From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Zach Brown <zach@zachbr.io> Date: Thu, 31 Jan 2019 16:33:36 -0500 Subject: [PATCH] Fire BlockPistonRetractEvent for all empty pistons There is an explicit check in the handling code for empty pistons that prevents sticky pistons from firing the event. However when we look back at the history we see that this check was originally added so that ONLY sticky pistons would fire the retract event. I'm not sure why. https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/1092acbddf07edfa4100bc6824504ac75088e913 Over the course of several updates, the meaning of that field appears to have changed from "is NOT sticky" to "is sticky". So now its having the opposite effect. Only normal pistons fire the retraction event. And like all things in CB, it's just been carried around since. If we are to believe the history, the correct fix for this issue is to flip it so it only fires for sticky pistons, but that puts us in a bind. It's already firing for non-sticky pistons, changing it now would likely result in breakage. Furthermore, there is little documentation as to WHY that was ever intended to be the case. Instead we opt to remove the check entirely so that the event fires for all piston types. diff --git a/src/main/java/net/minecraft/world/level/block/piston/BlockPiston.java b/src/main/java/net/minecraft/world/level/block/piston/BlockPiston.java index 869aaae93bc83b8271644147bb569c868ab13fb8..7de86d6232eb84642fb6423a1b0a9f30d9df9f2b 100644 --- a/src/main/java/net/minecraft/world/level/block/piston/BlockPiston.java +++ b/src/main/java/net/minecraft/world/level/block/piston/BlockPiston.java @@ -141,7 +141,7 @@ public class BlockPiston extends BlockDirectional { } // CraftBukkit start - if (!this.sticky) { + //if (!this.sticky) { // Paper - Prevents empty sticky pistons from firing retract - history behind is odd org.bukkit.block.Block block = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()); BlockPistonRetractEvent event = new BlockPistonRetractEvent(block, ImmutableList.<org.bukkit.block.Block>of(), CraftBlock.notchToBlockFace(enumdirection)); world.getServer().getPluginManager().callEvent(event); @@ -149,7 +149,7 @@ public class BlockPiston extends BlockDirectional { if (event.isCancelled()) { return; } - } + //} // Paper // PAIL: checkME - what happened to setTypeAndData? // CraftBukkit end world.playBlockAction(blockposition, this, b0, enumdirection.c());