RelativeMapPath.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.model.mapmodel;
 
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class RelativeMapPath implements Comparable<RelativeMapPath>, MapPath {
 
    private static final long serialVersionUID = 1L;
 
    @NotNull
    private final String path;
 
    public RelativeMapPath() {
        path = "";
    }
 
    public RelativeMapPath(@NotNull final RelativeMapPath parent, @NotNull final String name) {
        if (name.isEmpty()) {
            throw new IllegalArgumentException("map file is empty");
        }
        if (name.contains("/")) {
            throw new IllegalArgumentException("map file contains '/': " + name);
        }
        if (name.equals(".")) {
            path = parent.path;
        } else if (name.equals("..")) {
            if (parent.path.isEmpty()) {
                path = "..";
            } else if (parent.path.endsWith("/..") || parent.path.equals("..")) {
                path = parent.path + "/..";
            } else {
                final int index = parent.path.lastIndexOf('/');
                path = index == -1 ? "" : parent.path.substring(0, index);
            }
        } else {
            path = parent.path.isEmpty() ? name : parent.path + "/" + name;
        }
    }
 
    @SuppressWarnings("TypeMayBeWeakened")
    public RelativeMapPath(@NotNull final AbsoluteMapPath sourceMapPath, @NotNull final AbsoluteMapPath destinationMapPath) {
        final String[] source = MapPath.SEPARATOR.split(sourceMapPath.getPath(), -1);
        final String[] destination = MapPath.SEPARATOR.split(destinationMapPath.getPath(), -1);
        int begin = 0;
        while (begin < source.length && begin < destination.length && source[begin].equals(destination[begin])) {
            begin++;
        }
        if (begin == destination.length && begin > 0) {
            begin--;
        }
        final StringBuilder sb = new StringBuilder();
        int i = source.length - 1;
        while (i > begin) {
            sb.append("/..");
            i--;
        }
        while (i < destination.length) {
            sb.append("/").append(destination[i]);
            i++;
        }
        path = sb.length() > 0 ? sb.substring(1) : "";
    }
 
    @NotNull
    @Override
 
    public String getPath() {
        return path;
    }
 
    @Nullable
    @Override
    public String getMapComponent() {
        return null;
    }
 
    @NotNull
    @Override
    public RelativeMapPath getRelativeMapPathFrom(@NotNull final AbsoluteMapPath mapPath) {
        //noinspection ReturnOfThis
        return this;
    }
 
    @Override
    public int compareTo(@NotNull final RelativeMapPath o) {
        return path.compareTo(o.path);
    }
 
    @Override
    public boolean equals(@Nullable final Object obj) {
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        final RelativeMapPath mapPath = (RelativeMapPath) obj;
        return path.equals(mapPath.path);
    }
 
    @Override
    public int hashCode() {
        return path.hashCode();
    }
 
    @Override
    public String toString() {
        return path;
    }
 
}