org.dmd.mvw.client.mvwforms.base

Class FieldInstance

java.lang.Object

org.dmd.mvw.client.mvwforms.base.FieldInstance

public abstract class FieldInstance
extends Object

The FieldInstance provides a common base for the presentation, editting and determination of changes to an attribute associated with a Dark Matter Object (DMO). No assumptions are made about how the field is presented i.e. what type of widgets are used; that is up to whoever creates the form implementation for a particular widget set. At this level, we are only concerned with providing a consistent interface to a "field".

The decision was made to define the various classes associated with form binding as orthogonal to those related to presentation so that common functionality for a particular implementation of forms could be encapsulated in base classes that had nothing to do with the widgets i.e. the widgets are wrapped by the field implementations. This approach gives the best flexibility and reduction in duplicate code.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.dmd.dmc.DmcAttribute<?>	newValue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FieldInstance(org.dmd.dmc.DmcAttributeInfo ai, String label, String tooltip, boolean mandatory)

Method Summary

Modifier and Type	Method and Description
void	setNewValueHolder() This method is called after the field is constructed by the generated code that creates the FieldInstance.
abstract void	setValue(org.dmd.dmc.DmcAttribute<?> value) Sets the value to be displayed in this field.

Methods inherited from class java.lang.Object

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

Field Detail

newValue

protected org.dmd.dmc.DmcAttribute<?> newValue

Constructor Detail

FieldInstance

protected FieldInstance(org.dmd.dmc.DmcAttributeInfo ai,
                        String label,
                        String tooltip,
                        boolean mandatory)

Parameters:

ai -

label -

tooltip -

mandatory -

Method Detail

setNewValueHolder

public void setNewValueHolder()

This method is called after the field is constructed by the generated code that creates the FieldInstance. THIS METHOD SHOULD NOT BE CALLED IN OTHER CIRCUMSTANCES!

setValue

public abstract void setValue(org.dmd.dmc.DmcAttribute<?> value)

Sets the value to be displayed in this field. Exactly how this is done is implementation specific.

Parameters:

value - The attribute to be displayed.