Uses of Class
com.google.common.base.Optional

Packages that use Optional

Package	Description
com.google.common.base	Basic utility libraries and interfaces.
com.google.common.collect	This package contains generic collection interfaces and implementations, and other utilities for working with collections.
com.google.common.graph	An API for representing graph (node and edge) data.
com.google.common.io	This package contains utility methods and classes for working with Java I/O; for example input streams, output streams, readers, writers, and files.
com.google.common.net	This package contains utility methods and classes for working with net addresses (numeric IP and domain names).
com.google.common.testing	This package contains testing utilities.
com.google.common.util.concurrent	Concurrency utilities.

Uses of Optional in com.google.common.base

Subclasses of Optional in com.google.common.base

Modifier and Type	Class	Description
(package private) class	Absent<T>	Implementation of an Optional not containing a reference.
(package private) class	Present<T>	Implementation of an Optional containing a reference.

Methods in com.google.common.base that return Optional

Modifier and Type	Method	Description
static <T> Optional<T>	Optional.absent()	Returns an Optional instance with no contained reference.
static <T> Optional<T>	Optional.fromJavaUtil(java.util.Optional<T> javaUtilOptional)	Returns the equivalent com.google.common.base.Optional value to the given java.util.Optional, or null if the argument is null.
static <T> Optional<T>	Optional.fromNullable(T nullableReference)	If nullableReference is non-null, returns an Optional instance containing that reference; otherwise returns absent().
(package private) static <T extends java.lang.Enum<T>> Optional<T>	Platform.getEnumIfPresent(java.lang.Class<T> enumClass, java.lang.String value)
static <T extends java.lang.Enum<T>> Optional<T>	Enums.getIfPresent(java.lang.Class<T> enumClass, java.lang.String value)	Returns an optional enum constant for the given type, using Enum.valueOf(java.lang.Class<T>, java.lang.String).
static <T> Optional<T>	Optional.of(T reference)	Returns an Optional instance containing the given non-null reference.
Optional<T>	Absent.or(Optional<? extends T> secondChoice)
abstract Optional<T>	Optional.or(Optional<? extends T> secondChoice)	Returns this Optional if it has a value present; secondChoice otherwise.
Optional<T>	Present.or(Optional<? extends T> secondChoice)
<V> Optional<V>	Absent.transform(Function<? super T,V> function)
abstract <V> Optional<V>	Optional.transform(Function<? super T,V> function)	If the instance is present, it is transformed with the given Function; otherwise, absent() is returned.
<V> Optional<V>	Present.transform(Function<? super T,V> function)
(package private) static <T> Optional<T>	Absent.withType()

Methods in com.google.common.base with parameters of type Optional

Modifier and Type	Method	Description
Optional<T>	Absent.or(Optional<? extends T> secondChoice)
abstract Optional<T>	Optional.or(Optional<? extends T> secondChoice)	Returns this Optional if it has a value present; secondChoice otherwise.
Optional<T>	Present.or(Optional<? extends T> secondChoice)
static <T> java.util.Optional<T>	Optional.toJavaUtil(Optional<T> googleOptional)	Returns the equivalent java.util.Optional value to the given com.google.common.base.Optional, or null if the argument is null.

Method parameters in com.google.common.base with type arguments of type Optional

Modifier and Type	Method	Description
static <T> java.lang.Iterable<T>	Optional.presentInstances(java.lang.Iterable<? extends Optional<? extends T>> optionals)	Returns the value of each present instance from the supplied optionals, in order, skipping over occurrences of absent().

Uses of Optional in com.google.common.collect

Fields in com.google.common.collect declared as Optional

Modifier and Type	Field	Description
private Optional<java.lang.Iterable<E>>	FluentIterable.iterableDelegate

Methods in com.google.common.collect that return Optional

Modifier and Type	Method	Description
Optional<E>	FluentIterable.first()	Returns an Optional containing the first element in this fluent iterable.
Optional<E>	FluentIterable.firstMatch(Predicate<? super E> predicate)	Returns an Optional containing the first element in this fluent iterable that satisfies the given predicate, if such an element exists.
Optional<E>	FluentIterable.last()	Returns an Optional containing the last element in this fluent iterable.
static <T> Optional<T>	Iterables.tryFind(java.lang.Iterable<T> iterable, Predicate<? super T> predicate)	Returns an Optional containing the first element in iterable that satisfies the given predicate, if such an element exists.
static <T> Optional<T>	Iterators.tryFind(java.util.Iterator<T> iterator, Predicate<? super T> predicate)	Returns an Optional containing the first element in iterator that satisfies the given predicate, if such an element exists.

Methods in com.google.common.collect with parameters of type Optional

Modifier and Type	Method	Description
static <T> java.util.stream.Stream<T>	Streams.stream(Optional<T> optional)	If a value is present in optional, returns a stream containing only that element, otherwise returns an empty stream.

Uses of Optional in com.google.common.graph

Fields in com.google.common.graph declared as Optional

Modifier and Type	Field	Description
(package private) Optional<java.lang.Integer>	NetworkBuilder.expectedEdgeCount
(package private) Optional<java.lang.Integer>	AbstractGraphBuilder.expectedNodeCount

Uses of Optional in com.google.common.io

Methods in com.google.common.io that return Optional

Modifier and Type	Method	Description
Optional<java.lang.Long>	CharSource.CharSequenceCharSource.lengthIfKnown()
Optional<java.lang.Long>	CharSource.ConcatenatedCharSource.lengthIfKnown()
Optional<java.lang.Long>	CharSource.lengthIfKnown()	Returns the size of this source in chars, if the size can be easily determined without actually opening the data stream.
Optional<java.lang.Long>	ByteSource.ByteArrayByteSource.sizeIfKnown()
Optional<java.lang.Long>	ByteSource.ConcatenatedByteSource.sizeIfKnown()
Optional<java.lang.Long>	ByteSource.sizeIfKnown()	Returns the size of this source in bytes, if the size can be easily determined without actually opening the data stream.
Optional<java.lang.Long>	ByteSource.SlicedByteSource.sizeIfKnown()
Optional<java.lang.Long>	Files.FileByteSource.sizeIfKnown()
Optional<java.lang.Long>	MoreFiles.PathByteSource.sizeIfKnown()

Uses of Optional in com.google.common.net

Fields in com.google.common.net declared as Optional

Modifier and Type	Field	Description
private Optional<java.nio.charset.Charset>	MediaType.parsedCharset

Methods in com.google.common.net that return Optional

Modifier and Type	Method	Description
Optional<java.nio.charset.Charset>	MediaType.charset()	Returns an optional charset for the value of the charset parameter if it is specified.

Methods in com.google.common.net with parameters of type Optional

Modifier and Type	Method	Description
private int	InternetDomainName.findSuffixOfType(Optional<PublicSuffixType> desiredType)	Returns the index of the leftmost part of the suffix, or -1 if not found.
private static boolean	InternetDomainName.matchesType(Optional<PublicSuffixType> desiredType, Optional<PublicSuffixType> actualType)	If a desiredType is specified, returns true only if the actualType is identical.
private static boolean	InternetDomainName.matchesWildcardSuffixType(Optional<PublicSuffixType> desiredType, java.lang.String domain)	Does the domain name match one of the "wildcard" patterns (e.g.

Uses of Optional in com.google.common.testing

Methods in com.google.common.testing that return Optional

Modifier and Type	Method	Description
(package private) abstract Optional<java.lang.String>	AbstractPackageSanityTests.Chopper.chop(java.lang.String str)
private <T> Optional<T>	FreshValueGenerator.generateGoogleOptional()
private <T> Optional<T>	FreshValueGenerator.generateGoogleOptional(T value)

Uses of Optional in com.google.common.util.concurrent

Fields in com.google.common.util.concurrent with type parameters of type Optional

Modifier and Type	Field	Description
private java.util.List<Optional<V>>	CollectionFuture.CollectionFutureRunningState.values

Method parameters in com.google.common.util.concurrent with type arguments of type Optional

Modifier and Type	Method	Description
(package private) abstract C	CollectionFuture.CollectionFutureRunningState.combine(java.util.List<Optional<V>> values)
java.util.List<V>	CollectionFuture.ListFuture.ListFutureRunningState.combine(java.util.List<Optional<V>> values)