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Reactive Extensions for Java
/**
* 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.internal.fuseable;
import io.reactivex.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:
*
* Single<Integer> single = Maybe.just(1).isEmpty();
* Maybe<Integer> maybe = single.toMaybe();
*
*
* 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().
*
* 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 the value type
*/
public interface FuseToMaybe {
/**
* Returns a (direct) Maybe for the operator.
* The implementation should handle the necessary RxJavaPlugins wrapping.
* @return the Maybe instance
*/
Maybe fuseToMaybe();
}
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