Package org.n52.janmayen.function

Class Predicates

java.lang.Object

org.n52.janmayen.function.Predicates

public final class Predicates
extends Object

Utility functions for Predicate.

Method Summary

Modifier and Type	Method	Description
static <T> Predicate<T>	alwaysFalse()	Creates a predicate that is always false.
static <T> Predicate<T>	alwaysTrue()	Creates a predicate that is always true.
static <T> Predicate<T>	constant(boolean value)	Creates a predicate that returns a constant value.
static <T,U> Predicate<U>	curryFirst(BiPredicate<T,U> predicate, T t)	Curries the first parameter of the BiPredicate and creates a Predicate.
static <T,U> Predicate<T>	currySecond(BiPredicate<T,U> predicate, U u)	Curries the second parameter of the BiPredicate and creates a Predicate.
static <T,U extends T> Predicate<T>	instanceOf(Class<? extends U> clazz)	Creates a Predicate that checks if it's input is an instance of clazz.
static <T> Predicate<T>	not(Predicate<T> predicate)	Negates the predicate.
static <T> Predicate<T>	of(Predicate<T> predicate)	Creates a predicate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

not

public static <T> Predicate<T> not(Predicate<T> predicate)

Negates the predicate.

Type Parameters:

T - the type of the input to the predicate

Parameters:

predicate - the predicate to negate

Returns:

the negated predicate

of

public static <T> Predicate<T> of(Predicate<T> predicate)

Creates a predicate.

Type Parameters:

T - the type of the input to the predicate

Parameters:

predicate - the predicate

Returns:

the predicate

alwaysFalse

public static <T> Predicate<T> alwaysFalse()

Creates a predicate that is always false.

Type Parameters:

T - the type of the input to the predicate

Returns:

the predicate

alwaysTrue

public static <T> Predicate<T> alwaysTrue()

Creates a predicate that is always true.

Type Parameters:

T - the type of the input to the predicate

Returns:

the predicate

constant

public static <T> Predicate<T> constant(boolean value)

Creates a predicate that returns a constant value.

Type Parameters:

T - the type of the input to the predicate

Parameters:

value - the constant value

Returns:

the predicate

instanceOf

public static <T,U extends T> Predicate<T> instanceOf(@Nonnull
                                                            Class<? extends U> clazz)

Creates a Predicate that checks if it's input is an instance of clazz.

Type Parameters:

T - The input type.

U - The type of which the input has to be an instance of.

Parameters:

clazz - The class of which the input has to be an instance of.

Returns:

The predicate.

curryFirst

public static <T,U> Predicate<U> curryFirst(@Nonnull
                                                  BiPredicate<T,U> predicate,
                                                  T t)

Curries the first parameter of the BiPredicate and creates a Predicate.

Type Parameters:

T - the first parameter type

U - the second parameter type

Parameters:

predicate - the predicate

t - the curried parameter

Returns:

the curried predicate

currySecond

public static <T,U> Predicate<T> currySecond(@Nonnull
                                                   BiPredicate<T,U> predicate,
                                                   U u)

Curries the second parameter of the BiPredicate and creates a Predicate.

Type Parameters:

T - the first parameter type

U - the second parameter type

Parameters:

predicate - the predicate

u - the curried parameter

Returns:

the curried predicate