<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2022 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\ORM\Value;

use Espo\ORM\{
    Entity,
    Value\GeneralValueFactory,
    Value\GeneralAttributeExtractor,
};

class ValueAccessor
{
    private $entity;

    private $valueFactory;

    private $extractor;

    public function __construct(
        Entity $entity,
        GeneralValueFactory $valueFactory,
        GeneralAttributeExtractor $extractor
    ) {
        $this->entity = $entity;
        $this->valueFactory = $valueFactory;
        $this->extractor = $extractor;
    }

    /**
     * Get a field value object.
     */
    public function get(string $field): ?object
    {
        if (!$this->isGettable($field)) {
            return null;
        }

        return $this->valueFactory->createFromEntity($this->entity, $field);
    }

    /**
     * Whether a field value object can be gotten.
     */
    public function isGettable(string $field): bool
    {
        return $this->valueFactory->isCreatableFromEntity($this->entity, $field);
    }

    /**
     * Set a field value object.
     */
    public function set(string $field, ?object $value): void
    {
        $attributeValueMap = $this->extractor->extract($this->entity->getEntityType(), $field, $value);

        $this->entity->set($attributeValueMap);
    }
}