Interface Function<F extends @Nullable Object,T extends @Nullable Object>
-
- All Superinterfaces:
Function<F,T>
- All Known Subinterfaces:
LoadingCache<K,V>
- All Known Implementing Classes:
AbstractLoadingCache
,Converter
,ForwardingLoadingCache
,ForwardingLoadingCache.SimpleForwardingLoadingCache
- Functional Interface:
- This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@GwtCompatible @FunctionalInterface public interface Function<F extends @Nullable Object,T extends @Nullable Object> extends Function<F,T>
Legacy version ofjava.util.function.Function
.The
Functions
class provides common functions and related utilities.As this interface extends
java.util.function.Function
, an instance of this type can be used as ajava.util.function.Function
directly. To use ajava.util.function.Function
in a context where acom.google.common.base.Function
is needed, usefunction::apply
.This interface is now a legacy type. Use
java.util.function.Function
(or the appropriate primitive specialization such asToIntFunction
) instead whenever possible. Otherwise, at least reduce explicit dependencies on this type by using lambda expressions or method references instead of classes, leaving your code easier to migrate in the future.See the Guava User Guide article on the use of
Function
.- Since:
- 2.0
- Author:
- Kevin Bourrillion
-
-
Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description T
apply(F input)
Applies this function to the given argument.boolean
equals(Object object)
May returntrue
ifobject
is aFunction
that behaves identically to this function.
-
-
-
Method Detail
-
apply
@CanIgnoreReturnValue T apply(F input)
Description copied from interface:java.util.function.Function
Applies this function to the given argument.
-
equals
boolean equals(@CheckForNull Object object)
May returntrue
ifobject
is aFunction
that behaves identically to this function.Warning: do not depend on the behavior of this method.
Historically,
Function
instances in this library have implemented this method to recognize certain cases where distinctFunction
instances would in fact behave identically. However, as code migrates tojava.util.function
, that behavior will disappear. It is best not to depend on it.- Overrides:
equals
in classObject
- Parameters:
object
- the reference object with which to compare.- Returns:
true
if this object is the same as the obj argument;false
otherwise.- See Also:
Object.hashCode()
,HashMap
-
-