src/game/java/net/minecraft/world/damagesource/DamageSource.java

package net.minecraft.world.damagesource;

import javax.annotation.Nullable;
import net.minecraft.core.Holder;
import net.minecraft.core.component.DataComponents;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceKey;
import net.minecraft.tags.TagKey;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.LivingEntity;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.phys.Vec3;

public class DamageSource {
    private final Holder<DamageType> type;
    @Nullable
    private final Entity causingEntity;
    @Nullable
    private final Entity directEntity;
    @Nullable
    private final Vec3 damageSourcePosition;

    @Override
    public String toString() {
        return "DamageSource (" + this.type().msgId() + ")";
    }

    public float getFoodExhaustion() {
        return this.type().exhaustion();
    }

    public boolean isDirect() {
        return this.causingEntity == this.directEntity;
    }

    private DamageSource(Holder<DamageType> p_270906_, @Nullable Entity p_270796_, @Nullable Entity p_270459_, @Nullable Vec3 p_270623_) {
        this.type = p_270906_;
        this.causingEntity = p_270459_;
        this.directEntity = p_270796_;
        this.damageSourcePosition = p_270623_;
    }

    public DamageSource(Holder<DamageType> p_270818_, @Nullable Entity p_270162_, @Nullable Entity p_270115_) {
        this(p_270818_, p_270162_, p_270115_, null);
    }

    public DamageSource(Holder<DamageType> p_270690_, Vec3 p_270579_) {
        this(p_270690_, null, null, p_270579_);
    }

    public DamageSource(Holder<DamageType> p_270811_, @Nullable Entity p_270660_) {
        this(p_270811_, p_270660_, p_270660_);
    }

    public DamageSource(Holder<DamageType> p_270475_) {
        this(p_270475_, null, null, null);
    }

    @Nullable
    public Entity getDirectEntity() {
        return this.directEntity;
    }

    @Nullable
    public Entity getEntity() {
        return this.causingEntity;
    }

    @Nullable
    public ItemStack getWeaponItem() {
        return this.directEntity != null ? this.directEntity.getWeaponItem() : null;
    }

    public Component getLocalizedDeathMessage(LivingEntity p_19343_) {
        String s = "death.attack." + this.type().msgId();
        if (this.causingEntity == null && this.directEntity == null) {
            LivingEntity livingentity1 = p_19343_.getKillCredit();
            String s1 = s + ".player";
            return livingentity1 != null ? Component.translatable(s1, p_19343_.getDisplayName(), livingentity1.getDisplayName()) : Component.translatable(s, p_19343_.getDisplayName());
        } else {
            Component component = this.causingEntity == null ? this.directEntity.getDisplayName() : this.causingEntity.getDisplayName();
            ItemStack itemstack = this.causingEntity instanceof LivingEntity livingentity ? livingentity.getMainHandItem() : ItemStack.EMPTY;
            return !itemstack.isEmpty() && itemstack.has(DataComponents.CUSTOM_NAME)
                ? Component.translatable(s + ".item", p_19343_.getDisplayName(), component, itemstack.getDisplayName())
                : Component.translatable(s, p_19343_.getDisplayName(), component);
        }
    }

    public String getMsgId() {
        return this.type().msgId();
    }

    public boolean scalesWithDifficulty() {
        return switch (this.type().scaling()) {
            case NEVER -> false;
            case WHEN_CAUSED_BY_LIVING_NON_PLAYER -> this.causingEntity instanceof LivingEntity && !(this.causingEntity instanceof Player);
            case ALWAYS -> true;
        };
    }

    public boolean isCreativePlayer() {
        if (this.getEntity() instanceof Player player && player.getAbilities().instabuild) {
            return true;
        }

        return false;
    }

    @Nullable
    public Vec3 getSourcePosition() {
        if (this.damageSourcePosition != null) {
            return this.damageSourcePosition;
        } else {
            return this.directEntity != null ? this.directEntity.position() : null;
        }
    }

    @Nullable
    public Vec3 sourcePositionRaw() {
        return this.damageSourcePosition;
    }

    public boolean is(TagKey<DamageType> p_270890_) {
        return this.type.is(p_270890_);
    }

    public boolean is(ResourceKey<DamageType> p_276108_) {
        return this.type.is(p_276108_);
    }

    public DamageType type() {
        return this.type.value();
    }

    public Holder<DamageType> typeHolder() {
        return this.type;
    }
}