/**
* 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;
}
/**
* Checks if the value to be set matches the type set in the field map
* @param epObject|string $value The value to be set
* @param epFieldMap $fm The field map for the value
* @return bool
*/
protected function _typeMatches($value, $fm)
{
// no check if no manager
if (!$this->ep_m) {
return true;
}
// no checking on primitve, ignore false|null|empty, and non-epObject
if ($fm->isPrimitive() || !$value) {
// always true
return true;
}
// epObject
if ($value instanceof epObject) {
return $this->_isClassOf($this->ep_m->getClass($value), $fm->getClass());
} else {
if (is_array($value) || $value instanceof epArray) {
foreach ($value as $k => $v) {
if (!$v instanceof epObject) {
continue;
}
if (!$this->_isClassOf($this->ep_m->getClass($v), $fm->getClass())) {
return false;
}
}
return true;
}
}
return true;
}
/**
* Make where part of a SQL select for relationship fields
* @param epDbObject $db the db connection
* @param epFieldMap $fm the field map
* @param epClassMap $cm the child object for query
* @param string $alias the alias of this table in the previous part
* @return array('from', 'where')
* @author Oak Nauhygon <*****@*****.**>
* @author Trevan Richins <*****@*****.**>
*/
public static function sqlSelectRelations($db, $fm, $cm, $table, $alias, $parentTable)
{
$base_a = $fm->getClassMap()->getName();
$class_a = $cm->getName();
$var_a = $fm->getName();
$base_b = $fm->getClass();
// call manager to get relation table for base class a and b
$rt = epManager::instance()->getRelationTable($base_a, $base_b);
// the alias of the table we are dealing with right now
$tbAlias = '_' . $alias;
$rtAlias = 'rt' . $alias;
// quoted aliases (avoid repeating)
$tbAlias_q = $db->quoteId($tbAlias);
$rtAlias_q = $db->quoteId($rtAlias);
// compute 'from' parts: tables with aliases
$from = array();
$from[] = $db->quoteId($table) . ' AS ' . $tbAlias_q;
$from[] = $db->quoteId($rt) . ' AS ' . $rtAlias_q;
// compute expressions 'where'
$where = array();
// rt.class_a =
$where[] = $rtAlias_q . '.' . $db->quoteId('class_a') . ' = ' . $db->quote($class_a);
// rt.var_a =
$where[] = $rtAlias_q . '.' . $db->quoteId('var_a') . ' = ' . $db->quote($var_a);
// rt.base_b =
$where[] = $rtAlias_q . '.' . $db->quoteId('base_b') . ' = ' . $db->quote($base_b);
// rt.class_b = TODO: doesn't look like it is used
//$where .= 'rt.'.$db->quoteId('class_b') . ' = ' . $db->quote($val->getClass());
// A.oid = rt.oid_a
$where[] = $db->quoteId($parentTable) . '.' . $db->quoteId($cm->getOidColumn()) . ' = ' . $rtAlias_q . '.' . $db->quoteId('oid_a');
// Child.oid = rt.oid_b
$where[] = $tbAlias_q . '.' . $db->quoteId($fm->getClassMap()->getOidColumn()) . ' = ' . $rtAlias_q . '.' . $db->quoteId('oid_b');
return array('from' => $from, 'where' => $where);
}
/**
* Returns the relation ids for the variable specified of the object
* @param epObject $o the object
* @param epFieldMap $fm the field map of the variable
* @param epClassMap $cm the class map of the object
* @return false|string|array
*/
public function getRelationIds(&$o, $fm, $cm)
{
// make sure we are dealing with valid object and non-primitive field
if (!$o || !$fm || !$cm) {
return false;
}
// object needs to have a valid id and has to be non-primitive
if (!($oid_a = $o->epGetObjectId())) {
return false;
}
// get class_a, var_a, and the related class
$base_a = $fm->getClassMap()->getName();
$class_a = $cm->getName();
$var_a = $fm->getName();
$base_b = $fm->getClass();
if (!$base_a || !$class_a || !$var_a || !$base_b) {
throw new epExceptionManager('Cannot find related class for var [' . $class_a . '::' . $var_a . ']');
return false;
}
// switch relations table
$this->_setRelationTable($base_a, $base_b);
// make an example relation objects
if (!($eo =& $this->_relationExample($class_a, $oid_a, $var_a, $base_b))) {
return false;
}
// find all relation objects using the example object
$rs =& parent::find($eo, EP_GET_FROM_DB, false);
// find from db only, false no cache
// convert result into oids
$oids_b = null;
if ($fm->isSingle()) {
if (is_array($rs) && count($rs) > 1) {
throw new epExceptionManager('Field ' . $fm->getName() . ' mapped as composed_of_/has_one but is associated with > 1 objects');
return false;
}
if ($rs) {
$oids_b = $this->_encodeClassOid($rs[0]->get_class_b(), $rs[0]->get_oid_b());
}
} else {
if ($fm->isMany()) {
$oids_b = array();
if ($rs) {
foreach ($rs as $r) {
$oids_b[] = $this->_encodeClassOid($r->get_class_b(), $r->get_oid_b());
}
}
}
}
return $oids_b;
}
/**
* Builds SQL statement from 'contains' or alias assignment node
* @param epQueryNode &$node either a 'contains' node or an assignment node
* @param epFieldMap $fm the starting field map
* @param array $var_exprs expressions for var
* @param array|epObject $arg the argument|value for the operation
* @return false|string
* @throws epExceptionQueryBuilder
*/
protected function _buildSqlRelationship(epQueryNode &$node, $fm, $var_exprs, $arg)
{
// is arg a string
if (is_string($arg)) {
// go through each where (notice &)
foreach ($var_exprs as $alias => &$expr) {
// remove last alias
$expr = str_replace($alias, $arg, $expr);
// remove this alias (important)
unset($this->aliases[$alias]);
}
return implode(' OR ', $var_exprs);
} else {
if (is_array($arg) || $arg instanceof epObject) {
// convert array to an object
$o = $arg;
if (is_array($arg)) {
// false: no event dispatching, true: null vars if no value
$o =& $this->em->createFromArray($fm->getClass(), $arg, false, true);
// object and children not to be committed
$o->epSetCommittable(false, true);
}
// array to keep all expressions
$exprs = array();
// go through each var exprs
foreach ($var_exprs as $var_alias => $var_expr) {
// build sql for array or object
$obj_exprs = $this->_buildSqlObject($o, $fm, $var_alias);
// go through each returned expr from the array or object
foreach ($obj_exprs as $obj_expr) {
$exprs[] = $obj_expr . ' AND ' . $var_expr;
}
}
return implode(' OR ', $exprs);
}
}
// unrecognized
throw new epExceptionQueryBuilder($this->_e("Unrecognized argument in 'contains()'", $node));
return false;
}
