/*
 * 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
 *
 *       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.util.function;

import java.util.Objects;
import java.util.function.Function;

import reactor.util.annotation.NonNull;
import reactor.util.annotation.Nullable;

A tuple that holds eight values
Author:
Jon Brisbin, Stephane Maldini
Type parameters:
<T1> – The type of the first value held by this tuple
<T2> – The type of the second value held by this tuple
<T3> – The type of the third value held by this tuple
<T4> – The type of the fourth value held by this tuple
<T5> – The type of the fifth value held by this tuple
<T6> – The type of the sixth value held by this tuple
<T7> – The type of the seventh value held by this tuple
<T8> – The type of the eighth value held by this tuple/**
 * A tuple that holds eight values
 *
 * @param <T1> The type of the first value held by this tuple
 * @param <T2> The type of the second value held by this tuple
 * @param <T3> The type of the third value held by this tuple
 * @param <T4> The type of the fourth value held by this tuple
 * @param <T5> The type of the fifth value held by this tuple
 * @param <T6> The type of the sixth value held by this tuple
 * @param <T7> The type of the seventh value held by this tuple
 * @param <T8> The type of the eighth value held by this tuple
 * @author Jon Brisbin
 * @author Stephane Maldini
 */
public class Tuple8<T1, T2, T3, T4, T5, T6, T7, T8> extends
                                                    Tuple7<T1, T2, T3, T4, T5, T6, T7> {

	private static final long serialVersionUID = -8746796646535446242L;

	@NonNull final T8 t8;

	Tuple8(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8) {
		super(t1, t2, t3, t4, t5, t6, t7);
		this.t8 = Objects.requireNonNull(t8, "t8");
	}

	
Type-safe way to get the eighth object of this Tuples. 
Returns:
The eighth object/**
	 * Type-safe way to get the eighth object of this {@link Tuples}.
	 *
	 * @return The eighth object
	 */
	public T8 getT8() {
		return t8;
	}

	
Map the 1st part (T1) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T1 part
Type parameters:
<R> – the new type for the T1 part
Returns:
a new Tuple8 with a different T1 value/**
	 * Map the 1st part (T1) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T1 part
	 * @param <R> the new type for the T1 part
	 * @return a new {@link Tuple8} with a different T1 value
	 */
	public <R> Tuple8<R, T2, T3, T4, T5, T6, T7, T8> mapT1(Function<T1, R> mapper) {
		return new Tuple8<>(mapper.apply(t1), t2, t3, t4, t5, t6, t7, t8);
	}

	
Map the 2nd part (T2) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T2 part
Type parameters:
<R> – the new type for the T2 part
Returns:
a new Tuple8 with a different T2 value/**
	 * Map the 2nd part (T2) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T2 part
	 * @param <R> the new type for the T2 part
	 * @return a new {@link Tuple8} with a different T2 value
	 */
	public <R> Tuple8<T1, R, T3, T4, T5, T6, T7, T8> mapT2(Function<T2, R> mapper) {
		return new Tuple8<>(t1, mapper.apply(t2), t3, t4, t5, t6, t7, t8);
	}

	
Map the 3rd part (T3) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T3 part
Type parameters:
<R> – the new type for the T3 part
Returns:
a new Tuple8 with a different T3 value/**
	 * Map the 3rd part (T3) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T3 part
	 * @param <R> the new type for the T3 part
	 * @return a new {@link Tuple8} with a different T3 value
	 */
	public <R> Tuple8<T1, T2, R, T4, T5, T6, T7, T8> mapT3(Function<T3, R> mapper) {
		return new Tuple8<>(t1, t2, mapper.apply(t3), t4, t5, t6, t7, t8);
	}

	
Map the 4th part (T4) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T4 part
Type parameters:
<R> – the new type for the T4 part
Returns:
a new Tuple8 with a different T4 value/**
	 * Map the 4th part (T4) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T4 part
	 * @param <R> the new type for the T4 part
	 * @return a new {@link Tuple8} with a different T4 value
	 */
	public <R> Tuple8<T1, T2, T3, R, T5, T6, T7, T8> mapT4(Function<T4, R> mapper) {
		return new Tuple8<>(t1, t2, t3, mapper.apply(t4), t5, t6, t7, t8);
	}

	
Map the 5th part (T5) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T5 part
Type parameters:
<R> – the new type for the T5 part
Returns:
a new Tuple8 with a different T5 value/**
	 * Map the 5th part (T5) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T5 part
	 * @param <R> the new type for the T5 part
	 * @return a new {@link Tuple8} with a different T5 value
	 */
	public <R> Tuple8<T1, T2, T3, T4, R, T6, T7, T8> mapT5(Function<T5, R> mapper) {
		return new Tuple8<>(t1, t2, t3, t4, mapper.apply(t5), t6, t7, t8);
	}

	
Map the 6th part (T6) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T6 part
Type parameters:
<R> – the new type for the T6 part
Returns:
a new Tuple8 with a different T6 value/**
	 * Map the 6th part (T6) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T6 part
	 * @param <R> the new type for the T6 part
	 * @return a new {@link Tuple8} with a different T6 value
	 */
	public <R> Tuple8<T1, T2, T3, T4, T5, R, T7, T8> mapT6(Function<T6, R> mapper) {
		return new Tuple8<>(t1, t2, t3, t4, t5, mapper.apply(t6), t7, t8);
	}

	
Map the 7th part (T7) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T7 part
Type parameters:
<R> – the new type for the T7 part
Returns:
a new Tuple8 with a different T7 value/**
	 * Map the 7th part (T7) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T7 part
	 * @param <R> the new type for the T7 part
	 * @return a new {@link Tuple8} with a different T7 value
	 */
	public <R> Tuple8<T1, T2, T3, T4, T5, T6, R, T8> mapT7(Function<T7, R> mapper) {
		return new Tuple8<>(t1, t2, t3, t4, t5, t6, mapper.apply(t7), t8);
	}

	
Map the 8th part (t8) of this Tuple8 into a different value and type, keeping the other parts. 
Params:
mapper – the mapping Function for the T8 part
Type parameters:
<R> – the new type for the T8 part
Returns:
a new Tuple8 with a different T8 value/**
	 * Map the 8th part (t8) of this {@link Tuple8} into a different value and type,
	 * keeping the other parts.
	 *
	 * @param mapper the mapping {@link Function} for the T8 part
	 * @param <R> the new type for the T8 part
	 * @return a new {@link Tuple8} with a different T8 value
	 */
	public <R> Tuple8<T1, T2, T3, T4, T5, T6, T7, R> mapT8(Function<T8, R> mapper) {
		return new Tuple8<>(t1, t2, t3, t4, t5, t6, t7, mapper.apply(t8));
	}

	@Nullable
	@Override
	public Object get(int index) {
		switch (index) {
			case 0:
				return t1;
			case 1:
				return t2;
			case 2:
				return t3;
			case 3:
				return t4;
			case 4:
				return t5;
			case 5:
				return t6;
			case 6:
				return t7;
			case 7:
				return t8;
			default:
				return null;
		}
	}

	@Override
	public Object[] toArray() {
		return new Object[]{t1, t2, t3, t4, t5, t6, t7, t8};
	}

	@Override
	public boolean equals(@Nullable Object o) {
		if (this == o) return true;
		if (!(o instanceof Tuple8)) return false;
		if (!super.equals(o)) return false;

		@SuppressWarnings("rawtypes")
        Tuple8 tuple8 = (Tuple8) o;

		return t8.equals(tuple8.t8);

	}

	@Override
	public int hashCode() {
		int result = super.hashCode();
		result = 31 * result + t8.hashCode();
		return result;
	}

	@Override
	public int size() {
		return 8;
	}
}