--- /dev/null
+<?php
+
+/**
+ * Loads ElggEntity attributes from DB or validates those passed in via constructor
+ *
+ * @access private
+ */
+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 = '';
+
+ /**
+ * @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::$primary_attr_names);
+ }
+
+ protected function isMissingPrimaries($row) {
+ return array_diff(self::$primary_attr_names, array_keys($row)) !== array();
+ }
+
+ protected function isMissingSecondaries($row) {
+ return array_diff($this->secondary_attr_names, array_keys($row)) !== array();
+ }
+
+ protected function checkType($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) {
+ $ignoring_access = elgg_set_ignore_access();
+ }
+ $fetched = (array) call_user_func($this->primary_loader, $row['guid']);
+ if (!$this->requires_access_control) {
+ 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['guid'] = (int) $row['guid'];
+ return $row;
+ }
+ throw new IncompleteEntityException("Secondary loader failed to return row for {$row['guid']}");
+ }
+ $row = array_merge($row, $fetched);
+ }
+ }
+
+ // loading complete: re-check missing and check type
+ if (($was_missing_primaries && $this->isMissingPrimaries($row))
+ || ($was_missing_secondaries && $this->isMissingSecondaries($row))) {
+ throw new LogicException('Attribute loaders failed to return proper attributes');
+ }
+
+ // guid needs to be an int http://trac.elgg.org/ticket/4111
+ $row['guid'] = (int) $row['guid'];
+
+ return $row;
+ }
+}
* @return bool
*/
protected function load($guid) {
- // Test to see if we have the generic stuff
- if (!parent::load($guid)) {
- return false;
- }
+ $attr_loader = new ElggAttributeLoader(get_class(), 'group', $this->attributes);
+ $attr_loader->requires_access_control = !($this instanceof ElggPlugin);
+ $attr_loader->secondary_loader = 'get_group_entity_as_row';
- // Only work with GUID from here
- if ($guid instanceof stdClass) {
- $guid = $guid->guid;
- }
-
- // Check the type
- if ($this->attributes['type'] != 'group') {
- $msg = elgg_echo('InvalidClassException:NotValidElggStar', array($guid, get_class()));
- throw new InvalidClassException($msg);
- }
-
- // Load missing data
- $row = get_group_entity_as_row($guid);
- if (($row) && (!$this->isFullyLoaded())) {
- // If $row isn't a cached copy then increment the counter
- $this->attributes['tables_loaded']++;
- }
-
- // Now put these into the attributes array as core values
- $objarray = (array) $row;
- foreach ($objarray as $key => $value) {
- $this->attributes[$key] = $value;
+ $attrs = $attr_loader->getRequiredAttributes($guid);
+ if (!$attrs) {
+ return false;
}
- // guid needs to be an int http://trac.elgg.org/ticket/4111
- $this->attributes['guid'] = (int)$this->attributes['guid'];
+ $this->attributes = $attrs;
+ $this->attributes['tables_loaded'] = 2;
+ cache_entity($this);
return true;
}
* @throws InvalidClassException
*/
protected function load($guid) {
- // Load data from entity table if needed
- if (!parent::load($guid)) {
- return false;
- }
+ $attr_loader = new ElggAttributeLoader(get_class(), 'object', $this->attributes);
+ $attr_loader->requires_access_control = !($this instanceof ElggPlugin);
+ $attr_loader->secondary_loader = 'get_object_entity_as_row';
- // Only work with GUID from here
- if ($guid instanceof stdClass) {
- $guid = $guid->guid;
- }
-
- // Check the type
- if ($this->attributes['type'] != 'object') {
- $msg = elgg_echo('InvalidClassException:NotValidElggStar', array($guid, get_class()));
- throw new InvalidClassException($msg);
- }
-
- // Load missing data
- $row = get_object_entity_as_row($guid);
- if (($row) && (!$this->isFullyLoaded())) {
- // If $row isn't a cached copy then increment the counter
- $this->attributes['tables_loaded']++;
- }
-
- // Now put these into the attributes array as core values
- $objarray = (array) $row;
- foreach ($objarray as $key => $value) {
- $this->attributes[$key] = $value;
+ $attrs = $attr_loader->getRequiredAttributes($guid);
+ if (!$attrs) {
+ return false;
}
- // guid needs to be an int http://trac.elgg.org/ticket/4111
- $this->attributes['guid'] = (int)$this->attributes['guid'];
+ $this->attributes = $attrs;
+ $this->attributes['tables_loaded'] = 2;
+ cache_entity($this);
return true;
}
}
}
- /**
- * Overridden from ElggEntity and ElggObject::load(). Core always inits plugins with
- * a query joined to the objects_entity table, so all the info is there.
- *
- * @param mixed $guid GUID of an ElggObject or the stdClass object from entities table
- *
- * @return bool
- * @throws InvalidClassException
- */
- protected function load($guid) {
-
- $expected_attributes = $this->attributes;
- unset($expected_attributes['tables_split']);
- unset($expected_attributes['tables_loaded']);
-
- // this was loaded with a full join
- $needs_loaded = false;
-
- if ($guid instanceof stdClass) {
- $row = (array) $guid;
- $missing_attributes = array_diff_key($expected_attributes, $row);
- if ($missing_attributes) {
- $needs_loaded = true;
- $guid = $row['guid'];
- } else {
- $this->attributes = $row;
- }
- } else {
- $needs_loaded = true;
- }
-
- if ($needs_loaded) {
- $entity = (array) get_entity_as_row($guid);
- $object = (array) get_object_entity_as_row($guid);
-
- if (!$entity || !$object) {
- return false;
- }
-
- $this->attributes = array_merge($this->attributes, $entity, $object);
- }
-
- $this->attributes['tables_loaded'] = 2;
-
- // Check the type
- if ($this->attributes['type'] != 'object') {
- $msg = elgg_echo('InvalidClassException:NotValidElggStar', array($guid, get_class()));
- throw new InvalidClassException($msg);
- }
-
- // guid needs to be an int http://trac.elgg.org/ticket/4111
- $this->attributes['guid'] = (int)$this->attributes['guid'];
-
- cache_entity($this);
-
- return true;
- }
-
/**
* Save the plugin object. Make sure required values exist.
*
* @throws InvalidClassException
*/
protected function load($guid) {
- // Test to see if we have the generic stuff
- if (!parent::load($guid)) {
- return false;
- }
+ $attr_loader = new ElggAttributeLoader(get_class(), 'site', $this->attributes);
+ $attr_loader->requires_access_control = !($this instanceof ElggPlugin);
+ $attr_loader->secondary_loader = 'get_site_entity_as_row';
- // Only work with GUID from here
- if ($guid instanceof stdClass) {
- $guid = $guid->guid;
- }
-
- // Check the type
- if ($this->attributes['type'] != 'site') {
- $msg = elgg_echo('InvalidClassException:NotValidElggStar', array($guid, get_class()));
- throw new InvalidClassException($msg);
- }
-
- // Load missing data
- $row = get_site_entity_as_row($guid);
- if (($row) && (!$this->isFullyLoaded())) {
- // If $row isn't a cached copy then increment the counter
- $this->attributes['tables_loaded']++;
- }
-
- // Now put these into the attributes array as core values
- $objarray = (array) $row;
- foreach ($objarray as $key => $value) {
- $this->attributes[$key] = $value;
+ $attrs = $attr_loader->getRequiredAttributes($guid);
+ if (!$attrs) {
+ return false;
}
- // guid needs to be an int http://trac.elgg.org/ticket/4111
- $this->attributes['guid'] = (int)$this->attributes['guid'];
+ $this->attributes = $attrs;
+ $this->attributes['tables_loaded'] = 2;
+ cache_entity($this);
return true;
}
* @return bool
*/
protected function load($guid) {
- // Test to see if we have the generic stuff
- if (!parent::load($guid)) {
- return false;
- }
+ $attr_loader = new ElggAttributeLoader(get_class(), 'user', $this->attributes);
+ $attr_loader->secondary_loader = 'get_user_entity_as_row';
- // Only work with GUID from here
- if ($guid instanceof stdClass) {
- $guid = $guid->guid;
- }
-
- // Check the type
- if ($this->attributes['type'] != 'user') {
- $msg = elgg_echo('InvalidClassException:NotValidElggStar', array($guid, get_class()));
- throw new InvalidClassException($msg);
- }
-
- // Load missing data
- $row = get_user_entity_as_row($guid);
- if (($row) && (!$this->isFullyLoaded())) {
- // If $row isn't a cached copy then increment the counter
- $this->attributes['tables_loaded']++;
- }
-
- // Now put these into the attributes array as core values
- $objarray = (array) $row;
- foreach ($objarray as $key => $value) {
- $this->attributes[$key] = $value;
+ $attrs = $attr_loader->getRequiredAttributes($guid);
+ if (!$attrs) {
+ return false;
}
- // guid needs to be an int http://trac.elgg.org/ticket/4111
- $this->attributes['guid'] = (int)$this->attributes['guid'];
+ $this->attributes = $attrs;
+ $this->attributes['tables_loaded'] = 2;
+ cache_entity($this);
return true;
}
--- /dev/null
+<?php
+/**
+ * IncompleteEntityException
+ * Thrown when constructing an entity that is missing its secondary entity table
+ *
+ * @package Elgg.Core
+ * @subpackage Exception
+ * @access private
+ */
+class IncompleteEntityException extends Exception {}
}
}
- $new_entity = entity_row_to_elggstar($entity_row);
+ // don't let incomplete entities cause fatal exceptions
+ try {
+ $new_entity = entity_row_to_elggstar($entity_row);
+ } catch (IncompleteEntityException $e) {
+ return false;
+ }
+
if ($new_entity) {
cache_entity($new_entity);
}
$query .= " LIMIT $offset, $limit";
}
- $dt = get_data($query, $options['callback']);
+ if ($options['callback'] === 'entity_row_to_elggstar') {
+ $dt = _elgg_fetch_entities_from_sql($query);
+ } else {
+ $dt = get_data($query, $options['callback']);
+ }
+
if ($dt) {
// populate entity and metadata caches
$guids = array();
}
}
+/**
+ * Return entities from an SQL query generated by elgg_get_entities.
+ *
+ * @param string $sql
+ * @return ElggEntity[]
+ *
+ * @access private
+ * @throws LogicException
+ */
+function _elgg_fetch_entities_from_sql($sql) {
+ static $plugin_subtype;
+ if (null === $plugin_subtype) {
+ $plugin_subtype = get_subtype_id('object', 'plugin');
+ }
+
+ // Keys are types, values are columns that, if present, suggest that the secondary
+ // table is already JOINed
+ $types_to_optimize = array(
+ 'object' => 'title',
+ 'user' => 'password',
+ 'group' => 'name',
+ );
+
+ $rows = get_data($sql);
+
+ // guids to look up in each type
+ $lookup_types = array();
+ // maps GUIDs to the $rows key
+ $guid_to_key = array();
+
+ if (isset($rows[0]->type, $rows[0]->subtype)
+ && $rows[0]->type === 'object'
+ && $rows[0]->subtype == $plugin_subtype) {
+ // Likely the entire resultset is plugins, which have already been optimized
+ // to JOIN the secondary table. In this case we allow retrieving from cache,
+ // but abandon the extra queries.
+ $types_to_optimize = array();
+ }
+
+ // First pass: use cache where possible, gather GUIDs that we're optimizing
+ foreach ($rows as $i => $row) {
+ if (empty($row->guid) || empty($row->type)) {
+ throw new LogicException('Entity row missing guid or type');
+ }
+ if ($entity = retrieve_cached_entity($row->guid)) {
+ $rows[$i] = $entity;
+ continue;
+ }
+ if (isset($types_to_optimize[$row->type])) {
+ // check if row already looks JOINed.
+ if (isset($row->{$types_to_optimize[$row->type]})) {
+ // Row probably already contains JOINed secondary table. Don't make another query just
+ // to pull data that's already there
+ continue;
+ }
+ $lookup_types[$row->type][] = $row->guid;
+ $guid_to_key[$row->guid] = $i;
+ }
+ }
+ // Do secondary queries and merge rows
+ if ($lookup_types) {
+ $dbprefix = elgg_get_config('dbprefix');
+ }
+ foreach ($lookup_types as $type => $guids) {
+ $set = "(" . implode(',', $guids) . ")";
+ $sql = "SELECT * FROM {$dbprefix}{$type}s_entity WHERE guid IN $set";
+ $secondary_rows = get_data($sql);
+ if ($secondary_rows) {
+ foreach ($secondary_rows as $secondary_row) {
+ $key = $guid_to_key[$secondary_row->guid];
+ // cast to arrays to merge then cast back
+ $rows[$key] = (object)array_merge((array)$rows[$key], (array)$secondary_row);
+ }
+ }
+ }
+ // Second pass to finish conversion
+ foreach ($rows as $i => $row) {
+ if ($row instanceof ElggEntity) {
+ continue;
+ } else {
+ try {
+ $rows[$i] = entity_row_to_elggstar($row);
+ } catch (IncompleteEntityException $e) {
+ // don't let incomplete entities throw fatal errors
+ unset($rows[$i]);
+ }
+ }
+ }
+ return $rows;
+}
+
/**
* Returns SQL where clause for type and subtype on main entity table
*
'type' => 'object',
'subtype' => 'plugin',
'joins' => array("JOIN {$db_prefix}objects_entity oe on oe.guid = e.guid"),
+ 'selects' => array("oe.title", "oe.description"),
'wheres' => array("oe.title = '$plugin_id'"),
'limit' => 1
);
projects / lorea / elgg.git / commitdiff