PropertyValueFactory javafx

public class PropertyValueFactory<S,T>
extends java.lang.Object

implements Callback<TableColumn.CellDataFeatures<S,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:

 TableColumn<Person,String> firstNameCol = new TableColumn<Person,String>("First Name"); firstNameCol.setCellValueFactory(new PropertyValueFactory<Person,String>("firstName"));

 
In this example, the "firstName" string is used as a reference to an assumed firstNameProperty() method in the Person class type (which is the class type of the TableView items list). Additionally, this method must return a Property instance. If a method meeting these requirements is found, then the TableCell is populated with this ObservableValue. In addition, the TableView will automatically add an observer to the returned value, such that any changes fired will be observed by the TableView, resulting in the cell immediately updating.
If no method matching this pattern exists, there is fall-through support for attempting to call get<property>() or is<property>() (that is, getFirstName() or isFirstName() in the example above). If a method matching this pattern exists, the value returned from this method is wrapped in a ReadOnlyObjectWrapper and returned to the TableCell. However, in this situation, this means that the TableCell will not be able to observe the ObservableValue for changes (as is the case in the first approach above).


For reference (and as noted in the TableColumn cell value factory documentation), the long form of the code above would be the following:

TableColumn<Person,String> firstNameCol = new TableColumn<Person,String>("First Name"); firstNameCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {     public ObservableValue<String> call(CellDataFeatures<Person, String> p) {         // p.getValue() returns the Person instance for a particular TableView row         return p.getValue().firstNameProperty();     }  }); }

 
See Also:
TableColumn, TableView, TableCell, MapValueFactory