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package org.jgrasstools.lesto.modules.vegetation.watershed;

/*
 * Watershed plugin
 *
 * Copyright (c) 2003 by Christopher Mei ([email protected])
 *
 * This plugin is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 
 * as published by the Free Software Foundation.
 *
 * 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 plugin; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

import java.util.LinkedList;

/** This class implements a FIFO queue that
 *  uses the same formalism as the Vincent
 *  and Soille algorithm (1991)
 **/

public class WatershedFIFO {
    private LinkedList watershedFIFO;

    public WatershedFIFO() {
        watershedFIFO = new LinkedList();
    }

    public void fifo_add( WatershedPixel p ) {
        watershedFIFO.addFirst(p);
    }

    public WatershedPixel fifo_remove() {
        return (WatershedPixel) watershedFIFO.removeLast();
    }

    public boolean fifo_empty() {
        return watershedFIFO.isEmpty();
    }

    public void fifo_add_FICTITIOUS() {
        watershedFIFO.addFirst(new WatershedPixel());
    }

    public String toString() {
        StringBuffer ret = new StringBuffer();
        for( int i = 0; i < watershedFIFO.size(); i++ ) {
            ret.append(((WatershedPixel) watershedFIFO.get(i)).toString());
            ret.append("\n");
        }

        return ret.toString();
    }
}