Codec.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2015 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.preferences;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jetbrains.annotations.NotNull;

public class Codec {

    @NotNull
    private static final Pattern[] PATTERNS_ENCODE = { Pattern.compile("\\\\"), Pattern.compile("\r"), Pattern.compile("\n"), };

    @NotNull
    private static final String[] REPLACEMENTS_ENCODE = { Matcher.quoteReplacement("\\\\"), Matcher.quoteReplacement("\\r"), Matcher.quoteReplacement("\\n"), };

    @NotNull
    private static final Pattern[] PATTERNS_DECODE = { Pattern.compile("\\\\n"), Pattern.compile("\\\\r"), Pattern.compile("\\\\\\\\"), };

    @NotNull
    private static final String[] REPLACEMENTS_DECODE = { Matcher.quoteReplacement("\n"), Matcher.quoteReplacement("\r"), Matcher.quoteReplacement("\\"), };

    private Codec() {
    }

    @NotNull
    public static String encode(@NotNull final String str) {
        assert PATTERNS_ENCODE.length == REPLACEMENTS_ENCODE.length;
        String tmp = str;
        for (int i = 0; i < PATTERNS_ENCODE.length; i++) {
            tmp = PATTERNS_ENCODE[i].matcher(tmp).replaceAll(REPLACEMENTS_ENCODE[i]);
        }
        return tmp;
    }

    @NotNull
    public static String decode(@NotNull final String str) {
        assert PATTERNS_DECODE.length == REPLACEMENTS_DECODE.length;
        String tmp = str;
        for (int i = 0; i < PATTERNS_DECODE.length; i++) {
            tmp = PATTERNS_DECODE[i].matcher(tmp).replaceAll(REPLACEMENTS_DECODE[i]);
        }
        return tmp;
    }

}