minecraft-src/net/minecraft/world/level/block/LiquidBlock.java

package net.minecraft.world.level.block;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.mojang.serialization.Codec;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.registries.BuiltInRegistries;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.tags.FluidTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.block.state.properties.IntegerProperty;
import net.minecraft.world.level.material.FlowingFluid;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.pathfinder.PathComputationType;
import net.minecraft.world.level.storage.loot.LootParams;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;
import org.jetbrains.annotations.Nullable;

public class LiquidBlock extends Block implements BucketPickup {
	private static final Codec<FlowingFluid> FLOWING_FLUID = BuiltInRegistries.FLUID
		.byNameCodec()
		.comapFlatMap(
			fluid -> fluid instanceof FlowingFluid flowingFluid ? DataResult.success(flowingFluid) : DataResult.error(() -> "Not a flowing fluid: " + fluid),
			flowingFluid -> flowingFluid
		);
	public static final MapCodec<LiquidBlock> CODEC = RecordCodecBuilder.mapCodec(
		instance -> instance.group(FLOWING_FLUID.fieldOf("fluid").forGetter(liquidBlock -> liquidBlock.fluid), propertiesCodec()).apply(instance, LiquidBlock::new)
	);
	public static final IntegerProperty LEVEL = BlockStateProperties.LEVEL;
	protected final FlowingFluid fluid;
	private final List<FluidState> stateCache;
	public static final VoxelShape STABLE_SHAPE = Block.box(0.0, 0.0, 0.0, 16.0, 8.0, 16.0);
	public static final ImmutableList<Direction> POSSIBLE_FLOW_DIRECTIONS = ImmutableList.of(
		Direction.DOWN, Direction.SOUTH, Direction.NORTH, Direction.EAST, Direction.WEST
	);

	@Override
	public MapCodec<LiquidBlock> codec() {
		return CODEC;
	}

	protected LiquidBlock(FlowingFluid fluid, BlockBehaviour.Properties properties) {
		super(properties);
		this.fluid = fluid;
		this.stateCache = Lists.<FluidState>newArrayList();
		this.stateCache.add(fluid.getSource(false));

		for (int i = 1; i < 8; i++) {
			this.stateCache.add(fluid.getFlowing(8 - i, false));
		}

		this.stateCache.add(fluid.getFlowing(8, true));
		this.registerDefaultState(this.stateDefinition.any().setValue(LEVEL, 0));
	}

	@Override
	protected VoxelShape getCollisionShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		return context.isAbove(STABLE_SHAPE, pos, true)
				&& state.getValue(LEVEL) == 0
				&& context.canStandOnFluid(level.getFluidState(pos.above()), state.getFluidState())
			? STABLE_SHAPE
			: Shapes.empty();
	}

	@Override
	protected boolean isRandomlyTicking(BlockState state) {
		return state.getFluidState().isRandomlyTicking();
	}

	@Override
	protected void randomTick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		state.getFluidState().randomTick(level, pos, random);
	}

	@Override
	protected boolean propagatesSkylightDown(BlockState state, BlockGetter level, BlockPos pos) {
		return false;
	}

	@Override
	protected boolean isPathfindable(BlockState state, PathComputationType pathComputationType) {
		return !this.fluid.is(FluidTags.LAVA);
	}

	@Override
	protected FluidState getFluidState(BlockState state) {
		int i = (Integer)state.getValue(LEVEL);
		return (FluidState)this.stateCache.get(Math.min(i, 8));
	}

	@Override
	protected boolean skipRendering(BlockState state, BlockState adjacentState, Direction direction) {
		return adjacentState.getFluidState().getType().isSame(this.fluid);
	}

	@Override
	protected RenderShape getRenderShape(BlockState state) {
		return RenderShape.INVISIBLE;
	}

	@Override
	protected List<ItemStack> getDrops(BlockState state, LootParams.Builder params) {
		return Collections.emptyList();
	}

	@Override
	protected VoxelShape getShape(BlockState state, BlockGetter level, BlockPos pos, CollisionContext context) {
		return Shapes.empty();
	}

	@Override
	protected void onPlace(BlockState state, Level level, BlockPos pos, BlockState oldState, boolean movedByPiston) {
		if (this.shouldSpreadLiquid(level, pos, state)) {
			level.scheduleTick(pos, state.getFluidState().getType(), this.fluid.getTickDelay(level));
		}
	}

	@Override
	protected BlockState updateShape(BlockState state, Direction direction, BlockState neighborState, LevelAccessor level, BlockPos pos, BlockPos neighborPos) {
		if (state.getFluidState().isSource() || neighborState.getFluidState().isSource()) {
			level.scheduleTick(pos, state.getFluidState().getType(), this.fluid.getTickDelay(level));
		}

		return super.updateShape(state, direction, neighborState, level, pos, neighborPos);
	}

	@Override
	protected void neighborChanged(BlockState state, Level level, BlockPos pos, Block neighborBlock, BlockPos neighborPos, boolean movedByPiston) {
		if (this.shouldSpreadLiquid(level, pos, state)) {
			level.scheduleTick(pos, state.getFluidState().getType(), this.fluid.getTickDelay(level));
		}
	}

	private boolean shouldSpreadLiquid(Level level, BlockPos pos, BlockState state) {
		if (this.fluid.is(FluidTags.LAVA)) {
			boolean bl = level.getBlockState(pos.below()).is(Blocks.SOUL_SOIL);

			for (Direction direction : POSSIBLE_FLOW_DIRECTIONS) {
				BlockPos blockPos = pos.relative(direction.getOpposite());
				if (level.getFluidState(blockPos).is(FluidTags.WATER)) {
					Block block = level.getFluidState(pos).isSource() ? Blocks.OBSIDIAN : Blocks.COBBLESTONE;
					level.setBlockAndUpdate(pos, block.defaultBlockState());
					this.fizz(level, pos);
					return false;
				}

				if (bl && level.getBlockState(blockPos).is(Blocks.BLUE_ICE)) {
					level.setBlockAndUpdate(pos, Blocks.BASALT.defaultBlockState());
					this.fizz(level, pos);
					return false;
				}
			}
		}

		return true;
	}

	private void fizz(LevelAccessor level, BlockPos pos) {
		level.levelEvent(1501, pos, 0);
	}

	@Override
	protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {
		builder.add(LEVEL);
	}

	@Override
	public ItemStack pickupBlock(@Nullable Player player, LevelAccessor level, BlockPos pos, BlockState state) {
		if ((Integer)state.getValue(LEVEL) == 0) {
			level.setBlock(pos, Blocks.AIR.defaultBlockState(), 11);
			return new ItemStack(this.fluid.getBucket());
		} else {
			return ItemStack.EMPTY;
		}
	}

	@Override
	public Optional<SoundEvent> getPickupSound() {
		return this.fluid.getPickupSound();
	}
}