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Diffstat (limited to 'engine/classes/ElggData.php')
| -rw-r--r-- | engine/classes/ElggData.php | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/engine/classes/ElggData.php b/engine/classes/ElggData.php new file mode 100644 index 000000000..3470ee1cf --- /dev/null +++ b/engine/classes/ElggData.php @@ -0,0 +1,305 @@ +<?php +/** + * A generic class that contains shared code b/w + * ElggExtender, ElggEntity, and ElggRelationship + * + * @package Elgg.Core + * @subpackage DataModel + */ +abstract class ElggData implements + Loggable, // Can events related to this object class be logged + Iterator, // Override foreach behaviour + ArrayAccess, // Override for array access + Exportable +{ + + /** + * The main attributes of an entity. + * Holds attributes to save to database + * This contains the site's main properties (id, etc) + * Blank entries for all database fields should be created by the constructor. + * Subclasses should add to this in their constructors. + * Any field not appearing in this will be viewed as a + */ + protected $attributes = array(); + + /** + * Initialise the attributes array. + * + * This is vital to distinguish between metadata and base parameters. + * + * @param bool $pre18_api Compatibility for subclassing in 1.7 -> 1.8 change. + * Passing true (default) emits a deprecation notice. + * Passing false returns false. Core constructors always pass false. + * Does nothing either way since attributes are initialized by the time + * this is called. + * @return false|void False is + * @deprecated 1.8 Use initializeAttributes() + */ + protected function initialise_attributes($pre18_api = true) { + if ($pre18_api) { + elgg_deprecated_notice('initialise_attributes() is deprecated by initializeAttributes()', 1.8); + } else { + return false; + } + } + + /** + * Initialize the attributes array. + * + * This is vital to distinguish between metadata and base parameters. + * + * @return void + */ + protected function initializeAttributes() { + // Create attributes array if not already created + if (!is_array($this->attributes)) { + $this->attributes = array(); + } + + $this->attributes['time_created'] = NULL; + } + + /** + * Return an attribute or a piece of metadata. + * + * @param string $name Name + * + * @return mixed + */ + public function __get($name) { + return $this->get($name); + } + + /** + * Set an attribute or a piece of metadata. + * + * @param string $name Name + * @param mixed $value Value + * + * @return mixed + */ + public function __set($name, $value) { + return $this->set($name, $value); + } + + /** + * Test if property is set either as an attribute or metadata. + * + * @tip Use isset($entity->property) + * + * @param string $name The name of the attribute or metadata. + * + * @return bool + */ + function __isset($name) { + return $this->$name !== NULL; + } + + /** + * Fetch the specified attribute + * + * @param string $name The attribute to fetch + * + * @return mixed The attribute, if it exists. Otherwise, null. + */ + abstract protected function get($name); + + /** + * Set the specified attribute + * + * @param string $name The attribute to set + * @param mixed $value The value to set it to + * + * @return The success of your set funtion? + */ + abstract protected function set($name, $value); + + /** + * Get a URL for this object + * + * @return string + */ + abstract public function getURL(); + + /** + * Save this data to the appropriate database table. + * + * @return bool + */ + abstract public function save(); + + /** + * Delete this data. + * + * @return bool + */ + abstract public function delete(); + + /** + * Returns the UNIX epoch time that this entity was created + * + * @return int UNIX epoch time + */ + public function getTimeCreated() { + return $this->time_created; + } + + /* + * SYSTEM LOG INTERFACE + */ + + /** + * Return the class name of the object. + * + * @return string + */ + public function getClassName() { + return get_class($this); + } + + /** + * Return the GUID of the owner of this object. + * + * @return int + * @deprecated 1.8 Use getOwnerGUID() instead + */ + public function getObjectOwnerGUID() { + elgg_deprecated_notice("getObjectOwnerGUID() was deprecated. Use getOwnerGUID().", 1.8); + return $this->owner_guid; + } + + /* + * 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 + */ + protected $valid = FALSE; + + /** + * Iterator interface + * + * @see Iterator::rewind() + * + * @return void + */ + public function rewind() { + $this->valid = (FALSE !== reset($this->attributes)); + } + + /** + * Iterator interface + * + * @see Iterator::current() + * + * @return void + */ + public function current() { + return current($this->attributes); + } + + /** + * Iterator interface + * + * @see Iterator::key() + * + * @return void + */ + public function key() { + return key($this->attributes); + } + + /** + * Iterator interface + * + * @see Iterator::next() + * + * @return void + */ + public function next() { + $this->valid = (FALSE !== next($this->attributes)); + } + + /** + * Iterator interface + * + * @see Iterator::valid() + * + * @return void + */ + public 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 + */ + + /** + * Array access interface + * + * @see ArrayAccess::offsetSet() + * + * @param mixed $key Name + * @param mixed $value Value + * + * @return void + */ + public function offsetSet($key, $value) { + if (array_key_exists($key, $this->attributes)) { + $this->attributes[$key] = $value; + } + } + + /** + * Array access interface + * + * @see ArrayAccess::offsetGet() + * + * @param mixed $key Name + * + * @return void + */ + public function offsetGet($key) { + if (array_key_exists($key, $this->attributes)) { + return $this->attributes[$key]; + } + } + + /** + * Array access interface + * + * @see ArrayAccess::offsetUnset() + * + * @param mixed $key Name + * + * @return void + */ + public function offsetUnset($key) { + if (array_key_exists($key, $this->attributes)) { + // Full unsetting is dangerous for our objects + $this->attributes[$key] = ""; + } + } + + /** + * Array access interface + * + * @see ArrayAccess::offsetExists() + * + * @param int $offset Offset + * + * @return int + */ + public function offsetExists($offset) { + return array_key_exists($offset, $this->attributes); + } +} |