Uses of Interface
com.google.common.base.Function

Packages that use Function

Package	Description
com.google.common.base	Basic utility libraries and interfaces.
com.google.common.cache	This package contains caching utilities.
com.google.common.collect	This package contains generic collection interfaces and implementations, and other utilities for working with collections.
com.google.common.escape	Interfaces, utilities, and simple implementations of escapers and encoders.
com.google.common.util.concurrent	Concurrency utilities.

Uses of Function in com.google.common.base

Classes in com.google.common.base that implement Function

Modifier and Type	Class and Description
class	Converter<A,B> A function from A to B with an associated reverse function from B to A; used for converting back and forth between different representations of the same information.

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

Modifier and Type	Method and Description
static <A,B,C> Function<A,C>	Functions.compose(Function<B,C> g, Function<A,? extends B> f) Returns the composition of two functions.
static <E> Function<Object,E>	Functions.constant(E value) Returns a function that ignores its input and always returns value.
static <K,V> Function<K,V>	Functions.forMap(Map<K,? extends V> map, V defaultValue) Returns a function which performs a map lookup with a default value.
static <K,V> Function<K,V>	Functions.forMap(Map<K,V> map) Returns a function which performs a map lookup.
static <T> Function<T,Boolean>	Functions.forPredicate(Predicate<T> predicate) Creates a function that returns the same boolean output as the given predicate for all inputs.
static <T> Function<Object,T>	Functions.forSupplier(Supplier<T> supplier) Returns a function that ignores its input and returns the result of supplier.get().
static <E> Function<E,E>	Functions.identity() Returns the identity function.
static <T> Function<Supplier<T>,T>	Suppliers.supplierFunction() Returns a function that accepts a supplier and returns the result of invoking Supplier.get() on that supplier.
static Function<Object,String>	Functions.toStringFunction() A function equivalent to the method reference Object::toString, for users not yet using Java 8.

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

Modifier and Type	Method and Description
static <F,T> Supplier<T>	Suppliers.compose(Function<? super F,T> function, Supplier<F> supplier) Returns a new supplier which is the composition of the provided function and supplier.
static <A,B,C> Function<A,C>	Functions.compose(Function<B,C> g, Function<A,? extends B> f) Returns the composition of two functions.
static <A,B,C> Function<A,C>	Functions.compose(Function<B,C> g, Function<A,? extends B> f) Returns the composition of two functions.
static <A,B> Predicate<A>	Predicates.compose(Predicate<B> predicate, Function<A,? extends B> function) Returns the composition of a function and a predicate.
static <A,B> Converter<A,B>	Converter.from(Function<? super A,? extends B> forwardFunction, Function<? super B,? extends A> backwardFunction) Returns a converter based on separate forward and backward functions.
static <A,B> Converter<A,B>	Converter.from(Function<? super A,? extends B> forwardFunction, Function<? super B,? extends A> backwardFunction) Returns a converter based on separate forward and backward functions.
<F> Equivalence<F>	Equivalence.onResultOf(Function<F,? extends T> function) Returns a new equivalence relation for F which evaluates equivalence by first applying function to the argument, then evaluating using this.
abstract <V> Optional<V>	Optional.transform(Function<? super T,V> function) If the instance is present, it is transformed with the given Function; otherwise, Optional.absent() is returned.

Uses of Function in com.google.common.cache

Subinterfaces of Function in com.google.common.cache

Modifier and Type	Interface and Description
interface	LoadingCache<K,V> A semi-persistent mapping from keys to values.

Classes in com.google.common.cache that implement Function

Modifier and Type	Class and Description
class	AbstractLoadingCache<K,V> This class provides a skeletal implementation of the Cache interface to minimize the effort required to implement this interface.
class	ForwardingLoadingCache<K,V> A cache which forwards all its method calls to another cache.
static class	ForwardingLoadingCache.SimpleForwardingLoadingCache<K,V> A simplified version of ForwardingLoadingCache where subclasses can pass in an already constructed LoadingCache as the delegate.

Methods in com.google.common.cache with parameters of type Function

Modifier and Type	Method and Description
static <K,V> CacheLoader<K,V>	CacheLoader.from(Function<K,V> function) Returns a cache loader that uses function to load keys, and without supporting either reloading or bulk loading.

Uses of Function in com.google.common.collect

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

Modifier and Type	Method and Description
static <E> Function<E,E>	Interners.asFunction(Interner<E> interner) Returns a function that delegates to the Interner.intern(E) method of the given interner.

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

Modifier and Type	Method and Description
static <K,V> NavigableMap<K,V>	Maps.asMap(NavigableSet<K> set, Function<? super K,V> function) Returns a view of the navigable set as a map, mapping keys from the set according to the specified function.
static <K,V> Map<K,V>	Maps.asMap(Set<K> set, Function<? super K,V> function) Returns a live Map view whose keys are the contents of set and whose values are computed on demand using function.
static <K,V> SortedMap<K,V>	Maps.asMap(SortedSet<K> set, Function<? super K,V> function) Returns a view of the sorted set as a map, mapping keys from the set according to the specified function.
<K> ImmutableListMultimap<K,E>	FluentIterable.index(Function<? super E,K> keyFunction) Creates an index ImmutableListMultimap that contains the results of applying a specified function to each item in this FluentIterable of values.
static <K,V> ImmutableListMultimap<K,V>	Multimaps.index(Iterable<V> values, Function<? super V,K> keyFunction) Creates an index ImmutableListMultimap that contains the results of applying a specified function to each item in an Iterable of values.
static <K,V> ImmutableListMultimap<K,V>	Multimaps.index(Iterator<V> values, Function<? super V,K> keyFunction) Creates an index ImmutableListMultimap that contains the results of applying a specified function to each item in an Iterator of values.
<F> Ordering<F>	Ordering.onResultOf(Function<F,? extends T> function) Returns a new ordering on F which orders elements by first applying a function to them, then comparing those results using this.
<V> ImmutableMap<E,V>	FluentIterable.toMap(Function<? super E,V> valueFunction) Returns an immutable map whose keys are the distinct elements of this FluentIterable and whose value for each key was computed by valueFunction.
static <K,V> ImmutableMap<K,V>	Maps.toMap(Iterable<K> keys, Function<? super K,V> valueFunction) Returns an immutable map whose keys are the distinct elements of keys and whose value for each key was computed by valueFunction.
static <K,V> ImmutableMap<K,V>	Maps.toMap(Iterator<K> keys, Function<? super K,V> valueFunction) Returns an immutable map whose keys are the distinct elements of keys and whose value for each key was computed by valueFunction.
static <F,T> Collection<T>	Collections2.transform(Collection<F> fromCollection, Function<? super F,T> function) Returns a collection that applies function to each element of fromCollection.
<T> FluentIterable<T>	FluentIterable.transform(Function<? super E,T> function) Returns a fluent iterable that applies function to each element of this fluent iterable.
static <F,T> Iterable<T>	Iterables.transform(Iterable<F> fromIterable, Function<? super F,? extends T> function) Returns a view containing the result of applying function to each element of fromIterable.
static <F,T> Iterator<T>	Iterators.transform(Iterator<F> fromIterator, Function<? super F,? extends T> function) Returns a view containing the result of applying function to each element of fromIterator.
static <F,T> List<T>	Lists.transform(List<F> fromList, Function<? super F,? extends T> function) Returns a list that applies function to each element of fromList.
<T> FluentIterable<T>	FluentIterable.transformAndConcat(Function<? super E,? extends Iterable<? extends T>> function) Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results.
static <K,V1,V2> ListMultimap<K,V2>	Multimaps.transformValues(ListMultimap<K,V1> fromMultimap, Function<? super V1,V2> function) Returns a view of a ListMultimap where each value is transformed by a function.
static <K,V1,V2> Map<K,V2>	Maps.transformValues(Map<K,V1> fromMap, Function<? super V1,V2> function) Returns a view of a map where each value is transformed by a function.
static <K,V1,V2> Multimap<K,V2>	Multimaps.transformValues(Multimap<K,V1> fromMultimap, Function<? super V1,V2> function) Returns a view of a multimap where each value is transformed by a function.
static <K,V1,V2> NavigableMap<K,V2>	Maps.transformValues(NavigableMap<K,V1> fromMap, Function<? super V1,V2> function) Returns a view of a navigable map where each value is transformed by a function.
static <K,V1,V2> SortedMap<K,V2>	Maps.transformValues(SortedMap<K,V1> fromMap, Function<? super V1,V2> function) Returns a view of a sorted map where each value is transformed by a function.
static <R,C,V1,V2> Table<R,C,V2>	Tables.transformValues(Table<R,C,V1> fromTable, Function<? super V1,V2> function) Returns a view of a table where each value is transformed by a function.
<K> ImmutableMap<K,E>	FluentIterable.uniqueIndex(Function<? super E,K> keyFunction) Returns a map with the contents of this FluentIterable as its values, indexed by keys derived from those values.
static <K,V> ImmutableMap<K,V>	Maps.uniqueIndex(Iterable<V> values, Function<? super V,K> keyFunction) Returns a map with the given values, indexed by keys derived from those values.
static <K,V> ImmutableMap<K,V>	Maps.uniqueIndex(Iterator<V> values, Function<? super V,K> keyFunction) Returns a map with the given values, indexed by keys derived from those values.
static <T> TreeTraverser<T>	TreeTraverser.using(Function<T,? extends Iterable<T>> nodeToChildrenFunction) Deprecated. Use Traverser.forTree(com.google.common.graph.SuccessorsFunction<N>) instead. If you are using a lambda, these methods have exactly the same signature.

Uses of Function in com.google.common.escape

Methods in com.google.common.escape that return Function

Modifier and Type	Method and Description
Function<String,String>	Escaper.asFunction() Returns a Function that invokes Escaper.escape(String) on this escaper.

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

Methods in com.google.common.util.concurrent with parameters of type Function

Modifier and Type	Method and Description
<X extends Throwable> FluentFuture<V>	FluentFuture.catching(Class<X> exceptionType, Function<? super X,? extends V> fallback, Executor executor) Returns a Future whose result is taken from this Future or, if this Future fails with the given exceptionType, from the result provided by the fallback.
static <V,X extends Throwable> ListenableFuture<V>	Futures.catching(ListenableFuture<? extends V> input, Class<X> exceptionType, Function<? super X,? extends V> fallback) Deprecated. Use the overload that requires an executor. For identical behavior, pass MoreExecutors.directExecutor(), but consider whether another executor would be safer, as discussed in the ListenableFuture.addListener documentation. This method is scheduled to be removed in April 2018.
static <V,X extends Throwable> ListenableFuture<V>	Futures.catching(ListenableFuture<? extends V> input, Class<X> exceptionType, Function<? super X,? extends V> fallback, Executor executor) Returns a Future whose result is taken from the given primary input or, if the primary input fails with the given exceptionType, from the result provided by the fallback.
static <I,O> Future<O>	Futures.lazyTransform(Future<I> input, Function<? super I,? extends O> function) Like Futures.transform(ListenableFuture, Function, Executor) except that the transformation function is invoked on each call to get() on the returned future.
static <V,X extends Exception> CheckedFuture<V,X>	Futures.makeChecked(ListenableFuture<V> future, Function<? super Exception,X> mapper) Deprecated. CheckedFuture cannot properly support the chained operations that are the primary goal of ListenableFuture. CheckedFuture also encourages users to rethrow exceptions from one thread in another thread, producing misleading stack traces. Additionally, it has a surprising policy about which exceptions to map and which to leave untouched. Guava users who want a CheckedFuture can fork the classes for their own use, possibly specializing them to the particular exception type they use. We recommend that most people use ListenableFuture and perform any exception wrapping themselves. This method is scheduled for removal from Guava in February 2018.
<T> FluentFuture<T>	FluentFuture.transform(Function<? super V,T> function, Executor executor) Returns a new Future whose result is derived from the result of this Future.
static <I,O> ListenableFuture<O>	Futures.transform(ListenableFuture<I> input, Function<? super I,? extends O> function) Deprecated. Use the overload that requires an executor. For identical behavior, pass MoreExecutors.directExecutor(), but consider whether another executor would be safer, as discussed in the ListenableFuture.addListener documentation. This method is scheduled to be removed in April 2018.
static <I,O> ListenableFuture<O>	Futures.transform(ListenableFuture<I> input, Function<? super I,? extends O> function, Executor executor) Returns a new Future whose result is derived from the result of the given Future.