WorldMapFactory

package com.ninjacave.rabrg.map;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public final class WorldMapFactory {

    public static WorldMap createMap(final String directory) throws IOException {
        return createMap(new File(directory));
    }

    public static WorldMap createMap(final File directory) throws IOException {
        try (final RandomAccessFile file = new RandomAccessFile(directory, "r"); final FileChannel channel = file.getChannel()) {
            final MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
            final int width = buffer.getShort();
            final int height = buffer.getShort();
            final int[][] map = new int[width][height];
            for (int offset = 0; offset < buffer.remaining(); offset++) {
                map[offset / width][offset % width] = buffer.getShort();
            }
            return createMap(map);
        }
    }

    public static WorldMap createMap(final int[][] map) {
        return new WorldMap(map);
    }
}