MapPathUtils.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.model.mapmodel;

import org.jetbrains.annotations.NotNull;

public class MapPathUtils {

    private MapPathUtils() {
    }

    @NotNull
    public static MapPath newMapPath(@NotNull final String string) {
        if (string.startsWith("/")) {
            return append(new AbsoluteMapPath(), string);
        } else {
            return append(new RelativeMapPath(), string);
        }
    }

    @NotNull
    public static AbsoluteMapPath newAbsoluteMapPath(@NotNull final String string) {
        if (!string.startsWith("/")) {
            throw new IllegalArgumentException("map path '" + string + "' is not absolute");
        }
        return append(new AbsoluteMapPath(), string);
    }

    @NotNull
    public static RelativeMapPath newRelativeMapPath(@NotNull final String string) {
        if (string.startsWith("/")) {
            throw new IllegalArgumentException("map path '" + string + "' is not relative");
        }
        return append(new RelativeMapPath(), string);
    }

    @NotNull
    public static AbsoluteMapPath append(@NotNull final AbsoluteMapPath baseMapPath, @NotNull final MapPath mapPath) {
        return mapPath instanceof AbsoluteMapPath ? (AbsoluteMapPath) mapPath : append(baseMapPath, mapPath.getPath());
    }

    @NotNull
    public static RelativeMapPath append(@NotNull final RelativeMapPath baseMapPath, @NotNull final RelativeMapPath mapPath) {
        return append(baseMapPath, mapPath.getPath());
    }

    @NotNull
    private static AbsoluteMapPath append(@NotNull final AbsoluteMapPath mapPath, @NotNull final CharSequence string) {
        AbsoluteMapPath result = mapPath;
        final String tmpPath = result.getPath();
        if (!tmpPath.isEmpty() && !tmpPath.equals("..") && !tmpPath.endsWith("/..")) {
            result = new AbsoluteMapPath(result, "..");
        }
        for (final String path : MapPath.SEPARATOR.split(string, -1)) {
            if (!path.isEmpty()) {
                result = new AbsoluteMapPath(result, path);
            }
        }
        return result;
    }

    @NotNull
    private static RelativeMapPath append(@NotNull final RelativeMapPath mapPath, @NotNull final CharSequence string) {
        RelativeMapPath result = mapPath;
        final String tmpPath = result.getPath();
        if (!tmpPath.isEmpty() && !tmpPath.equals("..") && !tmpPath.endsWith("/..")) {
            result = new RelativeMapPath(result, "..");
        }
        for (final String path : MapPath.SEPARATOR.split(string, -1)) {
            if (!path.isEmpty()) {
                result = new RelativeMapPath(result, path);
            }
        }
        return result;
    }

}