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<?php
/**
 * The class represents external-only object attributes.
 *
 * PHP version 5
 *
 * @category Kolab
 * @package  Kolab_Server
 * @author   Gunnar Wrobel <wrobel@pardus.de>
 * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @link     http://pear.horde.org/index.php?package=Kolab_Server
 */

/**
 * The class represents external-only object attributes.
 *
 * Copyright 2008-2013 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @category Kolab
 * @package  Kolab_Server
 * @author   Gunnar Wrobel <wrobel@pardus.de>
 * @license  http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @link     http://pear.horde.org/index.php?package=Kolab_Server
 */
class Horde_Kolab_Server_Object_Attribute_External
extends Horde_Kolab_Server_Object_Attribute_Value
{
    /**
     * Return the new internal state for this attribute.
     *
     * @param array $changes The object data that should be updated.
     *
     * @return array The resulting internal state.
     *
     * @throws Horde_Kolab_Server_Exception If storing the value failed.
     */
    public function update(array $changes)
    {
        $changes = parent::update($changes);
        if (!empty($changes)) {
            throw new Horde_Kolab_Server_Exception(
                sprintf(
                    "The value for \"%s\" may not be modified!",
                    $this->_name
                )
            );
        }
        return $changes;
    }
}