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/*
 * Copyright (c) 2016-2023 VMware Inc. or its affiliates, 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
 *
 *   https://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 org.reactivestreams.Publisher;
import reactor.core.CoreSubscriber;
import reactor.util.annotation.Nullable;

import java.util.Iterator;
import java.util.Objects;

final class MonoFirstWithValue extends Mono implements SourceProducer {

	final Mono[] array;

	final Iterable> iterable;

	private MonoFirstWithValue(Mono[] array) {
		this.array = Objects.requireNonNull(array, "array");
		this.iterable = null;
	}

	@SafeVarargs
	MonoFirstWithValue(Mono first, Mono... others) {
		Objects.requireNonNull(first, "first");
		Objects.requireNonNull(others, "others");
		@SuppressWarnings("unchecked") Mono[] newArray = new Mono[others.length + 1];
		newArray[0] = first;
		System.arraycopy(others, 0, newArray, 1, others.length);
		this.array = newArray;
		this.iterable = null;
	}

	MonoFirstWithValue(Iterable> iterable) {
		this.array = null;
		this.iterable = Objects.requireNonNull(iterable);
	}

	/**
	 * Returns a new instance which has the additional sources to be flattened together with
	 * the current array of sources.
	 * 

* This operation doesn't change the current {@link MonoFirstWithValue} instance. * * @param others the new sources to merge with the current sources * * @return the new {@link MonoFirstWithValue} instance or null if new sources cannot be added (backed by an Iterable) */ @Nullable @SafeVarargs final MonoFirstWithValue firstValuedAdditionalSources(Mono... others) { Objects.requireNonNull(others, "others"); if (others.length == 0) { return this; } if (array == null) { //iterable mode, returning null to convey 2 nested operators are needed here return null; } int currentSize = array.length; int otherSize = others.length; @SuppressWarnings("unchecked") Mono[] newArray = new Mono[currentSize + otherSize]; System.arraycopy(array, 0, newArray, 0, currentSize); System.arraycopy(others, 0, newArray, currentSize, otherSize); return new MonoFirstWithValue<>(newArray); } @Override @SuppressWarnings("unchecked") public void subscribe(CoreSubscriber actual) { Publisher[] a = array; int n; if (a == null) { n = 0; a = new Publisher[8]; Iterator> it; try { it = Objects.requireNonNull(iterable.iterator(), "The iterator returned is null"); } catch (Throwable e) { Operators.error(actual, Operators.onOperatorError(e, actual.currentContext())); return; } for (; ; ) { boolean b; try { b = it.hasNext(); } catch (Throwable e) { Operators.error(actual, Operators.onOperatorError(e, actual.currentContext())); return; } if (!b) { break; } Publisher p; try { p = Objects.requireNonNull(it.next(), "The Publisher returned by the iterator is null"); } catch (Throwable e) { Operators.error(actual, Operators.onOperatorError(e, actual.currentContext())); return; } if (n == a.length) { Publisher[] c = new Publisher[n + (n >> 2)]; System.arraycopy(a, 0, c, 0, n); a = c; } a[n++] = p; } } else { n = a.length; } if (n == 0) { Operators.complete(actual); return; } if (n == 1) { Publisher p = Mono.from(a[0]); if (p == null) { Operators.error(actual, Operators.onOperatorError(new NullPointerException("The single source Publisher is null"), actual.currentContext())); } else { p.subscribe(actual); } return; } FluxFirstWithValue.RaceValuesCoordinator coordinator = new FluxFirstWithValue.RaceValuesCoordinator<>(n); coordinator.subscribe(a, n, actual); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return SourceProducer.super.scanUnsafe(key); } }





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