<?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_Api2
 * @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)
 */

/**
 * API2 Abstarct Validator
 *
 * This is an object to which we encapsulate all business logic of validation and different invariants.
 * But instead of different validators, we group all logic in one class but in different methods.
 *
 * If fails validation, then validation method returns false, and
 * getErrors() will return an array of errors that explain why the
 * validation failed.
 *
 * @category   Mage
 * @package    Mage_Api2
 * @author     Magento Core Team <core@magentocommerce.com>
 */
abstract class Mage_Api2_Model_Resource_Validator
{
    /**
     * Array of validation failure errors.
     *
     * @var array
     */
    protected $_errors = array();

    /**
     * Set an array of errors
     *
     * @param array $data
     * @return Mage_Api2_Model_Resource_Validator
     */
    protected function _setErrors(array $data)
    {
        $this->_errors = array_values($data);
        return $this;
    }

    /**
     * Add errors
     *
     * @param array $errors
     * @return Mage_Api2_Model_Resource_Validator
     */
    protected function _addErrors($errors)
    {
        foreach ($errors as $error) {
            $this->_addError($error);
        }
        return $this;
    }

    /**
     * Add error
     *
     * @param string $error
     * @return Mage_Api2_Model_Resource_Validator
     */
    protected function _addError($error)
    {
        $this->_errors[] = $error;
        return $this;
    }

    /**
     * Returns an array of errors that explain why the most recent isValidData()
     * call returned false. The array keys are validation failure error identifiers,
     * and the array values are the corresponding human-readable error strings.
     *
     * If isValidData() was never called or if the most recent isValidData() call
     * returned true, then this method returns an empty array.
     *
     * @return array
     */
    public function getErrors()
    {
        return $this->_errors;
    }
}