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<?php
namespace Icinga\Module\Director\Objects;
use Icinga\Exception\ProgrammingError;
use Icinga\Module\Director\Objects\IcingaObject;
/**
* Related Object
*
* This class comes in handy when working with simple foreign key references. In
* contrast to an ORM it helps to deal with lazy-loaded objects in a way allowing
* us to render objects with references which to no longer (or not yet) exist
*/
class IcingaRelatedObject
{
/** @var IcingaObject Main object with (optional) relation */
protected $owner;
/** @var int Related object id */
protected $id;
/** @var int Related object name */
protected $name;
/** @var int Relation property name, e.g. 'host' */
protected $key;
/** @var int Relation property, e.g. 'host_id' */
protected $idKey;
/** @var IcingaObject Related object once loaded */
protected $object;
/** @var string Related class name */
protected $className;
/**
* IcingaRelatedObject constructor
*
* @param IcingaObject $owner Main object referring a related one
* @param string $key Main objects (short) property name for this
*/
public function __construct(IcingaObject $owner, $key)
{
$this->owner = $owner;
$this->key = $key;
$this->idKey = $key . '_id';
}
/**
* Set a specific id
*
* @param $id int
*
* @return self
*/
public function setId($id)
{
if (! is_int($id)) {
throw new ProgrammingError(
'An id must be an integer'
);
}
if ($this->object !== null) {
if ($this->object->id === $id) {
return $this;
} else {
$this->object = null;
}
}
if ($this->object === null) {
$this->name = null;
}
$this->id = $id;
$this->owner->set($this->getRealPropertyName(), $id);
return $this;
}
/**
* Return the related objects id
*
* @return int
*/
public function getId()
{
if ($this->id === null) {
$this->id = $this->getObject()->id;
}
return $this->id;
}
/**
* Lazy-load the related object
*
* @return IcingaObject
*/
public function getObject()
{
// TODO: This is unfinished
if ($this->object === null) {
$class = $this->getClassName();
if ($this->name === null) {
if ($id = $this->getId()) {
}
} else {
$this->object = $class::load($this->name, $this->owner->getConnection());
}
}
return $this->object;
}
/**
* The real property name pointing to this relation, e.g. 'host_id'
*
* @return string
*/
public function getRealPropertyName()
{
return $this->key . '_id';
}
/**
* Full related class name
*
* @return string
*/
public function getClassName()
{
if ($this->className === null) {
$this->className = __NAMESPACE__ . '\\' . $this->getShortClassName();
}
return $this->className;
}
/**
* Related class name relative to Icinga\Module\Director\Objects
*
* @return string
*/
public function getShortClassName()
{
return $this->owner->getRelationObjectClass($this->key);
}
/**
* Set a related property
*
* This might be a string or an object
* @param $related string|IcingaObject
* @throws ProgrammingError
*
* return self
*/
public function set($related)
{
if (is_string($related)) {
$this->name = $related;
} elseif (is_object($related)) {
$className = $this->getClassName();
if ($related instanceof $className) {
$this->object = $related;
$this->name = $object->object_name;
$this->id = $object->id;
} else {
throw new ProgrammingError(
'Trying to set a related "%s" while expecting "%s"',
get_class($related),
$this->getShortClassName()
);
}
} else {
throw new ProgrammingError(
'Related object can be name or object, got: %s',
var_export($related, true)
);
}
return $this;
}
/**
* Get the name of the related object
*
* @return string
*/
public function getName()
{
if ($this->name === null) {
return $this->owner->{$this->key};
} else {
return $this->name;
}
}
/**
* Conservative constructor to avoid issued with PHP GC
*/
public function __destruct()
{
unset($this->owner);
}
}
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