Connections.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.connectionview;
 
import java.util.regex.Pattern;
import net.sf.gridarta.model.baseobject.BaseObject;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class Connections {
 
    private static final Pattern PATTERN_VALUES = Pattern.compile("\\d+(, *\\d+)*");
 
    private static final Pattern PATTERN_VALUE_SEPARATOR = Pattern.compile(",\\s*");
 
    private Connections() {
    }
 
    public static int @Nullable [] parseConnections(@NotNull final BaseObject<?, ?, ?, ?> gameObject) {
        final String connectionSpec = gameObject.getAttributeString("connected", false);
        if (!PATTERN_VALUES.matcher(connectionSpec).matches()) {
            return null;
        }
 
        final String[] values = PATTERN_VALUE_SEPARATOR.split(connectionSpec.trim(), 0);
        final int[] result = new int[values.length];
        for (int i = 0; i < values.length; i++) {
            try {
                result[i] = Integer.valueOf(values[i]);
            } catch (final NumberFormatException ignore) {
                // just ignore invalid connection values; will be detected by a map validator
            }
        }
        return result;
    }
 
}