ValueProvider (Vaadin Platform (vaadin-platform-javadoc) 23.3.1 API)

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

All Methods Static Methods Instance Methods Abstract Methods
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 Detail
  - 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