Basic HTML version of Foils prepared May 19 99

Foil 28 Constrained Properties

From Javabeans Basic Information Track Computational Science Course CPS616 -- Spring Semester 1999. by Geoffrey Fox, Nancy McCracken, Wojtek Furmanski
JellyBean, an example with bound and constrained properties
A related concept is when another bean wants to have a possible veto over a change to a property, as in, for example, requiring a number to be in a certain range.
The set method of the property throws an exception called java.beans.PropertyVetoException.
The object must also support (by having add and remove methods) a VetoableChangeListener, i.e. the constrained property is also bound.
Then each bean that wants to be able to veto property changes implements VetoableChangeListener by supplying the method vetoableChange(PropertyChangeEvent e) throws PropertyVetoException

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