com.landawn.abacus.util

Class u.Holder<T>

java.lang.Object

com.landawn.abacus.util.u.Holder<T>

Type Parameters:

T -

All Implemented Interfaces:

Mutable

Enclosing class:

u

public static final class u.Holder<T>
extends Object

The Class Holder.

Constructor Summary

Constructors

Constructor and Description
Holder() Instantiates a new holder.

Method Summary

Modifier and Type	Method and Description
<E extends Exception> void	accept(Throwables.Consumer<? super T,E> action)
<E extends Exception> void	acceptIfNotNull(Throwables.Consumer<? super T,E> action) Deprecated. replaced by ifNotNull(com.landawn.abacus.util.Throwables.Consumer)
boolean	equals(Object obj)
<E extends Exception> u.Nullable<T>	filter(Throwables.Predicate<? super T,E> predicate)
<E extends Exception> u.Optional<T>	filterIfNotNull(Throwables.Predicate<? super T,E> predicate) Filter if not null.
T	getAndSet(T value) Gets the and set.
<E extends Exception> T	getAndUpdate(Throwables.UnaryOperator<T,E> updateFunction) Gets the and update.
T	getValue() Deprecated. replace by value().
int	hashCode()
<E extends Exception> void	ifNotNull(Throwables.Consumer<? super T,E> action) If not null.
<E extends Exception,E2 extends Exception> void	ifNotNullOrElse(Throwables.Consumer<? super T,E> action, Throwables.Runnable<E2> emptyAction) If not null or else.
boolean	isNotNull() Checks if is not null.
boolean	isNull() Checks if is null.
<U,E extends Exception> U	map(Throwables.Function<? super T,? extends U,E> mapper)
<U,E extends Exception> u.Nullable<U>	mapIfNotNull(Throwables.Function<? super T,? extends U,E> mapper) Map if not null.
<U,E extends Exception> u.Optional<U>	mapToNonNullIfNotNull(Throwables.Function<? super T,? extends U,E> mapper)
static <T> u.Holder<T>	of(T value)
<E extends Exception> T	orElseGetIfNull(Throwables.Supplier<? extends T,E> other) Or else get if null.
T	orElseIfNull(T other) Or else if null.
<X extends Throwable> T	orElseThrowIfNull(Supplier<? extends X> exceptionSupplier) Or else throw if null.
T	setAndGet(T value) Sets the and get.
<E extends Exception> boolean	setIf(T newValue, Throwables.BiPredicate<? super T,? super T,E> predicate) Deprecated.
<E extends Exception> boolean	setIf(T newValue, Throwables.Predicate<? super T,E> predicate) Set with the specified new value and returns true if predicate returns true.
void	setValue(T value) Sets the value.
u.Nullable<T>	toNullable() Returns a non-empty Nullable with the value.
u.Optional<T>	toOptional() Returns an Optional with the value if value is not null, otherwise an empty Optional is returned.
String	toString()
<E extends Exception> T	updateAndGet(Throwables.UnaryOperator<T,E> updateFunction) Update and get.
T	value()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Holder

public Holder()

Instantiates a new holder.

Method Detail

of

public static <T> u.Holder<T> of(T value)

Type Parameters:

T -

Parameters:

value -

Returns:

value

public T value()

Returns:

getValue

@Deprecated
public T getValue()

Deprecated. replace by value().

Gets the value.

Returns:

setValue

public void setValue(T value)

Sets the value.

Parameters:

value - the new value

getAndSet

public T getAndSet(T value)

Gets the and set.

Parameters:

value -

Returns:

setAndGet

public T setAndGet(T value)

Sets the and get.

Parameters:

value -

Returns:

getAndUpdate

public final <E extends Exception> T getAndUpdate(Throwables.UnaryOperator<T,E> updateFunction)
                                           throws E extends Exception

Gets the and update.

Type Parameters:

E -

Parameters:

updateFunction -

Returns:

Throws:

E - the e

E extends Exception

updateAndGet

public final <E extends Exception> T updateAndGet(Throwables.UnaryOperator<T,E> updateFunction)
                                           throws E extends Exception

Update and get.

Type Parameters:

E -

Parameters:

updateFunction -

Returns:

Throws:

E - the e

E extends Exception

setIf

public <E extends Exception> boolean setIf(T newValue,
                                           Throwables.Predicate<? super T,E> predicate)
                                    throws E extends Exception

Set with the specified new value and returns true if predicate returns true. Otherwise just return false without setting the value to new value.

Type Parameters:

E -

Parameters:

newValue -

predicate - - test the current value.

Returns:

Throws:

E - the e

E extends Exception

setIf

@Deprecated
public <E extends Exception> boolean setIf(T newValue,
                                                        Throwables.BiPredicate<? super T,? super T,E> predicate)
                                                 throws E extends Exception

Deprecated.

Set with the specified new value and returns true if predicate returns true. Otherwise just return false without setting the value to new value.

Type Parameters:

E -

Parameters:

newValue -

predicate - the first parameter is the current value, the second parameter is the new value.

Returns:

Throws:

E - the e

E extends Exception

isNull

public boolean isNull()

Checks if is null.

Returns:

true, if is null

isNotNull

public boolean isNotNull()

Checks if is not null.

Returns:

true, if is not null

ifNotNull

public <E extends Exception> void ifNotNull(Throwables.Consumer<? super T,E> action)
                                     throws E extends Exception

If not null.

Type Parameters:

E -

Parameters:

action -

Throws:

E - the e

E extends Exception

ifNotNullOrElse

public <E extends Exception,E2 extends Exception> void ifNotNullOrElse(Throwables.Consumer<? super T,E> action,
                                                                       Throwables.Runnable<E2> emptyAction)
                                                                throws E extends Exception,
                                                                       E2 extends Exception

If not null or else.

Type Parameters:

E -

E2 -

Parameters:

action -

emptyAction -

Throws:

E - the e

E2 - the e2

E extends Exception

accept

public <E extends Exception> void accept(Throwables.Consumer<? super T,E> action)
                                  throws E extends Exception

Type Parameters:

E -

Parameters:

action -

Throws:

E - the e

E extends Exception

acceptIfNotNull

@Deprecated
public <E extends Exception> void acceptIfNotNull(Throwables.Consumer<? super T,E> action)
                                                        throws E extends Exception

Deprecated. replaced by ifNotNull(com.landawn.abacus.util.Throwables.Consumer)

Accept if not null.

Type Parameters:

E -

Parameters:

action -

Throws:

E - the e

E extends Exception

map

public <U,E extends Exception> U map(Throwables.Function<? super T,? extends U,E> mapper)
                              throws E extends Exception

Type Parameters:

U -

E -

Parameters:

mapper -

Returns:

Throws:

E - the e

E extends Exception

mapIfNotNull

public <U,E extends Exception> u.Nullable<U> mapIfNotNull(Throwables.Function<? super T,? extends U,E> mapper)
                                                   throws E extends Exception

Map if not null.

Type Parameters:

U -

E -

Parameters:

mapper -

Returns:

Throws:

E - the e

E extends Exception

mapToNonNullIfNotNull

public <U,E extends Exception> u.Optional<U> mapToNonNullIfNotNull(Throwables.Function<? super T,? extends U,E> mapper)
                                                            throws E extends Exception

Throws:

E extends Exception

filter

public <E extends Exception> u.Nullable<T> filter(Throwables.Predicate<? super T,E> predicate)
                                           throws E extends Exception

Type Parameters:

E -

Parameters:

predicate -

Returns:

Throws:

E - the e

E extends Exception

filterIfNotNull

public <E extends Exception> u.Optional<T> filterIfNotNull(Throwables.Predicate<? super T,E> predicate)
                                                    throws E extends Exception

Filter if not null.

Type Parameters:

E -

Parameters:

predicate -

Returns:

Throws:

E - the e

E extends Exception

orElseIfNull

public T orElseIfNull(T other)

Or else if null.

Parameters:

other -

Returns:

orElseGetIfNull

public <E extends Exception> T orElseGetIfNull(Throwables.Supplier<? extends T,E> other)
                                        throws E extends Exception

Or else get if null.

Type Parameters:

E -

Parameters:

other -

Returns:

Throws:

E - the e

E extends Exception

orElseThrowIfNull

public <X extends Throwable> T orElseThrowIfNull(Supplier<? extends X> exceptionSupplier)
                                          throws X extends Throwable

Or else throw if null.

Type Parameters:

X -

Parameters:

exceptionSupplier -

Returns:

Throws:

X - the x

X extends Throwable

toNullable

public u.Nullable<T> toNullable()

Returns a non-empty Nullable with the value.

Returns:

toOptional

public u.Optional<T> toOptional()

Returns an Optional with the value if value is not null, otherwise an empty Optional is returned.

Returns:

hashCode

public int hashCode()

Overrides:

hashCode in class Object

Returns:

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

Parameters:

obj -

Returns:

toString

public String toString()

Overrides:

toString in class Object

Returns: