Uses of Class
com.landawn.abacus.util.u.Nullable

Packages that use u.Nullable

Package	Description
com.landawn.abacus.util

Uses of u.Nullable in com.landawn.abacus.util

Fields in com.landawn.abacus.util declared as u.Nullable

Modifier and Type	Field	Description
static final u.Nullable<Boolean>	u.Nullable.FALSE	Presents Boolean.FALSE.
static final u.Nullable<Boolean>	u.Nullable.TRUE	Presents Boolean.TRUE.

Methods in com.landawn.abacus.util that return u.Nullable

Modifier and Type	Method	Description
static <T> u.Nullable<T>	N.castIfAssignable(Object val, Class<? extends T> targetType)	Returns an empty Nullable if val is null while targetType is primitive or can not be assigned to targetType.
static <T> u.Nullable<T>	u.Nullable.empty()
<E extends Exception> u.Nullable<T>	Holder.filter(Throwables.Predicate<? super T,E> predicate)
<E extends Exception> u.Nullable<T>	u.Nullable.filter(Throwables.Predicate<? super T,E> predicate)
static <T, E extends Exception, E2 extends Exception> u.Nullable<T>	Iterables.findFirstOrLast(Collection<? extends T> c, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first or last.
static <T, E extends Exception, E2 extends Exception> u.Nullable<T>	Iterables.findFirstOrLast(T[] a, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first or last.
u.Nullable<T>	ObjIterator.first()
<U, E extends Exception> u.Nullable<U>	u.Nullable.flatMap(Throwables.Function<? super T,u.Nullable<U>,E> mapper)
<U, E extends Exception> u.Nullable<U>	u.Nullable.flatMapIfNotNull(Throwables.Function<? super T,u.Nullable<U>,E> mapper)	Flat map if not null.
static <T> u.Nullable<T>	u.Nullable.from(u.Optional<T> optional)
static <T> u.Nullable<T>	u.Nullable.from(Optional<T> optional)
static <T> u.Nullable<T>	Iterators.get(Iterator<? extends T> iter, long index)
static <K, V> u.Nullable<V>	Maps.get(Map<K,? extends V> map, K key)
static <T> u.Nullable<T>	Maps.getByPathIfPresent(Map<?,?> map, String path)
static <T> u.Nullable<T>	Maps.getByPathIfPresent(Map<?,?> map, String path, Class<? extends T> targetType)
<E extends Exception> u.Nullable<T>	u.Nullable.ifNotNull(Throwables.Consumer<? super T,E> action)	If not null.
<E extends Exception, E2 extends Exception> u.Nullable<T>	u.Nullable.ifNotNullOrElse(Throwables.Consumer<? super T,E> action, Throwables.Runnable<E2> emptyAction)	If not null or else.
static <R, E extends Exception> u.Nullable<R>	N.ifOrEmpty(boolean b, Throwables.Supplier<R,E> supplier)	Returns a Nullable with value got from the specified supplier if b is true, otherwise returns an empty Nullable if b is false.
static <T, R, E extends Exception> u.Nullable<R>	N.ifOrEmpty(boolean b, T init, Throwables.Function<? super T,? extends R,E> func)	Returns a Nullable with value returned by func.apply(init) if b is true, otherwise returns an empty Nullable if b is false.
<E extends Exception> u.Nullable<T>	u.Nullable.ifPresent(Throwables.Consumer<? super T,E> action)
<E extends Exception, E2 extends Exception> u.Nullable<T>	u.Nullable.ifPresentOrElse(Throwables.Consumer<? super T,E> action, Throwables.Runnable<E2> emptyAction)	If present or else.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.kthLargest(Collection<? extends T> c, int k)	Returns Nullable.empty() if the specified Array/Collection is null or empty, or its length/size is less than k.
static <T> u.Nullable<T>	Iterables.kthLargest(Collection<? extends T> c, int k, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty, or its length/size is less than k.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.kthLargest(T[] a, int k)	Returns Nullable.empty() if the specified Array/Collection is null or empty, or its length/size is less than k.
static <T> u.Nullable<T>	Iterables.kthLargest(T[] a, int k, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty, or its length/size is less than k.
u.Nullable<T>	ObjIterator.last()
<U, E extends Exception> u.Nullable<U>	u.Nullable.map(Throwables.Function<? super T,? extends U,E> mapper)
<U, E extends Exception> u.Nullable<U>	u.Optional.map(Throwables.Function<? super T,? extends U,E> mapper)
<T, E extends Exception> u.Nullable<T>	Joiner.mapIfNotEmpty(Throwables.Function<? super String,T,E> mapper)	Call mapper only if at least one element/object/entry is appended.
<U, E extends Exception> u.Nullable<U>	Holder.mapIfNotNull(Throwables.Function<? super T,? extends U,E> mapper)	Map if not null.
<U, E extends Exception> u.Nullable<U>	u.Nullable.mapIfNotNull(Throwables.Function<? super T,? extends U,E> mapper)	Map if not null.
<T, E extends Exception> u.Nullable<T>	u.OptionalBoolean.mapToObj(Throwables.BooleanFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalByte.mapToObj(Throwables.ByteFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalChar.mapToObj(Throwables.CharFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalDouble.mapToObj(Throwables.DoubleFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalFloat.mapToObj(Throwables.FloatFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalInt.mapToObj(Throwables.IntFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalLong.mapToObj(Throwables.LongFunction<T,E> mapper)	Map to obj.
<T, E extends Exception> u.Nullable<T>	u.OptionalShort.mapToObj(Throwables.ShortFunction<T,E> mapper)	Map to obj.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.max(Iterable<? extends T> c)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.max(Iterable<? extends T> c, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.max(Iterator<? extends T> iter)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.max(Iterator<? extends T> iter, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.max(T[] a)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.max(T[] a, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.maxBy(Iterable<? extends T> c, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.maxBy(Iterator<? extends T> iter, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.maxBy(T[] a, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.median(Collection<? extends T> c)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.median(Collection<? extends T> c, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.median(T[] a)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.median(T[] a, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.medianBy(Collection<? extends T> c, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.medianBy(T[] a, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.min(Iterable<? extends T> c)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.min(Iterable<? extends T> c, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.min(Iterator<? extends T> iter)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.min(Iterator<? extends T> iter, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T extends Comparable<? super T>> u.Nullable<T>	Iterables.min(T[] a)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.min(T[] a, Comparator<? super T> cmp)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.minBy(Iterable<? extends T> c, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.minBy(Iterator<? extends T> iter, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static <T> u.Nullable<T>	Iterables.minBy(T[] a, Function<? super T,? extends Comparable> keyMapper)	Returns Nullable.empty() if the specified Array/Collection is null or empty.
static u.Nullable<String>	u.Nullable.of(String value)
static <T> u.Nullable<T>	u.Nullable.of(T value)
<E extends Exception> u.Nullable<T>	u.Nullable.or(Throwables.Supplier<u.Nullable<? extends T>,E> supplier)
<E extends Exception> u.Nullable<T>	u.Nullable.orIfNull(Throwables.Supplier<u.Nullable<? extends T>,E> supplier)	Or if null.
u.Nullable<T>	Holder.toNullable()	Returns a non-empty Nullable with the value.
static <R> u.Nullable<R>	N.tryOrEmptyIfExceptionOccurred(Callable<R> cmd)	Returns a Nullable with the value returned by action or an empty Nullable if exception happens.
static <T, R> u.Nullable<R>	N.tryOrEmptyIfExceptionOccurred(T init, Throwables.Function<? super T,? extends R,? extends Exception> func)	Returns a Nullable with the value returned by func.apply(init) or an empty Nullable if exception happens.

Methods in com.landawn.abacus.util that return types with arguments of type u.Nullable

Modifier and Type	Method	Description
static <K, V> Map<K,Pair<V,u.Nullable<V>>>	Maps.difference(Map<K,V> map, Map<K,V> map2)
static <T, E extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(Collection<? extends T> c, Throwables.Predicate<? super T,E> predicate)	Find first and last.
static <T, E extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(Collection<? extends T> c, Throwables.Predicate<? super T,E> predicate)	Find first and last.
static <T, E extends Exception, E2 extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(Collection<? extends T> c, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first and last.
static <T, E extends Exception, E2 extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(Collection<? extends T> c, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first and last.
static <T, E extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(T[] a, Throwables.Predicate<? super T,E> predicate)	Find first and last.
static <T, E extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(T[] a, Throwables.Predicate<? super T,E> predicate)	Find first and last.
static <T, E extends Exception, E2 extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(T[] a, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first and last.
static <T, E extends Exception, E2 extends Exception> Pair<u.Nullable<T>,u.Nullable<T>>	Iterables.findFirstAndLast(T[] a, Throwables.Predicate<? super T,E> predicateForFirst, Throwables.Predicate<? super T,E2> predicateForLast)	Find first and last.
static <T extends Comparable<? super T>> Pair<T,u.Nullable<T>>	Median.of(Collection<? extends T> c)
static <T> Pair<T,u.Nullable<T>>	Median.of(Collection<? extends T> c, Comparator<? super T> cmp)
static <T extends Comparable<? super T>> Pair<T,u.Nullable<T>>	Median.of(T[] a)	Returns a Pair with left is the value at the index of (a.length - 1) / 2 when the array is sorted, and the right is the value at the index of a.length / 2 if the length of array is even.
static <T extends Comparable<? super T>> Pair<T,u.Nullable<T>>	Median.of(T[] a, int fromIndex, int toIndex)	Returns a Pair with left is the value at the index of (a.length - 1) / 2 when the array is sorted, and the right is the value at the index of a.length / 2 if the length of array is even.
static <T> Pair<T,u.Nullable<T>>	Median.of(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp)	Returns a Pair with left is the value at the index of (a.length - 1) / 2 when the array is sorted, and the right is the value at the index of a.length / 2 if the length of array is even.
static <T> Pair<T,u.Nullable<T>>	Median.of(T[] a, Comparator<? super T> cmp)	Returns a Pair with left is the value at the index of (a.length - 1) / 2 when the array is sorted, and the right is the value at the index of a.length / 2 if the length of array is even.
static <K, V> Map<K,Pair<u.Nullable<V>,u.Nullable<V>>>	Maps.symmetricDifference(Map<K,V> map, Map<K,V> map2)
static <K, V> Map<K,Pair<u.Nullable<V>,u.Nullable<V>>>	Maps.symmetricDifference(Map<K,V> map, Map<K,V> map2)

Method parameters in com.landawn.abacus.util with type arguments of type u.Nullable

Modifier and Type	Method	Description
<U, E extends Exception> u.Nullable<U>	u.Nullable.flatMap(Throwables.Function<? super T,u.Nullable<U>,E> mapper)
<U, E extends Exception> u.Nullable<U>	u.Nullable.flatMapIfNotNull(Throwables.Function<? super T,u.Nullable<U>,E> mapper)	Flat map if not null.
<E extends Exception> u.Nullable<T>	u.Nullable.or(Throwables.Supplier<u.Nullable<? extends T>,E> supplier)
<E extends Exception> u.Nullable<T>	u.Nullable.orIfNull(Throwables.Supplier<u.Nullable<? extends T>,E> supplier)	Or if null.