Paper/patches/api/0407-Add-EntityFertilizeEggEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com>
Date: Fri, 24 Jun 2022 11:56:32 +0200
Subject: [PATCH] Add EntityFertilizeEggEvent


diff --git a/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java b/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..adc596cae5e4a6e52c51eba16b5aa37410d30e5c
--- /dev/null
+++ b/src/main/java/io/papermc/paper/event/entity/EntityFertilizeEggEvent.java
@@ -0,0 +1,140 @@
+package io.papermc.paper.event.entity;
+
+import com.google.common.base.Preconditions;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Called when two entities mate and the mating process results in a fertilization.
+ * Fertilization differs from normal breeding, as represented by the {@link org.bukkit.event.entity.EntityBreedEvent}, as
+ * it does not result in the immediate creation of the child entity in the world.
+ * <p>
+ * An example of this would be:
+ * <ul>
+ * <li>A frog being marked as "is_pregnant" and laying {@link org.bukkit.Material#FROGSPAWN} later.</li>
+ * <li>Sniffers producing the {@link org.bukkit.Material#SNIFFER_EGG} item, which needs to be placed before it can begin to hatch.</li>
+ * <li>A turtle being marked with "HasEgg" and laying a {@link org.bukkit.Material#TURTLE_EGG} later.</li>
+ * </ul>
+ *
+ * The event hence only exposes the two parent entities in the fertilization process and cannot provide the child entity, as it will only exist at a later point in time.
+ */
+public class EntityFertilizeEggEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final LivingEntity mother;
+    private final LivingEntity father;
+    private final Player breeder;
+    private final ItemStack bredWith;
+    private int experience;
+
+    private boolean cancel;
+
+    public EntityFertilizeEggEvent(@NotNull LivingEntity mother, @NotNull LivingEntity father, @Nullable Player breeder, @Nullable ItemStack bredWith, int experience) {
+        super(mother);
+        Preconditions.checkArgument(mother != null, "Cannot have null mother");
+        Preconditions.checkArgument(father != null, "Cannot have null father");
+
+        // Breeder can be null in the case of spontaneous conception
+        this.mother = mother;
+        this.father = father;
+        this.breeder = breeder;
+        this.bredWith = bredWith;
+        this.experience = experience;
+    }
+
+    @NotNull
+    @Override
+    public LivingEntity getEntity() {
+        return (LivingEntity) entity;
+    }
+
+    /**
+     * Provides the entity in the fertilization process that will eventually be responsible for "creating" offspring,
+     * may that be by setting a block that later hatches or dropping an egg that has to be placed.
+     *
+     * @return The "mother" entity.
+     */
+    @NotNull
+    public LivingEntity getMother() {
+        return mother;
+    }
+
+    /**
+     * Provides the "father" entity in the fertilization process that is not responsible for initiating the offspring
+     * creation.
+     *
+     * @return the other parent
+     */
+    @NotNull
+    public LivingEntity getFather() {
+        return father;
+    }
+
+    /**
+     * Gets the Entity responsible for fertilization. Breeder is null for spontaneous
+     * conception.
+     *
+     * @return The Entity who initiated breeding.
+     */
+    @Nullable
+    public Player getBreeder() {
+        return breeder;
+    }
+
+    /**
+     * The ItemStack that was used to initiate fertilization, if present.
+     *
+     * @return ItemStack used to initiate breeding.
+     */
+    @Nullable
+    public ItemStack getBredWith() {
+        return bredWith;
+    }
+
+    /**
+     * Get the amount of experience granted by fertilization.
+     *
+     * @return experience amount
+     */
+    public int getExperience() {
+        return experience;
+    }
+
+    /**
+     * Set the amount of experience granted by fertilization.
+     * If the amount is negative or zero, no experience will be dropped.
+     *
+     * @param experience experience amount
+     */
+    public void setExperience(int experience) {
+        this.experience = experience;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancel;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancel = cancel;
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}