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<?php
/**
 * Copyright 2012-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file LICENSE for license information (ASL).  If you
 * did not receive this file, see http://www.horde.org/licenses/apache.
 *
 * @author   Mike Cochrane <mike@graftonhall.co.nz>
 * @author   Jan Schneider <jan@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/apache ASL
 * @package  Ingo
 */

/**
 * The Ingo_Script_Sieve_Test class represents a Sieve Test.
 *
 * A test is a piece of code that evaluates to true or false.
 *
 * @author   Mike Cochrane <mike@graftonhall.co.nz>
 * @author   Jan Schneider <jan@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/apache ASL
 * @package  Ingo
 */
abstract class Ingo_Script_Sieve_Test implements Ingo_Script_Item
{
    /**
     * Any necessary test parameters.
     *
     * @var array
     */
    protected $_vars = array();

    /**
     * Checks if the rule parameters are valid.
     *
     * @return boolean|string  True if this rule is valid, an error message
     *                         otherwise.
     */
    abstract public function check();

    /**
     * Returns a list of sieve extensions required for this rule and any
     * sub-rules.
     *
     * @return array  A Sieve extension list.
     */
    public function requires()
    {
        return array();
    }
}