AbstractMapArchObjectParser.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.io;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import net.sf.gridarta.model.maparchobject.MapArchObject;
import net.sf.gridarta.utils.StringUtils;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public abstract class AbstractMapArchObjectParser<A extends MapArchObject<A>> implements MapArchObjectParser<A> {
 
    @NotNull
    private static final Pattern KEY_VALUE_PATTERN = Pattern.compile("([^ ]+) +(.+)");
 
    @Override
    public void load(@NotNull final BufferedReader reader, @NotNull final A mapArchObject) throws IOException {
        final String firstLine = reader.readLine();
        if (firstLine == null) {
            throw new IOException("unexpected end of file in map header");
        }
 
        final String trimmedFirstLine = StringUtils.removeTrailingWhitespace(firstLine);
        if (!trimmedFirstLine.equals("arch map")) {
            throw new InvalidMapFormatException("unexpected first line of map file: '" + trimmedFirstLine + "', expected 'arch map'");
        }
 
        while (true) {
            final String line = reader.readLine();
            if (line == null) {
                throw new IOException("unexpected end of file in map header");
            }
 
            final Matcher matcher = KEY_VALUE_PATTERN.matcher(line);
            final String key;
            @Nullable final String value;
            if (matcher.matches()) {
                key = matcher.group(1);
                value = matcher.group(2);
            } else {
                key = line;
                value = "";
            }
 
            final String trimmedLine = StringUtils.removeTrailingWhitespace(line);
            if (!parseLine(trimmedLine, key, value, mapArchObject, reader)) {
                break;
            }
        }
    }
 
    protected abstract boolean parseLine(@NotNull String line, @NotNull String key, @NotNull String value, @NotNull A mapArchObject, @NotNull BufferedReader reader) throws IOException;
 
}