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/*
 * This file is part of "lunisolar-magma".
 *
 * (C) Copyright 2014-2019 Lunisolar (http://lunisolar.eu/).
 *
 * 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 eu.lunisolar.magma.func.operator.unary;

import javax.annotation.Nonnull; // NOSONAR
import javax.annotation.Nullable; // NOSONAR
import java.util.Comparator; // NOSONAR
import java.util.Objects; // NOSONAR
import eu.lunisolar.magma.basics.*; //NOSONAR
import eu.lunisolar.magma.basics.builder.*; // NOSONAR
import eu.lunisolar.magma.basics.exceptions.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.aType.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.type.*; // NOSONAR
import eu.lunisolar.magma.basics.meta.functional.domain.*; // NOSONAR
import eu.lunisolar.magma.func.IA;
import eu.lunisolar.magma.func.SA;
import eu.lunisolar.magma.func.*; // NOSONAR
import eu.lunisolar.magma.func.tuple.*; // NOSONAR
import java.util.function.*; // NOSONAR
import java.util.*; // NOSONAR
import java.lang.reflect.*;

import eu.lunisolar.magma.func.action.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.bi.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.obj.*; // NOSONAR
import eu.lunisolar.magma.func.consumer.primitives.tri.*; // NOSONAR
import eu.lunisolar.magma.func.function.*; // NOSONAR
import eu.lunisolar.magma.func.function.conversion.*; // NOSONAR
import eu.lunisolar.magma.func.function.from.*; // NOSONAR
import eu.lunisolar.magma.func.function.to.*; // NOSONAR
import eu.lunisolar.magma.func.operator.binary.*; // NOSONAR
import eu.lunisolar.magma.func.operator.ternary.*; // NOSONAR
import eu.lunisolar.magma.func.operator.unary.*; // NOSONAR
import eu.lunisolar.magma.func.predicate.*; // NOSONAR
import eu.lunisolar.magma.func.supplier.*; // NOSONAR

/**
 * Non-throwing functional interface (lambda) LFltUnaryOperator for Java 8.
 *
 * Type: operator
 *
 * Domain (lvl: 1): float a
 *
 * Co-domain: float
 *
 */
@FunctionalInterface
@SuppressWarnings("UnusedDeclaration")
public interface LFltUnaryOperator extends MetaOperator, MetaInterface.NonThrowing, Codomain, Domain1 { // NOSONAR

	String DESCRIPTION = "LFltUnaryOperator: float applyAsFlt(float a)";

	// float applyAsFlt(float a) ;
	default float applyAsFlt(float a) {
		// return nestingApplyAsFlt(a);
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handling.nestCheckedAndThrow(e);
		}
	}

	/**
	 * Implement this, but call applyAsFlt(float a)
	 */
	float applyAsFltX(float a) throws Throwable;

	default float tupleApplyAsFlt(LFltSingle args) {
		return applyAsFlt(args.value());
	}

	/** Function call that handles exceptions according to the instructions. */
	default float handlingApplyAsFlt(float a, HandlingInstructions handling) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handler.handleOrNest(e, handling);
		}
	}

	default LFltUnaryOperator handling(HandlingInstructions handling) {
		return a -> handlingApplyAsFlt(a, handling);
	}

	default float applyAsFlt(float a, @Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handling.wrap(e, exF, newMessage, messageParams);
		}
	}

	default LFltUnaryOperator trying(@Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
		return a -> applyAsFlt(a, exF, newMessage, messageParams);
	}

	default float applyAsFlt(float a, @Nonnull ExWF exF) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handling.wrap(e, exF);
		}
	}

	default LFltUnaryOperator trying(@Nonnull ExWF exF) {
		return a -> applyAsFlt(a, exF);
	}

	default float applyAsFltThen(float a, @Nonnull LToFltFunction handler) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			Handling.handleErrors(e);
			return handler.applyAsFlt(e);
		}
	}

	default LFltUnaryOperator tryingThen(@Nonnull LToFltFunction handler) {
		return a -> applyAsFltThen(a, handler);
	}

	/** Function call that handles exceptions by always nesting checked exceptions and propagating the others as is. */
	default float nestingApplyAsFlt(float a) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handling.nestCheckedAndThrow(e);
		}
	}

	/** Function call that handles exceptions by always propagating them as is, even when they are undeclared checked ones. */
	default float shovingApplyAsFlt(float a) {
		try {
			return this.applyAsFltX(a);
		} catch (Throwable e) { // NOSONAR
			throw Handling.shoveIt(e);
		}
	}

	static float handlingApplyAsFlt(float a, LFltUnaryOperator func, HandlingInstructions handling) { // <-
		Null.nonNullArg(func, "func");
		return func.handlingApplyAsFlt(a, handling);
	}

	static float tryApplyAsFlt(float a, LFltUnaryOperator func) {
		Null.nonNullArg(func, "func");
		return func.nestingApplyAsFlt(a);
	}

	static float tryApplyAsFlt(float a, LFltUnaryOperator func, @Nonnull ExWMF exF, @Nonnull String newMessage, @Nullable Object... messageParams) {
		Null.nonNullArg(func, "func");
		return func.applyAsFlt(a, exF, newMessage, messageParams);
	}

	static float tryApplyAsFlt(float a, LFltUnaryOperator func, @Nonnull ExWF exF) {
		Null.nonNullArg(func, "func");
		return func.applyAsFlt(a, exF);
	}

	static float tryApplyAsFltThen(float a, LFltUnaryOperator func, @Nonnull LToFltFunction handler) {
		Null.nonNullArg(func, "func");
		return func.applyAsFltThen(a, handler);
	}

	default float failSafeApplyAsFlt(float a, @Nonnull LFltUnaryOperator failSafe) {
		try {
			return applyAsFlt(a);
		} catch (Throwable e) { // NOSONAR
			Handling.handleErrors(e);
			return failSafe.applyAsFlt(a);
		}
	}

	static float failSafeApplyAsFlt(float a, LFltUnaryOperator func, @Nonnull LFltUnaryOperator failSafe) {
		Null.nonNullArg(failSafe, "failSafe");
		if (func == null) {
			return failSafe.applyAsFlt(a);
		} else {
			return func.failSafeApplyAsFlt(a, failSafe);
		}
	}

	static LFltUnaryOperator failSafe(LFltUnaryOperator func, @Nonnull LFltUnaryOperator failSafe) {
		Null.nonNullArg(failSafe, "failSafe");
		return a -> failSafeApplyAsFlt(a, func, failSafe);
	}

	/** Just to mirror the method: Ensures the result is not null */
	default float nonNullApplyAsFlt(float a) {
		return applyAsFlt(a);
	}

	/** Returns description of the functional interface. */
	@Nonnull
	default String functionalInterfaceDescription() {
		return LFltUnaryOperator.DESCRIPTION;
	}

	/** From-To. Intended to be used with non-capturing lambda. */
	public static void fromTo(int min_i, int max_i, float a, LFltUnaryOperator func) {
		Null.nonNullArg(func, "func");
		if (min_i <= max_i) {
			for (int i = min_i; i <= max_i; i++) {
				func.applyAsFlt(a);
			}
		} else {
			for (int i = min_i; i >= max_i; i--) {
				func.applyAsFlt(a);
			}
		}
	}

	/** From-To. Intended to be used with non-capturing lambda. */
	public static void fromTill(int min_i, int max_i, float a, LFltUnaryOperator func) {
		Null.nonNullArg(func, "func");
		if (min_i <= max_i) {
			for (int i = min_i; i < max_i; i++) {
				func.applyAsFlt(a);
			}
		} else {
			for (int i = min_i; i > max_i; i--) {
				func.applyAsFlt(a);
			}
		}
	}

	/** From-To. Intended to be used with non-capturing lambda. */
	public static void times(int max_i, float a, LFltUnaryOperator func) {
		if (max_i < 0)
			return;
		fromTill(0, max_i, a, func);
	}

	/** Captures arguments but delays the evaluation. */
	default LFltSupplier capture(float a) {
		return () -> this.applyAsFlt(a);
	}

	/** Creates function that always returns the same value. */
	static LFltUnaryOperator constant(float r) {
		return a -> r;
	}

	/** Convenient method in case lambda expression is ambiguous for the compiler (that might happen for overloaded methods accepting different interfaces). */
	@Nonnull
	static LFltUnaryOperator fltUnaryOp(final @Nonnull LFltUnaryOperator lambda) {
		Null.nonNullArg(lambda, "lambda");
		return lambda;
	}

	@Nonnull
	static LFltUnaryOperator recursive(final @Nonnull LFunction selfLambda) {
		final LFltUnaryOperatorSingle single = new LFltUnaryOperatorSingle();
		LFltUnaryOperator func = selfLambda.apply(single);
		single.target = func;
		return func;
	}

	final class LFltUnaryOperatorSingle implements LSingle, LFltUnaryOperator {
		private LFltUnaryOperator target = null;

		@Override
		public float applyAsFltX(float a) throws Throwable {
			return target.applyAsFltX(a);
		}

		@Override
		public LFltUnaryOperator value() {
			return target;
		}
	}

	@Nonnull
	static LFltUnaryOperator fltUnaryOpThrowing(final @Nonnull ExF exF) {
		Null.nonNullArg(exF, "exF");
		return a -> {
			throw exF.produce();
		};
	}

	@Nonnull
	static LFltUnaryOperator fltUnaryOpThrowing(final String message, final @Nonnull ExMF exF) {
		Null.nonNullArg(exF, "exF");
		return a -> {
			throw exF.produce(message);
		};
	}

	static float call(float a, final @Nonnull LFltUnaryOperator lambda) {
		Null.nonNullArg(lambda, "lambda");
		return lambda.applyAsFlt(a);
	}

	// 

	// 

	// 

	/** Safe instance. That always returns the same value (as produceFloat). */
	@Nonnull
	static LFltUnaryOperator safe() {
		return LFltUnaryOperator::produceFloat;
	}

	/** Safe instance supplier. Returns supplier of safe() instance. */
	@Nonnull
	static LSupplier safeSupplier() {
		return () -> safe();
	}

	/** Safe wrapping. Either argument function is returned (if it is not null) or safe() instance. */
	@Nonnull
	static LFltUnaryOperator safe(final @Nullable LFltUnaryOperator other) {
		if (other == null) {
			return safe();
		} else {
			return other;
		}
	}

	/** Safe supplier. Either argument supplier is returned (if it is not null) or supplier of safe() instance. */
	@Nonnull
	static LSupplier safeSupplier(final @Nullable LSupplier supplier) {
		if (supplier == null) {
			return safeSupplier();
		} else {
			return supplier;
		}
	}

	// 

	// 

	/** Allows to manipulate the domain of the function. */
	@Nonnull
	default LFltUnaryOperator compose(@Nonnull final LFltUnaryOperator before) {
		Null.nonNullArg(before, "before");
		return v -> this.applyAsFlt(before.applyAsFlt(v));
	}

	public static LFltUnaryOperator composed(@Nonnull final LFltUnaryOperator before, LFltUnaryOperator after) {
		return after.compose(before);
	}

	/** Allows to manipulate the domain of the function. */
	@Nonnull
	default  LToFltFunction fltUnaryOpCompose(@Nonnull final LToFltFunction before) {
		Null.nonNullArg(before, "before");
		return v -> this.applyAsFlt(before.applyAsFlt(v));
	}

	public static  LToFltFunction composed(@Nonnull final LToFltFunction before, LFltUnaryOperator after) {
		return after.fltUnaryOpCompose(before);
	}

	// 

	// 

	/** Combines two functions together in a order. */
	@Nonnull
	default  LFltFunction then(@Nonnull LFltFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.apply(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToByteFunction thenToByte(@Nonnull LFltToByteFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsByte(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToSrtFunction thenToSrt(@Nonnull LFltToSrtFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsSrt(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToIntFunction thenToInt(@Nonnull LFltToIntFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsInt(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToLongFunction thenToLong(@Nonnull LFltToLongFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsLong(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltUnaryOperator thenToFlt(@Nonnull LFltUnaryOperator after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsFlt(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToDblFunction thenToDbl(@Nonnull LFltToDblFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsDbl(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltToCharFunction thenToChar(@Nonnull LFltToCharFunction after) {
		Null.nonNullArg(after, "after");
		return a -> after.applyAsChar(this.applyAsFlt(a));
	}

	/** Combines two functions together in a order. */
	@Nonnull
	default LFltPredicate thenToBool(@Nonnull LFltPredicate after) {
		Null.nonNullArg(after, "after");
		return a -> after.test(this.applyAsFlt(a));
	}

	// 

	/** Returns a function that always returns its input argument. */
	@Nonnull
	static LFltUnaryOperator identity() {
		return t -> t;
	}

	// 

	// 

	/** Does nothing (LFltUnaryOperator) Operator */
	public static float produceFloat(float a) {
		return Function4U.defaultFloat;
	}

	/**
	* For each element (or tuple) from arguments, calls the function and passes the result to consumer.
	* Thread safety, fail-fast, fail-safety of this method is not expected.
	*/
	default  void forEach(IndexedRead ia, C0 source, LFltConsumer consumer) {
		int size = ia.size(source);
		LOiToFltFunction oiFunc0 = (LOiToFltFunction) ia.getter();
		int i = 0;
		for (; i < size; i++) {
			float a = oiFunc0.applyAsFlt(source, i);
			consumer.accept(this.applyAsFlt(a));
		}
	}

	/**
	* For each element (or tuple) from arguments, calls the function and passes the result to consumer.
	* Thread safety, fail-fast, fail-safety of this method depends highly on the arguments.
	*/
	default  void iterate(SequentialRead sa, C0 source, LFltConsumer consumer) {
		Object iterator0 = ((LFunction) sa.adapter()).apply(source);
		LPredicate testFunc0 = (LPredicate) sa.tester();
		LToFltFunction nextFunc0 = (LToFltFunction) sa.supplier();
		while (testFunc0.test(iterator0)) {
			float a = nextFunc0.applyAsFlt(iterator0);
			consumer.accept(this.applyAsFlt(a));
		}
	}

}