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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;

/**

* 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(MaybeObserver<? super T> observer);

}