Package org.geotools.referencing.operation

Class MathTransformProvider

Object

Formattable

AbstractIdentifiedObject

DefaultOperationMethod

MathTransformProvider

All Implemented Interfaces:

Serializable, IdentifiedObject, OperationMethod, PROJFormattable

Direct Known Subclasses:

EarthGravitationalModel.Provider, ExponentialTransform1D.Provider, GeocentricTransform.Provider, GeocentricTranslation.Provider, LogarithmicTransform1D.Provider, MapProjection.AbstractProvider, MolodenskiTransform.Provider, NADCONTransform.Provider, NTv2Transform.Provider, ProjectiveTransform.ProviderAffine, ProjectiveTransform.ProviderLongitudeRotation, SimilarityTransformProvider, WarpTransform2DProvider

public abstract class MathTransformProvider
extends DefaultOperationMethod

An operation method capable to creates a math transform from set of parameter values. Implementations of this class should be listed in the following file:

META-INF/services/org.geotools.referencing.operation.MathTransformProvider

The math transform factory will parse this file in order to gets all available providers on a system. If this file is bundle in many JAR files, the math transform factory will read all of them.

Since:

2.0

Author:

Martin Desruisseaux (IRD)

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static final class	MathTransformProvider.Delegate	The result of a call to createMathTransform.

Field Summary

Fields inherited from class DefaultOperationMethod

sourceDimensions, targetDimensions

Fields inherited from class AbstractIdentifiedObject

EMPTY_ALIAS_ARRAY, EMPTY_IDENTIFIER_ARRAY, IDENTIFIER_COMPARATOR, NAME_COMPARATOR, REMARKS_COMPARATOR

Fields inherited from class Formattable

SINGLE_LINE

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Fields inherited from interface OperationMethod

FORMULA_KEY

Constructor Summary

Constructors

Constructor	Description
MathTransformProvider(int sourceDimensions, int targetDimensions, ParameterDescriptorGroup parameters)	Constructs a math transform provider from a set of parameters.
MathTransformProvider(Map<String,?> properties, int sourceDimensions, int targetDimensions, ParameterDescriptorGroup parameters)	Constructs a math transform provider from a set of properties.

Method Summary

Modifier and Type	Method	Description
protected static ParameterDescriptor<Double>	createDescriptor(ReferenceIdentifier[] identifiers, double defaultValue, double minimum, double maximum, Unit<?> unit)	Constructs a parameter descriptor from a set of alias.
protected static ParameterDescriptorGroup	createDescriptorGroup(ReferenceIdentifier[] identifiers, GeneralParameterDescriptor[] parameters)	Constructs a parameter group from a set of alias.
protected abstract MathTransform	createMathTransform(ParameterValueGroup values)	Creates a math transform from the specified group of parameter values.
protected static ParameterDescriptor<Double>	createOptionalDescriptor(ReferenceIdentifier[] identifiers, double minimum, double maximum, Unit<?> unit)	Constructs an optional parameter descriptor from a set of alias.
protected static double	doubleValue(ParameterDescriptor<?> param, ParameterValueGroup group)	Returns the parameter value for the specified operation parameter.
protected ParameterValueGroup	ensureValidValues(ParameterValueGroup values)	Ensures that the given set of parameters contains only valid values.
protected String	formatWKT(Formatter formatter)	Format the inner part of a Well Known Text (WKT) element.
Class<? extends Operation>	getOperationType()	Returns the operation type.
protected static <T> ParameterValue<T>	getParameter(ParameterDescriptor<T> param, ParameterValueGroup group)	Returns the parameter value for the specified operation parameter.
protected static int	intValue(ParameterDescriptor<?> param, ParameterValueGroup group)	Returns the parameter value for the specified operation parameter.
protected static String	stringValue(ParameterDescriptor<?> param, ParameterValueGroup group)	Returns the parameter value for the specified operation parameter.
protected static Map<String,Object>	toMap(ReferenceIdentifier... identifiers)	Put the identifiers into a properties map suitable for IdentifiedObject constructor.
protected static <T> T	value(ParameterDescriptor<T> param, ParameterValueGroup group)	Returns the parameter value for the specified operation parameter.

Methods inherited from class DefaultOperationMethod

checkDimensions, equals, formatPROJ, getFormula, getParameters, getSourceDimensions, getTargetDimensions, hashCode

Methods inherited from class AbstractIdentifiedObject

asSet, ensureAngularUnit, ensureLinearUnit, ensureNonNull, ensureNonNull, ensureTimeUnit, equals, equals, equals, equals, getAlias, getIdentifier, getIdentifier, getIdentifiers, getName, getName, getName, getProperties, getProperties, getRemarks, nameMatches, nameMatches, nameMatches

Methods inherited from class Formattable

cleanupThreadLocals, toString, toWKT, toWKT, toWKT, toWKT

Methods inherited from class Object

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

Methods inherited from interface IdentifiedObject

getAlias, getIdentifiers, getName, getRemarks, toWKT

Constructor Details

MathTransformProvider

public MathTransformProvider(int sourceDimensions,
 int targetDimensions,
 ParameterDescriptorGroup parameters)

Constructs a math transform provider from a set of parameters. The provider identifiers will be the same than the parameter ones.

Parameters:

sourceDimensions - Number of dimensions in the source CRS of this operation method.

targetDimensions - Number of dimensions in the target CRS of this operation method.

parameters - The set of parameters (never null).

MathTransformProvider

public MathTransformProvider(Map<String,?> properties,
 int sourceDimensions,
 int targetDimensions,
 ParameterDescriptorGroup parameters)

Constructs a math transform provider from a set of properties. The properties map is given unchanged to the super-class constructor.

Parameters:

properties - Set of properties. Should contains at least "name".

sourceDimensions - Number of dimensions in the source CRS of this operation method.

targetDimensions - Number of dimensions in the target CRS of this operation method.

parameters - The set of parameters (never null).

Method Details

getOperationType

public Class<? extends Operation> getOperationType()

Returns the operation type. It may be Operation.class, Conversion.class, Projection.class, etc.

The default implementation returns Operation.class. Subclass should overrides this methods and returns the appropriate OpenGIS interface type (not the implementation type).

Returns:

The GeoAPI interface implemented by this operation.

createMathTransform

protected abstract MathTransform createMathTransform(ParameterValueGroup values)
                                              throws InvalidParameterNameException,
ParameterNotFoundException,
InvalidParameterValueException,
FactoryException

Creates a math transform from the specified group of parameter values. Subclasses can implements this method as in the example below:

 double semiMajor = values.parameter("semi_major").doubleValue(SI.METRE);
 double semiMinor = values.parameter("semi_minor").doubleValue(SI.METRE);
 // etc...
 return new MyTransform(semiMajor, semiMinor, ...);
 

Parameters:

values - The group of parameter values.

Returns:

The created math transform.

Throws:

InvalidParameterNameException - if the values contains an unknow parameter.

ParameterNotFoundException - if a required parameter was not found.

InvalidParameterValueException - if a parameter has an invalid value.

FactoryException - if the math transform can't be created for some other reason (for example a required file was not found).

See Also:

• MathTransformProvider.Delegate

createDescriptor

protected static ParameterDescriptor<Double> createDescriptor(ReferenceIdentifier[] identifiers,
 double defaultValue,
 double minimum,
 double maximum,
 Unit<?> unit)

Constructs a parameter descriptor from a set of alias. The parameter is identified by codes provided by one or more authorities. Common authorities are OGC and EPSG for example.

The first entry in the identifiers array is both the main name and the identifiers. All others are aliases.

Parameters:

identifiers - The parameter identifiers. Most contains at least one entry.

defaultValue - The default value for the parameter, or Double.NaN if none.

minimum - The minimum parameter value, or Double.NEGATIVE_INFINITY if none.

maximum - The maximum parameter value, or Double.POSITIVE_INFINITY if none.

unit - The unit for default, minimum and maximum values.

Returns:

The descriptor for the given identifiers.

createOptionalDescriptor

protected static ParameterDescriptor<Double> createOptionalDescriptor(ReferenceIdentifier[] identifiers,
 double minimum,
 double maximum,
 Unit<?> unit)

Constructs an optional parameter descriptor from a set of alias. The parameter is identified as with createDescriptor(org.geotools.api.referencing.ReferenceIdentifier[], double, double, double, javax.measure.Unit<?>).

Parameters:

identifiers - The parameter identifiers. Most contains at least one entry.

minimum - The minimum parameter value, or Double.NEGATIVE_INFINITY if none.

maximum - The maximum parameter value, or Double.POSITIVE_INFINITY if none.

unit - The unit for default, minimum and maximum values.

Returns:

The descriptor for the given identifiers.

createDescriptorGroup

protected static ParameterDescriptorGroup createDescriptorGroup(ReferenceIdentifier[] identifiers,
 GeneralParameterDescriptor[] parameters)

Constructs a parameter group from a set of alias. The parameter group is identified by codes provided by one or more authorities. Common authorities are OGC and EPSG for example.

Special rules:

• The first entry in the identifiers array is the primary name.
• If a an entry do not implements the GenericName interface, it is an identifiers.
• All others are aliases.

Parameters:

identifiers - The operation identifiers. Most contains at least one entry.

parameters - The set of parameters, or null or an empty array if none.

Returns:

The descriptor for the given identifiers.

toMap

protected static Map<String,Object> toMap(ReferenceIdentifier... identifiers)

Put the identifiers into a properties map suitable for IdentifiedObject constructor.

ensureValidValues

protected ParameterValueGroup ensureValidValues(ParameterValueGroup values)
                                         throws InvalidParameterNameException,
InvalidParameterValueException

Ensures that the given set of parameters contains only valid values. This method compares all parameter names against the names declared in the operation method parameter descriptor. If an unknow parameter name is found, then an InvalidParameterNameException is thrown. This method also ensures that all values are assignable to the expected class, are between the minimum and maximum values and are one of the set of valid values. If the value fails any of those tests, then an InvalidParameterValueException is thrown.

Parameters:

values - The parameters values to check.

Returns:

The parameter values to use for math transform construction. May be different than the supplied values argument if some missing values needed to be filled with default values.

Throws:

InvalidParameterNameException - if a parameter name is unknow.

InvalidParameterValueException - if a parameter has an invalid value.

getParameter

protected static <T> ParameterValue<T> getParameter(ParameterDescriptor<T> param,
 ParameterValueGroup group)
                                             throws ParameterNotFoundException

Returns the parameter value for the specified operation parameter. This convenience method is used by subclasses for initializing math transform from a set of parameters.

Parameters:

param - The parameter to look for.

group - The parameter value group to search into.

Returns:

The requested parameter value.

Throws:

ParameterNotFoundException - if the parameter is not found.

value

protected static <T> T value(ParameterDescriptor<T> param,
 ParameterValueGroup group)
                      throws ParameterNotFoundException

Returns the parameter value for the specified operation parameter. This convenience method is used by subclasses for initializing math transform from a set of parameters.

Type Parameters:

T - The type of parameter value.

Parameters:

param - The parameter to look for.

group - The parameter value group to search into.

Returns:

The requested parameter value, or null if param is optional and the user didn't provided any value.

Throws:

ParameterNotFoundException - if the parameter is not found.

stringValue

protected static String stringValue(ParameterDescriptor<?> param,
 ParameterValueGroup group)
                             throws ParameterNotFoundException

Returns the parameter value for the specified operation parameter. This convenience method is used by subclasses for initializing math transform from a set of parameters.

Parameters:

param - The parameter to look for.

group - The parameter value group to search into.

Returns:

The requested parameter value, or null if param is optional and the user didn't provided any value.

Throws:

ParameterNotFoundException - if the parameter is not found.

intValue

protected static int intValue(ParameterDescriptor<?> param,
 ParameterValueGroup group)
                       throws ParameterNotFoundException

Returns the parameter value for the specified operation parameter. This convenience method is used by subclasses for initializing math transform from a set of parameters.

Parameters:

param - The parameter to look for.

group - The parameter value group to search into.

Returns:

The requested parameter value, or 0 if param is optional and the user didn't provided any value.

Throws:

ParameterNotFoundException - if the parameter is not found.

doubleValue

protected static double doubleValue(ParameterDescriptor<?> param,
 ParameterValueGroup group)
                             throws ParameterNotFoundException

Returns the parameter value for the specified operation parameter. Values are automatically converted into the standard units specified by the supplied param argument. This convenience method is used by subclasses for initializing math transform from a set of parameters.

Parameters:

param - The parameter to look for.

group - The parameter value group to search into.

Returns:

The requested parameter value, or NaN if param is optional and the user didn't provided any value.

Throws:

ParameterNotFoundException - if the parameter is not found.

formatWKT

protected String formatWKT(Formatter formatter)

Format the inner part of a Well Known Text (WKT) element.

Overrides:

formatWKT in class DefaultOperationMethod

Parameters:

formatter - The formatter to use.

Returns:

The WKT element name.

See Also:

• Formattable.toWKT()
• Formattable.toString()