com.holonplatform.vaadin.flow.data

Interface ItemConverter<T,ITEM>

Type Parameters:

T - Value type

ITEM - Item type

public interface ItemConverter<T,ITEM>

Item to value converter.

Since:

5.2.0

Method Summary

Modifier and Type	Method and Description
static <T,ITEM> ItemConverter<T,ITEM>	create(Function<ITEM,T> toValue, Function<T,Optional<ITEM>> toItem) Create a new ItemConverter using given functions to perform conversions.
Optional<ITEM>	getItem(T value) Convert a value into an item instance, if available.
T	getValue(ITEM item) Convert an item instance into the required value type.
static <T> ItemConverter<T,T>	identity() Create a new ItemConverter for consistent item and value types, which do not perform any conversion.

Method Detail

getValue

T getValue(ITEM item)

Convert an item instance into the required value type.

Parameters:

item - Item instance

Returns:

The converted value

getItem

Optional<ITEM> getItem(T value)

Convert a value into an item instance, if available.

Parameters:

value - The value to convert

Returns:

Optional item instance

create

static <T,ITEM> ItemConverter<T,ITEM> create(Function<ITEM,T> toValue,
                                             Function<T,Optional<ITEM>> toItem)

Create a new ItemConverter using given functions to perform conversions.

Type Parameters:

T - Value type

ITEM - Item type

Parameters:

toValue - Function to convert the item into a value (not null)

toItem - Function to convert the value into an item, if available (not null)

Returns:

A new ItemConverter

identity

static <T> ItemConverter<T,T> identity()

Create a new ItemConverter for consistent item and value types, which do not perform any conversion.

Type Parameters:

T - Value and item type

Returns:

A new identity ItemConverter