PaperMC/nms-patches/EntityHanging.patch

--- ../work/decompile-8eb82bde//net/minecraft/server/EntityHanging.java	2014-11-28 17:43:43.097707435 +0000
+++ src/main/java/net/minecraft/server/EntityHanging.java	2014-11-28 17:38:18.000000000 +0000
@@ -4,6 +4,13 @@
 import java.util.List;
 import org.apache.commons.lang3.Validate;
 
+// CraftBukkit start
+import org.bukkit.entity.Hanging;
+import org.bukkit.entity.Painting;
+import org.bukkit.event.hanging.HangingBreakEvent;
+import org.bukkit.event.painting.PaintingBreakEvent;
+// CraftBukkit end
+
 public abstract class EntityHanging extends Entity {
 
     private int c;
@@ -77,6 +84,33 @@
         if (this.c++ == 100 && !this.world.isStatic) {
             this.c = 0;
             if (!this.dead && !this.survives()) {
+                // CraftBukkit start - fire break events
+                Material material = this.world.getType(new BlockPosition(this)).getBlock().getMaterial();
+                HangingBreakEvent.RemoveCause cause;
+
+                if (!material.equals(Material.AIR)) {
+                    // TODO: This feels insufficient to catch 100% of suffocation cases
+                    cause = HangingBreakEvent.RemoveCause.OBSTRUCTION;
+                } else {
+                    cause = HangingBreakEvent.RemoveCause.PHYSICS;
+                }
+
+                HangingBreakEvent event = new HangingBreakEvent((Hanging) this.getBukkitEntity(), cause);
+                this.world.getServer().getPluginManager().callEvent(event);
+
+                PaintingBreakEvent paintingEvent = null;
+                if (this instanceof EntityPainting) {
+                    // Fire old painting event until it can be removed
+                    paintingEvent = new PaintingBreakEvent((Painting) this.getBukkitEntity(), PaintingBreakEvent.RemoveCause.valueOf(cause.name()));
+                    paintingEvent.setCancelled(event.isCancelled());
+                    this.world.getServer().getPluginManager().callEvent(paintingEvent);
+                }
+
+                if (dead || event.isCancelled() || (paintingEvent != null && paintingEvent.isCancelled())) {
+                    return;
+                }
+                // CraftBukkit end
+        
                 this.die();
                 this.b((Entity) null);
             }
@@ -138,6 +172,32 @@
             return false;
         } else {
             if (!this.dead && !this.world.isStatic) {
+                // CraftBukkit start - fire break events
+                HangingBreakEvent event = new HangingBreakEvent((Hanging) this.getBukkitEntity(), HangingBreakEvent.RemoveCause.DEFAULT);
+                PaintingBreakEvent paintingEvent = null;
+                if (damagesource.getEntity() != null) {
+                    event = new org.bukkit.event.hanging.HangingBreakByEntityEvent((Hanging) this.getBukkitEntity(), damagesource.getEntity() == null ? null : damagesource.getEntity().getBukkitEntity());
+
+                    if (this instanceof EntityPainting) {
+                        // Fire old painting event until it can be removed
+                        paintingEvent = new org.bukkit.event.painting.PaintingBreakByEntityEvent((Painting) this.getBukkitEntity(), damagesource.getEntity() == null ? null : damagesource.getEntity().getBukkitEntity());
+                    }
+                } else if (damagesource.isExplosion()) {
+                    event = new HangingBreakEvent((Hanging) this.getBukkitEntity(), HangingBreakEvent.RemoveCause.EXPLOSION);
+                }
+
+                this.world.getServer().getPluginManager().callEvent(event);
+
+                if (paintingEvent != null) {
+                    paintingEvent.setCancelled(event.isCancelled());
+                    this.world.getServer().getPluginManager().callEvent(paintingEvent);
+                }
+
+                if (this.dead || event.isCancelled() || (paintingEvent != null && paintingEvent.isCancelled())) {
+                    return true;
+                }
+                // CraftBukkit end
+
                 this.die();
                 this.ac();
                 this.b(damagesource.getEntity());
@@ -149,6 +209,18 @@
 
     public void move(double d0, double d1, double d2) {
         if (!this.world.isStatic && !this.dead && d0 * d0 + d1 * d1 + d2 * d2 > 0.0D) {
+            if (this.dead) return; // CraftBukkit
+
+            // CraftBukkit start - fire break events
+            // TODO - Does this need its own cause? Seems to only be triggered by pistons
+            HangingBreakEvent event = new HangingBreakEvent((Hanging) this.getBukkitEntity(), HangingBreakEvent.RemoveCause.PHYSICS);
+            this.world.getServer().getPluginManager().callEvent(event);
+
+            if (this.dead || event.isCancelled()) {
+                return;
+            }
+            // CraftBukkit end
+            
             this.die();
             this.b((Entity) null);
         }
@@ -156,7 +228,7 @@
     }
 
     public void g(double d0, double d1, double d2) {
-        if (!this.world.isStatic && !this.dead && d0 * d0 + d1 * d1 + d2 * d2 > 0.0D) {
+        if (false && !this.world.isStatic && !this.dead && d0 * d0 + d1 * d1 + d2 * d2 > 0.0D) { // CraftBukkit - not needed
             this.die();
             this.b((Entity) null);
         }