groovy.beans

## Annotation Type Vetoable

-     @Documented
       @Retention(value=SOURCE)
       @Target(value={FIELD,TYPE})
      public @interface Vetoable

  Annotates a groovy property or a class.

  When annotating a property it indicates that the property should be a constrained property according to the JavaBeans spec, subject to listeners vetoing the property change.

  When annotating a class it indicates that all groovy properties in that class should be bound as though each property had the annotation (even if it already has it explicitly).

  It is a compilation error to place this annotation on a field (that is not a property, i.e. has scope visibility modifiers).

  If a property with a user defined setter method is annotated the code block is wrapped with the needed code to fire off the event.

  Here is a simple example of how to annotate a class with Vetoable:

       @groovy.beans.Vetoable
       class Person {
           String firstName
           def zipCode
       }

  This code is transformed by the compiler into something resembling the following snippet. Notice the difference between a String and a def/Object property:

       public class Person implements groovy.lang.GroovyObject {
           private java.lang.String firstName
           private java.lang.Object zipCode
           final private java.beans.VetoableChangeSupport this$vetoableChangeSupport

           public Person() {
               this$vetoableChangeSupport = new java.beans.VetoableChangeSupport(this)
           }

           public void addVetoableChangeListener(java.beans.VetoableChangeListener listener) {
               this$vetoableChangeSupport.addVetoableChangeListener(listener)
           }

           public void addVetoableChangeListener(java.lang.String name, java.beans.VetoableChangeListener listener) {
               this$vetoableChangeSupport.addVetoableChangeListener(name, listener)
           }

           public void removeVetoableChangeListener(java.beans.VetoableChangeListener listener) {
               this$vetoableChangeSupport.removeVetoableChangeListener(listener)
           }

           public void removeVetoableChangeListener(java.lang.String name, java.beans.VetoableChangeListener listener) {
               this$vetoableChangeSupport.removeVetoableChangeListener(name, listener)
           }

           public void fireVetoableChange(java.lang.String name, java.lang.Object oldValue, java.lang.Object newValue) throws java.beans.PropertyVetoException {
               this$vetoableChangeSupport.fireVetoableChange(name, oldValue, newValue)
           }

           public java.beans.VetoableChangeListener[] getVetoableChangeListeners() {
               return this$vetoableChangeSupport.getVetoableChangeListeners()
           }

           public java.beans.VetoableChangeListener[] getVetoableChangeListeners(java.lang.String name) {
               return this$vetoableChangeSupport.getVetoableChangeListeners(name)
           }

           public void setFirstName(java.lang.String value) throws java.beans.PropertyVetoException {
               this.fireVetoableChange('firstName', firstName, value)
               firstName = value
           }

           public void setZipCode(java.lang.Object value) throws java.beans.PropertyVetoException {
               this.fireVetoableChange('zipCode', zipCode, value)
               zipCode = value
           }
       }

  See Also:
    `VetoableASTTransformation`