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

package net.minecraft.world.level.block;

import com.mojang.logging.LogUtils;
import com.mojang.serialization.MapCodec;
import java.util.IdentityHashMap;
import java.util.Map;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.Position;
import net.minecraft.core.component.DataComponents;
import net.minecraft.core.dispenser.BlockSource;
import net.minecraft.core.dispenser.DefaultDispenseItemBehavior;
import net.minecraft.core.dispenser.DispenseItemBehavior;
import net.minecraft.core.dispenser.EquipmentDispenseItemBehavior;
import net.minecraft.core.dispenser.ProjectileDispenseBehavior;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.stats.Stats;
import net.minecraft.util.RandomSource;
import net.minecraft.world.Containers;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.inventory.AbstractContainerMenu;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.context.BlockPlaceContext;
import net.minecraft.world.level.ItemLike;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.entity.BlockEntityType;
import net.minecraft.world.level.block.entity.DispenserBlockEntity;
import net.minecraft.world.level.block.entity.DropperBlockEntity;
import net.minecraft.world.level.block.state.BlockBehaviour;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.StateDefinition.Builder;
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.gameevent.GameEvent;
import net.minecraft.world.level.gameevent.GameEvent.Context;
import net.minecraft.world.level.redstone.Orientation;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.Vec3;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;

public class DispenserBlock extends BaseEntityBlock {
	private static final Logger LOGGER = LogUtils.getLogger();
	public static final MapCodec<DispenserBlock> CODEC = simpleCodec(DispenserBlock::new);
	public static final EnumProperty<Direction> FACING = DirectionalBlock.FACING;
	public static final BooleanProperty TRIGGERED = BlockStateProperties.TRIGGERED;
	private static final DefaultDispenseItemBehavior DEFAULT_BEHAVIOR = new DefaultDispenseItemBehavior();
	/**
	 * Registry for all dispense behaviors.
	 */
	public static final Map<Item, DispenseItemBehavior> DISPENSER_REGISTRY = new IdentityHashMap();
	private static final int TRIGGER_DURATION = 4;

	@Override
	public MapCodec<? extends DispenserBlock> codec() {
		return CODEC;
	}

	public static void registerBehavior(ItemLike item, DispenseItemBehavior behavior) {
		DISPENSER_REGISTRY.put(item.asItem(), behavior);
	}

	public static void registerProjectileBehavior(ItemLike item) {
		DISPENSER_REGISTRY.put(item.asItem(), new ProjectileDispenseBehavior(item.asItem()));
	}

	protected DispenserBlock(BlockBehaviour.Properties properties) {
		super(properties);
		this.registerDefaultState(this.stateDefinition.any().setValue(FACING, Direction.NORTH).setValue(TRIGGERED, false));
	}

	@Override
	protected InteractionResult useWithoutItem(BlockState state, Level level, BlockPos pos, Player player, BlockHitResult hitResult) {
		if (!level.isClientSide && level.getBlockEntity(pos) instanceof DispenserBlockEntity dispenserBlockEntity) {
			player.openMenu(dispenserBlockEntity);
			player.awardStat(dispenserBlockEntity instanceof DropperBlockEntity ? Stats.INSPECT_DROPPER : Stats.INSPECT_DISPENSER);
		}

		return InteractionResult.SUCCESS;
	}

	protected void dispenseFrom(ServerLevel level, BlockState state, BlockPos pos) {
		DispenserBlockEntity dispenserBlockEntity = (DispenserBlockEntity)level.getBlockEntity(pos, BlockEntityType.DISPENSER).orElse(null);
		if (dispenserBlockEntity == null) {
			LOGGER.warn("Ignoring dispensing attempt for Dispenser without matching block entity at {}", pos);
		} else {
			BlockSource blockSource = new BlockSource(level, pos, state, dispenserBlockEntity);
			int i = dispenserBlockEntity.getRandomSlot(level.random);
			if (i < 0) {
				level.levelEvent(1001, pos, 0);
				level.gameEvent(GameEvent.BLOCK_ACTIVATE, pos, Context.of(dispenserBlockEntity.getBlockState()));
			} else {
				ItemStack itemStack = dispenserBlockEntity.getItem(i);
				DispenseItemBehavior dispenseItemBehavior = this.getDispenseMethod(level, itemStack);
				if (dispenseItemBehavior != DispenseItemBehavior.NOOP) {
					dispenserBlockEntity.setItem(i, dispenseItemBehavior.dispense(blockSource, itemStack));
				}
			}
		}
	}

	protected DispenseItemBehavior getDispenseMethod(Level level, ItemStack item) {
		if (!item.isItemEnabled(level.enabledFeatures())) {
			return DEFAULT_BEHAVIOR;
		} else {
			DispenseItemBehavior dispenseItemBehavior = (DispenseItemBehavior)DISPENSER_REGISTRY.get(item.getItem());
			return dispenseItemBehavior != null ? dispenseItemBehavior : getDefaultDispenseMethod(item);
		}
	}

	private static DispenseItemBehavior getDefaultDispenseMethod(ItemStack stack) {
		return (DispenseItemBehavior)(stack.has(DataComponents.EQUIPPABLE) ? EquipmentDispenseItemBehavior.INSTANCE : DEFAULT_BEHAVIOR);
	}

	@Override
	protected void neighborChanged(BlockState state, Level level, BlockPos pos, Block neighborBlock, @Nullable Orientation orientation, boolean movedByPiston) {
		boolean bl = level.hasNeighborSignal(pos) || level.hasNeighborSignal(pos.above());
		boolean bl2 = (Boolean)state.getValue(TRIGGERED);
		if (bl && !bl2) {
			level.scheduleTick(pos, this, 4);
			level.setBlock(pos, state.setValue(TRIGGERED, true), 2);
		} else if (!bl && bl2) {
			level.setBlock(pos, state.setValue(TRIGGERED, false), 2);
		}
	}

	@Override
	protected void tick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
		this.dispenseFrom(level, state, pos);
	}

	@Override
	public BlockEntity newBlockEntity(BlockPos pos, BlockState state) {
		return new DispenserBlockEntity(pos, state);
	}

	@Override
	public BlockState getStateForPlacement(BlockPlaceContext context) {
		return this.defaultBlockState().setValue(FACING, context.getNearestLookingDirection().getOpposite());
	}

	@Override
	protected void affectNeighborsAfterRemoval(BlockState state, ServerLevel level, BlockPos pos, boolean movedByPiston) {
		Containers.updateNeighboursAfterDestroy(state, level, pos);
	}

	public static Position getDispensePosition(BlockSource blockSource) {
		return getDispensePosition(blockSource, 0.7, Vec3.ZERO);
	}

	public static Position getDispensePosition(BlockSource blockSource, double multiplier, Vec3 offset) {
		Direction direction = blockSource.state().getValue(FACING);
		return blockSource.center()
			.add(multiplier * direction.getStepX() + offset.x(), multiplier * direction.getStepY() + offset.y(), multiplier * direction.getStepZ() + offset.z());
	}

	@Override
	protected boolean hasAnalogOutputSignal(BlockState state) {
		return true;
	}

	@Override
	protected int getAnalogOutputSignal(BlockState state, Level level, BlockPos pos) {
		return AbstractContainerMenu.getRedstoneSignalFromBlockEntity(level.getBlockEntity(pos));
	}

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

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

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