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	Discouraged (in favor of Caffeine) caching utilities.
com.google.common.collect	Collection interfaces and implementations, and other utilities for 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	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	Description
static <A extends @Nullable java.lang.Object,B extends @Nullable java.lang.Object,C extends @Nullable java.lang.Object> Function<A,C>	Functions.compose(Function<B,C> g, Function<A,? extends B> f)	Returns the composition of two functions.
static <E extends @Nullable java.lang.Object> Function<@Nullable java.lang.Object,E>	Functions.constant(E value)	Returns a function that ignores its input and always returns value.
static <K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object> Function<K,V>	Functions.forMap(java.util.Map<K,? extends V> map, V defaultValue)	Returns a function which performs a map lookup with a default value.
static <K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object> Function<K,V>	Functions.forMap(java.util.Map<K,V> map)	Returns a function which performs a map lookup.
static <T extends @Nullable java.lang.Object> Function<T,java.lang.Boolean>	Functions.forPredicate(Predicate<T> predicate)	Creates a function that returns the same boolean output as the given predicate for all inputs.
static <F extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> Function<F,T>	Functions.forSupplier(Supplier<T> supplier)	Returns a function that ignores its input and returns the result of supplier.get().
static <E extends @Nullable java.lang.Object> Function<E,E>	Functions.identity()	Returns the identity function.
static <T extends @Nullable java.lang.Object> 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<java.lang.Object,java.lang.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	Description
static <A extends @Nullable java.lang.Object,B extends @Nullable java.lang.Object,C extends @Nullable java.lang.Object> Function<A,C>	Functions.compose(Function<B,C> g, Function<A,? extends B> f)	Returns the composition of two functions.
static <A extends @Nullable java.lang.Object,B extends @Nullable java.lang.Object> Predicate<A>	Predicates.compose(Predicate<B> predicate, Function<A,? extends B> function)	Returns the composition of a function and a predicate.
static <F extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> 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> 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<? super F,? extends @Nullable 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	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	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	Description
static <K,V> CacheLoader<K,V>	CacheLoader.from(Function<K,V> function)	Returns a cache loader that uses function to load keys, 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	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	Description
static <K extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object> java.util.NavigableMap<K,V>	Maps.asMap(java.util.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 extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object> java.util.Map<K,V>	Maps.asMap(java.util.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 extends @Nullable java.lang.Object,V extends @Nullable java.lang.Object> java.util.SortedMap<K,V>	Maps.asMap(java.util.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,@NonNull 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(java.lang.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(java.util.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 extends @Nullable java.lang.Object> 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<@NonNull 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(java.lang.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(java.util.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 extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> java.util.Collection<T>	Collections2.transform(java.util.Collection<F> fromCollection, Function<? super F,T> function)	Returns a collection that applies function to each element of fromCollection.
<T extends @Nullable java.lang.Object> 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 extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> java.lang.Iterable<T>	Iterables.transform(java.lang.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 extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> java.util.Iterator<T>	Iterators.transform(java.util.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 extends @Nullable java.lang.Object,T extends @Nullable java.lang.Object> java.util.List<T>	Lists.transform(java.util.List<F> fromList, Function<? super F,? extends T> function)	Returns a list that applies function to each element of fromList.
<T extends @Nullable java.lang.Object> FluentIterable<T>	FluentIterable.transformAndConcat(Function<? super E,? extends java.lang.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 extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> java.util.Map<K,V2>	Maps.transformValues(java.util.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 extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> java.util.NavigableMap<K,V2>	Maps.transformValues(java.util.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 extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> java.util.SortedMap<K,V2>	Maps.transformValues(java.util.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 <K extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> 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 extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> 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 <R extends @Nullable java.lang.Object,C extends @Nullable java.lang.Object,V1 extends @Nullable java.lang.Object,V2 extends @Nullable java.lang.Object> 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,@NonNull 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(java.lang.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(java.util.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 java.lang.Iterable<T>> nodeToChildrenFunction)	Deprecated. Use Traverser.forTree(com.google.common.graph.SuccessorsFunction<N>) instead.

Uses of Function in com.google.common.escape

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

Modifier and Type	Method	Description
Function<java.lang.String,java.lang.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	Description
<X extends java.lang.Throwable> FluentFuture<V>	FluentFuture.catching(java.lang.Class<X> exceptionType, Function<? super X,? extends V> fallback, java.util.concurrent.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 extends @Nullable java.lang.Object,X extends java.lang.Throwable> ListenableFuture<V>	Futures.catching(ListenableFuture<? extends V> input, java.lang.Class<X> exceptionType, Function<? super X,? extends V> fallback, java.util.concurrent.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 extends @Nullable java.lang.Object,O extends @Nullable java.lang.Object> java.util.concurrent.Future<O>	Futures.lazyTransform(java.util.concurrent.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.
<T extends @Nullable java.lang.Object> FluentFuture<T>	FluentFuture.transform(Function<? super V,T> function, java.util.concurrent.Executor executor)	Returns a new Future whose result is derived from the result of this Future.
static <I extends @Nullable java.lang.Object,O extends @Nullable java.lang.Object> ListenableFuture<O>	Futures.transform(ListenableFuture<I> input, Function<? super I,? extends O> function, java.util.concurrent.Executor executor)	Returns a new Future whose result is derived from the result of the given Future.