<?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:----OTAwNDkxODE1ODk2NjYyOCAxODgzMjYxNzg0NjYwMjA4IDg3NzA2OTQ1NzczMDc0NDQ=