PaperMC/nms-patches/BlockPressurePlateWeighted.patch

--- ../work/decompile-8eb82bde//net/minecraft/server/BlockPressurePlateWeighted.java	2014-11-28 17:43:42.945707438 +0000
+++ src/main/java/net/minecraft/server/BlockPressurePlateWeighted.java	2014-11-28 17:38:19.000000000 +0000
@@ -1,5 +1,7 @@
 package net.minecraft.server;
 
+import org.bukkit.event.entity.EntityInteractEvent; // CraftBukkit
+
 public class BlockPressurePlateWeighted extends BlockPressurePlateAbstract {
 
     public static final BlockStateInteger POWER = BlockStateInteger.of("power", 0, 15);
@@ -12,7 +14,31 @@
     }
 
     protected int e(World world, BlockPosition blockposition) {
-        int i = Math.min(world.a(Entity.class, this.a(blockposition)).size(), this.b);
+        // CraftBukkit start
+        //int i = Math.min(world.a(Entity.class, this.a(blockposition)).size(), this.b);
+        int i = 0;
+        java.util.Iterator iterator = world.a(Entity.class, this.a(blockposition)).iterator();
+
+        while (iterator.hasNext()) {
+            Entity entity = (Entity) iterator.next();
+
+            org.bukkit.event.Cancellable cancellable;
+
+            if (entity instanceof EntityHuman) {
+                cancellable = org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent((EntityHuman) entity, org.bukkit.event.block.Action.PHYSICAL, blockposition, null, null);
+            } else {
+                cancellable = new EntityInteractEvent(entity.getBukkitEntity(), world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()));
+                world.getServer().getPluginManager().callEvent((EntityInteractEvent) cancellable);
+            }
+
+            // We only want to block turning the plate on if all events are cancelled
+            if (!cancellable.isCancelled()) {
+                i++;
+            }
+        }
+
+        i = Math.min(i, this.b);
+        // CraftBukkit end
 
         if (i > 0) {
             float f = (float) Math.min(this.b, i) / (float) this.b;