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Flying Saucer is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code as well as Java2D output.

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/*
 * {{{ header & license
 * Copyright (c) 2004, 2005 Joshua Marinacci
 *
 * This program 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 2.1
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 * }}}
 */
package org.xhtmlrenderer.util;

import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;

@ParametersAreNonnullByDefault
public class Util {
    public static String replace(String source, String target, String replacement) {
        StringBuilder output = new StringBuilder();
        int n = 0;
        while (true) {
            int off = source.indexOf(target, n);
            if (off == -1) {
                output.append(source.substring(n));
                break;
            }
            output.append(source, n, off);
            output.append(replacement);
            n = off + target.length();
        }
        return output.toString();
    }
    
    public static boolean isNullOrEmpty(@Nullable String str) {
        return str == null || str.isEmpty();
    }
}