cn.nukkit.block.BlockPistonBase Maven / Gradle / Ivy
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A Minecraft Bedrock Edition server software implementation made in Java from scratch which supports all new features.
package cn.nukkit.block;
import cn.nukkit.Player;
import cn.nukkit.api.PowerNukkitDifference;
import cn.nukkit.api.PowerNukkitOnly;
import cn.nukkit.api.Since;
import cn.nukkit.blockentity.BlockEntity;
import cn.nukkit.blockentity.BlockEntityMovingBlock;
import cn.nukkit.blockentity.BlockEntityPistonArm;
import cn.nukkit.blockstate.BlockState;
import cn.nukkit.blockstate.BlockStateRegistry;
import cn.nukkit.event.block.BlockPistonEvent;
import cn.nukkit.item.Item;
import cn.nukkit.item.ItemBlock;
import cn.nukkit.level.Level;
import cn.nukkit.level.Sound;
import cn.nukkit.math.BlockFace;
import cn.nukkit.math.BlockVector3;
import cn.nukkit.math.Vector3;
import cn.nukkit.nbt.tag.CompoundTag;
import cn.nukkit.utils.Faceable;
import cn.nukkit.utils.RedstoneComponent;
import com.google.common.collect.Lists;
import lombok.extern.log4j.Log4j2;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
/**
* @author CreeperFace
*/
@PowerNukkitDifference(info = "Implements RedstoneComponent.", since = "1.4.0.0-PN")
@PowerNukkitDifference(since = "1.4.0.0-PN", info = "Implements BlockEntityHolder only in PowerNukkit")
@Log4j2
public abstract class BlockPistonBase extends BlockSolidMeta implements RedstoneComponent, Faceable, BlockEntityHolder {
public boolean sticky;
public BlockPistonBase() {
this(0);
}
public BlockPistonBase(int meta) {
super(meta);
}
@PowerNukkitOnly
@Since("1.4.0.0-PN")
@Nonnull
@Override
public String getBlockEntityType() {
return BlockEntity.PISTON_ARM;
}
@Since("1.4.0.0-PN")
@PowerNukkitOnly
@Nonnull
@Override
public Class getBlockEntityClass() {
return BlockEntityPistonArm.class;
}
@Override
public double getResistance() {
return 2.5;
}
@Override
public double getHardness() {
return 0.5;
}
@PowerNukkitOnly
@Override
public int getWaterloggingLevel() {
return 1;
}
@Override
@PowerNukkitDifference(info = "Using new method for checking if powered", since = "1.4.0.0-PN")
public boolean place(@Nonnull Item item, @Nonnull Block block, @Nonnull Block target, @Nonnull BlockFace face, double fx, double fy, double fz, @Nullable Player player) {
if (player != null) {
if (Math.abs(player.getFloorX() - this.x) <= 1 && Math.abs(player.getFloorZ() - this.z) <= 1) {
double y = player.y + player.getEyeHeight();
if (y - this.y > 2) {
this.setDamage(BlockFace.UP.getIndex());
} else if (this.y - y > 0) {
this.setDamage(BlockFace.DOWN.getIndex());
} else {
this.setDamage(player.getHorizontalFacing().getIndex());
}
} else {
this.setDamage(player.getHorizontalFacing().getIndex());
}
}
if(this.level.getBlockEntity(this) != null) {
BlockEntity blockEntity = this.level.getBlockEntity(this);
log.warn("Found unused BlockEntity at world={} x={} y={} z={} whilst attempting to place piston, closing it.", blockEntity.getLevel().getName(), blockEntity.getX(), blockEntity.getY(), blockEntity.getZ());
blockEntity.saveNBT();
blockEntity.close();
}
CompoundTag nbt = new CompoundTag()
.putInt("facing", this.getBlockFace().getIndex())
.putBoolean("Sticky", this.sticky)
.putBoolean("powered", isGettingPower());
BlockEntityPistonArm piston = BlockEntityHolder.setBlockAndCreateEntity(this, true, true, nbt);
if (piston == null) {
return false;
}
this.checkState(piston.powered);
return true;
}
@Override
public boolean onBreak(Item item) {
this.level.setBlock(this, new BlockAir(), true, true);
Block block = this.getSide(getBlockFace());
if (block instanceof BlockPistonHead && ((BlockPistonHead) block).getBlockFace() == this.getBlockFace()) {
block.onBreak(item);
}
return true;
}
public boolean isExtended() {
BlockFace face = getBlockFace();
Block block = getSide(face);
return block instanceof BlockPistonHead && ((BlockPistonHead) block).getBlockFace() == face;
}
@Override
@PowerNukkitDifference(info = "Using new method for checking if powered + update all around redstone torches, " +
"even if the piston can't move.", since = "1.4.0.0-PN")
public int onUpdate(int type) {
if (type != Level.BLOCK_UPDATE_NORMAL && type != Level.BLOCK_UPDATE_REDSTONE && type != Level.BLOCK_UPDATE_SCHEDULED) {
return 0;
} else {
if (!this.level.getServer().isRedstoneEnabled()) {
return 0;
}
// We can't use getOrCreateBlockEntity(), because the update method is called on block place,
// before the "real" BlockEntity is set. That means, if we'd use the other method here,
// it would create two BlockEntities.
BlockEntityPistonArm arm = this.getBlockEntity();
boolean powered = this.isGettingPower();
this.updateAroundRedstoneTorches(powered);
if (arm == null || !arm.finished)
return 0;
if (arm.state % 2 == 0 && arm.powered != powered && checkState(powered)) {
arm.powered = powered;
if (arm.chunk != null) {
arm.chunk.setChanged();
}
}
return type;
}
}
private void updateAroundRedstoneTorches(boolean powered) {
for (BlockFace side : BlockFace.values()) {
if ((getSide(side) instanceof BlockRedstoneTorch && powered)
|| (getSide(side) instanceof BlockRedstoneTorchUnlit && !powered)) {
BlockTorch torch = (BlockTorch) getSide(side);
BlockTorch.TorchAttachment torchAttachment = torch.getTorchAttachment();
Block support = torch.getSide(torchAttachment.getAttachedFace());
if (support.getLocation().equals(this.getLocation())) {
torch.onUpdate(Level.BLOCK_UPDATE_REDSTONE);
}
}
}
}
private boolean checkState(Boolean isPowered) {
if (!this.level.getServer().isRedstoneEnabled()) {
return false;
}
if (isPowered == null) {
isPowered = this.isGettingPower();
}
if (isPowered && !isExtended()) {
if (!this.doMove(true)) {
return false;
}
this.getLevel().addSound(this, Sound.TILE_PISTON_OUT);
return true;
} else if (!isPowered && isExtended()) {
if (!this.doMove(false)) {
return false;
}
this.getLevel().addSound(this, Sound.TILE_PISTON_IN);
return true;
}
return false;
}
@PowerNukkitOnly
@Since("1.4.0.0-PN")
@Override
public boolean isGettingPower() {
BlockFace face = getBlockFace();
for (BlockFace side : BlockFace.values()) {
if (side == face) {
continue;
}
Block b = this.getSide(side);
if (b.getId() == Block.REDSTONE_WIRE && b.getDamage() > 0 && b.y >= this.getY()) {
return true;
}
if (this.level.isSidePowered(b, side)) {
return true;
}
}
return false;
}
private boolean doMove(boolean extending) {
BlockFace direction = getBlockFace();
BlocksCalculator calculator = new BlocksCalculator(level, this, getBlockFace(), extending, sticky);
boolean canMove = calculator.canMove();
if (!canMove && extending) {
return false;
}
List attached = Collections.emptyList();
BlockPistonEvent event = new BlockPistonEvent(this, direction, calculator.getBlocksToMove(), calculator.getBlocksToDestroy(), extending);
this.level.getServer().getPluginManager().callEvent(event);
if (event.isCancelled()) {
return false;
}
if (canMove && (this.sticky || extending)) {
List destroyBlocks = calculator.getBlocksToDestroy();
for (int i = destroyBlocks.size() - 1; i >= 0; --i) {
Block block = destroyBlocks.get(i);
this.level.useBreakOn(block, null, null, false);
}
List newBlocks = calculator.getBlocksToMove();
attached = newBlocks.stream().map(Vector3::asBlockVector3).collect(Collectors.toList());
BlockFace side = extending ? direction : direction.getOpposite();
List tags = new ArrayList<>();
for (Block oldBlock : newBlocks) {
CompoundTag tag = new CompoundTag();
BlockEntity be = this.level.getBlockEntity(oldBlock);
if (be != null && !(be instanceof BlockEntityMovingBlock)) {
be.saveNBT();
tag = new CompoundTag(be.namedTag.getTags());
be.close();
}
tags.add(tag);
}
int i = 0;
for (Block newBlock : newBlocks) {
Vector3 oldPos = newBlock.add(0);
newBlock.position(newBlock.add(0).getSide(side));
CompoundTag nbt = new CompoundTag()
.putInt("pistonPosX", this.getFloorX())
.putInt("pistonPosY", this.getFloorY())
.putInt("pistonPosZ", this.getFloorZ())
.putCompound("movingBlock", new CompoundTag()
.putInt("id", newBlock.getId()) //only for nukkit purpose
.putInt("meta", newBlock.getDamage()) //only for nukkit purpose
.putShort("val", newBlock.getDamage())
.putString("name", BlockStateRegistry.getPersistenceName(newBlock.getId()))
);
if (!tags.get(i).isEmpty()) {
nbt.putCompound("movingEntity", tags.get(i));
}
BlockEntityHolder.setBlockAndCreateEntity((BlockEntityHolder) BlockState.of(BlockID.MOVING_BLOCK).getBlock(newBlock),
true, true, nbt);
if (this.level.getBlockIdAt(oldPos.getFloorX(), oldPos.getFloorY(), oldPos.getFloorZ()) != BlockID.MOVING_BLOCK) {
this.level.setBlock(oldPos, Block.get(BlockID.AIR));
}
i++;
}
}
if (extending) {
this.level.setBlock(this.getSide(direction), createHead(this.getDamage()));
}
BlockEntityPistonArm blockEntity = getOrCreateBlockEntity();
blockEntity.move(extending, attached);
return true;
}
protected BlockPistonHead createHead(int damage) {
return (BlockPistonHead) Block.get(getPistonHeadBlockId(), damage);
}
public abstract int getPistonHeadBlockId();
public static boolean canPush(Block block, BlockFace face, boolean destroyBlocks, boolean extending) {
if (
block.getY() >= 0 && (face != BlockFace.DOWN || block.getY() != 0) &&
block.getY() <= 255 && (face != BlockFace.UP || block.getY() != 255)
) {
if (extending && !block.canBePushed() || !extending && !block.canBePulled()) {
return false;
}
if (block.breaksWhenMoved()) {
return destroyBlocks || block.sticksToPiston();
}
BlockEntity be = block.level.getBlockEntity(block);
return be == null || be.isMovable();
}
return false;
}
public class BlocksCalculator {
private final Vector3 pistonPos;
private Vector3 armPos;
private final Block blockToMove;
private final BlockFace moveDirection;
private final boolean extending;
private final boolean sticky;
private final List toMove = new ArrayList<>();
private final List toDestroy = new ArrayList<>();
/**
* @param level Unused, needed for compatibility with Cloudburst Nukkit plugins
*/
public BlocksCalculator(Level level, Block block, BlockFace facing, boolean extending) {
this(level, block, facing, extending, false);
}
/**
* @param level Unused, needed for compatibility with Cloudburst Nukkit plugins
*/
@PowerNukkitOnly
@Since("1.4.0.0-PN")
public BlocksCalculator(Level level, Block pos, BlockFace face, boolean extending, boolean sticky) {
this.pistonPos = pos.getLocation();
this.extending = extending;
this.sticky = sticky;
if (!extending) {
this.armPos = pistonPos.getSide(face);
}
if (extending) {
this.moveDirection = face;
this.blockToMove = pos.getSide(face);
} else {
this.moveDirection = face.getOpposite();
if (sticky) {
this.blockToMove = pos.getSide(face, 2);
} else {
this.blockToMove = null;
}
}
}
public boolean canMove() {
if (!sticky && !extending) {
return true;
}
this.toMove.clear();
this.toDestroy.clear();
Block block = this.blockToMove;
if (!canPush(block, this.moveDirection, true, extending)) {
return false;
}
if (block.breaksWhenMoved()) {
if (extending || block.sticksToPiston()) {
this.toDestroy.add(this.blockToMove);
}
return true;
}
if (!this.addBlockLine(this.blockToMove, this.blockToMove.getSide(this.moveDirection.getOpposite()), true)) {
return false;
}
for (int i = 0; i < this.toMove.size(); ++i) {
Block b = this.toMove.get(i);
int blockId = b.getId();
if ((blockId == SLIME_BLOCK || blockId == HONEY_BLOCK) && !this.addBranchingBlocks(b)) {
return false;
}
}
return true;
}
private boolean addBlockLine(Block origin, Block from, boolean mainBlockLine) {
Block block = origin.clone();
if (block.getId() == AIR) {
return true;
}
if (!mainBlockLine && (block.getId() == SLIME_BLOCK && from.getId() == HONEY_BLOCK
|| block.getId() == HONEY_BLOCK && from.getId() == SLIME_BLOCK)) {
return true;
}
if (!canPush(origin, this.moveDirection, false, extending)) {
return true;
}
if (origin.equals(this.pistonPos)) {
return true;
}
if (this.toMove.contains(origin)) {
return true;
}
if (this.toMove.size() >= 12) {
return false;
}
this.toMove.add(block);
int count = 1;
List sticked = new ArrayList<>();
while (block.getId() == SLIME_BLOCK || block.getId() == HONEY_BLOCK) {
Block oldBlock = block.clone();
block = origin.getSide(this.moveDirection.getOpposite(), count);
if (!extending && (block.getId() == SLIME_BLOCK && oldBlock.getId() == HONEY_BLOCK
|| block.getId() == HONEY_BLOCK && oldBlock.getId() == SLIME_BLOCK)) {
break;
}
if (block.getId() == AIR || !canPush(block, this.moveDirection, false, extending) || block.equals(this.pistonPos)) {
break;
}
if (block.breaksWhenMoved() && block.sticksToPiston()) {
this.toDestroy.add(block);
break;
}
if (count + this.toMove.size() > 12) {
return false;
}
count++;
sticked.add(block);
}
int stickedCount = sticked.size();
if (stickedCount > 0) {
this.toMove.addAll(Lists.reverse(sticked));
}
int step = 1;
while (true) {
Block nextBlock = origin.getSide(this.moveDirection, step);
int index = this.toMove.indexOf(nextBlock);
if (index > -1) {
this.reorderListAtCollision(stickedCount, index);
for (int i = 0; i <= index + stickedCount; ++i) {
Block b = this.toMove.get(i);
if ((b.getId() == SLIME_BLOCK || b.getId() == HONEY_BLOCK) && !this.addBranchingBlocks(b)) {
return false;
}
}
return true;
}
if (nextBlock.getId() == AIR || nextBlock.equals(armPos)) {
return true;
}
if (!canPush(nextBlock, this.moveDirection, true, extending) || nextBlock.equals(this.pistonPos)) {
return false;
}
if (nextBlock.breaksWhenMoved()) {
this.toDestroy.add(nextBlock);
return true;
}
if (this.toMove.size() >= 12) {
return false;
}
this.toMove.add(nextBlock);
++stickedCount;
++step;
}
}
private void reorderListAtCollision(int count, int index) {
List list = new ArrayList<>(this.toMove.subList(0, index));
List list1 = new ArrayList<>(this.toMove.subList(this.toMove.size() - count, this.toMove.size()));
List list2 = new ArrayList<>(this.toMove.subList(index, this.toMove.size() - count));
this.toMove.clear();
this.toMove.addAll(list);
this.toMove.addAll(list1);
this.toMove.addAll(list2);
}
private boolean addBranchingBlocks(Block block) {
for (BlockFace face : BlockFace.values()) {
if (face.getAxis() != this.moveDirection.getAxis() && !this.addBlockLine(block.getSide(face), block, false)) {
return false;
}
}
return true;
}
public List getBlocksToMove() {
return this.toMove;
}
public List getBlocksToDestroy() {
return this.toDestroy;
}
}
@Override
public Item toItem() {
return new ItemBlock(this, 0);
}
@Override
public BlockFace getBlockFace() {
BlockFace face = BlockFace.fromIndex(this.getDamage());
return face.getHorizontalIndex() >= 0 ? face.getOpposite() : face;
}
}