<?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:----MzU0NTU3OTEzNDg4NDY4MSAyNTYwNjYzNDQxODY2NDU2IDEzNzE1MDc3NjIxNjYyNjE=