Package com.vaadin.flow.function

Interface ValueProvider<SOURCE,TARGET>

Type Parameters:
SOURCE - the type of the object used to provide the value
TARGET - the type of the provided value
All Superinterfaces:
Function<SOURCE,TARGET>, Serializable, SerializableFunction<SOURCE,TARGET>
All Known Subinterfaces:
IdentifierProvider<T>
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface ValueProvider<SOURCE,TARGET> extends SerializableFunction<SOURCE,TARGET>
A callback interface for providing values from a given source.

For example this interface can be implemented to simply extract a value with a getter, or to create a composite value based on the fields of the source object.

Since:
1.0.
Author:
Vaadin Ltd

  • Method Summary

    Modifier and Type
    Method
    Description
    TARGET
    apply(SOURCE source)
    Provides a value from the given source object.
    static <T> ValueProvider<T,T>
    identity()
    Returns a value provider that always returns its input argument.

    Methods inherited from interface java.util.function.Function

    andThen, compose

  • Method Details

    • identity

      static <T> ValueProvider<T,T> identity()
      Returns a value provider that always returns its input argument.
      Type Parameters:
      T - the type of the input and output objects to the function
      Returns:
      a function that always returns its input argument

    • apply

      TARGET apply(SOURCE source)
      Provides a value from the given source object.
      Specified by:
      apply in interface Function<SOURCE,TARGET>
      Parameters:
      source - the source to retrieve the value from
      Returns:
      the value provided by the source