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

Packages that use u.Optional

Package	Description
com.landawn.abacus
com.landawn.abacus.parser
com.landawn.abacus.util
com.landawn.abacus.util.stream

Uses of u.Optional in com.landawn.abacus

Methods in com.landawn.abacus that return u.Optional

Modifier and Type	Method and Description
u.Optional<DataSet>	PaginatedDataSet.firstPage() Returns the first page.
u.Optional<Object[]>	DataSet.firstRow()
<T> u.Optional<T>	DataSet.firstRow(Class<? extends T> rowClass)
<T> u.Optional<T>	DataSet.firstRow(Class<? extends T> rowClass, Collection<String> columnNames)
<T> u.Optional<T>	DataSet.firstRow(IntFunction<? extends T> rowSupplier)
<T> u.Optional<T>	DataSet.firstRow(IntFunction<? extends T> rowSupplier, Collection<String> columnNames)
u.Optional<DataSet>	PaginatedDataSet.lastPage() Returns the last page.
u.Optional<Object[]>	DataSet.lastRow()
<T> u.Optional<T>	DataSet.lastRow(Class<? extends T> rowClass)
<T> u.Optional<T>	DataSet.lastRow(Class<? extends T> rowClass, Collection<String> columnNames)
<T> u.Optional<T>	DataSet.lastRow(IntFunction<? extends T> rowSupplier)
<T> u.Optional<T>	DataSet.lastRow(IntFunction<? extends T> rowSupplier, Collection<String> columnNames)

Uses of u.Optional in com.landawn.abacus.parser

Fields in com.landawn.abacus.parser declared as u.Optional

Modifier and Type	Field and Description
u.Optional<String>	ParserUtil.PropInfo.columnName
u.Optional<String>	ParserUtil.EntityInfo.tableName

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

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

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

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

Modifier and Type	Method and Description
u.Optional<Pair<List<T>,Integer>>	Multiset.allMaxOccurrences() All max occurrences.
u.Optional<Pair<List<T>,Integer>>	Multiset.allMinOccurrences() All min occurrences.
<R> u.Optional<R>	ExceptionalStream.applyIfNotEmpty(Throwables.Function<? super ExceptionalStream<T,E>,R,? extends E> func)
<R,E extends Exception> u.Optional<R>	Multiset.applyIfNotEmpty(Throwables.Function<? super Multiset<T>,R,E> func) Apply if not empty.
u.Optional<Boolean>	u.OptionalBoolean.boxed()
u.Optional<Character>	u.OptionalChar.boxed()
u.Optional<Byte>	u.OptionalByte.boxed()
u.Optional<Short>	u.OptionalShort.boxed()
u.Optional<Integer>	u.OptionalInt.boxed()
u.Optional<Long>	u.OptionalLong.boxed()
u.Optional<Float>	u.OptionalFloat.boxed()
u.Optional<Double>	u.OptionalDouble.boxed()
static u.Optional<BigDecimal>	Numbers.createBigDecimal(String str) Convert a String to a BigDecimal.
static u.Optional<BigInteger>	Numbers.createBigInteger(String str) Convert a String to a BigInteger; since 3.2 it handles hex (0x or #) and octal (0) notations.
static u.Optional<Number>	Numbers.createNumber(String str) Turns a string value into a java.lang.Number.
u.Optional<T>	ExceptionalStream.elementAt(long position)
static <T> u.Optional<T>	u.Optional.empty()
<E extends Exception> u.Optional<Pair<L,R>>	Pair.filter(Throwables.BiPredicate<? super L,? super R,E> predicate)
<E extends Exception> u.Optional<Tuple.Tuple2<T1,T2>>	Tuple.Tuple2.filter(Throwables.BiPredicate<? super T1,? super T2,E> predicate)
<E extends Exception> u.Optional<Pair<L,R>>	Pair.filter(Throwables.Predicate<? super Pair<L,R>,E> predicate)
<E extends Exception> u.Optional<T>	u.Optional.filter(Throwables.Predicate<? super T,E> predicate)
<E extends Exception> u.Optional<TP>	Tuple.filter(Throwables.Predicate<? super TP,E> predicate)
<E extends Exception> u.Optional<Triple<L,M,R>>	Triple.filter(Throwables.Predicate<? super Triple<L,M,R>,E> predicate)
<E extends Exception> u.Optional<Triple<L,M,R>>	Triple.filter(Throwables.TriPredicate<? super L,? super M,? super R,E> predicate)
<E extends Exception> u.Optional<Tuple.Tuple3<T1,T2,T3>>	Tuple.Tuple3.filter(Throwables.TriPredicate<? super T1,? super T2,? super T3,E> predicate)
<E extends Exception> u.Optional<T>	u.Nullable.filterIfNotNull(Throwables.Predicate<? super T,E> predicate) Filter if not null.
u.Optional<T>	ExceptionalStream.findAny(Throwables.Predicate<? super T,E> predicate)
u.Optional<T>	ExceptionalStream.findFirst(Throwables.Predicate<? super T,E> predicate)
u.Optional<T>	ExceptionalStream.findLast(Throwables.Predicate<? super T,E> predicate) Consider using: stream.reversed().findFirst(predicate) for better performance if possible.
u.Optional<T>	ExceptionalStream.first()
<U,E extends Exception> u.Optional<U>	u.Optional.flatMap(Throwables.Function<? super T,u.Optional<U>,E> mapper)
<E extends Exception> u.Optional<T>	u.Optional.ifPresent(Throwables.Consumer<? super T,E> action)
<E extends Exception,E2 extends Exception> u.Optional<T>	u.Optional.ifPresentOrElse(Throwables.Consumer<? super T,E> action, Throwables.Runnable<E2> emptyAction) If present or else.
u.Optional<Range<T>>	Range.intersection(Range<T> other) Calculate the intersection of this and an overlapping Range.
u.Optional<T>	ExceptionalStream.kthLargest(int k, Comparator<? super T> comparator)
u.Optional<T>	ExceptionalStream.last()
<T,E extends Exception> u.Optional<T>	u.OptionalBoolean.mapToNonNull(Throwables.BooleanFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalByte.mapToNonNull(Throwables.ByteFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalChar.mapToNonNull(Throwables.CharFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalDouble.mapToNonNull(Throwables.DoubleFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalFloat.mapToNonNull(Throwables.FloatFunction<T,E> mapper)
<U,E extends Exception> u.Optional<U>	u.Optional.mapToNonNull(Throwables.Function<? super T,? extends U,E> mapper)
<U,E extends Exception> u.Optional<U>	u.Nullable.mapToNonNull(Throwables.Function<? super T,? extends U,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalInt.mapToNonNull(Throwables.IntFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalLong.mapToNonNull(Throwables.LongFunction<T,E> mapper)
<T,E extends Exception> u.Optional<T>	u.OptionalShort.mapToNonNull(Throwables.ShortFunction<T,E> mapper)
<U,E extends Exception> u.Optional<U>	u.Nullable.mapToNonNullIfNotNull(Throwables.Function<? super T,? extends U,E> mapper) Map if not null.
u.Optional<T>	ExceptionalStream.max(Comparator<? super T> comparator)
u.Optional<T>	ExceptionalStream.maxBy(Function<? super T,? extends Comparable> keyMapper)
u.Optional<Pair<T,Integer>>	Multiset.maxOccurrences()
u.Optional<T>	ExceptionalStream.min(Comparator<? super T> comparator)
u.Optional<T>	ExceptionalStream.minBy(Function<? super T,? extends Comparable> keyMapper)
u.Optional<Pair<T,Integer>>	Multiset.minOccurrences()
static u.Optional<String>	u.Optional.of(String value)
static <T> u.Optional<T>	u.Optional.of(T value)
static u.Optional<String>	u.Optional.ofNullable(String value)
static <T> u.Optional<T>	u.Optional.ofNullable(T value)
u.Optional<T>	ExceptionalStream.onlyOne()
<E extends Exception> u.Optional<T>	u.Optional.or(Throwables.Supplier<u.Optional<? extends T>,E> supplier)
u.Optional<Map<Percentage,T>>	ExceptionalStream.percentiles(Comparator<? super T> comparator)
<E2 extends Exception> u.Optional<T>	ExceptionalStream.reduce(Throwables.BinaryOperator<T,? extends E2> accumulator)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, char delimiterOfInclusiveBeginIndex) Returns an empty Optional if N.isNullOrEmpty(str) || str.indexOf(delimiterOfInclusiveBeginIndex) < 0, otherwise an Optional with String value: str.substring(str.indexOf(delimiterOfInclusiveBeginIndex)) is returned.
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, char delimiterOfInclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, int inclusiveBeginIndex) Returns an empty Optional if inclusiveBeginIndex < 0, otherwise an Optional with String value: str.substring(inclusiveBeginIndex) is returned.
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, int inclusiveBeginIndex, char delimiterOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, int inclusiveBeginIndex, int exclusiveEndIndex) Returns an empty Optional if inclusiveBeginIndex < 0 || exclusiveEndIndex < 0 || inclusiveBeginIndex > exclusiveEndIndex, otherwise an Optional with String value: str.substring(exclusiveBeginIndex, exclusiveEndIndex) is returned.
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, int inclusiveBeginIndex, IntUnaryOperator funcOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, int inclusiveBeginIndex, String delimiterOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, IntUnaryOperator funcOfInclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, String delimiterOfInclusiveBeginIndex) Returns an empty Optional if N.isNullOrEmpty(str) || str.indexOf(delimiterOfInclusiveBeginIndex) < 0, otherwise an Optional with String value: str.substring(str.indexOf(delimiterOfInclusiveBeginIndex)) is returned.
static u.Optional<String>	StringUtil.MoreStringUtil.substring(String str, String delimiterOfInclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringAfter(String str, String delimiterOfExclusiveBeginIndex) Returns the substring after first delimiterOfExclusiveBeginIndex if it exists, otherwise return null String.
static u.Optional<String>	StringUtil.MoreStringUtil.substringAfterLast(String str, String delimiterOfExclusiveBeginIndex) Returns the substring after last delimiterOfExclusiveBeginIndex if it exists, otherwise return null String.
static u.Optional<String>	StringUtil.MoreStringUtil.substringBefore(String str, String delimiterOfExclusiveEndIndex) Returns the substring before first delimiterOfExclusiveBeginIndex if it exists, otherwise return null String.
static u.Optional<String>	StringUtil.MoreStringUtil.substringBeforeLast(String str, String delimiterOfExclusiveEndIndex) Returns the substring last first delimiterOfExclusiveBeginIndex if it exists, otherwise return null String.
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, char delimiterOfExclusiveBeginIndex, char delimiterOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, char delimiterOfExclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, int exclusiveBeginIndex, char delimiterOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, int exclusiveBeginIndex, int exclusiveEndIndex) Returns an empty Optional if exclusiveBeginIndex < 0 || exclusiveEndIndex < 0 || exclusiveBeginIndex >= exclusiveEndIndex, otherwise an Optional with String value: str.substring(exclusiveBeginIndex + 1, exclusiveEndIndex) is returned.
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, int exclusiveBeginIndex, IntUnaryOperator funcOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, int exclusiveBeginIndex, String delimiterOfExclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, IntUnaryOperator funcOfExclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, String delimiterOfExclusiveBeginIndex, int exclusiveEndIndex)
static u.Optional<String>	StringUtil.MoreStringUtil.substringBetween(String str, String delimiterOfExclusiveBeginIndex, String delimiterOfExclusiveEndIndex)
u.Optional<Pair<L,R>>	Pair.toOptional()
u.Optional<Triple<L,M,R>>	Triple.toOptional()
u.Optional<TP>	Tuple.toOptional()
u.Optional<T>	u.Nullable.toOptional()

Methods in com.landawn.abacus.util with parameters of type u.Optional

Modifier and Type	Method and Description
static <T> u.Nullable<T>	u.Nullable.from(u.Optional<T> optional)
static <T> ExceptionalStream<T,RuntimeException>	ExceptionalStream.Seq.of(u.Optional<T> op)
static <T,E extends Exception> ExceptionalStream<T,E>	ExceptionalStream.of(u.Optional<T> op)

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

Modifier and Type	Method and Description
<U,E extends Exception> u.Optional<U>	u.Optional.flatMap(Throwables.Function<? super T,u.Optional<U>,E> mapper)
<E extends Exception> u.Optional<T>	u.Optional.or(Throwables.Supplier<u.Optional<? extends T>,E> supplier)

Uses of u.Optional in com.landawn.abacus.util.stream

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

Modifier and Type	Method and Description
static <T> Collector<T,?,u.Optional<BigDecimal>>	Collectors.averagingBigDecimal(Function<? super T,BigDecimal> mapper)
static <T> Collector<T,?,u.Optional<BigDecimal>>	Collectors.averagingBigInteger(Function<? super T,BigInteger> mapper)
static <T> Collector<T,?,u.Optional<T>>	Collectors.first() Only works for sequential Stream.
static <T> Collector<T,?,u.Optional<T>>	Collectors.last() Only works for sequential Stream.
static <T extends Comparable<? super T>> Collector<T,?,u.Optional<T>>	Collectors.max()
static <T> Collector<T,?,u.Optional<T>>	Collectors.max(Comparator<? super T> comparator)
static <T extends Comparable,A,D> Collector<T,?,Pair<u.Optional<T>,D>>	Collectors.maxAlll(Collector<T,A,D> downstream)
static <T,A,D> Collector<T,?,Pair<u.Optional<T>,D>>	Collectors.maxAlll(Comparator<? super T> comparator, Collector<? super T,A,D> downstream)
static <T> Collector<T,?,u.Optional<T>>	Collectors.maxBy(Function<? super T,? extends Comparable> keyMapper)
static <T extends Comparable<? super T>> Collector<T,?,u.Optional<T>>	Collectors.min()
static <T> Collector<T,?,u.Optional<T>>	Collectors.min(Comparator<? super T> comparator)
static <T extends Comparable,A,D> Collector<T,?,Pair<u.Optional<T>,D>>	Collectors.minAlll(Collector<T,A,D> downstream)
static <T,A,D> Collector<T,?,Pair<u.Optional<T>,D>>	Collectors.minAlll(Comparator<? super T> comparator, Collector<? super T,A,D> downstream)
static <T> Collector<T,?,u.Optional<T>>	Collectors.minBy(Function<? super T,? extends Comparable> keyMapper)
static <T extends Comparable> Collector<T,?,u.Optional<Pair<T,T>>>	Collectors.minMax()
static <T> Collector<T,?,u.Optional<Pair<T,T>>>	Collectors.minMax(Comparator<? super T> comparator)
static <T,R> Collector<T,?,u.Optional<R>>	Collectors.minMax(Comparator<? super T> comparator, BiFunction<? super T,? super T,? extends R> finisher) It's copied from StreamEx: https://github.com/amaembo/streamex under Apache License v2 and may be modified.
static <T> Collector<T,?,u.Optional<Pair<T,T>>>	Collectors.minMaxBy(Function<? super T,? extends Comparable> keyMapper)
static <T,R> Collector<T,?,u.Optional<R>>	Collectors.minMaxBy(Function<? super T,? extends Comparable> keyMapper, BiFunction<? super T,? super T,? extends R> finisher)
static <T> Collector<T,?,u.Optional<T>>	Collectors.onlyOne() DuplicatedResultException is threw if there are more than one values are collected.
static <T> Collector<T,?,u.Optional<T>>	Collectors.onlyOne(Predicate<? super T> predicate) DuplicatedResultException is threw if there are more than one values are collected.
static <T> Collector<T,?,u.Optional<T>>	Collectors.reducing(BinaryOperator<T> op)
static <T,U> Collector<T,?,u.Optional<U>>	Collectors.reducing(Function<? super T,? extends U> mapper, BinaryOperator<U> op)

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

Modifier and Type	Method and Description
static <T,A,D,R> Collector<T,?,R>	Collectors.maxAlll(Comparator<? super T> comparator, Collector<? super T,A,D> downstream, Function<Pair<u.Optional<T>,D>,R> finisher)
static <T,A,D,R> Collector<T,?,R>	Collectors.minAlll(Comparator<? super T> comparator, Collector<? super T,A,D> downstream, Function<Pair<u.Optional<T>,D>,R> finisher)