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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection\Compiler;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
/**
* This is a directed graph of your services.
*
* This information can be used by your compiler passes instead of collecting
* it themselves which improves performance quite a lot.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
class ServiceReferenceGraph
{
/**
* @var ServiceReferenceGraphNode[]
*/
private $nodes = array();
/**
* Checks if the graph has a specific node.
*
* @param string $id Id to check
*
* @return bool
*/
public function hasNode($id)
{
return isset($this->nodes[$id]);
}
/**
* Gets a node by identifier.
*
* @param string $id The id to retrieve
*
* @return ServiceReferenceGraphNode The node matching the supplied identifier
*
* @throws InvalidArgumentException if no node matches the supplied identifier
*/
public function getNode($id)
{
if (!isset($this->nodes[$id])) {
throw new InvalidArgumentException(sprintf('There is no node with id "%s".', $id));
}
return $this->nodes[$id];
}
/**
* Returns all nodes.
*
* @return ServiceReferenceGraphNode[] An array of all ServiceReferenceGraphNode objects
*/
public function getNodes()
{
return $this->nodes;
}
/**
* Clears all nodes.
*/
public function clear()
{
$this->nodes = array();
}
/**
* Connects 2 nodes together in the Graph.
*
* @param string $sourceId
* @param string $sourceValue
* @param string $destId
* @param string $destValue
* @param string $reference
*/
public function connect($sourceId, $sourceValue, $destId, $destValue = null, $reference = null)
{
$sourceNode = $this->createNode($sourceId, $sourceValue);
$destNode = $this->createNode($destId, $destValue);
$edge = new ServiceReferenceGraphEdge($sourceNode, $destNode, $reference);
$sourceNode->addOutEdge($edge);
$destNode->addInEdge($edge);
}
/**
* Creates a graph node.
*
* @param string $id
* @param string $value
*
* @return ServiceReferenceGraphNode
*/
private function createNode($id, $value)
{
if (isset($this->nodes[$id]) && $this->nodes[$id]->getValue() === $value) {
return $this->nodes[$id];
}
return $this->nodes[$id] = new ServiceReferenceGraphNode($id, $value);
}
}
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