How can i get the value stored by a Property DataModel implementation

Vaadin 6 / 7 / 8 Framework Data Binding
1

It is just a simple TEST application


import br.com.elf.ui.IndexApplication;

public class IndexApplication extends Application {

    public void init() {
        setMainWindow(getStartUpWindow());
    }

    private Window getStartUpWindow() {
        Window mainWindow = new Window();

        mainWindow.addComponent(
            new Label(new Property() {
                public Object getValue() {
                    return "DataModel Example";
                }

                public void setValue(Object value) throws ReadOnlyException, ConversionException {
                    throw new ReadOnlyException();
                }

                public Class<?> getType() {
                    return String.class;
                }

                public boolean isReadOnly() {
                    return true;
                }

                public void setReadOnly(boolean readyOnly) {
                    // Empty body
                }
            ));
        }

        return mainWindow;
    }

}

Notice i have i plain Label field. I know i can just call


mainWindow.addComponent(new Label("DataModel Example"));

nstead.
But in order to see how Property DataModel works behind the scenes
, i have added a Property implementation. But instead of seeing in output


DataModel Example

I see


br.com.elf.ui.IndexApplication$1@63a721

Why ???

And what the real purpose of Object getType() method defined in Property interface ??? If HTML shows its output in plain String, so i think there is no reason to implement a Object getType(), do not ???

regards,

2

I found out why,

The method used to show its value in human-redable textual format is
toString
. As said in Property API


returns the value of the Property in
human readable textual format
.


mainWindow.addComponent(new Label(new Property() {
            public Object getValue() {
                return "Wellcome to Vaadin!";
            }

            public void setValue(Object newValue) throws ReadOnlyException, ConversionException {
                throw new ReadOnlyException();
            }

            public Class<?> getType() {
                return String.class;
            }

            public boolean isReadOnly() {
                return true;
            }

            public void setReadOnly(boolean newStatus) {
                throw new UnsupportedOperationException();
            }

            @Override
            public String toString() {
                return (String) getValue();
            }
        }));

And getType method tells you
the type stored by this Property
, nothing else. It can be anything, even a Account class, for instance. The value shown by the Component itself
is always derived from toString method
.

regards,