61 lines
2.4 KiB
Java
61 lines
2.4 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2021 ViaVersion and contributors
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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package us.myles.ViaVersion.api.platform.providers;
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import org.checkerframework.checker.nullness.qual.Nullable;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class ViaProviders {
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private final Map<Class<? extends Provider>, Provider> providers = new HashMap<>();
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private final List<Class<? extends Provider>> lonelyProviders = new ArrayList<>();
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public void require(Class<? extends Provider> provider) {
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lonelyProviders.add(provider);
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}
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public <T extends Provider> void register(Class<T> provider, T value) {
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providers.put(provider, value);
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}
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public <T extends Provider> void use(Class<T> provider, T value) {
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lonelyProviders.remove(provider);
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providers.put(provider, value);
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}
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public @Nullable <T extends Provider> T get(Class<T> provider) {
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Provider rawProvider = providers.get(provider);
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if (rawProvider != null) {
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return (T) rawProvider;
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} else {
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if (lonelyProviders.contains(provider)) {
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throw new IllegalStateException("There was no provider for " + provider + ", one is required!");
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}
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return null;
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}
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}
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}
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