Module powerunit.exceptions

Package ch.powerunit.extensions.exceptions

Interface PredicateWithException<T,E extends Exception>

Type Parameters:

T - the type of the input to the predicate

E - the type of the potential exception of the function

All Superinterfaces:

ExceptionHandlerSupport<T,E>, PrimitiveReturnExceptionHandlerSupport<Predicate<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 PredicateWithException<T,E extends Exception>
extends PrimitiveReturnExceptionHandlerSupport<Predicate<T>>

Represents a predicate (boolean-valued function) of one argument and may throw an exception.

General contract

• boolean test(T t) throws E - The functional method.
• uncheck - Return a Predicate<T>
• lift - Return a Predicate<T>
• ignore - Return a Predicate<T>

See Also:

Predicate

Method Summary

Modifier and Type	Method	Description
default PredicateWithException<T,E>	and(PredicateWithException<? super T,? extends E> other)	Returns a composed predicate that represents a short-circuiting logical AND of this predicate and another.
static <T,E extends Exception> PredicateWithException<T,E>	failing(Supplier<E> exceptionBuilder)	Returns a predicate that always throw exception.
static <T,E extends Exception> Predicate<T>	ignored(PredicateWithException<T,E> predicate)	Converts a PredicateWithException to a lifted Predicate returning false in case of exception.
static <T,E extends Exception> Predicate<T>	lifted(PredicateWithException<T,E> predicate)	Converts a PredicateWithException to a lifted Predicate returning false in case of exception.
default PredicateWithException<T,E>	negate()	Returns a predicate that represents the logical negation of this predicate.
static <T,E extends Exception> PredicateWithException<T,E>	negate(PredicateWithException<T,E> predicate)	Negate a PredicateWithException.
default PredicateWithException<T,E>	or(PredicateWithException<? super T,? extends E> other)	Returns a composed predicate that represents a short-circuiting logical OR of this predicate and another.
boolean	test(T t)	Evaluates this predicate on the given argument.
static <T,E extends Exception> Predicate<T>	unchecked(PredicateWithException<T,E> predicate)	Converts a PredicateWithException to a Predicate that wraps exception to RuntimeException.
static <T,E extends Exception> Predicate<T>	unchecked(PredicateWithException<T,E> predicate, Function<Exception,RuntimeException> exceptionMapper)	Converts a PredicateWithException to a Predicate that wraps exception to RuntimeException by using the provided mapping function.
default Predicate<T>	uncheckOrIgnore(boolean uncheck)	Used internally to implements the ignore or uncheck operation.

Methods inherited from interface ch.powerunit.extensions.exceptions.ExceptionHandlerSupport

exceptionMapper, exceptionMapperFor

Methods inherited from interface ch.powerunit.extensions.exceptions.PrimitiveReturnExceptionHandlerSupport

handleException, ignore, lift, uncheck

Method Detail

test

boolean test(T t)
      throws E extends Exception

Evaluates this predicate on the given argument.

Parameters:

t - the input argument

Returns:

true if the input argument matches the predicate, otherwise false

Throws:

E - any exception

E extends Exception

See Also:

Predicate.test(Object)

uncheckOrIgnore

default Predicate<T> uncheckOrIgnore(boolean uncheck)

Description copied from interface: PrimitiveReturnExceptionHandlerSupport

Used internally to implements the ignore or uncheck operation.

Specified by:

uncheckOrIgnore in interface PrimitiveReturnExceptionHandlerSupport<T>

Parameters:

uncheck - create unchecked version of the function when true, else ignored version.

Returns:

the function

and

default PredicateWithException<T,E> and(PredicateWithException<? super T,? extends E> other)

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 false, then the other predicate is not evaluated.

Any exceptions thrown during evaluation of either predicate are relayed to the caller; if evaluation of this predicate throws an exception, the other predicate will not be evaluated.

Parameters:

other - a predicate that will be logically-ANDed with this predicate

Returns:

a composed predicate that represents the short-circuiting logical AND of this predicate and the other predicate

Throws:

NullPointerException - if other is null

See Also:

or(PredicateWithException), negate()

negate

default PredicateWithException<T,E> negate()

Returns a predicate that represents the logical negation of this predicate.

Returns:

a predicate that represents the logical negation of this predicate

See Also:

and(PredicateWithException), or(PredicateWithException)

negate

static <T,E extends Exception> PredicateWithException<T,E> negate(PredicateWithException<T,E> predicate)

Negate a PredicateWithException.

Type Parameters:

T - the type of the input to the predicate

E - the type of the potential exception

Parameters:

predicate - to be negate

Returns:

the negated predicate

Throws:

NullPointerException - if predicate is null

See Also:

negate()

or

default PredicateWithException<T,E> or(PredicateWithException<? super T,? extends E> other)

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 true, then the other predicate is not evaluated.

Any exceptions thrown during evaluation of either predicate are relayed to the caller; if evaluation of this predicate throws an exception, the other predicate will not be evaluated.

Parameters:

other - a predicate that will be logically-ORed with this predicate

Returns:

a composed predicate that represents the short-circuiting logical OR of this predicate and the other predicate

Throws:

NullPointerException - if other is null

See Also:

and(PredicateWithException), negate()

failing

static <T,E extends Exception> PredicateWithException<T,E> failing(Supplier<E> exceptionBuilder)

Returns a predicate that always throw exception.

Type Parameters:

T - the type of the input to the predicate

E - the type of the exception

Parameters:

exceptionBuilder - the supplier to create the exception

Returns:

a predicate that always throw exception

unchecked

static <T,E extends Exception> Predicate<T> unchecked(PredicateWithException<T,E> predicate)

Converts a PredicateWithException to a Predicate that wraps exception to RuntimeException.

Type Parameters:

T - the type of the input to the predicate

E - the type of the potential exception

Parameters:

predicate - to be unchecked

Returns:

the unchecked exception

Throws:

NullPointerException - if predicate is null

See Also:

PrimitiveReturnExceptionHandlerSupport.uncheck(), unchecked(PredicateWithException, Function)

unchecked

static <T,E extends Exception> Predicate<T> unchecked(PredicateWithException<T,E> predicate,
                                                      Function<Exception,RuntimeException> exceptionMapper)

Converts a PredicateWithException to a Predicate that wraps exception to RuntimeException by using the provided mapping function.

Type Parameters:

T - the type of the input object to the function

E - the type of the potential exception

Parameters:

predicate - the be unchecked

exceptionMapper - a function to convert the exception to the runtime exception.

Returns:

the unchecked exception

Throws:

NullPointerException - if predicate or exceptionMapper is null

See Also:

PrimitiveReturnExceptionHandlerSupport.uncheck(), unchecked(PredicateWithException)

lifted

static <T,E extends Exception> Predicate<T> lifted(PredicateWithException<T,E> predicate)

Converts a PredicateWithException to a lifted Predicate returning false in case of exception.

Type Parameters:

T - the type of the input to the predicate

E - the type of the potential exception

Parameters:

predicate - to be lifted

Returns:

the lifted predicate

Throws:

NullPointerException - if predicate is null

See Also:

PrimitiveReturnExceptionHandlerSupport.lift()

ignored

static <T,E extends Exception> Predicate<T> ignored(PredicateWithException<T,E> predicate)

Converts a PredicateWithException to a lifted Predicate returning false in case of exception.

Type Parameters:

T - the type of the input to the predicate

E - the type of the potential exception

Parameters:

predicate - to be lifted

Returns:

the lifted predicate

Throws:

NullPointerException - if predicate is null

See Also:

PrimitiveReturnExceptionHandlerSupport.ignore()