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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) 2011-2018 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 java.util.function.BiFunction;
import java.util.function.Consumer;

import org.reactivestreams.Publisher;
import reactor.core.CoreSubscriber;
import reactor.core.Disposable;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;

/**
 * @author Simon Baslé
 */
final class ConnectableLift extends ConnectableFlux implements Scannable {

	final BiFunction, ? extends CoreSubscriber>
			lifter;

	final ConnectableFlux source;

	ConnectableLift(ConnectableFlux p,
			BiFunction, ? extends CoreSubscriber> lifter) {
		this.source = Objects.requireNonNull(p, "source");
		this.lifter = lifter;
	}

	@Override
	public int getPrefetch() {
		return source.getPrefetch();
	}

	@Override
	public void connect(Consumer cancelSupport) {
		this.source.connect();
	}

	@Override
	@Nullable
	public Object scanUnsafe(Attr key) {
		if (key == Attr.PREFETCH) return source.getPrefetch();
		if (key == Attr.PARENT) return source;
		return null;
	}

	@Override
	public void subscribe(CoreSubscriber actual) {
		CoreSubscriber input =
				lifter.apply(source, actual);

		Objects.requireNonNull(input, "Lifted subscriber MUST NOT be null");

		source.subscribe(input);
	}
}