ratpack.func

Interface Predicate<T>

Type Parameters:

T -

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 Predicate<T>

A function that returns true or false for a value.

This type serves the same purpose as the JDK's Predicate, but allows throwing checked exceptions. It contains methods for bridging to and from the JDK type.

Method Summary

Modifier and Type	Method and Description
boolean	apply(T t) Tests the given value.
static <T> Predicate<T>	from(Predicate<T> predicate) Creates a predicate from a JDK predicate.
default Predicate<T>	toPredicate() Creates a JDK Predicate from this predicate.

Method Detail

apply

boolean apply(T t)
       throws Exception

Tests the given value.

Parameters:

t - the value to “test”

Returns:

true if the predicate applied, otherwise false

Throws:

Exception - any

toPredicate

default Predicate<T> toPredicate()

Creates a JDK Predicate from this predicate.

Any exceptions thrown by this action will be unchecked via ExceptionUtils.uncheck(Throwable) and rethrown.

Returns:

this function as a JDK style predicate.

from

static <T> Predicate<T> from(Predicate<T> predicate)

Creates a predicate from a JDK predicate.

Type Parameters:

T - the type of object this predicate tests

Parameters:

predicate - the JDK predicate

Returns:

the given JDK predicate as a predicate