Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
154 lines (139 sloc) 3.64 KB
<?php declare(strict_types=1);
/*
* This file is part of the Pho package.
*
* (c) Emre Sokullu <emre@phonetworks.org>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Pho\Lib\Graph;
/**
* Atomic graph entity, Node
*
* A graph is made up of nodes (aka. nodes, or points) which are connected by
* edges (aka arcs, or lines) therefore node is the fundamental unit of
* which graphs are formed.
*
* Nodes are indivisible, yet they share some common characteristics with edges.
* In Pho context, these commonalities are represented with the EntityInterface.
*
* Uses Observer Pattern to observe updates from its attribute bags.
*
* Last but not least, this class is declared \Serializable. While it does nothing
* special within this class, this declaration may be useful for subclasses to override
* and persist data.
*
* @see EdgeList
*
* @author Emre Sokullu <emre@phonetworks.org>
*/
class Node implements
EntityInterface,
EntityWorkerInterface,
NodeInterface,
NodeWorkerInterface,
HookableInterface,
\Serializable,
Event\EmitterInterface
{
use SerializableTrait;
use EntityTrait {
EntityTrait::__construct as ____construct;
}
use HookableTrait;
use Event\EmitterTrait;
/**
* Internal variable that keeps track of edges in and out.
*
* @var EdgeList
*/
protected $edge_list;
/**
* The graph context of this node
*
* @var GraphInterface
*/
protected $context;
/**
* The ID of the graph context of this node
*
* @var string
*/
protected $context_id;
/**
* {@inheritdoc}
*/
public function __construct(GraphInterface $context)
{
$this->____construct();
$this->edge_list = new EdgeList($this);
$context->add($this)->context = $context;
$this->context_id = (string) $context->id();
//$this->attachGraphObservers($context);
$this->init();
Logger::info("A node with id \"%s\" and label \"%s\" constructed", $this->id(), $this->label());
}
/**
* Adds the context itself and the context's contexts (if available)
* recursively to the list of observers for deletion.
*
* @param GraphInterface $context
*
* @return void
*/
/*private function attachGraphObservers(GraphInterface $context): void
{
while($context instanceof SubGraph) {
$this->attach($context);
$context = $context->context();
}
$this->attach($context);
}
*/
/**
* {@inheritdoc}
*/
public function context(): GraphInterface
{
if(isset($this->context)) {
return $this->context;
}
return $this->hookable();
}
/**
* {@inheritdoc}
*/
public function changeContext(GraphInterface $context): void
{
$this->context()->remove($this->id());
$this->context = $context;
$this->context_id = $context->id();
$this->context->add($this);
$this->emit("modified");
}
/**
* {@inheritdoc}
*/
public function edges(): EdgeList
{
return $this->edge_list;
}
/**
* {@inheritdoc}
*/
public function toArray(): array
{
$array = $this->entityToArray();
$array["edge_list"] = $this->edge_list->toArray();
$array["context"] = (string) $this->context_id;
return $array;
}
/**
* {@inheritDoc}
*/
public function edge(string $id): EdgeInterface
{
return $this->hookable();
}
}
You can’t perform that action at this time.