/**
* 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;
import io.reactivex.annotations.*;
/**
* Represents a basic {@link Maybe} source base interface,
* consumable via an {@link MaybeObserver}.
* <p>
* This class also serves the base type for custom operators wrapped into
* Maybe via {@link Maybe#create(MaybeOnSubscribe)}.
*
* @param <T> the element type
* @since 2.0
*/
public interface MaybeSource<T> {
/**
* Subscribes the given MaybeObserver to this MaybeSource instance.
* @param observer the MaybeObserver, not null
* @throws NullPointerException if {@code observer} is null
*/
void subscribe(@NonNull MaybeObserver<? super T> observer);
}