<?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\Definition;

use Symfony\Component\DependencyInjection\Alias;

/**

 * Represents a node in your service graph.

 *

 * Value is typically a definition, or an alias.

 *

 * @author Johannes M. Schmitt <schmittjoh@gmail.com>

 */

class ServiceReferenceGraphNode

{

    private $id;

    private $inEdges;

    private $outEdges;

    private $value;

    /**

     * Constructor.

     *

     * @param string $id The node identifier

     * @param mixed $value The node value

     */

    public function __construct($id, $value)

    {

        $this->id = $id;

        $this->value = $value;

        $this->inEdges = array();

        $this->outEdges = array();

    }

    /**

     * Adds an in edge to this node.

     *

     * @param ServiceReferenceGraphEdge $edge

     */

    public function addInEdge(ServiceReferenceGraphEdge $edge)

    {

        $this->inEdges[] = $edge;

    }

    /**

     * Adds an out edge to this node.

     *

     * @param ServiceReferenceGraphEdge $edge

     */

    public function addOutEdge(ServiceReferenceGraphEdge $edge)

    {

        $this->outEdges[] = $edge;

    }

    /**

     * Checks if the value of this node is an Alias.

     *

     * @return Boolean True if the value is an Alias instance

     */

    public function isAlias()

    {

        return $this->value instanceof Alias;

    }

    /**

     * Checks if the value of this node is a Definition.

     *

     * @return Boolean True if the value is a Definition instance

     */

    public function isDefinition()

    {

        return $this->value instanceof Definition;

    }

    /**

     * Returns the identifier.

     *

     * @return string

     */

    public function getId()

    {

        return $this->id;

    }

    /**

     * Returns the in edges.

     *

     * @return array The in ServiceReferenceGraphEdge array

     */

    public function getInEdges()

    {

        return $this->inEdges;

    }

    /**

     * Returns the out edges.

     *

     * @return array The out ServiceReferenceGraphEdge array

     */

    public function getOutEdges()

    {

        return $this->outEdges;

    }

    /**

     * Returns the value of this Node

     *

     * @return mixed The value

     */

    public function getValue()

    {

        return $this->value;

    }

}