From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: kickash32 <kickash32@gmail.com>
Date: Mon, 3 Jun 2019 02:02:39 -0400
Subject: [PATCH] Implement alternative item-despawn-rate

Co-authored-by: Noah van der Aa <ndvdaa@gmail.com>

diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
index 477c9358a09067ace4d0fe3f519148feb4c7a335..1dc7f3963069313de6b969c44bdd21272483f7be 100644
--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
@@ -52,6 +52,7 @@ public class ItemEntity extends Entity {
     public final float bobOffs;
     private int lastTick = MinecraftServer.currentTick - 1; // CraftBukkit
     public boolean canMobPickup = true; // Paper
+    private int despawnRate = -1; // Paper
 
     public ItemEntity(EntityType<? extends ItemEntity> type, Level world) {
         super(type, world);
@@ -180,7 +181,7 @@ public class ItemEntity extends Entity {
                 }
             }
 
-            if (!this.level.isClientSide && this.age >= level.spigotConfig.itemDespawnRate) { // Spigot
+            if (!this.level.isClientSide && this.age >= this.despawnRate) { // Spigot // Paper
                 // CraftBukkit start - fire ItemDespawnEvent
                 if (org.bukkit.craftbukkit.event.CraftEventFactory.callItemDespawnEvent(this).isCancelled()) {
                     this.age = 0;
@@ -204,7 +205,7 @@ public class ItemEntity extends Entity {
         this.lastTick = MinecraftServer.currentTick;
         // CraftBukkit end
 
-        if (!this.level.isClientSide && this.age >= level.spigotConfig.itemDespawnRate) { // Spigot
+        if (!this.level.isClientSide && this.age >= this.despawnRate) { // Spigot // Paper
             // CraftBukkit start - fire ItemDespawnEvent
             if (org.bukkit.craftbukkit.event.CraftEventFactory.callItemDespawnEvent(this).isCancelled()) {
                 this.age = 0;
@@ -255,7 +256,7 @@ public class ItemEntity extends Entity {
     private boolean isMergable() {
         ItemStack itemstack = this.getItem();
 
-        return this.isAlive() && this.pickupDelay != 32767 && this.age != -32768 && this.age < 6000 && itemstack.getCount() < itemstack.getMaxStackSize();
+        return this.isAlive() && this.pickupDelay != 32767 && this.age != -32768 && this.age < this.despawnRate && itemstack.getCount() < itemstack.getMaxStackSize(); // Paper - respect despawn rate in pickup check.
     }
 
     private void tryToMerge(ItemEntity other) {
@@ -499,6 +500,7 @@ public class ItemEntity extends Entity {
         com.google.common.base.Preconditions.checkArgument(!stack.isEmpty(), "Cannot drop air"); // CraftBukkit
         this.getEntityData().set(ItemEntity.DATA_ITEM, stack);
         this.getEntityData().markDirty(ItemEntity.DATA_ITEM); // CraftBukkit - SPIGOT-4591, must mark dirty
+        this.despawnRate = level.paperConfig().entities.spawning.altItemDespawnRate.enabled ? level.paperConfig().entities.spawning.altItemDespawnRate.items.getOrDefault(stack.getItem(), level.spigotConfig.itemDespawnRate) : level.spigotConfig.itemDespawnRate; // Paper
     }
 
     @Override
@@ -562,7 +564,7 @@ public class ItemEntity extends Entity {
 
     public void makeFakeItem() {
         this.setNeverPickUp();
-        this.age = level.spigotConfig.itemDespawnRate - 1; // Spigot
+        this.age = this.despawnRate - 1; // Spigot
     }
 
     public float getSpin(float tickDelta) {