@Override
public boolean validate(ListChangeEvent event) {
boolean b = true;
switch (event.getAction()) {
case add:
case append:
case addAndSelect:
Object e = event.getElement();
if (e == null || contains(e)) {
b = false;
}
break;
case addAll:
case appendAll:
Collection c = event.getCollection();
if (containsAny(c) || containsNull(c)) {
b = false;
}
case set:
e = event.getElement(); // new element in set method
// Document old = (Document)event.getResult();
if (e == null || contains(e)) {
b = false;
}
break;
}
return b;
}
/**
* Creates a new object of type <code>ListChangeEvent</code>. Sets the event properties values:
*
* <ul>
* <li>action to {@link ListChangeEvent.Action#addSelect}
* <li>element to the value of the parameter <code>e</code>
* <li>result to the same value as <code>e</code> or null if element cannot be added.
* </ul>
*
* @param e the element to be added
* @param result <code>true</code> if the element added otherwise <code>false</code>
* @return a new instance of {@link ListChangeEvent }
*/
protected ListChangeEvent createAddAndSelect(E e, boolean result) {
ListChangeEvent event = new ListChangeEvent(this, ListChangeEvent.Action.addAndSelect);
event.setElement(e);
event.setResult(result);
if (result) {
event.setIndex(this.size() - 1);
} else {
event.setIndex(-1);
}
return event;
}
