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src/main/java/io/reactivex/rxjava4/internal/fuseable/FuseToMaybe.java
47 строк
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akarnokd
Package shift from .rxjava3 to .rxjava4
18 мар 2026, 18:10
18 мар 2026, 18:10
31e32bf
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/* * Copyright (c) 2016-present, RxJava Contributors. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License is * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See * the License for the specific language governing permissions and limitations under the License. */ package io.reactivex.rxjava4.internal.fuseable; import io.reactivex.rxjava4.annotations.NonNull; import io.reactivex.rxjava4.core.Maybe; /** * Interface indicating an operator implementation can be macro-fused back to Maybe in case * the operator goes from Maybe to some other reactive type and then the sequence calls * for toMaybe again: * <pre> * {@code * Single<Integer> single = Maybe.just(1).isEmpty(); * Maybe<Integer> maybe = single.toMaybe(); * } * </pre> * * The {@code Single.toMaybe()} will check for this interface and call the {@link #fuseToMaybe()} * to return a Maybe which could be the Maybe-specific implementation of isEmpty(). * <p> * This causes a slight overhead in assembly time (1 instanceof check, 1 operator allocation and 1 dropped * operator) but does not incur the conversion overhead at runtime. * * @param <T> the value type */ public interface FuseToMaybe<@NonNull T> { /** * Returns a (direct) Maybe for the operator. * <p>The implementation should handle the necessary RxJavaPlugins wrapping. * @return the Maybe instance */ @NonNull Maybe<T> fuseToMaybe(); }