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package java.util.function;

import java.util.Objects;

/**

 * Determines if the {@code double} input value matches some criteria. This is

 * the {@code double}-consuming primitive type specialization of

 * {@link Predicate}.

 *

 * @see Predicate

 * @since 1.8

 */

@FunctionalInterface

public interface DoublePredicate {

    /**

     * Returns {@code true} if the input value matches some criteria.

     *

     * @param value the value to be tested.

     * @return {@code true} if the input value matches some criteria, otherwise

     * {@code false}.

     */

    public boolean test(double value);

    /**

     * Returns a predicate which evaluates to {@code true} only if this

     * predicate and the provided predicate both evaluate to {@code true}. If

     * this predicate returns {@code false} then the remaining predicate is not

     * evaluated.

     *

     * @param p a predicate which will be logically-ANDed with this predicate.

     * @return a new predicate which returns {@code true} only if both

     * predicates return {@code true}.

     */

    public default DoublePredicate and(DoublePredicate p) {

        Objects.requireNonNull(p);

        return (value) -> test(value) && p.test(value);

    }

    /**

     * Returns a predicate which negates the result of this predicate.

     *

     * @return a new predicate who's result is always the opposite of this

     * predicate.

     */

    public default DoublePredicate negate() {

        return (value) -> !test(value);

    }

    /**

     * Returns a predicate which evaluates to {@code true} if either this

     * predicate or the provided predicate evaluates to {@code true}. If this

     * predicate returns {@code true} then the remaining predicate is not

     * evaluated.

     *

     * @param p a predicate which will be logically-ANDed with this predicate.

     * @return a new predicate which returns {@code true} if either predicate

     * returns {@code true}.

     */

    public default DoublePredicate or(DoublePredicate p) {

        Objects.requireNonNull(p);

        return (value) -> test(value) || p.test(value);

    }

    /**

     * Returns a predicate that evaluates to {@code true} if both or neither of

     * the component predicates evaluate to {@code true}.

     *

     * @param p a predicate which will be logically-XORed with this predicate.

     * @return a predicate that evaluates to {@code true} if all or none of the

     * component predicates evaluate to {@code true}.

     */

    public default DoublePredicate xor(DoublePredicate p) {

        Objects.requireNonNull(p);

        return (value) -> test(value) ^ p.test(value);

    }

}