io.ayte.utility.predicate.BinaryPredicate Maven / Gradle / Ivy

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package io.ayte.utility.predicate;

import java.util.function.BiPredicate;
import java.util.function.BooleanSupplier;

/**
 * {@link BiPredicate} extensions solely for support of
 * {@link #xor(BiPredicate)} operation.
 *
 * @param  First argument type.
 * @param  Second argument type.
 *
 * @since 0.1.0
 */
public interface BinaryPredicate extends BiPredicate {
    /**
     * @param other Other predicate.
     * @return Predicate that returns true only if one of predicates
     * (this one or provided one) returns true.
     *
     * @since 0.1.0
     */
    default BinaryPredicate xor(BiPredicate other) {
        return (alpha, beta) -> test(alpha, beta) != other.test(alpha, beta);
    }

    default UnaryPredicate captureAlpha(T1 alpha) {
        return beta -> test(alpha, beta);
    }

    default UnaryPredicate captureBeta(T2 beta) {
        return alpha -> test(alpha, beta);
    }

    default UnaryPredicate capture(T1 alpha) {
        return captureAlpha(alpha);
    }

    default BooleanSupplier capture(T1 alpha, T2 beta) {
        return () -> test(alpha, beta);
    }
}