<?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:----MTcxODM4NTAyMzkxMTg5NiA1NDk1NTc0NjQ2MzA3Nzk4IDY5Mzk0MzcyMTY4MTAyMjk=