/*
VisAD system for interactive analysis and visualization of numerical
data.  Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/

package visad.data.dods;

import dods.dap.*;
import java.rmi.RemoteException;
import visad.data.BadFormException;
import visad.VisADException;

/**
 * Provides support for processing unsigned integer values in a DODS
 * dataset.  Processing includes checking for validity and unpacking.
 *
 * <P>Instances are immutable.</P>
 *
 * @author Steven R. Emmerson
 */
public abstract class UIntValuator
    extends	IntValuator
{
    private final float		floatFold;
    private final double	doubleFold;

    /**
     * Constructs from the attributes of a DODS variable.
     *
     * @param table		The attribute table for a DODS variable.
     * @param upper		Natural upper limit on packed values.
     * @throws BadFormException	The attribute table is corrupt.
     * @throws VisADException	VisAD failure.
     * @throws RemoteException	Java RMI failure.
     */
    protected UIntValuator(AttributeTable table, long upper)
	throws BadFormException, VisADException, RemoteException
    {
	super(table, 0, upper);
	floatFold = (upper+1)/2;
	doubleFold = (upper+1)/2;
    }

    /**
     * Processes a value.
     *
     * @param value		The packed value to be processed.
     */
    public float process(float value)
    {
	return super.process(value < 0 ? value + floatFold : value);
    }

    /**
     * Processes a value.
     *
     * @param values		The packed values to be processed.
     */
    public float[] process(float[] values)
    {
	for (int i = 0; i < values.length; ++i)
	    if (values[i] < 0)
		values[i] += floatFold;
	return super.process(values);
    }

    /**
     * Processes values.
     *
     * @param value		The packed value to be processed.
     */
    public double process(double value)
    {
	return super.process(value < 0 ? value + doubleFold : value);
    }

    /**
     * Processes values.
     *
     * @param values		The packed values to be processed.
     */
    public double[] process(double[] values)
    {
	for (int i = 0; i < values.length; ++i)
	    if (values[i] < 0)
		values[i] += doubleFold;
	return super.process(values);
    }
}