Fixes #3776: Fixes dupe bug with cell upgrades. (#3874)

src/main/java/appeng/util/inv/WrapperSupplierItemHandler.java

@@ -0,0 +1,81 @@
+/*
+ * This file is part of Applied Energistics 2.
+ * Copyright (c) 2013 - 2017, AlgorithmX2, All rights reserved.
+ *
+ * Applied Energistics 2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Applied Energistics 2 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
+ */
+
+package appeng.util.inv;
+
+
+import java.util.function.Supplier;
+
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.items.IItemHandler;
+import net.minecraftforge.items.IItemHandlerModifiable;
+
+import appeng.util.helpers.ItemHandlerUtil;
+
+
+public class WrapperSupplierItemHandler implements IItemHandlerModifiable
+{
+	private final Supplier<IItemHandler> sourceHandler;
+
+	public WrapperSupplierItemHandler( Supplier<IItemHandler> source )
+	{
+		this.sourceHandler = source;
+	}
+
+	@Override
+	public int getSlots()
+	{
+		return this.sourceHandler.get().getSlots();
+	}
+
+	@Override
+	public ItemStack getStackInSlot( int slot )
+	{
+		return this.sourceHandler.get().getStackInSlot( slot );
+	}
+
+	@Override
+	public ItemStack insertItem( int slot, ItemStack stack, boolean simulate )
+	{
+		return this.sourceHandler.get().insertItem( slot, stack, simulate );
+	}
+
+	@Override
+	public ItemStack extractItem( int slot, int amount, boolean simulate )
+	{
+		return this.sourceHandler.get().extractItem( slot, amount, simulate );
+	}
+
+	@Override
+	public int getSlotLimit( int slot )
+	{
+		return this.sourceHandler.get().getSlotLimit( slot );
+	}
+
+	@Override
+	public void setStackInSlot( int slot, ItemStack stack )
+	{
+		ItemHandlerUtil.setStackInSlot( this.sourceHandler.get(), slot, stack );
+	}
+
+	@Override
+	public boolean isItemValid( int slot, ItemStack stack )
+	{
+		return this.sourceHandler.get().isItemValid( slot, stack );
+	}
+}