/**
* Pops the form from a stack. If the stack is empty, the method
* throws an exception.
*
* @internal
* @static
* @param Opf_Form $form The form to be popped.
* @return Opf_Form
*/
public static function popFromStack(Opf_Form $form)
{
if (self::$_stack === null) {
self::$_stack = new SplStack();
}
$element = self::$_stack->pop();
if ($element !== $form) {
throw new Opf_Exception('Invalid form ' . $form->getName() . ' on stack ' . $element->getName());
}
return $element;
}
/**
* Adds a form to the list of forms to make it available for the
* templates. You do not have to use this method manually, as the
* forms register themselves in templates automatically.
*
* @static
* @param Opf_Form $form The form to register.
* @throws Opf_ItemAlreadyExists_Exception
*/
public static function addForm(Opf_Form $form)
{
if (isset(self::$_forms[$form->getName()])) {
throw new Opf_Exception('Form ' . $form->getName() . ' already exist.');
}
self::$_forms[$form->getName()] = $form;
}
