Use IItemHandler instead of IInventory internally (#2971)

* Use IItemHandler instead of IInventory internally

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

@@ -0,0 +1,129 @@
+/*
+ * 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 javax.annotation.Nonnull;
+
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.items.IItemHandler;
+
+import appeng.util.helpers.ItemHandlerUtil;
+
+
+public class WrapperRangeItemHandler implements IInternalItemHandler
+{
+	private final IItemHandler compose;
+	private final int minSlot;
+	private final int maxSlot;
+
+	public WrapperRangeItemHandler( IItemHandler compose, int minSlot, int maxSlotExclusive )
+	{
+		this.compose = compose;
+		this.minSlot = minSlot;
+		this.maxSlot = maxSlotExclusive;
+	}
+
+	@Override
+	public int getSlots()
+	{
+		return maxSlot - minSlot;
+	}
+
+	@Override
+	@Nonnull
+	public ItemStack getStackInSlot( int slot )
+	{
+		if( checkSlot( slot ) )
+		{
+			return compose.getStackInSlot( slot + minSlot );
+		}
+
+		return ItemStack.EMPTY;
+	}
+
+	@Override
+	@Nonnull
+	public ItemStack insertItem( int slot, @Nonnull ItemStack stack, boolean simulate )
+	{
+		if( checkSlot( slot ) )
+		{
+			return compose.insertItem( slot + minSlot, stack, simulate );
+		}
+
+		return stack;
+	}
+
+	@Override
+	@Nonnull
+	public ItemStack extractItem( int slot, int amount, boolean simulate )
+	{
+		if( checkSlot( slot ) )
+		{
+			return compose.extractItem( slot + minSlot, amount, simulate );
+		}
+
+		return ItemStack.EMPTY;
+	}
+
+	@Override
+	public void setStackInSlot( int slot, @Nonnull ItemStack stack )
+	{
+		if( checkSlot( slot ) )
+		{
+			ItemHandlerUtil.setStackInSlot( compose, slot + minSlot, stack );
+		}
+	}
+
+	@Override
+	public int getSlotLimit( int slot )
+	{
+		if( checkSlot( slot ) )
+		{
+			return compose.getSlotLimit( slot + minSlot );
+		}
+
+		return 0;
+	}
+
+	private boolean checkSlot( int localSlot )
+	{
+		return localSlot + minSlot < maxSlot;
+	}
+
+	@Override
+	public boolean isItemValidForSlot( int slot, ItemStack stack )
+	{
+		if( checkSlot( slot ) )
+		{
+			return ItemHandlerUtil.isItemValidForSlot( compose, slot + minSlot, stack );
+		}
+		return false;
+	}
+
+	@Override
+	public void markDirty( int slot )
+	{
+		if( checkSlot( slot ) )
+		{
+			ItemHandlerUtil.markDirty( compose, slot + minSlot );
+		}
+	}
+
+}