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 Summary

Modifier and Type	Method and Description
default CheckedPredicate<T>	negate() Negates this predicate.
static <T> CheckedPredicate<T>	of(CheckedPredicate<T> methodReference) Creates a CheckedPredicate.
boolean	test(T t) Evaluates this predicate on the given argument.
default Predicate<T>	unchecked() Returns an unchecked Predicate that will sneaky throw if an exceptions occurs when testing a value.

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 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:

Throwable - if an error occurs

negate

default CheckedPredicate<T> negate()

Negates this predicate.

Returns:

A new CheckedPredicate.

unchecked

default 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.