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<?php
abstract class ElggData implements
Iterator, // Override foreach behaviour
ArrayAccess // Override for array access
{
/**
* 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;
/*
* 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);
}
}
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