<?php

/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2017 (original work) Open Assessment Technologies SA
 *
 */

namespace oat\taoQtiItem\model\qti\metadata\ontology;

use oat\taoQtiItem\model\qti\metadata\LomMetadata;

class OntologyMetadataRules
{
    /**
     * @var LomMetadata[]
     */
    protected $rules = [];

    protected function addRule(LomMetadata $rule)
    {
        $pathKey = $this->transformPath($rule->getPath());
        if (! $this->hasRule($pathKey)) {
            $this->rules[$pathKey] = [];
        }

        $this->rules[$pathKey][] = $rule;
    }

    protected function hasRule($path)
    {
        return isset($this->rules[$this->transformPath($path)]);
    }

    protected function serializePath(array $path)
    {
        return implode('->', $path);
    }

    protected function transformPath($path)
    {
        if (is_array($path)) {
            $path = $this->serializePath($path);
        }
        return $path;
    }
}