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<?php
namespace Icinga\Module\Businessprocess\Modification;
use Icinga\Module\Businessprocess\BpConfig;
use Icinga\Module\Businessprocess\Exception\ModificationError;
use Icinga\Module\Businessprocess\Node;
use Icinga\Exception\ProgrammingError;
/**
* Abstract NodeAction class
*
* Every instance of a NodeAction represents a single applied change. Changes are pushed to
* a stack and consumed from there. When persisted, NodeActions are serialized with their name,
* node name and optionally additional properties according preserveProperties. For each property
* that should be preserved, getter and setter methods have to be defined.
*
* @package Icinga\Module\Businessprocess
*/
abstract class NodeAction
{
/** @var string Name of this action (currently create, modify, remove) */
protected $actionName;
/** @var string Name of the node this action applies to */
protected $nodeName;
/** @var array Properties which should be preserved when serializing this action */
protected $preserveProperties = array();
/**
* NodeAction constructor.
*
* @param Node|string $node
*/
public function __construct($node = null)
{
if ($node !== null) {
$this->nodeName = (string) $node;
}
}
/**
* Every NodeAction must be able to apply itself to a BusinessProcess
*
* @param BpConfig $config
* @return mixed
*/
abstract public function applyTo(BpConfig $config);
/**
* Every NodeAction must be able to tell whether it can be applied to a BusinessProcess
*
* @param BpConfig $config
*
* @throws ModificationError
*
* @return bool
*/
abstract public function appliesTo(BpConfig $config);
/**
* The name of the node this modification applies to
*
* @return string
*/
public function getNodeName()
{
return $this->nodeName;
}
public function hasNode()
{
return $this->nodeName !== null;
}
/**
* Whether this is an instance of a given action name
*
* @param string $actionName
* @return bool
*/
public function is($actionName)
{
return $this->getActionName() === $actionName;
}
/**
* Throw a ModificationError
*
* @param string $msg
* @param mixed ...
*
* @throws ModificationError
*/
protected function error($msg)
{
$error = ModificationError::create(func_get_args());
/** @var ModificationError $error */
throw $error;
}
/**
* Create an instance of a given actionName for a specific Node
*
* @param string $actionName
* @param string $nodeName
*
* @return static
*/
public static function create($actionName, $nodeName)
{
$className = __NAMESPACE__ . '\\Node' . ucfirst($actionName) . 'Action';
return new $className($nodeName);
}
/**
* Returns a JSON-encoded serialized NodeAction
*
* @return string
*/
public function serialize()
{
$object = (object) array(
'actionName' => $this->getActionName(),
'nodeName' => $this->getNodeName(),
'properties' => array()
);
foreach ($this->preserveProperties as $key) {
$func = 'get' . ucfirst($key);
$object->properties[$key] = $this->$func();
}
return json_encode($object);
}
/**
* Decodes a JSON-serialized NodeAction and returns an object instance
*
* @param $string
* @return NodeAction
*/
public static function unSerialize($string)
{
$object = json_decode($string, true);
$action = self::create($object['actionName'], $object['nodeName']);
foreach ($object['properties'] as $key => $val) {
$func = 'set' . ucfirst($key);
$action->$func($val);
}
return $action;
}
/**
* Returns the defined action name or determines such from the class name
*
* @return string The action name
*
* @throws ProgrammingError when no such class exists
*/
public function getActionName()
{
if ($this->actionName === null) {
if (! preg_match('/\\\Node(\w+)Action$/', get_class($this), $m)) {
throw new ProgrammingError(
'"%s" is not a NodeAction class',
get_class($this)
);
}
$this->actionName = lcfirst($m[1]);
}
return $this->actionName;
}
}
|
