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<?php

/* --------------------------------------------------------------
   CategoryRepositoryReaderInterface.php 2016-01-29
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2016 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

/**
 * Interface CategoryRepositoryReaderInterface
 * 
 * This interface defines methods for fetching category records from the database and is used in the category
 * repository among the classes for writing and deleting category records.
 *
 * @category   System
 * @package    Category
 * @subpackage Interfaces
 */
interface CategoryRepositoryReaderInterface
{
    /**
     * Returns a category by the given ID.
     *
     * @param IdType $categoryId Category ID.
     *
     * @return StoredCategoryInterface
     */
    public function getById(IdType $categoryId);
    
    
    /**
     * Returns all Categories with the provided parent ID.
     *
     * @param IdType $parentId
     *
     * @return IdCollection
     */
    public function getByParentId(IdType $parentId);
    
    
    /**
     * Returns an id collection with the ids of subcategories.
     *
     * @param \IdType $parentCategoryId Parent category id.
     *
     * @return IdCollection
     */
    public function getCategoryIdsTree(IdType $parentCategoryId);
}