| 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.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).
|
| Modifier and Type | Method and Description |
|---|---|
static <T> Optional<T> |
Optional.absent()
Returns an
Optional instance with no contained reference. |
static <T> Optional<T> |
Optional.fromNullable(T nullableReference)
If
nullableReference is non-null, returns an Optional instance containing that
reference; otherwise returns absent(). |
static <T extends Enum<T>> |
Enums.getIfPresent(Class<T> enumClass,
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. |
abstract Optional<T> |
Optional.or(Optional<? extends T> secondChoice)
Returns this
Optional if it has a value present; secondChoice
otherwise. |
abstract <V> Optional<V> |
Optional.transform(Function<? super T,V> function)
|
| Modifier and Type | Method and Description |
|---|---|
abstract Optional<T> |
Optional.or(Optional<? extends T> secondChoice)
Returns this
Optional if it has a value present; secondChoice
otherwise. |
| Modifier and Type | Method and Description |
|---|---|
static <T> Iterable<T> |
Optional.presentInstances(Iterable<? extends Optional<? extends T>> optionals)
Returns the value of each present instance from the supplied
optionals, in order,
skipping over occurrences of absent(). |
| Modifier and Type | Method and 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. |
abstract Optional<T> |
BinaryTreeTraverser.leftChild(T root)
Returns the left child of the specified node, or
absent() if the specified
node has no left child. |
abstract Optional<T> |
BinaryTreeTraverser.rightChild(T root)
Returns the right child of the specified node, or
absent() if the specified
node has no right child. |
static <T> Optional<T> |
Iterables.tryFind(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(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. |
| Modifier and Type | Method and Description |
|---|---|
Optional<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<Long> |
ByteSource.sizeIfKnown()
Returns the size of this source in bytes, if the size can be easily determined without
actually opening the data stream.
|
| Modifier and Type | Method and Description |
|---|---|
Optional<Charset> |
MediaType.charset()
Returns an optional charset for the value of the charset parameter if it is specified.
|
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