/*
* 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.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import org.opengis.geometry.DirectPosition;
/**
* Concatenated transform where the transfert dimension is the same than source and target
* dimension. This fact allows some optimizations, the most important one being the possibility
* to avoid the use of an intermediate buffer in some case.
*
* @since 2.0
* @source $URL$
* @version $Id$
* @author Martin Desruisseaux (IRD)
*/
class ConcatenatedTransformDirect extends ConcatenatedTransform {
/**
* Serial number for interoperability with different versions.
*/
private static final long serialVersionUID = -3568975979013908920L;
/**
* Constructs a concatenated transform.
*/
public ConcatenatedTransformDirect(final MathTransform transform1,
final MathTransform transform2)
{
super(transform1, transform2);
}
/**
* Checks if transforms are compatibles with this implementation.
*/
@Override
boolean isValid() {
return super.isValid() &&
transform1.getSourceDimensions() == transform1.getTargetDimensions() &&
transform2.getSourceDimensions() == transform2.getTargetDimensions();
}
/**
* Transforms the specified {@code ptSrc} and stores the result in {@code ptDst}.
*/
@Override
public DirectPosition transform(final DirectPosition ptSrc, DirectPosition ptDst)
throws TransformException
{
assert isValid();
ptDst = transform1.transform(ptSrc, ptDst);
return transform2.transform(ptDst, ptDst);
}
/**
* Transforms a list of coordinate point ordinal values.
*/
@Override
public void transform(final double[] srcPts, final int srcOff,
final double[] dstPts, final int dstOff, final int numPts)
throws TransformException
{
assert isValid();
transform1.transform(srcPts, srcOff, dstPts, dstOff, numPts);
transform2.transform(dstPts, dstOff, dstPts, dstOff, numPts);
}
// Do NOT override the transform(float[]...) version because we really need to use an
// intermediate buffer of type double[] for reducing rounding error. Otherwise some map
// projection degrades image quality in an unacceptable way.
}