PaperMC/nms-patches/TileEntityChest.patch

--- a/net/minecraft/server/TileEntityChest.java
+++ b/net/minecraft/server/TileEntityChest.java
@@ -4,6 +4,11 @@
 import java.util.List;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.entity.CraftHumanEntity;
+import org.bukkit.entity.HumanEntity;
+// CraftBukkit end
+
 public class TileEntityChest extends TileEntityLootable implements ITickable, IInventory {
 
     private ItemStack[] items = new ItemStack[27];
@@ -21,6 +26,31 @@
 
     public TileEntityChest() {}
 
+    // CraftBukkit start - add fields and methods
+    public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
+    private int maxStack = MAX_STACK;
+
+    public ItemStack[] getContents() {
+        return this.items;
+    }
+
+    public void onOpen(CraftHumanEntity who) {
+        transaction.add(who);
+    }
+
+    public void onClose(CraftHumanEntity who) {
+        transaction.remove(who);
+    }
+
+    public List<HumanEntity> getViewers() {
+        return transaction;
+    }
+
+    public void setMaxStackSize(int size) {
+        maxStack = size;
+    }
+    // CraftBukkit end
+
     public TileEntityChest(BlockChest.Type blockchest_type) {
         this.q = blockchest_type;
     }
@@ -123,10 +153,11 @@
     }
 
     public int getMaxStackSize() {
-        return 64;
+        return maxStack; // CraftBukkit
     }
 
     public boolean a(EntityHuman entityhuman) {
+        if (this.world == null) return true; // CraftBukkit
         return this.world.getTileEntity(this.position) != this ? false : entityhuman.e((double) this.position.getX() + 0.5D, (double) this.position.getY() + 0.5D, (double) this.position.getZ() + 0.5D) <= 64.0D;
     }
 
@@ -303,9 +334,21 @@
             if (this.l < 0) {
                 this.l = 0;
             }
+            int oldPower = Math.max(0, Math.min(15, this.l)); // CraftBukkit - Get power before new viewer is added
 
             ++this.l;
+            if (this.world == null) return; // CraftBukkit
             this.world.playBlockAction(this.position, this.getBlock(), 1, this.l);
+
+            // CraftBukkit start - Call redstone event
+            if (this.getBlock() == Blocks.TRAPPED_CHEST) {
+                int newPower = Math.max(0, Math.min(15, this.l));
+
+                if (oldPower != newPower) {
+                    org.bukkit.craftbukkit.event.CraftEventFactory.callRedstoneChange(world, position.getX(), position.getY(), position.getZ(), oldPower, newPower);
+                }
+            }
+            // CraftBukkit end
             this.world.applyPhysics(this.position, this.getBlock());
             this.world.applyPhysics(this.position.down(), this.getBlock());
         }
@@ -314,8 +357,20 @@
 
     public void closeContainer(EntityHuman entityhuman) {
         if (!entityhuman.isSpectator() && this.getBlock() instanceof BlockChest) {
+            int oldPower = Math.max(0, Math.min(15, this.l)); // CraftBukkit - Get power before new viewer is added
             --this.l;
+            if (this.world == null) return; // CraftBukkit
             this.world.playBlockAction(this.position, this.getBlock(), 1, this.l);
+
+            // CraftBukkit start - Call redstone event
+            if (this.getBlock() == Blocks.TRAPPED_CHEST) {
+                int newPower = Math.max(0, Math.min(15, this.l));
+
+                if (oldPower != newPower) {
+                    org.bukkit.craftbukkit.event.CraftEventFactory.callRedstoneChange(world, position.getX(), position.getY(), position.getZ(), oldPower, newPower);
+                }
+            }
+            // CraftBukkit end
             this.world.applyPhysics(this.position, this.getBlock());
             this.world.applyPhysics(this.position.down(), this.getBlock());
         }
@@ -372,6 +427,13 @@
 
     }
 
+    // CraftBukkit start
+    @Override
+    public boolean isFilteredNBT() {
+        return true;
+    }
+    // CraftBukkit end
+
     static class SyntheticClass_1 {
 
         static final int[] a = new int[EnumDirection.values().length];