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A Minecraft Bedrock Edition server software implementation made in Java from scratch which supports all new features.

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package cn.nukkit.utils;

import cn.nukkit.api.API;
import cn.nukkit.block.Block;
import cn.nukkit.math.BlockFace;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;

import static cn.nukkit.math.BlockFace.*;
import static cn.nukkit.utils.Rail.Orientation.State.*;

/**
 * INTERNAL helper class of railway
 * 

* By lmlstarqaq http://snake1999.com/ * Creation time: 2017/7/1 17:42. */ @API(usage = API.Usage.BLEEDING, definition = API.Definition.INTERNAL) public final class Rail { public static boolean isRailBlock(Block block) { Objects.requireNonNull(block, "Rail block predicate can not accept null block"); return isRailBlock(block.getId()); } public enum Orientation { STRAIGHT_NORTH_SOUTH(0, STRAIGHT, NORTH, SOUTH, null), STRAIGHT_EAST_WEST(1, STRAIGHT, EAST, WEST, null), ASCENDING_EAST(2, ASCENDING, EAST, WEST, EAST), ASCENDING_WEST(3, ASCENDING, EAST, WEST, WEST), ASCENDING_NORTH(4, ASCENDING, NORTH, SOUTH, NORTH), ASCENDING_SOUTH(5, ASCENDING, NORTH, SOUTH, SOUTH), CURVED_SOUTH_EAST(6, CURVED, SOUTH, EAST, null), CURVED_SOUTH_WEST(7, CURVED, SOUTH, WEST, null), CURVED_NORTH_WEST(8, CURVED, NORTH, WEST, null), CURVED_NORTH_EAST(9, CURVED, NORTH, EAST, null); private static final Orientation[] META_LOOKUP = new Orientation[values().length]; private final int meta; private final State state; private final List connectingDirections; private final BlockFace ascendingDirection; Orientation(int meta, State state, BlockFace from, BlockFace to, BlockFace ascendingDirection) { this.meta = meta; this.state = state; this.connectingDirections = Arrays.asList(from, to); this.ascendingDirection = ascendingDirection; } public static Orientation byMetadata(int meta) { if (meta < 0 || meta >= META_LOOKUP.length) { meta = 0; } return META_LOOKUP[meta]; } public static Orientation straight(BlockFace face) { switch (face) { case NORTH: case SOUTH: return STRAIGHT_NORTH_SOUTH; case EAST: case WEST: return STRAIGHT_EAST_WEST; } return STRAIGHT_NORTH_SOUTH; } public static Orientation ascending(BlockFace face) { switch (face) { case NORTH: return ASCENDING_NORTH; case SOUTH: return ASCENDING_SOUTH; case EAST: return ASCENDING_EAST; case WEST: return ASCENDING_WEST; } return ASCENDING_EAST; } public static Orientation curved(BlockFace f1, BlockFace f2) { for (Orientation o : new Orientation[]{CURVED_SOUTH_EAST, CURVED_SOUTH_WEST, CURVED_NORTH_WEST, CURVED_NORTH_EAST}) { if (o.connectingDirections.contains(f1) && o.connectingDirections.contains(f2)) { return o; } } return CURVED_SOUTH_EAST; } public static Orientation straightOrCurved(BlockFace f1, BlockFace f2) { for (Orientation o : new Orientation[]{STRAIGHT_NORTH_SOUTH, STRAIGHT_EAST_WEST, CURVED_SOUTH_EAST, CURVED_SOUTH_WEST, CURVED_NORTH_WEST, CURVED_NORTH_EAST}) { if (o.connectingDirections.contains(f1) && o.connectingDirections.contains(f2)) { return o; } } return STRAIGHT_NORTH_SOUTH; } public int metadata() { return meta; } public boolean hasConnectingDirections(BlockFace... faces) { return Stream.of(faces).allMatch(connectingDirections::contains); } public List connectingDirections() { return connectingDirections; } public Optional ascendingDirection() { return Optional.ofNullable(ascendingDirection); } public enum State { STRAIGHT, ASCENDING, CURVED } public boolean isStraight() { return state == STRAIGHT; } public boolean isAscending() { return state == ASCENDING; } public boolean isCurved() { return state == CURVED; } static { for (Orientation o : values()) { META_LOOKUP[o.meta] = o; } } } public static boolean isRailBlock(int blockId) { switch (blockId) { case Block.RAIL: case Block.POWERED_RAIL: case Block.ACTIVATOR_RAIL: case Block.DETECTOR_RAIL: return true; default: return false; } } private Rail() { //no instance } }





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