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/*
 * Copyright (c) 2011-2017 Pivotal Software Inc, All Rights Reserved.
 *
 * 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 reactor.core.publisher;

import java.util.Objects;

import reactor.core.CoreSubscriber;

/**
 * Emits a default value if the wrapped Mono is empty.
 * @param  the value type
 */
final class MonoDefaultIfEmpty extends MonoOperator {
    final T defaultValue;

    MonoDefaultIfEmpty(Mono source, T defaultValue) {
        super(source);
        this.defaultValue = Objects.requireNonNull(defaultValue, "defaultValue");
    }
    
    @Override
    public void subscribe(CoreSubscriber actual) {
        source.subscribe(new FluxDefaultIfEmpty.DefaultIfEmptySubscriber<>(actual, defaultValue));
    }
}