Java tutorial
/* * Copyright (c) 2016 Gridtec. 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 at.gridtec.lambda4j.operator.binary; import at.gridtec.lambda4j.Lambda; import at.gridtec.lambda4j.consumer.BooleanConsumer; import at.gridtec.lambda4j.consumer.bi.BiBooleanConsumer; import at.gridtec.lambda4j.function.BooleanFunction; import at.gridtec.lambda4j.function.bi.BiBooleanFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToByteFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToCharFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToDoubleFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToFloatFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToIntFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToLongFunction; import at.gridtec.lambda4j.function.bi.conversion.BiBooleanToShortFunction; import at.gridtec.lambda4j.function.conversion.BooleanToByteFunction; import at.gridtec.lambda4j.function.conversion.BooleanToCharFunction; import at.gridtec.lambda4j.function.conversion.BooleanToDoubleFunction; import at.gridtec.lambda4j.function.conversion.BooleanToFloatFunction; import at.gridtec.lambda4j.function.conversion.BooleanToIntFunction; import at.gridtec.lambda4j.function.conversion.BooleanToLongFunction; import at.gridtec.lambda4j.function.conversion.BooleanToShortFunction; import at.gridtec.lambda4j.operator.unary.BooleanUnaryOperator; import at.gridtec.lambda4j.predicate.BytePredicate; import at.gridtec.lambda4j.predicate.CharPredicate; import at.gridtec.lambda4j.predicate.FloatPredicate; import at.gridtec.lambda4j.predicate.ShortPredicate; import at.gridtec.lambda4j.predicate.bi.BiBytePredicate; import at.gridtec.lambda4j.predicate.bi.BiCharPredicate; import at.gridtec.lambda4j.predicate.bi.BiDoublePredicate; import at.gridtec.lambda4j.predicate.bi.BiFloatPredicate; import at.gridtec.lambda4j.predicate.bi.BiIntPredicate; import at.gridtec.lambda4j.predicate.bi.BiLongPredicate; import at.gridtec.lambda4j.predicate.bi.BiPredicate2; import at.gridtec.lambda4j.predicate.bi.BiShortPredicate; import org.apache.commons.lang3.tuple.Pair; import javax.annotation.Nonnegative; import javax.annotation.Nonnull; import javax.annotation.Nullable; import java.util.Comparator; import java.util.Map; import java.util.Objects; import java.util.concurrent.ConcurrentHashMap; import java.util.function.BinaryOperator; import java.util.function.DoublePredicate; import java.util.function.IntPredicate; import java.util.function.LongPredicate; import java.util.function.Predicate; /** * Represents an operation that accepts two {@code boolean}-valued input arguments and produces a * {@code boolean}-valued result. * This is a primitive specialization of {@link BinaryOperator2}. * <p> * This is a {@link FunctionalInterface} whose functional method is {@link #applyAsBoolean(boolean, boolean)}. * * @see BinaryOperator2 */ @SuppressWarnings("unused") @FunctionalInterface public interface BooleanBinaryOperator extends Lambda { /** * Constructs a {@link BooleanBinaryOperator} based on a lambda expression or a method reference. Thereby the given * lambda expression or method reference is returned on an as-is basis to implicitly transform it to the desired * type. With this method, it is possible to ensure that correct type is used from lambda expression or method * reference. * * @param expression A lambda expression or (typically) a method reference, e.g. {@code this::method} * @return A {@code BooleanBinaryOperator} from given lambda expression or method reference. * @implNote This implementation allows the given argument to be {@code null}, but only if {@code null} given, * {@code null} will be returned. * @see <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html#syntax">Lambda * Expression</a> * @see <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/methodreferences.html">Method Reference</a> */ static BooleanBinaryOperator of(@Nullable final BooleanBinaryOperator expression) { return expression; } /** * Calls the given {@link BooleanBinaryOperator} with the given arguments and returns its result. * * @param operator The operator to be called * @param value1 The first argument to the operator * @param value2 The second argument to the operator * @return The result from the given {@code BooleanBinaryOperator}. * @throws NullPointerException If given argument is {@code null} */ static boolean call(@Nonnull final BooleanBinaryOperator operator, boolean value1, boolean value2) { Objects.requireNonNull(operator); return operator.applyAsBoolean(value1, value2); } /** * Creates a {@link BooleanBinaryOperator} which uses the {@code first} parameter of this one as argument for the * given {@link BooleanUnaryOperator}. * * @param operator The operator which accepts the {@code first} parameter of this one * @return Creates a {@code BooleanBinaryOperator} which uses the {@code first} parameter of this one as argument * for the given {@code BooleanUnaryOperator}. * @throws NullPointerException If given argument is {@code null} */ @Nonnull static BooleanBinaryOperator onlyFirst(@Nonnull final BooleanUnaryOperator operator) { Objects.requireNonNull(operator); return (value1, value2) -> operator.applyAsBoolean(value1); } /** * Creates a {@link BooleanBinaryOperator} which uses the {@code second} parameter of this one as argument for the * given {@link BooleanUnaryOperator}. * * @param operator The operator which accepts the {@code second} parameter of this one * @return Creates a {@code BooleanBinaryOperator} which uses the {@code second} parameter of this one as argument * for the given {@code BooleanUnaryOperator}. * @throws NullPointerException If given argument is {@code null} */ @Nonnull static BooleanBinaryOperator onlySecond(@Nonnull final BooleanUnaryOperator operator) { Objects.requireNonNull(operator); return (value1, value2) -> operator.applyAsBoolean(value2); } /** * Creates a {@link BooleanBinaryOperator} which always returns a given value. * * @param ret The return value for the constant * @return A {@code BooleanBinaryOperator} which always returns a given value. */ @Nonnull static BooleanBinaryOperator constant(boolean ret) { return (value1, value2) -> ret; } /** * Returns a {@link BooleanBinaryOperator} which returns the lesser of two elements according to the specified * {@code Comparator}. * * @param comparator A {@code Comparator} for comparing the two values * @return A {@code BooleanBinaryOperator} which returns the lesser of its operands, according to the supplied * {@code Comparator}. * @throws NullPointerException If given argument is {@code null} * @see BinaryOperator#minBy(Comparator) */ @Nonnull static BooleanBinaryOperator minBy(@Nonnull final Comparator<Boolean> comparator) { Objects.requireNonNull(comparator); return (value1, value2) -> comparator.compare(value1, value2) <= 0 ? value1 : value2; } /** * Returns a {@link BooleanBinaryOperator} which returns the greater of two elements according to the specified * {@code Comparator}. * * @param comparator A {@code Comparator} for comparing the two values * @return A {@code BooleanBinaryOperator} which returns the greater of its operands, according to the supplied * {@code Comparator}. * @throws NullPointerException If given argument is {@code null} * @see BinaryOperator#maxBy(Comparator) */ @Nonnull static BooleanBinaryOperator maxBy(@Nonnull final Comparator<Boolean> comparator) { Objects.requireNonNull(comparator); return (value1, value2) -> comparator.compare(value1, value2) >= 0 ? value1 : value2; } /** * Applies this operator to the given arguments. * * @param value1 The first argument to the operator * @param value2 The second argument to the operator * @return The return value from the operator, which is its result. */ boolean applyAsBoolean(boolean value1, boolean value2); /** * Applies this operator partially to some arguments of this one, producing a {@link BooleanUnaryOperator} as * result. * * @param value1 The first argument to this operator used to partially apply this function * @return A {@code BooleanUnaryOperator} that represents this operator partially applied the some arguments. */ @Nonnull default BooleanUnaryOperator papplyAsBoolean(boolean value1) { return (value2) -> this.applyAsBoolean(value1, value2); } /** * Returns the number of arguments for this operator. * * @return The number of arguments for this operator. * @implSpec The default implementation always returns {@code 2}. */ @Nonnegative default int arity() { return 2; } /** * Returns a composed {@link BiPredicate2} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * * @param <A> The type of the argument to the first given predicate, and of composed predicate * @param <B> The type of the argument to the second given predicate, and of composed predicate * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiPredicate2} that first applies the {@code before} predicates to its input, and then * applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is able to handle every type. */ @Nonnull default <A, B> BiPredicate2<A, B> compose(@Nonnull final Predicate<? super A> before1, @Nonnull final Predicate<? super B> before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (a, b) -> applyAsBoolean(before1.test(a), before2.test(b)); } /** * Returns a composed {@link BooleanBinaryOperator} that first applies the {@code before} operators to its input, * and then applies this operator to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * execute an operation which accepts {@code boolean} input, before this primitive operator is executed. * * @param before1 The first operator to apply before this operator is applied * @param before2 The second operator to apply before this operator is applied * @return A composed {@code BooleanBinaryOperator} that first applies the {@code before} operators to its input, * and then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * boolean}. */ @Nonnull default BooleanBinaryOperator composeFromBoolean(@Nonnull final BooleanUnaryOperator before1, @Nonnull final BooleanUnaryOperator before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.applyAsBoolean(value1), before2.applyAsBoolean(value2)); } /** * Returns a composed {@link BiBytePredicate} that first applies the {@code before} predicates to * its input, and then applies this operator to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * This method is just convenience, to provide the ability to execute an operation which accepts {@code byte} input, * before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiBytePredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * byte}. */ @Nonnull default BiBytePredicate composeFromByte(@Nonnull final BytePredicate before1, @Nonnull final BytePredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiCharPredicate} that first applies the {@code before} predicates to * its input, and then applies this operator to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * This method is just convenience, to provide the ability to execute an operation which accepts {@code char} input, * before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiCharPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * char}. */ @Nonnull default BiCharPredicate composeFromChar(@Nonnull final CharPredicate before1, @Nonnull final CharPredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiDoublePredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. If evaluation of either operation throws an exception, it is relayed to * the caller of the composed operation. This method is just convenience, to provide the ability to execute an * operation which accepts {@code double} input, before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiDoublePredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * double}. */ @Nonnull default BiDoublePredicate composeFromDouble(@Nonnull final DoublePredicate before1, @Nonnull final DoublePredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiFloatPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. If evaluation of either operation throws an exception, it is relayed to * the caller of the composed operation. This method is just convenience, to provide the ability to execute an * operation which accepts {@code float} input, before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiFloatPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * float}. */ @Nonnull default BiFloatPredicate composeFromFloat(@Nonnull final FloatPredicate before1, @Nonnull final FloatPredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiIntPredicate} that first applies the {@code before} predicates to * its input, and then applies this operator to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * This method is just convenience, to provide the ability to execute an operation which accepts {@code int} input, * before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiIntPredicate} that first applies the {@code before} predicates to its input, and then * applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * int}. */ @Nonnull default BiIntPredicate composeFromInt(@Nonnull final IntPredicate before1, @Nonnull final IntPredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiLongPredicate} that first applies the {@code before} predicates to * its input, and then applies this operator to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * This method is just convenience, to provide the ability to execute an operation which accepts {@code long} input, * before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiLongPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * long}. */ @Nonnull default BiLongPredicate composeFromLong(@Nonnull final LongPredicate before1, @Nonnull final LongPredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiShortPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. If evaluation of either operation throws an exception, it is relayed to * the caller of the composed operation. This method is just convenience, to provide the ability to execute an * operation which accepts {@code short} input, before this primitive operator is executed. * * @param before1 The first predicate to apply before this operator is applied * @param before2 The second predicate to apply before this operator is applied * @return A composed {@code BiShortPredicate} that first applies the {@code before} predicates to its input, and * then applies this operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to handle primitive values. In this case this is {@code * short}. */ @Nonnull default BiShortPredicate composeFromShort(@Nonnull final ShortPredicate before1, @Nonnull final ShortPredicate before2) { Objects.requireNonNull(before1); Objects.requireNonNull(before2); return (value1, value2) -> applyAsBoolean(before1.test(value1), before2.test(value2)); } /** * Returns a composed {@link BiBooleanFunction} that first applies this operator to its input, and then applies the * {@code after} function to the result. * If evaluation of either operation throws an exception, it is relayed to the caller of the composed operation. * * @param <S> The type of return value from the {@code after} function, and of the composed function * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanFunction} that first applies this operator to its input, and then applies the * {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is able to return every type. */ @Nonnull default <S> BiBooleanFunction<S> andThen(@Nonnull final BooleanFunction<? extends S> after) { Objects.requireNonNull(after); return (value1, value2) -> after.apply(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BooleanBinaryOperator} that first applies this operator to its input, and then applies * the {@code after} operator to the result. If evaluation of either operation throws an exception, it is relayed to * the caller of the composed operation. This method is just convenience, to provide the ability to transform this * primitive operator to an operation returning {@code boolean}. * * @param after The operator to apply after this operator is applied * @return A composed {@code BooleanBinaryOperator} that first applies this operator to its input, and then applies * the {@code after} operator to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * boolean}. */ @Nonnull default BooleanBinaryOperator andThenToBoolean(@Nonnull final BooleanUnaryOperator after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsBoolean(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToByteFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code byte}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToByteFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * byte}. */ @Nonnull default BiBooleanToByteFunction andThenToByte(@Nonnull final BooleanToByteFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsByte(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToCharFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code char}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToCharFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * char}. */ @Nonnull default BiBooleanToCharFunction andThenToChar(@Nonnull final BooleanToCharFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsChar(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToDoubleFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code double}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToDoubleFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * double}. */ @Nonnull default BiBooleanToDoubleFunction andThenToDouble(@Nonnull final BooleanToDoubleFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsDouble(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToFloatFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code float}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToFloatFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * float}. */ @Nonnull default BiBooleanToFloatFunction andThenToFloat(@Nonnull final BooleanToFloatFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsFloat(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToIntFunction} that first applies this operator to its input, and then applies * the {@code after} function to the result. If evaluation of either operation throws an exception, it is relayed to * the caller of the composed operation. This method is just convenience, to provide the ability to transform this * primitive operator to an operation returning {@code int}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToIntFunction} that first applies this operator to its input, and then applies * the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * int}. */ @Nonnull default BiBooleanToIntFunction andThenToInt(@Nonnull final BooleanToIntFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsInt(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToLongFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code long}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToLongFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * long}. */ @Nonnull default BiBooleanToLongFunction andThenToLong(@Nonnull final BooleanToLongFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsLong(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanToShortFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. This method is just convenience, to provide the ability to * transform this primitive operator to an operation returning {@code short}. * * @param after The function to apply after this operator is applied * @return A composed {@code BiBooleanToShortFunction} that first applies this operator to its input, and then * applies the {@code after} function to the result. * @throws NullPointerException If given argument is {@code null} * @implSpec The input argument of this method is a able to return primitive values. In this case this is {@code * short}. */ @Nonnull default BiBooleanToShortFunction andThenToShort(@Nonnull final BooleanToShortFunction after) { Objects.requireNonNull(after); return (value1, value2) -> after.applyAsShort(applyAsBoolean(value1, value2)); } /** * Returns a composed {@link BiBooleanConsumer} that fist applies this operator to its input, and then consumes the * result using the given {@link BooleanConsumer}. If evaluation of either operation throws an exception, it is * relayed to the caller of the composed operation. * * @param consumer The operation which consumes the result from this operation * @return A composed {@code BiBooleanConsumer} that first applies this operator to its input, and then consumes the * result using the given {@code BooleanConsumer}. * @throws NullPointerException If given argument is {@code null} */ @Nonnull default BiBooleanConsumer consume(@Nonnull final BooleanConsumer consumer) { Objects.requireNonNull(consumer); return (value1, value2) -> consumer.accept(applyAsBoolean(value1, value2)); } /** * Returns a memoized (caching) version of this {@link BooleanBinaryOperator}. Whenever it is called, the mapping * between the input parameters and the return value is preserved in a cache, making subsequent calls returning the * memoized value instead of computing the return value again. * <p> * Unless the operator and therefore the used cache will be garbage-collected, it will keep all memoized values * forever. * * @return A memoized (caching) version of this {@code BooleanBinaryOperator}. * @implSpec This implementation does not allow the input parameters or return value to be {@code null} for the * resulting memoized operator, as the cache used internally does not permit {@code null} keys or values. * @implNote The returned memoized operator can be safely used concurrently from multiple threads which makes it * thread-safe. */ @Nonnull default BooleanBinaryOperator memoized() { if (isMemoized()) { return this; } else { final Map<Pair<Boolean, Boolean>, Boolean> cache = new ConcurrentHashMap<>(); final Object lock = new Object(); return (BooleanBinaryOperator & Memoized) (value1, value2) -> { final boolean returnValue; synchronized (lock) { returnValue = cache.computeIfAbsent(Pair.of(value1, value2), key -> applyAsBoolean(key.getLeft(), key.getRight())); } return returnValue; }; } } /** * Returns a composed {@link BinaryOperator2} which represents this {@link BooleanBinaryOperator}. Thereby the * primitive input argument for this operator is autoboxed. This method provides the possibility to use this {@code * BooleanBinaryOperator} with methods provided by the {@code JDK}. * * @return A composed {@code BinaryOperator2} which represents this {@code BooleanBinaryOperator}. */ @Nonnull default BinaryOperator2<Boolean> boxed() { return this::applyAsBoolean; } }