234 lines
6.0 KiB
Java
234 lines
6.0 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2020.
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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;
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import net.minecraft.item.ItemStack;
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import net.minecraft.nbt.CompoundNBT;
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import net.minecraft.nbt.ListNBT;
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import net.minecraft.util.NonNullList;
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import net.minecraftforge.common.util.Constants;
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import net.minecraftforge.common.util.INBTSerializable;
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import javax.annotation.Nonnull;
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public class ItemStackHandler implements IItemHandler, IItemHandlerModifiable, INBTSerializable<CompoundNBT>
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{
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protected NonNullList<ItemStack> stacks;
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public ItemStackHandler()
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{
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this(1);
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}
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public ItemStackHandler(int size)
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{
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stacks = NonNullList.withSize(size, ItemStack.EMPTY);
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}
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public ItemStackHandler(NonNullList<ItemStack> stacks)
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{
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this.stacks = stacks;
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}
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public void setSize(int size)
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{
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stacks = NonNullList.withSize(size, 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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validateSlotIndex(slot);
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this.stacks.set(slot, stack);
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onContentsChanged(slot);
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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 stacks.size();
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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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validateSlotIndex(slot);
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return this.stacks.get(slot);
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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 (stack.isEmpty())
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return ItemStack.EMPTY;
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if (!isItemValid(slot, stack))
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return stack;
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validateSlotIndex(slot);
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ItemStack existing = this.stacks.get(slot);
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int limit = getStackLimit(slot, stack);
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if (!existing.isEmpty())
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{
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if (!ItemHandlerHelper.canItemStacksStack(stack, existing))
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return stack;
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limit -= existing.getCount();
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}
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if (limit <= 0)
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return stack;
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boolean reachedLimit = stack.getCount() > limit;
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if (!simulate)
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{
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if (existing.isEmpty())
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{
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this.stacks.set(slot, reachedLimit ? ItemHandlerHelper.copyStackWithSize(stack, limit) : stack);
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}
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else
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{
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existing.grow(reachedLimit ? limit : stack.getCount());
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}
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onContentsChanged(slot);
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}
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return reachedLimit ? ItemHandlerHelper.copyStackWithSize(stack, stack.getCount()- limit) : ItemStack.EMPTY;
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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 (amount == 0)
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return ItemStack.EMPTY;
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validateSlotIndex(slot);
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ItemStack existing = this.stacks.get(slot);
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if (existing.isEmpty())
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return ItemStack.EMPTY;
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int toExtract = Math.min(amount, existing.getMaxStackSize());
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if (existing.getCount() <= toExtract)
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{
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if (!simulate)
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{
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this.stacks.set(slot, ItemStack.EMPTY);
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onContentsChanged(slot);
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return existing;
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}
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else
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{
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return existing.copy();
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}
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}
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else
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{
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if (!simulate)
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{
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this.stacks.set(slot, ItemHandlerHelper.copyStackWithSize(existing, existing.getCount() - toExtract));
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onContentsChanged(slot);
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}
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return ItemHandlerHelper.copyStackWithSize(existing, toExtract);
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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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return 64;
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}
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protected int getStackLimit(int slot, @Nonnull ItemStack stack)
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{
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return Math.min(getSlotLimit(slot), stack.getMaxStackSize());
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}
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@Override
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public boolean isItemValid(int slot, @Nonnull ItemStack stack)
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{
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return true;
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}
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@Override
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public CompoundNBT serializeNBT()
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{
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ListNBT nbtTagList = new ListNBT();
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for (int i = 0; i < stacks.size(); i++)
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{
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if (!stacks.get(i).isEmpty())
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{
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CompoundNBT itemTag = new CompoundNBT();
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itemTag.putInt("Slot", i);
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stacks.get(i).write(itemTag);
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nbtTagList.add(itemTag);
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}
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}
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CompoundNBT nbt = new CompoundNBT();
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nbt.put("Items", nbtTagList);
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nbt.putInt("Size", stacks.size());
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return nbt;
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}
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@Override
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public void deserializeNBT(CompoundNBT nbt)
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{
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setSize(nbt.contains("Size", Constants.NBT.TAG_INT) ? nbt.getInt("Size") : stacks.size());
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ListNBT tagList = nbt.getList("Items", Constants.NBT.TAG_COMPOUND);
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for (int i = 0; i < tagList.size(); i++)
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{
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CompoundNBT itemTags = tagList.getCompound(i);
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int slot = itemTags.getInt("Slot");
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if (slot >= 0 && slot < stacks.size())
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{
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stacks.set(slot, ItemStack.read(itemTags));
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}
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}
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onLoad();
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}
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protected void validateSlotIndex(int slot)
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{
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if (slot < 0 || slot >= stacks.size())
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throw new RuntimeException("Slot " + slot + " not in valid range - [0," + stacks.size() + ")");
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}
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protected void onLoad()
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{
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}
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protected void onContentsChanged(int slot)
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{
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}
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}
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