/**
* Updates the value of the inverse var
* @param epFieldMap $fm The field map toward the inverse var
* @param epObject &$o The opposite object
* @param string $actoin The update action to take: INVERSE_ADD|REMOVE
* @param bool $one_way Whether inverse update is one way only
* @return bool
*/
protected function _updateInverse($fm, &$o, $action = epObject::INVERSE_ADD, $one_way = true)
{
// check if object is epObject
if (!$o || !$o instanceof epObject) {
return false;
}
// no action if an object is updating (to prevent endless loop)
if ($o->epIsUpdating($action)) {
return true;
}
// get inverse var
if (!($ivar = $fm->getInverse())) {
return true;
}
// set inverse updating flag
if ($one_way) {
$this->epSetUpdating(true, $action);
}
$o->epSetUpdating(true, $action);
// a single-valued field
if (!$o->epIsMany($ivar)) {
switch ($action) {
case epObject::INVERSE_ADD:
$o[$ivar] = $this;
break;
case epObject::INVERSE_REMOVE:
$o[$ivar] = null;
break;
}
} else {
switch ($action) {
case epObject::INVERSE_ADD:
$o[$ivar][] = $this;
break;
case epObject::INVERSE_REMOVE:
$o[$ivar]->remove($this);
break;
}
}
// reset inverse updating flag
$o->epSetUpdating(false, $action);
if ($one_way) {
$this->epSetUpdating(false, $action);
}
return true;
}
/**
* Validate related class and inverse on a field map
* @param epFieldMap $fm the field map to be checked
* @param string $class the name of the class that the field belongs to
* @return array (errors)
*/
protected function _validateRelationshipField(&$fm, $class)
{
// array to hold error messages
$errors = array();
//
// 1. check the opposite class for the field
//
// string for class and field
$class_field = '[' . $class . '::' . $fm->getName() . ']';
// does the relation field have the related class defined?
if (!($rclass = $fm->getClass())) {
// shouldn't happend
$errors[] = $class_field . ' does not have opposite class specified';
return $errors;
}
// does the related class exist?
if (!isset($this->class_maps[$rclass])) {
// alert if not
$errors[] = 'Class [' . $rclass . '] for ' . $class_field . ' does not exist';
return $errors;
}
//
// 2. check inverse of the field
//
// does this field have an inverse?
if (!($inverse = $fm->getInverse())) {
return $errors;
}
// get the related class map
$rcm = $this->class_maps[$rclass];
// get all fields point to the current class in the related class
$rfields = $rcm->getFieldsOfClass($class);
// 2.a. default inverse (that is, set to true)
if (true === $inverse) {
// the related class must have only one relationship var to the current class
if (!$rfields) {
$errors[] = 'No inverse found for ' . $class_field;
} else {
if (count($rfields) > 1) {
$errors[] = 'Ambiguilty in the inverse of ' . $class_field;
} else {
$rfms = array_values($rfields);
$fm->setInverse($rfms[0]->getName());
$rfms[0]->setInverse($fm->getName());
}
}
return $errors;
}
// 2.b. inverse is specified
// check if inverse exists
if (!isset($rfields[$fm->getClass() . ':' . $inverse]) || !$rfields[$fm->getClass() . ':' . $inverse]) {
$errors[] = 'Inverse of ' . $class_field . ' (' . $fm->getClass() . '::' . $inverse . ') does not exist';
return $errors;
}
// get the field map for the inverse
$rfm = $rfields[$fm->getClass() . ':' . $inverse];
// set up the inverse on the other side -only if- inverse on the other side
// is -not- already set or set to default
if (!($rinverse = $rfm->getInverse()) || $rinverse === true) {
$rfm->setInverse($fm->getName());
return $errors;
}
// if specified, check duality
if ($class != $rfm->getClass() || $rinverse != $fm->getName()) {
$errors[] = 'Inverse of [' . $rcm->getName() . '::' . $fm->getName() . '] is not specified as ' . $class_field;
}
return $errors;
}
/**
* Update the value of the inverse var
* @param epObject $o the opposite object
* @param string $actoin UPDATE_INVERSE_ADD or UPDATE_INVERSE_REMOVE
* @return boolean
*/
protected function _updateInverse(&$o, $action = self::UPDATE_INVERSE_ADD)
{
// check if object is epObject
if (!$o || !$this->fm || !$o instanceof epObject) {
return false;
}
// get inverse var
if (!($ivar = $this->fm->getInverse())) {
return true;
}
// no action if an object is updating (to prevent endless loop)
if ($o->epIsUpdating()) {
return true;
}
// set inverse updating flag
$o->epSetUpdating(true);
// a single-valued field
if (!$o->epIsMany($ivar)) {
switch ($action) {
case self::UPDATE_INVERSE_ADD:
$o[$ivar] = $this->o;
break;
case self::UPDATE_INVERSE_REMOVE:
$o[$ivar] = null;
break;
}
} else {
switch ($action) {
case self::UPDATE_INVERSE_ADD:
$o[$ivar][] = $this->o;
break;
case self::UPDATE_INVERSE_REMOVE:
$o[$ivar]->remove($this->o);
break;
}
}
// reset inverse updating flag
$o->epSetUpdating(false);
return true;
}
