/**
* Creates a IValueHolder instance for a given combination of IField and raw value.
*
* @param IField $field
* @param mixed $raw_value
*
* @return IValueHolder
*/
protected function createValueHolder(IField $field, $raw_value)
{
$value_holder = $field->createValueHolder($raw_value);
if ($value_holder instanceof AggregateValueHolder) {
// Listen to all changes made to AggregateValueHolder instances corresponding to our related fields
// and propagte those changes to our listeners such as the ValuesHolder parent document.
$value_holder->addAggregateChangedListener($this);
}
return $value_holder;
}
