minecraft-src/net/minecraft/world/food/FoodData.java

package net.minecraft.world.food;

import net.minecraft.nbt.CompoundTag;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.util.Mth;
import net.minecraft.world.Difficulty;
import net.minecraft.world.level.GameRules;

public class FoodData {
	private static final int DEFAULT_TICK_TIMER = 0;
	private static final float DEFAULT_EXHAUSTION_LEVEL = 0.0F;
	private int foodLevel = 20;
	private float saturationLevel = 5.0F;
	private float exhaustionLevel;
	private int tickTimer;

	private void add(int foodLevel, float saturationLevel) {
		this.foodLevel = Mth.clamp(foodLevel + this.foodLevel, 0, 20);
		this.saturationLevel = Mth.clamp(saturationLevel + this.saturationLevel, 0.0F, (float)this.foodLevel);
	}

	/**
	 * Add food stats.
	 */
	public void eat(int foodLevelModifier, float saturationLevelModifier) {
		this.add(foodLevelModifier, FoodConstants.saturationByModifier(foodLevelModifier, saturationLevelModifier));
	}

	public void eat(FoodProperties foodProperties) {
		this.add(foodProperties.nutrition(), foodProperties.saturation());
	}

	public void tick(ServerPlayer player) {
		ServerLevel serverLevel = player.serverLevel();
		Difficulty difficulty = serverLevel.getDifficulty();
		if (this.exhaustionLevel > 4.0F) {
			this.exhaustionLevel -= 4.0F;
			if (this.saturationLevel > 0.0F) {
				this.saturationLevel = Math.max(this.saturationLevel - 1.0F, 0.0F);
			} else if (difficulty != Difficulty.PEACEFUL) {
				this.foodLevel = Math.max(this.foodLevel - 1, 0);
			}
		}

		boolean bl = serverLevel.getGameRules().getBoolean(GameRules.RULE_NATURAL_REGENERATION);
		if (bl && this.saturationLevel > 0.0F && player.isHurt() && this.foodLevel >= 20) {
			this.tickTimer++;
			if (this.tickTimer >= 10) {
				float f = Math.min(this.saturationLevel, 6.0F);
				player.heal(f / 6.0F);
				this.addExhaustion(f);
				this.tickTimer = 0;
			}
		} else if (bl && this.foodLevel >= 18 && player.isHurt()) {
			this.tickTimer++;
			if (this.tickTimer >= 80) {
				player.heal(1.0F);
				this.addExhaustion(6.0F);
				this.tickTimer = 0;
			}
		} else if (this.foodLevel <= 0) {
			this.tickTimer++;
			if (this.tickTimer >= 80) {
				if (player.getHealth() > 10.0F || difficulty == Difficulty.HARD || player.getHealth() > 1.0F && difficulty == Difficulty.NORMAL) {
					player.hurtServer(serverLevel, player.damageSources().starve(), 1.0F);
				}

				this.tickTimer = 0;
			}
		} else {
			this.tickTimer = 0;
		}
	}

	/**
	 * Reads the food data for the player.
	 */
	public void readAdditionalSaveData(CompoundTag compoundTag) {
		this.foodLevel = compoundTag.getIntOr("foodLevel", 20);
		this.tickTimer = compoundTag.getIntOr("foodTickTimer", 0);
		this.saturationLevel = compoundTag.getFloatOr("foodSaturationLevel", 5.0F);
		this.exhaustionLevel = compoundTag.getFloatOr("foodExhaustionLevel", 0.0F);
	}

	/**
	 * Writes the food data for the player.
	 */
	public void addAdditionalSaveData(CompoundTag compoundTag) {
		compoundTag.putInt("foodLevel", this.foodLevel);
		compoundTag.putInt("foodTickTimer", this.tickTimer);
		compoundTag.putFloat("foodSaturationLevel", this.saturationLevel);
		compoundTag.putFloat("foodExhaustionLevel", this.exhaustionLevel);
	}

	/**
	 * Get the player's food level.
	 */
	public int getFoodLevel() {
		return this.foodLevel;
	}

	/**
	 * Get whether the player must eat food.
	 */
	public boolean needsFood() {
		return this.foodLevel < 20;
	}

	/**
	 * Adds input to {@code foodExhaustionLevel} to a max of 40.
	 */
	public void addExhaustion(float exhaustion) {
		this.exhaustionLevel = Math.min(this.exhaustionLevel + exhaustion, 40.0F);
	}

	/**
	 * Get the player's food saturation level.
	 */
	public float getSaturationLevel() {
		return this.saturationLevel;
	}

	public void setFoodLevel(int foodLevel) {
		this.foodLevel = foodLevel;
	}

	public void setSaturation(float saturationLevel) {
		this.saturationLevel = saturationLevel;
	}
}