<?php

namespace ActivityPub\JsonLd;

use ActivityPub\Utils\UuidProvider;
use InvalidArgumentException;
use Ramsey\Uuid\Uuid;

/**
 * A view of a JSON-LD graph. Maps ids to JsonLdNode instances.
 * Class JsonLdGraph
 * @package ActivityPub\JsonLd
 */
class JsonLdGraph
{
    /** @var array */
    private $graph;

    /** @var UuidProvider */
    private $uuidProvider;

    public function __construct(UuidProvider $uuidProvider)
    {
        $this->graph = array();
        $this->uuidProvider = $uuidProvider;
    }

    public function addNode(JsonLdNode $node)
    {
        $id = $node->getId();
        if ( is_null( $id ) ) {
            $id = $this->uuidProvider->uuid();
            $node->setId( $id );
        }
        $this->graph[$id] = $node;
    }

    public function getNode($id)
    {
        if ( array_key_exists( $id, $this->graph ) ) {
            return $this->graph[$id];
        }
    }

    public function nameBlankNode($blankNodeName, $newNodeName)
    {
        if ( array_key_exists( $newNodeName, $this->graph ) ) {
            throw new InvalidArgumentException( "$newNodeName is already defined." );
        }
        if ( ! array_key_exists( $blankNodeName, $this->graph ) ) {
            throw new InvalidArgumentException( "$blankNodeName is not in the graph." );
        }
        $this->graph[$newNodeName] = $this->graph[$blankNodeName];
        unset( $this->graph[$blankNodeName] );
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NjU3NjU5MDY2MjMxMTE0NCAxMjkzMTU0OTE3MTQ3MTYwIDM5MDg0ODE2NjIwMjc4NDY=