by a single transform(…) call on a larger array segment.

Since:

1.1

Version:

1.1

Nested Class Summary

Nested classes/interfaces inherited from class AbstractMathTransform

AbstractMathTransform.Inverse

Field Summary

Fields

Modifier and Type	Field	Description
private final org.opengis.referencing.operation.MathTransform	component	The transform which is repeated.
private final int	repetition	Number of times that the component is repeated.

Constructor Summary

Constructors

Constructor	Description
RepeatedTransform(org.opengis.referencing.operation.MathTransform component, int repetition)	Creates a new compound transform.

Method Summary

Modifier and Type	Method	Description
(package private) final org.opengis.referencing.operation.MathTransform[]	components()	Returns the components of this compound transform.
int	getSourceDimensions()	Returns the number of source dimensions of this compound transform.
int	getTargetDimensions()	Returns the number of target dimensions of this compound transform.
boolean	isIdentity()	Tests whether this transform does not move any points.
org.opengis.referencing.operation.Matrix	transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, boolean derivate)	Transforms a single coordinate tuple in an array, and optionally computes the transform derivative at that location.
void	transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)	Transforms a list of coordinate tuples.
void	transform(double[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)	Transforms a list of coordinate tuples.
void	transform(float[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)	Transforms a list of coordinate tuples.
void	transform(float[] srcPts, int srcOff, float[] dstPts, int dstOff, int numPts)	Transforms a list of coordinate tuples.

Methods inherited from class CompoundTransform

computeHashCode, create, equals, inverse, tryConcatenate

Methods inherited from class AbstractMathTransform

derivative, equals, formatTo, getContextualParameters, getDomain, getParameterDescriptors, getParameterValues, hashCode, transform

Methods inherited from class FormattableObject

print, toString, toString, toWKT

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.opengis.referencing.operation.MathTransform

toWKT

Field Details

component

private final org.opengis.referencing.operation.MathTransform component

The transform which is repeated.

repetition

private final int repetition

Number of times that the component is repeated. Should be greater than 1 (otherwise the use of this class is pointless).

Constructor Details

RepeatedTransform

RepeatedTransform(org.opengis.referencing.operation.MathTransform component,
 int repetition)

Creates a new compound transform.

Parameters:

component - the transform which is repeated.

repetition - number of times that the component is repeated.

Method Details

components

final org.opengis.referencing.operation.MathTransform[] components()

Returns the components of this compound transform.

Specified by:

components in class CompoundTransform

getSourceDimensions

public int getSourceDimensions()

Returns the number of source dimensions of this compound transform. This is the sum of the number of source dimensions of all components.

Specified by:

getSourceDimensions in interface org.opengis.referencing.operation.MathTransform

Overrides:

getSourceDimensions in class CompoundTransform

Returns:

the number of dimensions of input points.

See Also:

• DefaultOperationMethod.getSourceDimensions()

getTargetDimensions

public int getTargetDimensions()

Returns the number of target dimensions of this compound transform. This is the sum of the number of target dimensions of all components.

Specified by:

getTargetDimensions in interface org.opengis.referencing.operation.MathTransform

Overrides:

getTargetDimensions in class CompoundTransform

Returns:

the number of dimensions of output points.

See Also:

• DefaultOperationMethod.getTargetDimensions()

isIdentity

public boolean isIdentity()

Tests whether this transform does not move any points.

Specified by:

isIdentity in interface org.opengis.referencing.operation.MathTransform

Overrides:

isIdentity in class CompoundTransform

Returns:

true if all transform components are identity.

transform

public org.opengis.referencing.operation.Matrix transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 boolean derivate)
                                                   throws org.opengis.referencing.operation.TransformException

Transforms a single coordinate tuple in an array, and optionally computes the transform derivative at that location.

Specified by:

transform in class AbstractMathTransform

Parameters:

srcPts - the array containing the source coordinates (cannot be null).

srcOff - the offset to the point to be transformed in the source array.

dstPts - the array into which the transformed coordinates is returned. May be the same than srcPts. May be null if only the derivative matrix is desired.

dstOff - the offset to the location of the transformed point that is stored in the destination array.

derivate - true for computing the derivative, or false if not needed.

Returns:

the matrix of the transform derivative at the given source position, or null if the derivate argument is false.

Throws:

org.opengis.referencing.operation.TransformException - if the point cannot be transformed or if a problem occurred while calculating the derivative.

See Also:

• AbstractMathTransform.derivative(DirectPosition)
• AbstractMathTransform.transform(DirectPosition, DirectPosition)
• MathTransforms.derivativeAndTransform(MathTransform, double[], int, double[], int)

transform

public void transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 int numPts)
               throws org.opengis.referencing.operation.TransformException

Transforms a list of coordinate tuples.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class AbstractMathTransform

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

Throws:

org.opengis.referencing.operation.TransformException - if a point cannot be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the untransformable points with Double.NaN values, continue and throw the exception only at end. Implementations that fall in the latter case should set the last completed transform to this.

transform

public void transform(float[] srcPts,
 int srcOff,
 float[] dstPts,
 int dstOff,
 int numPts)
               throws org.opengis.referencing.operation.TransformException

Transforms a list of coordinate tuples.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class AbstractMathTransform

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned. May be the same than srcPts.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

Throws:

org.opengis.referencing.operation.TransformException - if a point cannot be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the un-transformable points with Float.NaN values, continue and throw the exception only at end. Implementations that fall in the latter case should set the last completed transform to this.

transform

public void transform(double[] srcPts,
 int srcOff,
 float[] dstPts,
 int dstOff,
 int numPts)
               throws org.opengis.referencing.operation.TransformException

Transforms a list of coordinate tuples.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class AbstractMathTransform

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

Throws:

org.opengis.referencing.operation.TransformException - if a point cannot be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the untransformable points with Float.NaN values, continue and throw the exception only at end. Implementations that fall in the latter case should set the last completed transform to this.

transform

public void transform(float[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 int numPts)
               throws org.opengis.referencing.operation.TransformException

Transforms a list of coordinate tuples.

Specified by:

transform in interface org.opengis.referencing.operation.MathTransform

Overrides:

transform in class AbstractMathTransform

Parameters:

srcPts - the array containing the source point coordinates.

srcOff - the offset to the first point to be transformed in the source array.

dstPts - the array into which the transformed point coordinates are returned.

dstOff - the offset to the location of the first transformed point that is stored in the destination array.

numPts - the number of point objects to be transformed.

Throws:

org.opengis.referencing.operation.TransformException - if a point cannot be transformed. Some implementations will stop at the first failure, wile some other implementations will fill the untransformable points with Double.NaN values, continue and throw the exception only at end. Implementations that fall in the latter case should set the last completed transform to this.