diff options
Diffstat (limited to 'engine/classes/ElggRelationship.php')
| -rw-r--r-- | engine/classes/ElggRelationship.php | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/engine/classes/ElggRelationship.php b/engine/classes/ElggRelationship.php new file mode 100644 index 000000000..4d14941a9 --- /dev/null +++ b/engine/classes/ElggRelationship.php @@ -0,0 +1,287 @@ +<?php
+
+/**
+ * Relationship class.
+ *
+ * @author Curverider Ltd
+ * @package Elgg
+ * @subpackage Core
+ */
+class ElggRelationship implements
+ Importable,
+ Exportable,
+ Loggable, // Can events related to this object class be logged
+ Iterator, // Override foreach behaviour
+ ArrayAccess // Override for array access
+ {
+ /**
+ * This contains the site's main properties (id, etc)
+ * @var array
+ */
+ protected $attributes;
+
+ /**
+ * Construct a new site object, optionally from a given id value or row.
+ *
+ * @param mixed $id
+ */
+ function __construct($id = null) {
+ $this->attributes = array();
+
+ if (!empty($id)) {
+ if ($id instanceof stdClass) {
+ $relationship = $id; // Create from db row
+ } else {
+ $relationship = get_relationship($id);
+ }
+
+ if ($relationship) {
+ $objarray = (array) $relationship;
+ foreach($objarray as $key => $value) {
+ $this->attributes[$key] = $value;
+ }
+ }
+ }
+ }
+
+ /**
+ * Class member get overloading
+ *
+ * @param string $name
+ * @return mixed
+ */
+ function __get($name) {
+ if (isset($this->attributes[$name])) {
+ return $this->attributes[$name];
+ }
+
+ return null;
+ }
+
+ /**
+ * Class member set overloading
+ *
+ * @param string $name
+ * @param mixed $value
+ * @return mixed
+ */
+ function __set($name, $value) {
+ $this->attributes[$name] = $value;
+ return true;
+ }
+
+ /**
+ * Save the relationship
+ *
+ * @return int the relationship id
+ */
+ public function save() {
+ if ($this->id > 0) {
+ delete_relationship($this->id);
+ }
+
+ $this->id = add_entity_relationship($this->guid_one, $this->relationship, $this->guid_two);
+ if (!$this->id) {
+ throw new IOException(sprintf(elgg_echo('IOException:UnableToSaveNew'), get_class()));
+ }
+
+ return $this->id;
+ }
+
+ /**
+ * Delete a given relationship.
+ */
+ public function delete() {
+ return delete_relationship($this->id);
+ }
+
+ /**
+ * Get a URL for this relationship.
+ *
+ * @return string
+ */
+ public function getURL() {
+ return get_relationship_url($this->id);
+ }
+
+ // EXPORTABLE INTERFACE ////////////////////////////////////////////////////////////
+
+ /**
+ * Return an array of fields which can be exported.
+ */
+ public function getExportableValues() {
+ return array(
+ 'id',
+ 'guid_one',
+ 'relationship',
+ 'guid_two'
+ );
+ }
+
+ /**
+ * Export this relationship
+ *
+ * @return array
+ */
+ public function export() {
+ $uuid = get_uuid_from_object($this);
+ $relationship = new ODDRelationship(
+ guid_to_uuid($this->guid_one),
+ $this->relationship,
+ guid_to_uuid($this->guid_two)
+ );
+
+ $relationship->setAttribute('uuid', $uuid);
+
+ return $relationship;
+ }
+
+ // IMPORTABLE INTERFACE ////////////////////////////////////////////////////////////
+
+ /**
+ * Import a relationship
+ *
+ * @param array $data
+ * @param int $version
+ * @return ElggRelationship
+ * @throws ImportException
+ */
+ public function import(ODD $data) {
+ if (!($element instanceof ODDRelationship)) {
+ throw new InvalidParameterException(elgg_echo('InvalidParameterException:UnexpectedODDClass'));
+ }
+
+ $uuid_one = $data->getAttribute('uuid1');
+ $uuid_two = $data->getAttribute('uuid2');
+
+ // See if this entity has already been imported, if so then we need to link to it
+ $entity1 = get_entity_from_uuid($uuid_one);
+ $entity2 = get_entity_from_uuid($uuid_two);
+ if (($entity1) && ($entity2)) {
+ // Set the item ID
+ $this->attributes['guid_one'] = $entity1->getGUID();
+ $this->attributes['guid_two'] = $entity2->getGUID();
+
+ // Map verb to relationship
+ //$verb = $data->getAttribute('verb');
+ //$relationship = get_relationship_from_verb($verb);
+ $relationship = $data->getAttribute('type');
+
+ if ($relationship) {
+ $this->attributes['relationship'] = $relationship;
+ // save
+ $result = $this->save();
+ if (!$result) {
+ throw new ImportException(sprintf(elgg_echo('ImportException:ProblemSaving'), get_class()));
+ }
+
+ return $this;
+ }
+ }
+ }
+
+ // SYSTEM LOG INTERFACE ////////////////////////////////////////////////////////////
+
+ /**
+ * Return an identification for the object for storage in the system log.
+ * This id must be an integer.
+ *
+ * @return int
+ */
+ public function getSystemLogID() {
+ return $this->id;
+ }
+
+ /**
+ * Return the class name of the object.
+ */
+ public function getClassName() {
+ return get_class($this);
+ }
+
+ /**
+ * For a given ID, return the object associated with it.
+ * This is used by the river functionality primarily.
+ * This is useful for checking access permissions etc on objects.
+ */
+ public function getObjectFromID($id) {
+ return get_relationship($id);
+ }
+
+ /**
+ * Return the GUID of the owner of this object.
+ */
+ public function getObjectOwnerGUID() {
+ return $this->owner_guid;
+ }
+
+ /**
+ * Return a type of the object - eg. object, group, user, relationship, metadata, annotation etc
+ */
+ public function getType() {
+ return 'relationship';
+ }
+
+ /**
+ * Return a subtype. For metadata & annotations this is the 'name' and for relationship this is the relationship type.
+ */
+ public function getSubtype() {
+ return $this->relationship;
+ }
+
+ // ITERATOR INTERFACE //////////////////////////////////////////////////////////////
+ /*
+ * This lets an entity's attributes be displayed using foreach as a normal array.
+ * Example: http://www.sitepoint.com/print/php5-standard-library
+ */
+
+ private $valid = FALSE;
+
+ function rewind() {
+ $this->valid = (FALSE !== reset($this->attributes));
+ }
+
+ function current() {
+ return current($this->attributes);
+ }
+
+ function key() {
+ return key($this->attributes);
+ }
+
+ function next() {
+ $this->valid = (FALSE !== next($this->attributes));
+ }
+
+ function valid() {
+ return $this->valid;
+ }
+
+ // ARRAY ACCESS INTERFACE //////////////////////////////////////////////////////////
+ /*
+ * This lets an entity's attributes be accessed like an associative array.
+ * Example: http://www.sitepoint.com/print/php5-standard-library
+ */
+
+ function offsetSet($key, $value) {
+ if ( array_key_exists($key, $this->attributes) ) {
+ $this->attributes[$key] = $value;
+ }
+ }
+
+ function offsetGet($key) {
+ if ( array_key_exists($key, $this->attributes) ) {
+ return $this->attributes[$key];
+ }
+ }
+
+ function offsetUnset($key) {
+ if ( array_key_exists($key, $this->attributes) ) {
+ $this->attributes[$key] = ""; // Full unsetting is dangerious for our objects
+ }
+ }
+
+ function offsetExists($offset) {
+ return array_key_exists($offset, $this->attributes);
+ }
+}
\ No newline at end of file |