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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util.function;

import java.util.Objects;

/**
 * Represents a predicate (boolean-valued function) of one argument.
 *
 * <p>This is a <a href="package-summary.html">functional interface</a>
 * whose functional method is {@link #test(Object)}.
 *
 * @param <T> the type of the input to the predicate
 *
 * @since 1.8
 */
@FunctionalInterface
public interface Predicate<T> {

 /**
 * Evaluates this predicate on the given argument.
 *
 * @param t the input argument
 * @return {@code true} if the input argument matches the predicate,
 * otherwise {@code false}
 */
 boolean test(T t);

 /**
 * Returns a composed predicate that represents a short-circuiting logical
 * AND of this predicate and another. When evaluating the composed
 * predicate, if this predicate is {@code false}, then the {@code other}
 * predicate is not evaluated.
 *
 * <p>Any exceptions thrown during evaluation of either predicate are relayed
 * to the caller; if evaluation of this predicate throws an exception, the
 * {@code other} predicate will not be evaluated.
 *
 * @param other a predicate that will be logically-ANDed with this
 * predicate
 * @return a composed predicate that represents the short-circuiting logical
 * AND of this predicate and the {@code other} predicate
 * @throws NullPointerException if other is null
 */
 default Predicate<T> and(Predicate<? super T> other) {
 Objects.requireNonNull(other);
 return (t) -> test(t) && other.test(t);
 }

 /**
 * Returns a predicate that represents the logical negation of this
 * predicate.
 *
 * @return a predicate that represents the logical negation of this
 * predicate
 */
 default Predicate<T> negate() {
 return (t) -> !test(t);
 }

 /**
 * Returns a composed predicate that represents a short-circuiting logical
 * OR of this predicate and another. When evaluating the composed
 * predicate, if this predicate is {@code true}, then the {@code other}
 * predicate is not evaluated.
 *
 * <p>Any exceptions thrown during evaluation of either predicate are relayed
 * to the caller; if evaluation of this predicate throws an exception, the
 * {@code other} predicate will not be evaluated.
 *
 * @param other a predicate that will be logically-ORed with this
 * predicate
 * @return a composed predicate that represents the short-circuiting logical
 * OR of this predicate and the {@code other} predicate
 * @throws NullPointerException if other is null
 */
 default Predicate<T> or(Predicate<? super T> other) {
 Objects.requireNonNull(other);
 return (t) -> test(t) || other.test(t);
 }

 /**
 * Returns a predicate that tests if two arguments are equal according
 * to {@link Objects#equals(Object, Object)}.
 *
 * @param <T> the type of arguments to the predicate
 * @param targetRef the object reference with which to compare for equality,
 * which may be {@code null}
 * @return a predicate that tests if two arguments are equal according
 * to {@link Objects#equals(Object, Object)}
 */
 static <T> Predicate<T> isEqual(Object targetRef) {
 return (null == targetRef)
 ? Objects::isNull
 : object -> targetRef.equals(object);
 }

 /**
 * Returns a predicate that is the negation of the supplied predicate.
 * This is accomplished by returning result of the calling
 * {@code target.negate()}.
 *
 * @param <T> the type of arguments to the specified predicate
 * @param target predicate to negate
 *
 * @return a predicate that negates the results of the supplied
 * predicate
 *
 * @throws NullPointerException if target is null
 *
 * @since 11
 */
 @SuppressWarnings("unchecked")
 static <T> Predicate<T> not(Predicate<? super T> target) {
 Objects.requireNonNull(target);
 return (Predicate<T>)target.negate();
 }
}