<?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:----ODY4MDIwODE2ODU2OTY4OSA4NjA1Nzg2MDM5NzE5NzggNDEyODc5NDgwNzQ0MTMwNw==