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- 06.01.2017
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ServiceReferenceGraph.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\DependencyInjection\Compiler;
013
014 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
015
016 /**
017 * This is a directed graph of your services.
018 *
019 * This information can be used by your compiler passes instead of collecting
020 * it themselves which improves performance quite a lot.
021 *
022 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
023 */
024 class ServiceReferenceGraph
025 {
026 /**
027 * @var ServiceReferenceGraphNode[]
028 */
029 private $nodes = array();
030
031 /**
032 * Checks if the graph has a specific node.
033 *
034 * @param string $id Id to check
035 *
036 * @return bool
037 */
038 public function hasNode($id)
039 {
040 return isset($this->nodes[$id]);
041 }
042
043 /**
044 * Gets a node by identifier.
045 *
046 * @param string $id The id to retrieve
047 *
048 * @return ServiceReferenceGraphNode The node matching the supplied identifier
049 *
050 * @throws InvalidArgumentException if no node matches the supplied identifier
051 */
052 public function getNode($id)
053 {
054 if (!isset($this->nodes[$id])) {
055 throw new InvalidArgumentException(sprintf('There is no node with id "%s".', $id));
056 }
057
058 return $this->nodes[$id];
059 }
060
061 /**
062 * Returns all nodes.
063 *
064 * @return ServiceReferenceGraphNode[] An array of all ServiceReferenceGraphNode objects
065 */
066 public function getNodes()
067 {
068 return $this->nodes;
069 }
070
071 /**
072 * Clears all nodes.
073 */
074 public function clear()
075 {
076 $this->nodes = array();
077 }
078
079 /**
080 * Connects 2 nodes together in the Graph.
081 *
082 * @param string $sourceId
083 * @param string $sourceValue
084 * @param string $destId
085 * @param string $destValue
086 * @param string $reference
087 */
088 public function connect($sourceId, $sourceValue, $destId, $destValue = null, $reference = null)
089 {
090 $sourceNode = $this->createNode($sourceId, $sourceValue);
091 $destNode = $this->createNode($destId, $destValue);
092 $edge = new ServiceReferenceGraphEdge($sourceNode, $destNode, $reference);
093
094 $sourceNode->addOutEdge($edge);
095 $destNode->addInEdge($edge);
096 }
097
098 /**
099 * Creates a graph node.
100 *
101 * @param string $id
102 * @param string $value
103 *
104 * @return ServiceReferenceGraphNode
105 */
106 private function createNode($id, $value)
107 {
108 if (isset($this->nodes[$id]) && $this->nodes[$id]->getValue() === $value) {
109 return $this->nodes[$id];
110 }
111
112 return $this->nodes[$id] = new ServiceReferenceGraphNode($id, $value);
113 }
114 }
115