AbstractFilterFactory.java

/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca 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, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca 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.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see <http://www.gnu.org/licenses/>.
 */
package com.xiongyingqi.captcha.filter;

import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.util.List;

public abstract class AbstractFilterFactory implements FilterFactory {

    protected abstract List<BufferedImageOp> getFilters();

    public BufferedImage applyFilters(BufferedImage source) {
        BufferedImage dest = source;
        for (BufferedImageOp filter : getFilters()) {
            dest = filter.filter(dest, null);
        }
        int x = (source.getWidth() - dest.getWidth()) / 2;
        int y = (source.getHeight() - dest.getHeight()) / 2;
        source = new BufferedImage(source.getWidth(), source.getHeight(), source.getType());
        source.getGraphics().drawImage(dest, x, y, null);
        return source;
    }

}