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<?php
/* --------------------------------------------------------------
   AttachmentCollection.inc.php 2015-01-30 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('AbstractCollection');
MainFactory::load_class('AttachmentCollectionInterface');

/**
 * Class AttachmentCollection
 *
 * Handles the attachment collections of an Email.
 *
 * @category   System
 * @package    Email
 * @subpackage Collections
 */
class AttachmentCollection extends AbstractCollection implements AttachmentCollectionInterface
{
    /**
     * Adds a new attachment to the collection.
     *
     * @param EmailAttachmentInterface $attachment E-Mail attachment.
     */
    public function add(EmailAttachmentInterface $attachment)
    {
        $this->_add($attachment);
    }


    /**
     * Removes an attachment from collection.
     *
     * @param EmailAttachmentInterface $attachment E-Mail attachment.
     *
     * @throws Exception If attachment could not be found.
     */
    public function remove(EmailAttachmentInterface $attachment)
    {
        $index = array_search($attachment, $this->collectionContentArray);

        if($index === false)
        {
            throw new Exception('Could not remove attachment because it does not exist in collection.');
        }

        unset($this->collectionContentArray[$index]);
    }


    /**
     * Removes all attachments of collection.
     */
    public function clear()
    {
        $this->collectionContentArray = array();
    }


    /**
     * Returns the type of the collection items.
     *
     * @return string Valid type.
     */
    protected function _getValidType()
    {
        return 'EmailAttachmentInterface';
    }
}