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Use LambdaMetafactory instead of classic reflection whenever possible (…
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58 changes: 58 additions & 0 deletions
58
plugin/src/main/java/net/elytrium/limboapi/utils/LambdaUtil.java
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| /* | ||
| * Copyright (C) 2021 - 2024 Elytrium | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
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| package net.elytrium.limboapi.utils; | ||
|
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| import java.lang.invoke.LambdaMetafactory; | ||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.invoke.MethodType; | ||
| import java.lang.reflect.Field; | ||
| import java.util.function.BiConsumer; | ||
| import java.util.function.Function; | ||
|
|
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| public final class LambdaUtil { | ||
| private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup(); | ||
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|
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| public static <T, R> Function<T, R> getterOf(Field field) throws Throwable { | ||
| MethodHandle handle = LOOKUP.unreflectGetter(field); | ||
| MethodType type = handle.type(); | ||
| //noinspection unchecked | ||
| return (Function<T, R>) LambdaMetafactory.metafactory( | ||
| LOOKUP, | ||
| "apply", | ||
| MethodType.methodType(Function.class, MethodHandle.class), | ||
| type.generic(), | ||
| MethodHandles.exactInvoker(type), | ||
| type | ||
| ).getTarget().invokeExact(handle); | ||
| } | ||
|
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| public static <T, R> BiConsumer<T, R> setterOf(Field f) throws Throwable { | ||
| MethodHandle handle = LOOKUP.unreflectSetter(f); | ||
| MethodType type = handle.type(); | ||
| //noinspection unchecked | ||
| return (BiConsumer<T, R>) LambdaMetafactory.metafactory( | ||
| LOOKUP, | ||
| "accept", | ||
| MethodType.methodType(BiConsumer.class, MethodHandle.class), | ||
| type.generic().changeReturnType(void.class), | ||
| MethodHandles.exactInvoker(type), | ||
| type | ||
| ).getTarget().invokeExact(handle); | ||
| } | ||
| } |