58 lines
1.9 KiB
Java
58 lines
1.9 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.common.util;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.function.Supplier;
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import net.minecraft.tags.ITag;
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import net.minecraft.tags.ITagCollection;
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import net.minecraft.util.ResourceLocation;
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public class ReverseTagWrapper<T>
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{
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private final T target;
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private final Supplier<ITagCollection<T>> colSupplier;
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//This map is immutable we track its identity change.
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private Map<ResourceLocation, ITag<T>> colCache;
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private Set<ResourceLocation> cache = null;
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public ReverseTagWrapper(T target, Supplier<ITagCollection<T>> colSupplier)
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{
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this.target = target;
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this.colSupplier = colSupplier;
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}
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public Set<ResourceLocation> getTagNames()
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{
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ITagCollection<T> collection = colSupplier.get();
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if (cache == null || colCache != collection.getIDTagMap()) // Identity equals.
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{
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this.cache = Collections.unmodifiableSet(new HashSet<>(collection.getOwningTags(target)));
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this.colCache = collection.getIDTagMap();
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}
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return this.cache;
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}
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}
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