Code/net/minecraft/world/entity/item/PrimedTnt.java

package net.minecraft.world.entity.item;

import java.util.Optional;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.particles.ParticleTypes;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.nbt.NbtOps;
import net.minecraft.nbt.Tag;
import net.minecraft.network.syncher.EntityDataAccessor;
import net.minecraft.network.syncher.EntityDataSerializers;
import net.minecraft.network.syncher.SynchedEntityData;
import net.minecraft.resources.RegistryOps;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.util.Mth;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.MoverType;
import net.minecraft.world.entity.TraceableEntity;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.Explosion;
import net.minecraft.world.level.ExplosionDamageCalculator;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.portal.TeleportTransition;

public class PrimedTnt extends Entity implements TraceableEntity {
    private static final EntityDataAccessor<Integer> DATA_FUSE_ID = SynchedEntityData.defineId(PrimedTnt.class, EntityDataSerializers.INT);
    private static final EntityDataAccessor<BlockState> DATA_BLOCK_STATE_ID = SynchedEntityData.defineId(PrimedTnt.class, EntityDataSerializers.BLOCK_STATE);
    private static final short DEFAULT_FUSE_TIME = 80;
    private static final float DEFAULT_EXPLOSION_POWER = 4.0F;
    private static final BlockState DEFAULT_BLOCK_STATE = Blocks.TNT.defaultBlockState();
    private static final String TAG_BLOCK_STATE = "block_state";
    public static final String TAG_FUSE = "fuse";
    private static final String TAG_EXPLOSION_POWER = "explosion_power";
    private static final ExplosionDamageCalculator USED_PORTAL_DAMAGE_CALCULATOR = new ExplosionDamageCalculator() {
        @Override
        public boolean shouldBlockExplode(Explosion p_345242_, BlockGetter p_343858_, BlockPos p_345073_, BlockState p_343662_, float p_344776_) {
            return p_343662_.is(Blocks.NETHER_PORTAL) ? false : super.shouldBlockExplode(p_345242_, p_343858_, p_345073_, p_343662_, p_344776_);
        }

        @Override
        public Optional<Float> getBlockExplosionResistance(Explosion p_342148_, BlockGetter p_342177_, BlockPos p_342771_, BlockState p_344877_, FluidState p_343569_) {
            return p_344877_.is(Blocks.NETHER_PORTAL) ? Optional.empty() : super.getBlockExplosionResistance(p_342148_, p_342177_, p_342771_, p_344877_, p_343569_);
        }
    };
    @Nullable
    private LivingEntity owner;
    private boolean usedPortal;
    private float explosionPower = 4.0F;

    public PrimedTnt(EntityType<? extends PrimedTnt> p_32076_, Level p_32077_) {
        super(p_32076_, p_32077_);
        this.blocksBuilding = true;
    }

    public PrimedTnt(Level p_32079_, double p_32080_, double p_32081_, double p_32082_, @Nullable LivingEntity p_32083_) {
        this(EntityType.TNT, p_32079_);
        this.setPos(p_32080_, p_32081_, p_32082_);
        double d0 = p_32079_.random.nextDouble() * (float) (Math.PI * 2);
        this.setDeltaMovement(-Math.sin(d0) * 0.02, 0.2F, -Math.cos(d0) * 0.02);
        this.setFuse(80);
        this.xo = p_32080_;
        this.yo = p_32081_;
        this.zo = p_32082_;
        this.owner = p_32083_;
    }

    @Override
    protected void defineSynchedData(SynchedEntityData.Builder p_331629_) {
        p_331629_.define(DATA_FUSE_ID, 80);
        p_331629_.define(DATA_BLOCK_STATE_ID, DEFAULT_BLOCK_STATE);
    }

    @Override
    protected Entity.MovementEmission getMovementEmission() {
        return Entity.MovementEmission.NONE;
    }

    @Override
    public boolean isPickable() {
        return !this.isRemoved();
    }

    @Override
    protected double getDefaultGravity() {
        return 0.04;
    }

    @Override
    public void tick() {
        this.handlePortal();
        this.applyGravity();
        this.move(MoverType.SELF, this.getDeltaMovement());
        this.applyEffectsFromBlocks();
        this.setDeltaMovement(this.getDeltaMovement().scale(0.98));
        if (this.onGround()) {
            this.setDeltaMovement(this.getDeltaMovement().multiply(0.7, -0.5, 0.7));
        }

        int i = this.getFuse() - 1;
        this.setFuse(i);
        if (i <= 0) {
            this.discard();
            if (!this.level().isClientSide) {
                this.explode();
            }
        } else {
            this.updateInWaterStateAndDoFluidPushing();
            if (this.level().isClientSide) {
                this.level().addParticle(ParticleTypes.SMOKE, this.getX(), this.getY() + 0.5, this.getZ(), 0.0, 0.0, 0.0);
            }
        }
    }

    private void explode() {
        if (this.level() instanceof ServerLevel serverlevel && serverlevel.getGameRules().getBoolean(GameRules.RULE_TNT_EXPLODES)) {
            this.level()
                .explode(
                    this,
                    Explosion.getDefaultDamageSource(this.level(), this),
                    this.usedPortal ? USED_PORTAL_DAMAGE_CALCULATOR : null,
                    this.getX(),
                    this.getY(0.0625),
                    this.getZ(),
                    this.explosionPower,
                    false,
                    Level.ExplosionInteraction.TNT
                );
        }
    }

    @Override
    protected void addAdditionalSaveData(CompoundTag p_32097_) {
        RegistryOps<Tag> registryops = this.registryAccess().createSerializationContext(NbtOps.INSTANCE);
        p_32097_.putShort("fuse", (short)this.getFuse());
        p_32097_.store("block_state", BlockState.CODEC, registryops, this.getBlockState());
        if (this.explosionPower != 4.0F) {
            p_32097_.putFloat("explosion_power", this.explosionPower);
        }
    }

    @Override
    protected void readAdditionalSaveData(CompoundTag p_32091_) {
        RegistryOps<Tag> registryops = this.registryAccess().createSerializationContext(NbtOps.INSTANCE);
        this.setFuse(p_32091_.getShortOr("fuse", (short)80));
        this.setBlockState(p_32091_.read("block_state", BlockState.CODEC, registryops).orElse(DEFAULT_BLOCK_STATE));
        this.explosionPower = Mth.clamp(p_32091_.getFloatOr("explosion_power", 4.0F), 0.0F, 128.0F);
    }

    @Nullable
    public LivingEntity getOwner() {
        return this.owner;
    }

    @Override
    public void restoreFrom(Entity p_310336_) {
        super.restoreFrom(p_310336_);
        if (p_310336_ instanceof PrimedTnt primedtnt) {
            this.owner = primedtnt.owner;
        }
    }

    public void setFuse(int p_32086_) {
        this.entityData.set(DATA_FUSE_ID, p_32086_);
    }

    public int getFuse() {
        return this.entityData.get(DATA_FUSE_ID);
    }

    public void setBlockState(BlockState p_311725_) {
        this.entityData.set(DATA_BLOCK_STATE_ID, p_311725_);
    }

    public BlockState getBlockState() {
        return this.entityData.get(DATA_BLOCK_STATE_ID);
    }

    private void setUsedPortal(boolean p_342933_) {
        this.usedPortal = p_342933_;
    }

    @Nullable
    @Override
    public Entity teleport(TeleportTransition p_366559_) {
        Entity entity = super.teleport(p_366559_);
        if (entity instanceof PrimedTnt primedtnt) {
            primedtnt.setUsedPortal(true);
        }

        return entity;
    }

    @Override
    public final boolean hurtServer(ServerLevel p_367466_, DamageSource p_362017_, float p_362976_) {
        return false;
    }
}