Arakne / Araknemu

 * This file is part of Araknemu.

 *

 * Araknemu is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * Araknemu 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2017-2020 Vincent Quatrevieux

 */

package fr.quatrevieux.araknemu.data.world.transformer;

import fr.arakne.utils.encoding.Base64;

import fr.quatrevieux.araknemu.data.transformer.Transformer;

import fr.quatrevieux.araknemu.data.transformer.TransformerException;

import fr.quatrevieux.araknemu.util.Asserter;

import org.apache.commons.lang3.StringUtils;

import org.checkerframework.checker.index.qual.NonNegative;

import org.checkerframework.checker.nullness.qual.PolyNull;

import java.util.Arrays;

/**

 * Transform map fight places

 */

public final class FightPlacesTransformer implements Transformer<@NonNegative int[][]> {

    @Override

    @SuppressWarnings("return") // returned values are non negative

    public @NonNegative int[][] unserialize(@PolyNull String serialize) {

        if (serialize == null) {

            return new int[0][];

        }

        try {

            return Arrays.stream(StringUtils.split(serialize, "|", 2))

                .map(this::parseTeamPlaces)

                .toArray(int[][]::new)

            ;

        } catch (RuntimeException e) {

            throw new TransformerException("Cannot parse places '" + serialize + "'", e);

        }

    }

    @SuppressWarnings("argument") // String indexes are safe

    private @NonNegative int[] parseTeamPlaces(String places) {

        final @NonNegative int[] cells = new int[places.length() / 2];

        for (int i = 0; i < cells.length; i++) {

            cells[i] = Asserter.assertNonNegative(Base64.decode(places.substring(2 * i, 2 * i + 2)));

        }

        return cells;

    }

}