114 lines
2.9 KiB
Java
114 lines
2.9 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.items.wrapper;
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import com.google.common.base.Preconditions;
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import net.minecraft.item.ItemStack;
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import net.minecraftforge.items.IItemHandlerModifiable;
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import javax.annotation.Nonnull;
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/**
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* A wrapper that composes another IItemHandlerModifiable, exposing only a range of the composed slots.
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* Shifting of slot indices is handled automatically for you.
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*/
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public class RangedWrapper implements IItemHandlerModifiable {
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private final IItemHandlerModifiable compose;
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private final int minSlot;
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private final int maxSlot;
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public RangedWrapper(IItemHandlerModifiable compose, int minSlot, int maxSlotExclusive)
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{
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Preconditions.checkArgument(maxSlotExclusive > minSlot, "Max slot must be greater than min slot");
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this.compose = compose;
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this.minSlot = minSlot;
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this.maxSlot = maxSlotExclusive;
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}
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@Override
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public int getSlots()
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{
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return maxSlot - minSlot;
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}
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@Override
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@Nonnull
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public ItemStack getStackInSlot(int slot)
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{
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if (checkSlot(slot))
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{
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return compose.getStackInSlot(slot + minSlot);
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}
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return ItemStack.EMPTY;
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}
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@Override
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@Nonnull
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public ItemStack insertItem(int slot, @Nonnull ItemStack stack, boolean simulate)
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{
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if (checkSlot(slot))
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{
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return compose.insertItem(slot + minSlot, stack, simulate);
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}
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return stack;
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}
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@Override
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@Nonnull
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public ItemStack extractItem(int slot, int amount, boolean simulate)
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{
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if (checkSlot(slot))
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{
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return compose.extractItem(slot + minSlot, amount, simulate);
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}
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return ItemStack.EMPTY;
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}
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@Override
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public void setStackInSlot(int slot, @Nonnull ItemStack stack)
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{
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if (checkSlot(slot))
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{
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compose.setStackInSlot(slot + minSlot, stack);
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}
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}
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@Override
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public int getSlotLimit(int slot)
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{
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if (checkSlot(slot))
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{
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return compose.getSlotLimit(slot + minSlot);
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}
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return 0;
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}
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private boolean checkSlot(int localSlot)
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{
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return localSlot + minSlot < maxSlot;
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}
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}
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