mirror of https://github.com/GeyserMC/Geyser.git
76 lines
3.2 KiB
Java
76 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.connector.registry.loader;
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import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
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import org.geysermc.connector.utils.FileUtils;
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import java.lang.annotation.Annotation;
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import java.util.Map;
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import java.util.function.Function;
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/**
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* A mapped registry loader which takes in a {@link String} and returns a transformed
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* {@link Annotation} as the value. The {@link R} represents the final result as mapped
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* by the {@link A}, the annotation. This function exists in this registry loader for
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* the purpose of annotations not often being used as a map key. The {@link V} generic
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* represents the actual map value of what is expected. The function transformation done
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* is used for transforming the key, however the value is not expected to be transformed.
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*
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* <p>
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* Keep in mind that this annotation transforming does NOT need to be done, and can be
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* replaced with a simple <code>Function.identity()</code> if not desired.
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*
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* <p>
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* See {@link BlockEntityRegistryLoader} and {@link SoundHandlerRegistryLoader} as a
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* good example of these registry loaders in use.
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*
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* @param <R> the final result as transformed by the function
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* @param <A> the raw annotation itself can be transformed
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* @param <V> the value
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*/
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public class AnnotatedRegistryLoader<R, A extends Annotation, V> implements RegistryLoader<String, Map<R, V>> {
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private final Class<A> annotation;
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private final Function<A, R> mapper;
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public AnnotatedRegistryLoader(Class<A> annotation, Function<A, R> mapper) {
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this.annotation = annotation;
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this.mapper = mapper;
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}
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@Override
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public Map<R, V> load(String input) {
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Map<R, V> entries = new Object2ObjectOpenHashMap<>();
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for (Class<?> clazz : FileUtils.getGeneratedClassesForAnnotation(input)) {
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try {
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entries.put(this.mapper.apply(clazz.getAnnotation(this.annotation)), (V) clazz.newInstance());
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} catch (InstantiationException | IllegalAccessException ex) {
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ex.printStackTrace();
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}
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}
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return entries;
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}
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} |