/*
 * 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.zhiqiyun.open.core.service.impl.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();

	@Override
	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;
	}

}
