Fixed Flower Basket

src/main/java/biomesoplenty/common/handler/ItemEventHandler.java

@@ -28,7 +28,7 @@ public class ItemEventHandler
             if (ItemFlowerBasket.isBasketOpen(stack))
             {
                 //Remove the itemstack from the inventory now to prevent a loop
-                player.inventory.setItemStack(null);
+                player.inventory.setItemStack(ItemStack.EMPTY);
                 player.closeScreen();
             }
         }
@@ -50,12 +50,12 @@ public class ItemEventHandler
         {
             //Check if the player has a basket in their inventory, and if the stack is suitable for adding
             //to the basket
-            if (basketStack != null && ItemFlowerBasket.isStackSuitableForBasket(stack))
+            if (!basketStack.isEmpty() && ItemFlowerBasket.isStackSuitableForBasket(stack))
             {
                 InventoryFlowerBasket inventory = new InventoryFlowerBasket(basketStack, player);
 
                 //Add the stack to the basket's inventory, if successful, don't add it to the player's regular inventory
-                if (inventory.addItem(stack) == null)
+                if (inventory.addItem(stack).isEmpty())
                 {
                     //Set stack size to 0 to cause it to be removed
                     stack.setCount(0);

src/main/java/biomesoplenty/common/inventory/ContainerFlowerBasket.java

@@ -18,6 +18,8 @@ import net.minecraft.inventory.IInventory;
 import net.minecraft.inventory.Slot;
 import net.minecraft.item.ItemStack;
 
+import javax.annotation.Nonnull;
+
 public class ContainerFlowerBasket extends Container
 {
     private static final int PLAYER_ROWS = 3;
@@ -76,9 +78,10 @@ public class ContainerFlowerBasket extends Container
     }
 
     @Override
+    @Nonnull
     public ItemStack transferStackInSlot(EntityPlayer player, int index)
     {
-        ItemStack oldStack = null;
+        ItemStack oldStack = ItemStack.EMPTY;
         Slot slot = (Slot)this.inventorySlots.get(index);
 
         //Ensure there is a slot at this index and it has an item in it
@@ -91,17 +94,17 @@ public class ContainerFlowerBasket extends Container
             {
                 if (!this.mergeItemStack(mergedStack, INVENTORY_ROWS * 9, this.inventorySlots.size(), true))
                 {
-                    return null;
+                    return ItemStack.EMPTY;
                 }
             }
             else if (!this.mergeItemStack(mergedStack, 0, INVENTORY_ROWS * 9, false))
             {
-                return null;
+                return ItemStack.EMPTY;
             }
 
             if (mergedStack.getCount() == 0)
             {
-                slot.putStack((ItemStack)null);
+                slot.putStack(ItemStack.EMPTY);
             }
             else
             {
@@ -120,7 +123,7 @@ public class ContainerFlowerBasket extends Container
         }
         
         @Override
-        public boolean isItemValid(ItemStack stack)
+        public boolean isItemValid(@Nonnull ItemStack stack)
         {
             return ItemFlowerBasket.isStackSuitableForBasket(stack);
         }

src/main/java/biomesoplenty/common/inventory/InventoryFlowerBasket.java

@@ -19,6 +19,8 @@ import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
 import net.minecraftforge.common.util.Constants;
 
+import javax.annotation.Nonnull;
+
 public class InventoryFlowerBasket extends InventoryBasic
 {
     public static final int INVENTORY_ROWS = 2;
@@ -26,9 +28,9 @@ public class InventoryFlowerBasket extends InventoryBasic
     
     private EntityPlayer player;
     
-    private ItemStack ownerStack;
+    private ItemStack ownerStack = ItemStack.EMPTY;
     
-    public InventoryFlowerBasket(ItemStack ownerStack, EntityPlayer player) 
+    public InventoryFlowerBasket(@Nonnull ItemStack ownerStack, EntityPlayer player)
     {
         super("container.flower_basket", false, INVENTORY_ROWS * INVENTORY_COLUMNS);
         
@@ -37,7 +39,7 @@ public class InventoryFlowerBasket extends InventoryBasic
         //Load only on the server
         ItemStack basketStack = ownerStack;
 
-        if (basketStack == null) basketStack = player.getHeldItem(PlayerUtil.getHandForItemAndMeta(player, BOPItems.flower_basket, 0));
+        if (basketStack.isEmpty()) basketStack = player.getHeldItem(PlayerUtil.getHandForItemAndMeta(player, BOPItems.flower_basket, 0));
         else this.ownerStack = basketStack;
 
         NBTTagCompound invData = NBTUtil.getOrCreateStackNBT(basketStack);
@@ -46,7 +48,7 @@ public class InventoryFlowerBasket extends InventoryBasic
     
     public InventoryFlowerBasket(EntityPlayer player)
     {
-        this(null, player);
+        this(ItemStack.EMPTY, player);
     }
     
     @Override
@@ -56,7 +58,7 @@ public class InventoryFlowerBasket extends InventoryBasic
         ItemStack basketStack = getBasketStack();
 
         //There's no point continuing if there's nothing to save to
-        if (basketStack != null)
+        if (!basketStack.isEmpty())
         {
             NBTTagCompound currentData = new NBTTagCompound();
             //Overwrite relevant data in the compound with updated data
@@ -99,7 +101,7 @@ public class InventoryFlowerBasket extends InventoryBasic
         //Iterate over all valid slot indexes
         for (int slotIndex = 0; slotIndex < this.getSizeInventory(); ++slotIndex)
         {
-            if (this.getStackInSlot(slotIndex) != null)
+            if (!this.getStackInSlot(slotIndex).isEmpty())
             {
                 //Create a new item tag and populate it with data
                 NBTTagCompound itemTag = new NBTTagCompound();
@@ -122,8 +124,9 @@ public class InventoryFlowerBasket extends InventoryBasic
         compound.setBoolean("BasketOpen", ItemFlowerBasket.isBasketOpen(getBasketStack()));
     }
 
+    @Nonnull
     private ItemStack getBasketStack()
     {
-        return this.ownerStack != null ? this.ownerStack : ItemFlowerBasket.findOpenBasketStack(this.player);
+        return !this.ownerStack.isEmpty() ? this.ownerStack : ItemFlowerBasket.findOpenBasketStack(this.player);
     }
 }

src/main/java/biomesoplenty/common/item/ItemFlowerBasket.java

@@ -30,6 +30,8 @@ import net.minecraftforge.common.IShearable;
 import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
+import javax.annotation.Nonnull;
+
 public class ItemFlowerBasket extends Item
 {
     public ItemFlowerBasket()
@@ -38,14 +40,14 @@ public class ItemFlowerBasket extends Item
         {
             @Override
             @SideOnly(Side.CLIENT)
-            public float apply(ItemStack stack, World world, EntityLivingBase entity) 
+            public float apply(@Nonnull ItemStack stack, World world, EntityLivingBase entity)
             {
                 InventoryFlowerBasket inventory = new InventoryFlowerBasket(stack, null);
                 boolean filled = false;
                 
                 for (int index = 0; index < inventory.getSizeInventory(); ++index)
                 {
-                    if (inventory.getStackInSlot(index) != null)
+                    if (!inventory.getStackInSlot(index).isEmpty())
                     {
                         filled = true;
                         break;
@@ -79,20 +81,22 @@ public class ItemFlowerBasket extends Item
         return new ActionResult<ItemStack>(EnumActionResult.SUCCESS, stack);
     }
 
+    @Nonnull
     public static ItemStack findBasketStack(EntityPlayer player)
     {
         //Search every item in the player's main inventory for a basket
         for (ItemStack stack : player.inventory.mainInventory)
         {
-            if (stack != null && stack.getItem() instanceof ItemFlowerBasket)
+            if (!stack.isEmpty() && stack.getItem() instanceof ItemFlowerBasket)
             {
                 return stack;
             }
         }
         
-        return null;
+        return ItemStack.EMPTY;
     }
 
+    @Nonnull
     public static ItemStack findOpenBasketStack(EntityPlayer player)
     {
         //Search every item in the player's main inventory for a basket
@@ -104,12 +108,12 @@ public class ItemFlowerBasket extends Item
             }
         }
         
-        return null;
+        return ItemStack.EMPTY;
     }
     
-    public static boolean isBasketOpen(ItemStack stack)
+    public static boolean isBasketOpen(@Nonnull ItemStack stack)
     {
-        if (stack != null && stack.getItem() instanceof ItemFlowerBasket && stack.hasTagCompound())
+        if (!stack.isEmpty() && stack.getItem() instanceof ItemFlowerBasket && stack.hasTagCompound())
         {
             NBTTagCompound compound = stack.getTagCompound();
             
@@ -131,7 +135,7 @@ public class ItemFlowerBasket extends Item
         }
     }
     
-    public static void closeIfBasket(ItemStack stack)
+    public static void closeIfBasket(@Nonnull ItemStack stack)
     {
         //Validate to ensure the stack is a basket and it is open
         if (isBasketOpen(stack))
@@ -142,11 +146,11 @@ public class ItemFlowerBasket extends Item
         }
     }
     
-    public static boolean isStackSuitableForBasket(ItemStack stack)
+    public static boolean isStackSuitableForBasket(@Nonnull ItemStack stack)
     {
         Item item = stack.getItem();
         Block block = Block.getBlockFromItem(item);
         
-        return !(item instanceof ItemFlowerBasket) && block != null && (block instanceof IPlantable || block instanceof IGrowable || block instanceof IShearable);
+        return !(item instanceof ItemFlowerBasket) && (block instanceof IPlantable || block instanceof IGrowable || block instanceof IShearable);
     }
 }

src/main/java/biomesoplenty/common/util/entity/PlayerUtil.java

@@ -26,7 +26,7 @@ public class PlayerUtil
         {
             ItemStack heldStack = player.getHeldItem(hand);
             
-            if (heldStack != null && heldStack.getItem() == item && heldStack.getMetadata() == meta)
+            if (!heldStack.isEmpty() && heldStack.getItem() == item && heldStack.getMetadata() == meta)
                 return hand;
         }