com.vaadin.data

Interface Property<T>

All Superinterfaces:

Serializable

All Known Subinterfaces:

Field<T>, Property.Transactional<T>

All Known Implementing Classes:

AbstractField, AbstractProperty, AbstractSelect, AbstractTextField, CheckBox, ColumnProperty, ComboBox, CustomField, DateField, Form, GeneratedPropertyContainer.GeneratedProperty, InlineDateField, Label, ListSelect, MethodProperty, NativeSelect, NestedMethodProperty, ObjectProperty, OptionGroup, PasswordField, PopupDateField, ProgressBar, ProgressIndicator, PropertyFormatter, RichTextArea, Select, Slider, Table, TextArea, TextField, TextFileProperty, TransactionalPropertyWrapper, Tree, TreeTable, TwinColSelect

public interface Property<T>
extends Serializable

The Property is a simple data object that contains one typed value. This interface contains methods to inspect and modify the stored value and its type, and the object's read-only state.

The Property also defines the events ReadOnlyStatusChangeEvent and ValueChangeEvent, and the associated listener and notifier interfaces.

The Property.Viewer interface should be used to attach the Property to an external data source. This way the value in the data source can be inspected using the Property interface.

The Property.editor interface should be implemented if the value needs to be changed through the implementing class.

Since:

3.0

Author:

Vaadin Ltd

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Property.Editor Interface implemented by the editor classes capable of editing the Property.
static class	Property.ReadOnlyException Exception object that signals that a requested Property modification failed because it's in read-only mode.
static interface	Property.ReadOnlyStatusChangeEvent An Event object specifying the Property whose read-only status has been changed.
static interface	Property.ReadOnlyStatusChangeListener The listener interface for receiving ReadOnlyStatusChangeEvent objects.
static interface	Property.ReadOnlyStatusChangeNotifier The interface for adding and removing ReadOnlyStatusChangeEvent listeners.
static interface	Property.Transactional<T> A Property that is capable of handle a transaction that can end in commit or rollback.
static interface	Property.ValueChangeEvent An Event object specifying the Property whose value has been changed.
static interface	Property.ValueChangeListener The listener interface for receiving ValueChangeEvent objects.
static interface	Property.ValueChangeNotifier The interface for adding and removing ValueChangeEvent listeners.
static interface	Property.Viewer Interface implemented by the viewer classes capable of using a Property as a data source.

Method Summary

Modifier and Type	Method and Description
Class<? extends T>	getType() Returns the type of the Property.
T	getValue() Gets the value stored in the Property.
boolean	isReadOnly() Tests if the Property is in read-only mode.
void	setReadOnly(boolean newStatus) Sets the Property's read-only mode to the specified status.
void	setValue(T newValue) Sets the value of the Property.

Method Detail

getValue

T getValue()

Gets the value stored in the Property. The returned object is compatible with the class returned by getType().

Returns:

the value stored in the Property

setValue

void setValue(T newValue)
       throws Property.ReadOnlyException

Sets the value of the Property.

Implementing this functionality is optional. If the functionality is missing, one should declare the Property to be in read-only mode and throw Property.ReadOnlyException in this function.

Note : Since Vaadin 7.0, setting the value of a non-String property as a String is no longer supported.

Parameters:

newValue - New value of the Property. This should be assignable to the type returned by getType

Throws:

Property.ReadOnlyException - if the object is in read-only mode

getType

Class<? extends T> getType()

Returns the type of the Property. The methods getValue and setValue must be compatible with this type: one must be able to safely cast the value returned from getValue to the given type and pass any variable assignable to this type as an argument to setValue.

Returns:

type of the Property

isReadOnly

boolean isReadOnly()

Tests if the Property is in read-only mode. In read-only mode calls to the method setValue will throw ReadOnlyException and will not modify the value of the Property.

Returns:

true if the Property is in read-only mode, false if it's not

setReadOnly

void setReadOnly(boolean newStatus)

Sets the Property's read-only mode to the specified status. This functionality is optional, but all properties must implement the isReadOnly mode query correctly.

Parameters:

newStatus - new read-only status of the Property