HtmlUtils.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2023 The Gridarta Developers.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package net.sf.gridarta.utils;
 
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class HtmlUtils {
 
    private HtmlUtils() {
    }
 
    @Nullable
    public static String encodeOptional(@Nullable final String str) {
        return str == null ? null : encode(str);
    }
 
    @NotNull
    public static String encode(@NotNull final String str) {
        final StringBuilder sb = new StringBuilder(str.length());
        for (final char ch : str.toCharArray()) {
            switch (ch) {
            case '<':
                sb.append("&lt;");
                break;
 
            case '>':
                sb.append("&gt;");
                break;
 
            case '&':
                sb.append("&amp;");
                break;
 
            default:
                sb.append(ch);
                break;
            }
        }
        return sb.toString();
    }
 
}