ch.fritteli.maze.generator.serialization.v2.SerializerDeserializerV2 Maven / Gradle / Ivy

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package ch.fritteli.maze.generator.serialization.v2;

import ch.fritteli.maze.generator.model.Maze;
import ch.fritteli.maze.generator.model.Position;
import ch.fritteli.maze.generator.model.Tile;
import lombok.experimental.UtilityClass;
import org.jetbrains.annotations.NotNull;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

/**
 * Header bytes are:
 *  *   byte  hex meaning
 *     00 0x1a magic
 *     01 0xb1 magic
 *     02 0x02 version (0x00 -> dev, 0x01 -> deprecated, 0x02 -> stable)
 *     03..06  width (int)
 *     07..10  height (int)
 *     11..14  start-x (int)
 *     15..18  start-y (int)
 *     19..22  end-x (int)
 *     23..26  end-y (int)
 *     27..34  random seed number (long)
 *     35..    tiles
 * 
 * Extraneous space (poss. last nibble) is ignored.
 */
@UtilityClass
public class SerializerDeserializerV2 {
    public final byte VERSION_BYTE = 0x02;

    /**
     * Serializes the {@code maze} into a byte array.
     *
     * @param maze The {@link Maze} to be serialized.
     * @return The resulting byte array.
     */
    @NotNull
    public byte[] serialize(@NotNull final Maze maze) {
        final MazeOutputStreamV2 stream = new MazeOutputStreamV2();
        stream.writeHeader();
        stream.writeMazeData(maze);
        return stream.toByteArray();
    }

    /**
     * Deserializes the byte array into an instance of {@link Maze}.
     *
     * @param bytes The byte array to be deserialized.
     * @return An instance of {@link Maze}.
     */
    @NotNull
    public Maze deserialize(@NotNull final byte[] bytes) {
        final MazeInputStreamV2 stream = new MazeInputStreamV2(bytes);
        stream.checkHeader();
        return stream.readMazeData();
    }

    @NotNull
    Maze createMaze(@NotNull final Tile[][] field, final int width, final int height, @NotNull final Position start, @NotNull final Position end, final long randomSeed) {
        try {
            final Constructor constructor = Maze.class.getDeclaredConstructor(Tile[][].class, Integer.TYPE, Integer.TYPE, Position.class, Position.class, Long.TYPE);
            constructor.setAccessible(true);
            return constructor.newInstance(field, width, height, start, end, randomSeed);
        } catch (@NotNull final NoSuchMethodException | IllegalAccessException | InstantiationException |
                                InvocationTargetException e) {
            throw new RuntimeException("Can not deserialize Maze from maze data.", e);
        }
    }
}