From b7bcbfba58901386aae82eb079dafc7d2bb6f17f Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sat, 23 Mar 2013 09:46:33 +1100
Subject: [PATCH] Merge tweaks and configuration

This allows the merging of Experience orbs, as well as the configuration of the merge radius of items. Additionally it refactors the merge algorithm to be a better experience for players.

diff --git a/src/main/java/net/minecraft/server/EntityItem.java b/src/main/java/net/minecraft/server/EntityItem.java
index 0225f53..048e8fa 100644
--- a/src/main/java/net/minecraft/server/EntityItem.java
+++ b/src/main/java/net/minecraft/server/EntityItem.java
@@ -114,7 +114,10 @@ public class EntityItem extends Entity {
     }
 
     private void g() {
-        Iterator iterator = this.world.a(EntityItem.class, this.boundingBox.grow(0.5D, 0.0D, 0.5D)).iterator();
+        // Spigot start
+        double radius = world.spigotConfig.itemMerge;
+        Iterator iterator = this.world.a(EntityItem.class, this.boundingBox.grow(radius, radius, radius)).iterator();
+        // Spigot end
 
         while (iterator.hasNext()) {
             EntityItem entityitem = (EntityItem) iterator.next();
@@ -143,11 +146,13 @@ public class EntityItem extends Entity {
             } else if (itemstack1.count + itemstack.count > itemstack1.getMaxStackSize()) {
                 return false;
             } else {
-                itemstack1.count += itemstack.count;
-                entityitem.pickupDelay = Math.max(entityitem.pickupDelay, this.pickupDelay);
-                entityitem.age = Math.min(entityitem.age, this.age);
-                entityitem.setItemStack(itemstack1);
-                this.die();
+                // Spigot start
+                itemstack.count += itemstack1.count;
+                this.pickupDelay = Math.max(entityitem.pickupDelay, this.pickupDelay);
+                this.age = Math.min(entityitem.age, this.age);
+                this.setItemStack(itemstack);
+                entityitem.die();
+                // Spigot end
                 return true;
             }
         } else {
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index afe3e4d..97da2cd 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -957,6 +957,23 @@ public abstract class World implements IBlockAccess {
             // Not all projectiles extend EntityProjectile, so check for Bukkit interface instead
             event = CraftEventFactory.callProjectileLaunchEvent(entity);
         }
+        // Spigot start
+        else if (entity instanceof EntityExperienceOrb) {
+            EntityExperienceOrb xp = (EntityExperienceOrb) entity;
+            double radius = spigotConfig.expMerge;
+            if (radius > 0) {
+                List<Entity> entities = this.getEntities(entity, entity.boundingBox.grow(radius, radius, radius));
+                for (Entity e : entities) {
+                    if (e instanceof EntityExperienceOrb) {
+                        EntityExperienceOrb loopItem = (EntityExperienceOrb) e;
+                        if (!loopItem.dead) {
+                            xp.value += loopItem.value;
+                            loopItem.die();
+                        }
+                    }
+                }
+            }
+        } // Spigot end
 
         if (event != null && (event.isCancelled() || entity.dead)) {
             entity.dead = true;
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index fcc2c88..58406e5 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -99,4 +99,18 @@ public class SpigotWorldConfig
         wheatModifier = getInt( "growth.wheat-modifier", 100 );
         log( "Cactus Growth Modifier: " + cactusModifier + "%" );
     }
+
+    public double itemMerge;
+    private void itemMerge()
+    {
+        itemMerge = getDouble("merge-radius.item", 2.5 );
+        log( "Item Merge Radius: " + itemMerge );
+    }
+
+    public double expMerge;
+    private void expMerge()
+    {
+        expMerge = getDouble("merge-radius.exp", 3.0 );
+        log( "Experience Merge Radius: " + expMerge );
+    }
 }
-- 
1.8.1.2