org.geotoolkit.referencing.operation.provider.MapProjectionParameters Maven / Gradle / Ivy
/*
* Geotoolkit.org - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2012, Open Source Geospatial Foundation (OSGeo)
* (C) 2012, Geomatys
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotoolkit.referencing.operation.provider;
import javax.measure.unit.Unit;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.opengis.parameter.ParameterValue;
import org.opengis.parameter.ParameterDescriptor;
import org.opengis.parameter.ParameterNotFoundException;
import org.geotoolkit.util.XArrays;
import org.geotoolkit.resources.Errors;
import org.geotoolkit.parameter.Parameter;
import org.geotoolkit.parameter.Parameters;
import org.geotoolkit.parameter.ParameterGroup;
import org.geotoolkit.parameter.FloatParameter;
import org.geotoolkit.internal.referencing.CRSUtilities;
import org.geotoolkit.parameter.AbstractParameterValue;
import static org.geotoolkit.referencing.operation.provider.UniversalParameters.*;
import static org.geotoolkit.referencing.operation.provider.MapProjectionDescriptor.ADD_EARTH_RADIUS;
import static org.geotoolkit.referencing.operation.provider.MapProjectionDescriptor.ADD_STANDARD_PARALLEL;
/**
* Map projection parameters, with special processing for alternative ways to express the
* ellipsoid axis length and the standard parallels. See {@link MapProjectionDescriptor}
* for more information about those non-standard parameters.
*
* The main purpose of this class is to supported transparently the NetCDF ways to express
* some parameter values.
*
* @author Martin Desruisseaux (Geomatys)
* @version 3.20
*
* @see NetCDF projection parameters
*
* @since 3.20
* @module
*/
final class MapProjectionParameters extends ParameterGroup {
/**
* For cross-version compatibility.
*/
private static final long serialVersionUID = -6801091012335717139L;
/**
* The earth radius parameter. This parameter is computed automatically from the
* {@code "semi_major"} and {@code "semi_minor"}. When explicitely set, this parameter
* value is also assigned to the {@code "semi_major"} and {@code "semi_minor"} axis lengths.
*
* @see org.geotoolkit.referencing.datum.DefaultEllipsoid#getAuthalicRadius()
*/
private final class EarthRadius extends FloatParameter {
/**
* For cross-version compatibility. Actually instances of this class
* are not expected to be serialized, but we try to be a bit safer here.
*/
private static final long serialVersionUID = 5848432458976184182L;
/**
* Creates a new parameter.
*/
EarthRadius() {
super(EARTH_RADIUS);
}
/**
* Invoked when the parameter value is requested. Unconditionally computes
* the authalic radius. If an Earth radius has been explicitely specified,
* the result will be the same unless the user overwrote it with explicit
* semi-major or semi-minor axis length.
*/
@Override
public double doubleValue() {
return CRSUtilities.getAuthalicRadius(get(SEMI_MAJOR), get(SEMI_MINOR));
}
/**
* Invoked when a new parameter value is set. This method sets both axis length
* to the given radius.
*/
@Override
public void setValue(final double value, final Unit unit) {
super.setValue(value, unit); // Perform argument check.
set(SEMI_MAJOR, value, unit);
set(SEMI_MINOR, value, unit);
}
}
/**
* The inverse flattening parameter. This parameter is computed automatically from the
* {@code "semi_major"} and {@code "semi_minor"}. When explicitly set, this parameter
* value is used for computing the semi-minor axis length.
*
* @see org.geotoolkit.referencing.datum.DefaultEllipsoid#getInverseFlattening()
*/
private final class InverseFlattening extends FloatParameter implements ChangeListener {
/**
* For cross-version compatibility. Actually instances of this class
* are not expected to be serialized, but we try to be a bit safer here.
*/
private static final long serialVersionUID = 4490056024453509851L;
/**
* Creates a new parameter.
*/
InverseFlattening() {
super(INVERSE_FLATTENING);
}
/**
* Returns the semi-major parameter, which is needed by this parameter value for
* computing the semi-minor parameter.
*/
private AbstractParameterValue semiMajor() {
return (AbstractParameterValue) parameter("semi_major");
}
/**
* Invoked when the parameter value is requested. Unconditionally computes the inverse
* flattening from the ellipsoid axis lengths. Note that the result will be slightly
* different than the specified value because of rounding errors.
*/
@Override
public double doubleValue() {
final double semiMajorAxis = get(SEMI_MAJOR);
final double semiMinorAxis = get(SEMI_MINOR);
double ivf = semiMajorAxis / (semiMajorAxis - semiMinorAxis);
if (Double.isNaN(ivf)) {
ivf = super.doubleValue();
}
return ivf;
}
/**
* Invoked when a new parameter value is set. This method computes the semi-minor
* axis length from the given value. It will also register a listener in case the
* semi-major axis length is updated after this method call.
*/
@Override
public void setValue(final double value, final Unit unit) {
final boolean wasNull = Double.isNaN(super.doubleValue());
super.setValue(value, unit); // Perform argument check.
if (Double.isNaN(value)) {
if (!wasNull) {
semiMajor().removeChangeListener(this);
}
} else {
if (wasNull) {
semiMajor().addChangeListener(this);
}
update(value);
}
}
/**
* Computes the semi-minor axis length from the given inverse flattening value.
*/
private void update(final double value) {
final ParameterValue semiMajor;
try {
semiMajor = Parameters.getOrCreate(SEMI_MAJOR, MapProjectionParameters.this);
} catch (IllegalStateException e) {
// Semi-major axis is not yet defined.
// Ignore - we will try to compute gain later.
return;
}
set(SEMI_MINOR, semiMajor.doubleValue()*(1 - 1/value), semiMajor.getUnit());
}
/**
* Invoked when the semi-major axis value changed. This method recomputes
* the semi-minor axis length from the ellipsoid.
*/
@Override
public void stateChanged(final ChangeEvent event) {
update(super.doubleValue());
}
}
/**
* The standard parallel parameter as an array of {@code double}. This parameter is computed
* automatically from the {@code "standard_parallel_1"} and {@code "standard_parallel_1"}
* parameters. When explicitely set, the parameter elements are given to the above-cited
* parameters.
*/
private final class StandardParallel extends Parameter {
/**
* For cross-version compatibility. Actually instances of this class
* are not expected to be serialized, but we try to be a bit safer here.
*/
private static final long serialVersionUID = -1379566730374843040L;
/**
* Creates a new parameter.
*/
StandardParallel() {
super(STANDARD_PARALLEL);
}
/**
* Invoked when the parameter value is requested. Unconditionally computes the array
* from the {@code "standard_parallel_1"} and {@code "standard_parallel_1"} parameters.
*/
@Override
public double[] getValue() {
final double standardParallel1 = get(STANDARD_PARALLEL_1);
final double standardParallel2 = get(STANDARD_PARALLEL_2);
if (Double.isNaN(standardParallel2)) {
return Double.isNaN(standardParallel1) ? XArrays.EMPTY_DOUBLE : new double[] {standardParallel1};
}
return new double[] {standardParallel1, standardParallel2};
}
/**
* Invoked when a new parameter value is set. This method assign the array elements
* to @code "standard_parallel_1"} and {@code "standard_parallel_1"} parameters.
*/
@Override
@SuppressWarnings("fallthrough")
protected void setSafeValue(final double[] value, final Unit unit) {
double standardParallel1 = Double.NaN;
double standardParallel2 = Double.NaN;
if (value != null) {
switch (value.length) {
default: {
throw new IllegalArgumentException(Errors.format(Errors.Keys.ILLEGAL_ARGUMENT_$1,
MapProjectionDescriptor.STANDARD_PARALLEL));
}
case 2: standardParallel2 = value[1]; // Fallthrough
case 1: standardParallel1 = value[0]; // Fallthrough
case 0: break;
}
}
set(STANDARD_PARALLEL_1, standardParallel1, unit);
set(STANDARD_PARALLEL_2, standardParallel2, unit);
}
}
/**
* The {@link EarthRadius} parameter instance, created when first needed.
*/
private transient ParameterValue earthRadius;
/**
* The {@link InverseFlattening} parameter instance, created when first needed.
*/
private transient ParameterValue inverseFlattening;
/**
* The {@link StandardParallel} parameter instance, created when first needed.
*/
private transient ParameterValue standardParallel;
/**
* Creates a new parameter value group. An instance of {@link MapProjectionDescriptor}
* is mandatory, because some method in this class will need to cast the descriptor.
*/
MapProjectionParameters(final MapProjectionDescriptor descriptor) {
super(descriptor);
}
/**
* Returns the value associated to the given parameter descriptor.
*/
final double get(final ParameterDescriptor parameter) {
return Parameters.doubleValue(parameter, this);
}
/**
* Sets the value associated to the given parameter descriptor.
*/
final void set(final ParameterDescriptor parameter, final double value, final Unit unit) {
Parameters.getOrCreate(parameter, this).setValue(value, unit);
}
/**
* Returns the value in this group for the specified name. If the given name is one of the
* "invisible" parameters, returns a dynamic parameter view without adding it to the list of
* real parameter values.
*
* @param name The case insensitive name of the parameter to search for.
* @return The parameter value for the given name.
* @throws ParameterNotFoundException if there is no parameter value for the given name.
*/
@Override
public ParameterValue parameter(String name) throws ParameterNotFoundException {
name = name.trim();
final int supplement = ((MapProjectionDescriptor) getDescriptor()).supplement;
if ((supplement & ADD_EARTH_RADIUS) != 0) {
if (name.equalsIgnoreCase(MapProjectionDescriptor.EARTH_RADIUS)) {
ParameterValue value = earthRadius;
if (value == null) {
value = earthRadius = new EarthRadius();
}
return value;
}
if (name.equalsIgnoreCase(MapProjectionDescriptor.INVERSE_FLATTENING)) {
ParameterValue value = inverseFlattening;
if (value == null) {
value = inverseFlattening = new InverseFlattening();
}
return value;
}
}
if ((supplement & ADD_STANDARD_PARALLEL) != 0) {
if (name.equalsIgnoreCase(MapProjectionDescriptor.STANDARD_PARALLEL)) {
ParameterValue value = standardParallel;
if (value == null) {
value = standardParallel = new StandardParallel();
}
return value;
}
}
return super.parameter(name);
}
}