Code/net/minecraft/world/level/block/LadderBlock.java

package net.minecraft.world.level.block;

import com.mojang.serialization.MapCodec;
import java.util.Map;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.util.RandomSource;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.ScheduledTickAccess;
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.BooleanProperty;
import net.minecraft.world.level.block.state.properties.EnumProperty;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;

public class LadderBlock extends Block implements SimpleWaterloggedBlock {
    public static final MapCodec<LadderBlock> CODEC = simpleCodec(LadderBlock::new);
    public static final EnumProperty<Direction> FACING = HorizontalDirectionalBlock.FACING;
    public static final BooleanProperty WATERLOGGED = BlockStateProperties.WATERLOGGED;
    public static final Map<Direction, VoxelShape> SHAPES = Shapes.rotateHorizontal(Block.boxZ(16.0, 13.0, 16.0));

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

    protected LadderBlock(BlockBehaviour.Properties p_54345_) {
        super(p_54345_);
        this.registerDefaultState(this.stateDefinition.any().setValue(FACING, Direction.NORTH).setValue(WATERLOGGED, false));
    }

    @Override
    protected VoxelShape getShape(BlockState p_54372_, BlockGetter p_54373_, BlockPos p_54374_, CollisionContext p_54375_) {
        return SHAPES.get(p_54372_.getValue(FACING));
    }

    private boolean canAttachTo(BlockGetter p_54349_, BlockPos p_54350_, Direction p_54351_) {
        BlockState blockstate = p_54349_.getBlockState(p_54350_);
        return blockstate.isFaceSturdy(p_54349_, p_54350_, p_54351_);
    }

    @Override
    protected boolean canSurvive(BlockState p_54353_, LevelReader p_54354_, BlockPos p_54355_) {
        Direction direction = p_54353_.getValue(FACING);
        return this.canAttachTo(p_54354_, p_54355_.relative(direction.getOpposite()), direction);
    }

    @Override
    protected BlockState updateShape(
        BlockState p_54363_,
        LevelReader p_363162_,
        ScheduledTickAccess p_369244_,
        BlockPos p_54367_,
        Direction p_54364_,
        BlockPos p_54368_,
        BlockState p_54365_,
        RandomSource p_368750_
    ) {
        if (p_54364_.getOpposite() == p_54363_.getValue(FACING) && !p_54363_.canSurvive(p_363162_, p_54367_)) {
            return Blocks.AIR.defaultBlockState();
        } else {
            if (p_54363_.getValue(WATERLOGGED)) {
                p_369244_.scheduleTick(p_54367_, Fluids.WATER, Fluids.WATER.getTickDelay(p_363162_));
            }

            return super.updateShape(p_54363_, p_363162_, p_369244_, p_54367_, p_54364_, p_54368_, p_54365_, p_368750_);
        }
    }

    @Nullable
    @Override
    public BlockState getStateForPlacement(BlockPlaceContext p_54347_) {
        if (!p_54347_.replacingClickedOnBlock()) {
            BlockState blockstate = p_54347_.getLevel().getBlockState(p_54347_.getClickedPos().relative(p_54347_.getClickedFace().getOpposite()));
            if (blockstate.is(this) && blockstate.getValue(FACING) == p_54347_.getClickedFace()) {
                return null;
            }
        }

        BlockState blockstate1 = this.defaultBlockState();
        LevelReader levelreader = p_54347_.getLevel();
        BlockPos blockpos = p_54347_.getClickedPos();
        FluidState fluidstate = p_54347_.getLevel().getFluidState(p_54347_.getClickedPos());

        for (Direction direction : p_54347_.getNearestLookingDirections()) {
            if (direction.getAxis().isHorizontal()) {
                blockstate1 = blockstate1.setValue(FACING, direction.getOpposite());
                if (blockstate1.canSurvive(levelreader, blockpos)) {
                    return blockstate1.setValue(WATERLOGGED, fluidstate.getType() == Fluids.WATER);
                }
            }
        }

        return null;
    }

    @Override
    protected BlockState rotate(BlockState p_54360_, Rotation p_54361_) {
        return p_54360_.setValue(FACING, p_54361_.rotate(p_54360_.getValue(FACING)));
    }

    @Override
    protected BlockState mirror(BlockState p_54357_, Mirror p_54358_) {
        return p_54357_.rotate(p_54358_.getRotation(p_54357_.getValue(FACING)));
    }

    @Override
    protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> p_54370_) {
        p_54370_.add(FACING, WATERLOGGED);
    }

    @Override
    protected FluidState getFluidState(BlockState p_54377_) {
        return p_54377_.getValue(WATERLOGGED) ? Fluids.WATER.getSource(false) : super.getFluidState(p_54377_);
    }
}