/**
* Checks if the given attribute is defined, this means, neither <code>null</code> nor <code>
* ScriptingEngine.getUndefinedValue()</code>.
*
* @param model the data model to use
* @param name Name of the attribute.
* @return <code>true</code> if the attribute is defined.
*/
protected boolean isAttributeDefined(DataModel model, final String name) {
final Object value = attributes.get(name);
if (value == null) {
return false;
}
return model.getUndefinedValue() != value;
}
