Module javafx.controls
Package javafx.scene.control.cell

## Class MapValueFactory<T>

- java.lang.Object
- - javafx.scene.control.cell.MapValueFactory<T>

- Type Parameters:
    `T` - The type of the class contained within the TableColumn cells.
  All Implemented Interfaces:
    `Callback<TableColumn.CellDataFeatures<Map,​T>,​ObservableValue<T>>`

      public class MapValueFactory<T>
      extends Object
      implements Callback<TableColumn.CellDataFeatures<Map,​T>,​ObservableValue<T>>

  A convenience implementation of the Callback interface, designed specifically for use within the `TableColumn` `cell value factory`. An example of how to use this class is:

       ObservableList<Map> personsMapList = ...

       TableColumn<Map, String> firstNameColumn = new TableColumn<Map, String>("First Name");
       firstNameColumn.setCellValueFactory(new MapValueFactory<String>("firstName"));

       TableView<Map> table = new TableView<Map>(personMapList);
       tableView.getColumns().setAll(firstNameColumn);

  In this example, there is a list of Map instances, where each Map instance representsa single row in the TableView. The "firstName" string is used as a key into this map, and the value corresponding to this key is returned, if one exists. If the value is an `ObservableValue`, then this is returned directly, otherwise the value is wrapped in a `ReadOnlyObjectWrapper`.

  Since:
    JavaFX 2.2
  See Also:
    `TableColumn`, `TableView`, `TableCell`, `PropertyValueFactory`

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `MapValueFactory​(Object key)` | Creates a default MapValueFactory, which will use the provided key to lookup the value for cells in the `TableColumn` in which this MapValueFactory is installed (via the `cell value factory` property.

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `ObservableValue<T>` | `call​(TableColumn.CellDataFeatures<Map,​T> cdf)` | The `call` method is called when required, and is given a single argument of type P, with a requirement that an object of type R is returned.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MapValueFactory

          public MapValueFactory​(Object key)

      Creates a default MapValueFactory, which will use the provided key to lookup the value for cells in the `TableColumn` in which this MapValueFactory is installed (via the `cell value factory` property.
      Parameters:
        `key` - The key to use to lookup the value in the `Map`.

  - ### Method Detail

    - #### call

          public ObservableValue<T> call​(TableColumn.CellDataFeatures<Map,​T> cdf)

      Description copied from interface: `Callback`
      The `call` method is called when required, and is given a single argument of type P, with a requirement that an object of type R is returned.
      Specified by:
        `call` in interface `Callback<TableColumn.CellDataFeatures<Map,​T>,​ObservableValue<T>>`
      Parameters:
        `cdf` - The single argument upon which the returned value should be determined.
      Returns:
        An object of type R that may be determined based on the provided parameter value.