/**
* Returns list of target atoms given the srcAtom for this interface
* @throws Exception
* @return Atom[] [description]
*/
public function getTgtAtoms()
{
$tgtAtoms = array();
try {
// If interface isIdent (i.e. expr = I[Concept]) we can return the srcAtom
if ($this->isIdent && $this->srcConcept == $this->tgtConcept) {
$tgtAtoms[] = new Atom($this->srcAtom->id, $this->tgtConcept, $this, $this->srcAtom->getQueryData());
// Else try to get tgt atom from srcAtom query data (in case of uni relation in same table)
} else {
$tgt = $this->srcAtom->getQueryData('ifc_' . $this->id);
// column is prefixed with ifc_
// $this->logger->debug("#217 One query saved due to reusing data from source atom");
if (!is_null($tgt)) {
$tgtAtoms[] = new Atom($tgt, $this->tgtConcept, $this);
}
}
} catch (Exception $e) {
// Column not defined, perform sub interface query
if ($e->getCode() == 1001) {
// TODO: fix this 1001 exception code handling by proper construct
$data = (array) $this->database->Exe($this->getQuery($this->srcAtom));
// Integrity check
if ($this->isUni && count($data) > 1) {
throw new Exception("Univalent (sub)interface returns more than 1 resource: '{$this->path}'", 500);
}
foreach ($data as $row) {
$tgtAtoms[] = new Atom($row['tgt'], $this->tgtConcept, $this, $row);
}
} else {
throw $e;
}
}
return $tgtAtoms;
}
/**
* Generate a new atom identifier for this concept
* @return string
*/
public function createNewAtomId()
{
static $prevTime = null;
if (strpos($this->name, '_AI') !== false && $this->isInteger()) {
$firstCol = current($this->mysqlConceptTable->getCols());
$query = "SELECT MAX(`{$firstCol->name}`) as `MAX` FROM `{$this->mysqlConceptTable->name}`";
$result = array_column((array) $this->database->Exe($query), 'MAX');
if (empty($result)) {
$atomId = 1;
} else {
$atomId = $result[0] + 1;
}
} else {
$now = explode(' ', microTime());
// yields ["microseconds", "seconds"] both in seconds, e.g. ["0.85629400", "1322761879"]
$time = $now[1] . substr($now[0], 2, 6);
// we drop the leading "0." and trailing "00" from the microseconds
// Guarantee that time is increased
if ($time <= $prevTime) {
$time = ++$prevTime;
} else {
$prevTime = $time;
}
$atomId = $this->name . '_' . $time;
}
return $atomId;
}
/**
* Delete provided Ampersand session atom from database
* @param string $sessionAtomId ampersand session atom id
* @return void
*/
private function destroyAmpersandSession($sessionAtomId)
{
$this->database->Exe("DELETE FROM `__SessionTimeout__` WHERE SESSION = '{$sessionAtomId}'");
$atom = new Atom($sessionAtomId, Concept::getConceptByLabel('SESSION'));
$atom->deleteAtom();
$this->database->commitTransaction();
}
/**
* Returns view array of key-value pairs for this atom
* @return array
*/
private function getView()
{
// If view is not already set
if (!isset($this->view)) {
$this->logger->debug("Get view for atom '{$this->__toString()}'");
$this->view = array();
// If parentIfc is set, use view as defined by interface (can be null)
if (isset($this->parentIfc)) {
$viewDef = $this->parentIfc->view;
} else {
$viewDef = $this->concept->getDefaultView();
}
// If there is a view definition
if (!is_null($viewDef)) {
foreach ($viewDef->segments as $viewSegment) {
$key = is_null($viewSegment->label) ? $viewSegment->seqNr : $viewSegment->label;
switch ($viewSegment->segType) {
case "Text":
$this->view[$key] = $viewSegment->text;
break;
case "Exp":
try {
// Try to get view segment from atom query data
$this->view[$key] = $this->getQueryData('view_' . $key);
// column is prefixed with view_
// $this->logger->debug("VIEW <{$viewDef->label}:{$key}> #217 Query saved due to reusing data from source atom");
} catch (Exception $e) {
// Column not defined, perform query
if ($e->getCode() == 1001) {
// TODO: fix this 1001 exception code handling by proper construct
$query = "/* VIEW <{$viewDef->label}:{$key}> */ SELECT DISTINCT `tgt` FROM ({$viewSegment->expSQL}) AS `results` WHERE `src` = '{$this->idEsc}' AND `tgt` IS NOT NULL";
$tgtAtoms = array_column((array) $this->database->Exe($query), 'tgt');
$this->view[$key] = count($tgtAtoms) ? $tgtAtoms[0] : null;
} else {
throw $e;
}
}
break;
default:
throw new Exception("Unsupported segmentType '{$viewSegment->segType}' in VIEW <{$viewDef->label}:{$key}>", 501);
// 501: Not implemented
break;
}
}
}
}
return $this->view;
}
/**
* Return array with all links (pair of Atoms) in this relation
* @return array[]
*/
public function getAllLinks()
{
// Query all atoms in table
$query = "SELECT `{$this->mysqlTable->srcCol()->name}` as `src`, `{$this->mysqlTable->tgtCol()->name}` as `tgt` FROM `{$this->mysqlTable->name}`";
return (array) $this->db->Exe($query);
}
