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/*

 * Cresques Mapping Suite. Graphic Library for constructing mapping applications.

 *

 * Copyright (C) 2004-5.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * cresques@gmail.com

 */

package org.cresques.filter.enhancement;

import java.io.File;

import org.cresques.filter.RasterFilter;

import org.cresques.io.datastruct.Statistic;

import org.cresques.io.datastruct.Statistic.History;

import org.gvsig.i18n.Messages;

/**

 * Clase base para los filtros de realzado lineal. Lee el m?nimo y m?xmo de la clase

 * Statistic que ser?n calculados por PercentTailTrimFilter o ComputeMinMaxFilter dependiendo

 * de si est? activado el recorte de colas o no. En Statistic tambi?n est?n los segundos

 * valores despu?s del m?nimo y m?ximo que son los que se utilizan con la opci?n eliminar

 * extremos activada. Estos se usaran en vez del m?nimo y m?ximo cuando la variable

 * removeExtrema est? a true.

 * @author Nacho Brodin (brodin_ign@gva.es)

 */

public abstract class LinearEnhancementFilter extends RasterFilter {

    protected double[] scale = new double[3];

    protected double[] offset = new double[3];

    protected double[] minBandValue = null;

    protected double[] maxBandValue = null;

    protected boolean removeExtrema = false;

    protected String filename = null;

    /**

     * Constructor

     *

     */

    public LinearEnhancementFilter() {

        super();

        super.filterName = Messages.getText("enhancement");

    }

    /* (non-Javadoc)

     * @see org.cresques.io.raster.IRasterFilter#pre()

     */

    public void pre() {

             if (removeExtrema) { //Si est? activado eliminar extremos gastamos el 2? m?ximo/m?nimo

            if ((filename != null) && !filename.equals("")) {

                for (int i = 0; i < stats.history.size(); i++) {

                    Statistic.History history = (Statistic.History) stats.history.get(i);

                    if (history.file.equals(filename.substring((filename.lastIndexOf(File.separator) +

                                                                   1),

                                                                   filename.length()))) {

                        this.minBandValue = history.secMin;

                        this.maxBandValue = history.secMax;

                    }

                }

            }

            if ((this.minBandValue == null) || (this.maxBandValue == null)) {

                this.minBandValue = stats.secondMinBandValue;

                this.maxBandValue = stats.secondMaxBandValue;

            }

        } else { //Si no est? activado eliminar extremos

            if ((filename != null) && !filename.equals("")) {

                for (int i = 0; i < stats.history.size(); i++) {

                    Statistic.History history = (Statistic.History) stats.history.get(i);

                    if (history.file.equals(filename.substring((filename.lastIndexOf(File.separator) +

                                                                   1),

                                                                   filename.length()))) {

                        this.minBandValue = history.min;

                        this.maxBandValue = history.max;

                    }

                }

            }

            if ((this.minBandValue == null) || (this.maxBandValue == null)) {

                this.minBandValue = stats.minBandValue;

                this.maxBandValue = stats.maxBandValue;

            }

        }

        for (int i = 0; i < 3; i++) {

            scale[i] = 255D / (maxBandValue[i] - minBandValue[i]);

            offset[i] = (255D * minBandValue[i]) / (minBandValue[i] -

                        maxBandValue[i]);

        }

    }

    /**

     * Obtiene true si est? activado el flag de eliminar extremos y false si no lo est?

     */

    public Boolean getRemoveExtrema() {

        return new Boolean(removeExtrema);

    }

}