<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Tax
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Tax rate resource model
 *
 * @category    Mage
 * @package     Mage_Tax
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Tax_Model_Resource_Calculation_Rate extends Mage_Core_Model_Resource_Db_Abstract
{
    /**
     * Resource initialization
     */
    protected function _construct()
    {
        $this->_init('tax/tax_calculation_rate', 'tax_calculation_rate_id');
    }

    /**
     * Initialize unique fields
     *
     * @return Mage_Tax_Model_Resource_Calculation_Rate
     */
    protected function _initUniqueFields()
    {
        $this->_uniqueFields = array(array(
            'field' => array('code'),
            'title' => Mage::helper('tax')->__('Code'),
        ));
        return $this;
    }

    /**
     * Delete all rates
     *
     * @return Mage_Tax_Model_Resource_Calculation_Rate
     */
    public function deleteAllRates()
    {
        $this->_getWriteAdapter()->delete($this->getMainTable());
        return $this;
    }

    /**
     * Check if this rate exists in rule
     *
     * @param  int $rateId
     * @return array
     */
    public function isInRule($rateId)
    {
        $adapter = $this->_getReadAdapter();
        $select  = $adapter->select()
            ->from($this->getTable('tax/tax_calculation'), array('tax_calculation_rate_id'))
            ->where('tax_calculation_rate_id = ?', $rateId);
        return $adapter->fetchCol($select);
    }
}
