Package io.vavr

Interface CheckedPredicate<T>

  • Type Parameters:
    T - the type of the input to the predicate
    Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
    @FunctionalInterface
public interface CheckedPredicate<T>
    A Predicate which may throw.

    • Method Detail

      • of

        static <T> CheckedPredicate<T> of​(CheckedPredicate<T> methodReference)
        Creates a CheckedPredicate. 
        
 final CheckedPredicate<Boolean> checkedPredicate = CheckedPredicate.of(Boolean::booleanValue);
 final Predicate<Boolean> predicate = checkedPredicate.unchecked();

 // = true
 predicate.test(Boolean.TRUE);

 // throws
 predicate.test(null);
        Type Parameters:
        T - type of values that are tested by the predicate
        Parameters:
        methodReference - (typically) a method reference, e.g. Type::method
        Returns:
        a new CheckedPredicate
        See Also:
        CheckedFunction1.of(CheckedFunction1)

      • test

        boolean test​(T t)
      throws java.lang.Throwable
        Evaluates this predicate on the given argument.
        Parameters:
        t - the input argument
        Returns:
        true if the input argument matches the predicate, otherwise false
        Throws:
        java.lang.Throwable - if an error occurs

      • negate

        default CheckedPredicate<T> negate()
        Negates this predicate.
        Returns:
        A new CheckedPredicate.

      • unchecked

        default java.util.function.Predicate<T> unchecked()
        Returns an unchecked Predicate that will sneaky throw if an exceptions occurs when testing a value.
        Returns:
        a new Predicate that throws a Throwable.