/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2001-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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.geotools.referencing.operation.transform;
import org.geotools.geometry.DirectPosition1D;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.MathTransform1D;
import org.opengis.referencing.operation.Matrix;
import org.opengis.referencing.operation.TransformException;
import org.opengis.referencing.operation.NoninvertibleTransformException;
/**
* Concatenated transform in which the resulting transform is one-dimensional.
*
* @since 2.0
* @source $URL$
* @version $Id$
* @author Martin Desruisseaux (IRD)
*/
final class ConcatenatedTransform1D extends ConcatenatedTransform implements MathTransform1D {
/**
* Serial number for interoperability with different versions.
*/
private static final long serialVersionUID = 8150427971141078395L;
/**
* Constructs a concatenated transform.
*/
public ConcatenatedTransform1D(final MathTransform transform1,
final MathTransform transform2)
{
super(transform1, transform2);
}
/**
* Checks if transforms are compatibles with this implementation.
*/
@Override
boolean isValid() {
return super.isValid() && getSourceDimensions()==1 && getTargetDimensions()==1;
}
/**
* Transforms the specified value.
*/
public double transform(final double value) throws TransformException {
final double[] values = new double[] {value};
final double[] buffer = new double[] {transform1.getTargetDimensions()};
transform1.transform(values, 0, buffer, 0, 1);
transform2.transform(buffer, 0, values, 0, 1);
return values[0];
}
/**
* Gets the derivative of this function at a value.
*/
public double derivative(final double value) throws TransformException {
final DirectPosition1D p = new DirectPosition1D(value);
final Matrix m = derivative(p);
assert m.getNumRow()==1 && m.getNumCol()==1;
return m.getElement(0,0);
}
/**
* Creates the inverse transform of this object.
*/
@Override
public MathTransform1D inverse() throws NoninvertibleTransformException {
return (MathTransform1D) super.inverse();
}
}