Package com.google.common.base

Interface Function<F,​T>

  • All Superinterfaces:
    <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

public interface Function<F,​T>
extends <F,​T>
    Legacy version of .

    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 a java.util.function.Function directly. To use a java.util.function.Function in a context where a com.google.common.base.Function is needed, use function::apply.

    This interface is now a legacy type. Use java.util.function.Function (or the appropriate primitive specialization such as ToIntFunction) 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 .

    Since:
    2.0
    Author:
    Kevin Bourrillion

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      T F input)
      Applies this function to the given argument.
      boolean  object)
      May return true if object is a Function that behaves identically to this function.

      • Methods inherited from interface java.util.function.

        ,

    • Method Detail

      • apply

          F input)
        Description copied from interface: 
        Applies this function to the given argument.
        Specified by:
         in interface <F,​T>
        Parameters:
        input - the function argument
        Returns:
        the function result

      • equals

        boolean   object)
        May return true if object is a Function 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 distinct Function instances would in fact behave identically. However, as code migrates to java.util.function, that behavior will disappear. It is best not to depend on it.

        Overrides:
         in class 
        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:
        ,