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<?php
/**
* Loads ElggEntity attributes from DB or validates those passed in via constructor
*
* @access private
*
* @package Elgg.Core
* @subpackage DataModel
*/
class ElggAttributeLoader {
/**
* @var array names of attributes in all entities
*/
protected static $primary_attr_names = array(
'guid',
'type',
'subtype',
'owner_guid',
'container_guid',
'site_guid',
'access_id',
'time_created',
'time_updated',
'last_action',
'enabled',
);
/**
* @var array names of secondary attributes required for the entity
*/
protected $secondary_attr_names = array();
/**
* @var string entity type (not class) required for fetched primaries
*/
protected $required_type;
/**
* @var array
*/
protected $initialized_attributes;
/**
* @var string class of object being loaded
*/
protected $class;
/**
* @var bool should access control be considered when fetching entity?
*/
public $requires_access_control = true;
/**
* @var callable function used to load attributes from {prefix}entities table
*/
public $primary_loader = 'get_entity_as_row';
/**
* @var callable function used to load attributes from secondary table
*/
public $secondary_loader = '';
/**
* @var callable function used to load all necessary attributes
*/
public $full_loader = '';
/**
* Constructor
*
* @param string $class class of object being loaded
* @param string $required_type entity type this is being used to populate
* @param array $initialized_attrs attributes after initializeAttributes() has been run
* @throws InvalidArgumentException
*/
public function __construct($class, $required_type, array $initialized_attrs) {
if (!is_string($class)) {
throw new InvalidArgumentException('$class must be a class name.');
}
$this->class = $class;
if (!is_string($required_type)) {
throw new InvalidArgumentException('$requiredType must be a system entity type.');
}
$this->required_type = $required_type;
$this->initialized_attributes = $initialized_attrs;
unset($initialized_attrs['tables_split'], $initialized_attrs['tables_loaded']);
$all_attr_names = array_keys($initialized_attrs);
$this->secondary_attr_names = array_diff($all_attr_names, self::$primary_attr_names);
}
/**
* Get primary attributes missing that are missing
*
* @param stdClass $row Database row
* @return array
*/
protected function isMissingPrimaries($row) {
return array_diff(self::$primary_attr_names, array_keys($row)) !== array();
}
/**
* Get secondary attributes that are missing
*
* @param stdClass $row Database row
* @return array
*/
protected function isMissingSecondaries($row) {
return array_diff($this->secondary_attr_names, array_keys($row)) !== array();
}
/**
* Check that the type is correct
*
* @param stdClass $row Database row
* @return void
* @throws InvalidClassException
*/
protected function checkType($row) {
if ($row['type'] !== $this->required_type) {
$msg = elgg_echo('InvalidClassException:NotValidElggStar', array($row['guid'], $this->class));
throw new InvalidClassException($msg);
}
}
/**
* Get all required attributes for the entity, validating any that are passed in. Returns empty array
* if can't be loaded (Check $failure_reason).
*
* This function splits loading between "primary" attributes (those in {prefix}entities table) and
* "secondary" attributes (e.g. those in {prefix}objects_entity), but can load all at once if a
* combined loader is available.
*
* @param mixed $row a row loaded from DB (array or stdClass) or a GUID
* @return array will be empty if failed to load all attributes (access control or entity doesn't exist)
*
* @throws InvalidArgumentException|LogicException|IncompleteEntityException
*/
public function getRequiredAttributes($row) {
if (!is_array($row) && !($row instanceof stdClass)) {
// assume row is the GUID
$row = array('guid' => $row);
}
$row = (array) $row;
if (empty($row['guid'])) {
throw new InvalidArgumentException('$row must be or contain a GUID');
}
// these must be present to support isFullyLoaded()
foreach (array('tables_split', 'tables_loaded') as $key) {
if (isset($this->initialized_attributes[$key])) {
$row[$key] = $this->initialized_attributes[$key];
}
}
$was_missing_primaries = $this->isMissingPrimaries($row);
$was_missing_secondaries = $this->isMissingSecondaries($row);
// some types have a function to load all attributes at once, it should be faster
if (($was_missing_primaries || $was_missing_secondaries) && is_callable($this->full_loader)) {
$fetched = (array) call_user_func($this->full_loader, $row['guid']);
if (!$fetched) {
return array();
}
$row = array_merge($row, $fetched);
$this->checkType($row);
} else {
if ($was_missing_primaries) {
if (!is_callable($this->primary_loader)) {
throw new LogicException('Primary attribute loader must be callable');
}
if ($this->requires_access_control) {
$fetched = (array) call_user_func($this->primary_loader, $row['guid']);
} else {
$ignoring_access = elgg_set_ignore_access();
$fetched = (array) call_user_func($this->primary_loader, $row['guid']);
elgg_set_ignore_access($ignoring_access);
}
if (!$fetched) {
return array();
}
$row = array_merge($row, $fetched);
}
// We must test type before trying to load the secondaries so that InvalidClassException
// gets thrown. Otherwise the secondary loader will fail and return false.
$this->checkType($row);
if ($was_missing_secondaries) {
if (!is_callable($this->secondary_loader)) {
throw new LogicException('Secondary attribute loader must be callable');
}
$fetched = (array) call_user_func($this->secondary_loader, $row['guid']);
if (!$fetched) {
if ($row['type'] === 'site') {
// A special case is needed for sites: When vanilla ElggEntities are created and
// saved, these are stored w/ type "site", but with no sites_entity row. These
// are probably only created in the unit tests.
// @todo Don't save vanilla ElggEntities with type "site"
$row = $this->filterAddedColumns($row);
$row['guid'] = (int) $row['guid'];
return $row;
}
throw new IncompleteEntityException("Secondary loader failed to return row for {$row['guid']}");
}
$row = array_merge($row, $fetched);
}
}
$row = $this->filterAddedColumns($row);
// Note: If there are still missing attributes, we're running on a 1.7 or earlier schema. We let
// this pass so the upgrades can run.
// guid needs to be an int http://trac.elgg.org/ticket/4111
$row['guid'] = (int) $row['guid'];
return $row;
}
/**
* Filter out keys returned by the query which should not appear in the entity's attributes
*
* @param array $row All columns from the query
* @return array Columns acceptable for the entity's attributes
*/
protected function filterAddedColumns($row) {
// make an array with keys as acceptable attribute names
$acceptable_attrs = self::$primary_attr_names;
array_splice($acceptable_attrs, count($acceptable_attrs), 0, $this->secondary_attr_names);
$acceptable_attrs = array_combine($acceptable_attrs, $acceptable_attrs);
// @todo remove these when #4584 is in place
$acceptable_attrs['tables_split'] = true;
$acceptable_attrs['tables_loaded'] = true;
foreach ($row as $key => $val) {
if (!isset($acceptable_attrs[$key])) {
unset($row[$key]);
}
}
return $row;
}
}
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