/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, 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;
/**
* A one dimensional, identity transform. Output values are identical to input values.
* This class is really a special case of {@link LinearTransform1D} optimized for speed.
*
* @since 2.0
* @source $URL$
* @version $Id$
* @author Martin Desruisseaux (IRD)
*/
final class IdentityTransform1D extends LinearTransform1D {
/**
* Serial number for interoperability with different versions.
*/
private static final long serialVersionUID = -7378774584053573789L;
/**
* The shared instance of the identity transform.
*/
public static final LinearTransform1D ONE = new IdentityTransform1D();
/**
* Constructs a new identity transform.
*/
private IdentityTransform1D() {
super(1, 0);
}
/**
* Transforms the specified value.
*/
@Override
public double transform(double value) {
return value;
}
/**
* Transforms a list of coordinate point ordinal values.
*/
@Override
public void transform(final float[] srcPts, int srcOff,
final float[] dstPts, int dstOff, int numPts)
{
System.arraycopy(srcPts, srcOff, dstPts, dstOff, numPts);
}
/**
* Transforms a list of coordinate point ordinal values.
*/
@Override
public void transform(final double[] srcPts, int srcOff,
final double[] dstPts, int dstOff, int numPts)
{
System.arraycopy(srcPts, srcOff, dstPts, dstOff, numPts);
}
}