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.util.concurrent	Concurrency utilities.

Uses of Function in com.google.common.base

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) Creates a function that returns value for any input.
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 always returns the result of invoking Supplier.get() on supplier, regardless of its input.
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() Returns a function that calls toString() on its argument.
static <T extends Enum<T>> Function<String,T>	Enums.valueOfFunction(Class<T> enumClass) Returns a Function that maps an Enum name to the associated Enum constant.

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.
<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 delegete.

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 based on an existing function instance.

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 view of the set as a map, mapping keys from the set according to the specified 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.
abstract <K extends K0,V extends V0> ConcurrentMap<K,V>	GenericMapMaker.makeComputingMap(Function<? super K,? extends V> computingFunction) Deprecated.
<K,V> ConcurrentMap<K,V>	MapMaker.makeComputingMap(Function<? super K,? extends V> computingFunction) Deprecated. Caching functionality in MapMaker is being moved to CacheBuilder, with MapMaker.makeComputingMap(com.google.common.base.Function<? super K, ? extends V>) being replaced by CacheBuilder.build(com.google.common.cache.CacheLoader<? super K1, V1>). See the MapMaker Migration Guide for more details. This method is scheduled for deletion in February 2013.
<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 for which the elements of this FluentIterable are the keys in the same order, mapped to values by the given function.
static <K,V> ImmutableMap<K,V>	Maps.toMap(Iterable<K> keys, Function<? super K,V> valueFunction) Returns an immutable map for which the given keys are mapped to values by the given function in the order they appear in the original iterable.
static <K,V> ImmutableMap<K,V>	Maps.toMap(Iterator<K> keys, Function<? super K,V> valueFunction) Returns an immutable map for which the given keys are mapped to values by the given function in the order they appear in the original iterator.
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 an iterable that applies function to each element of fromIterable.
static <F,T> Iterator<T>	Iterators.transform(Iterator<F> fromIterator, Function<? super F,? extends T> function) Returns an iterator that applies 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 an immutable map for which the Map.values() are the elements of this FluentIterable in the given order, and each key is the product of invoking a supplied function on its corresponding value.
static <K,V> ImmutableMap<K,V>	Maps.uniqueIndex(Iterable<V> values, Function<? super V,K> keyFunction) Returns an immutable map for which the Map.values() are the given elements in the given order, and each key is the product of invoking a supplied function on its corresponding value.
static <K,V> ImmutableMap<K,V>	Maps.uniqueIndex(Iterator<V> values, Function<? super V,K> keyFunction) Returns an immutable map for which the Map.values() are the given elements in the given order, and each key is the product of invoking a supplied function on its corresponding value.

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
static <I,O> Future<O>	Futures.lazyTransform(Future<I> input, Function<? super I,? extends O> function) Like Futures.transform(ListenableFuture, Function) 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<Exception,X> mapper) Creates a CheckedFuture out of a normal ListenableFuture and a Function that maps from Exception instances into the appropriate checked type.
static <I,O> ListenableFuture<O>	Futures.transform(ListenableFuture<I> input, Function<? super I,? extends O> function) Returns a new ListenableFuture whose result is the product of applying the given Function to the result of the given Future.
static <I,O> ListenableFuture<O>	Futures.transform(ListenableFuture<I> input, Function<? super I,? extends O> function, Executor executor) Returns a new ListenableFuture whose result is the product of applying the given Function to the result of the given Future.