2019-09-10 23:02:07 +00:00
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/*
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* Minecraft Forge
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* Copyright (c) 2016-2019.
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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.registries;
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import net.minecraft.util.ResourceLocation;
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import net.minecraftforge.event.RegistryEvent;
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import net.minecraftforge.eventbus.api.IEventBus;
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import net.minecraftforge.fml.RegistryObject;
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2019-09-25 22:01:39 +00:00
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Objects;
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import java.util.function.Supplier;
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2019-09-10 23:02:07 +00:00
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/**
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* Utility class to help with managing registry entries.
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* Maintains a list of all suppliers for entries and registers them during the proper Register event.
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* Suppliers should return NEW instances every time.
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*
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*Example Usage:
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*<pre>
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* private static final DeferredRegister<Item> ITEMS = new DeferredRegister<>(ForgeRegistries.ITEMS, MODID);
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* private static final DeferredRegister<Block> BLOCKS = new DeferredRegister<>(ForgeRegistries.BLOCKS, MODID);
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*
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* public static final RegistryObject<Block> ROCK_BLOCK = BLOCKS.register("rock", () -> new Block(Block.Properties.create(Material.ROCK)));
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* public static final RegistryObject<Item> ROCK_ITEM = ITEMS.register("rock", () -> new BlockItem(ROCK_BLOCK.get(), new Item.Properties().group(ItemGroup.MISC)));
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*
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* public ExampleMod() {
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* ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
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* BLOCKS.register(FMLJavaModLoadingContext.get().getModEventBus());
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* }
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*</pre>
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*
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* @param <T> The base registry type, must be a concrete base class, do not use subclasses or wild cards.
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*/
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public class DeferredRegister<T extends IForgeRegistryEntry<T>>
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{
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private final IForgeRegistry<T> type;
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private final String modid;
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2019-09-25 22:01:39 +00:00
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private Map<RegistryObject<T>, Supplier<? extends T>> entries = new LinkedHashMap<>();
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2019-09-10 23:02:07 +00:00
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public DeferredRegister(IForgeRegistry<T> reg, String modid)
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{
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this.type = reg;
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this.modid = modid;
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}
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/**
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* Adds a new supplier to the list of entries to be registered, and returns a RegistryObject that will be populated with the created entry automatically.
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*
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* @param name The new entry's name, it will automatically have the modid prefixed.
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* @param sup A factory for the new entry, it should return a new instance every time it is called.
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* @return A RegistryObject that will be updated with when the entries in the registry change.
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*/
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2019-09-25 22:01:39 +00:00
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@SuppressWarnings("unchecked")
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2019-09-27 21:54:52 +00:00
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public <I extends T> RegistryObject<I> register(final String name, final Supplier<? extends I> sup)
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2019-09-10 23:02:07 +00:00
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{
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Objects.requireNonNull(name);
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Objects.requireNonNull(sup);
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2019-09-10 23:02:07 +00:00
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final ResourceLocation key = new ResourceLocation(modid, name);
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2019-09-25 22:01:39 +00:00
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RegistryObject<I> ret = RegistryObject.of(key, this.type);
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if (entries.putIfAbsent((RegistryObject<T>) ret, () -> sup.get().setRegistryName(key)) != null) {
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throw new IllegalArgumentException("Duplicate registration " + name);
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}
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return ret;
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2019-09-10 23:02:07 +00:00
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}
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/**
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* Adds our event handler to the specified event bus, this MUST be called in order for this class to function.
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* See the example usage.
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*
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* @param bus The Mod Specific event bus.
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*/
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public void register(IEventBus bus)
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{
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bus.addListener(this::addEntries);
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}
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private void addEntries(RegistryEvent.Register<?> event)
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{
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if (event.getGenericType() == this.type.getRegistrySuperType())
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{
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@SuppressWarnings("unchecked")
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IForgeRegistry<T> reg = (IForgeRegistry<T>)event.getRegistry();
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2019-09-25 22:01:39 +00:00
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for (Entry<RegistryObject<T>, Supplier<? extends T>> e : entries.entrySet())
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{
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reg.register(e.getValue().get());
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e.getKey().updateReference(reg);
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}
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2019-09-10 23:02:07 +00:00
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}
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}
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}
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