<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * 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@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Validate

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Digits.php 22668 2010-07-25 14:50:46Z thomas $

 */

/**

 * @see Zend_Validate_Abstract

 */

require_once 'Zend/Validate/Abstract.php';

/**

 * @category   Zend

 * @package    Zend_Validate

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Validate_Digits extends Zend_Validate_Abstract

{

    const NOT_DIGITS   = 'notDigits';

    const STRING_EMPTY = 'digitsStringEmpty';

    const INVALID      = 'digitsInvalid';

    /**

     * Digits filter used for validation

     *

     * @var Zend_Filter_Digits

     */

    protected static $_filter = null;

    /**

     * Validation failure message template definitions

     *

     * @var array

     */

    protected $_messageTemplates = array(

        self::NOT_DIGITS   => "'%value%' must contain only digits",

        self::STRING_EMPTY => "'%value%' is an empty string",

        self::INVALID      => "Invalid type given. String, integer or float expected",

    );

    /**

     * Defined by Zend_Validate_Interface

     *

     * Returns true if and only if $value only contains digit characters

     *

     * @param  string $value

     * @return boolean

     */

    public function isValid($value)

    {

        if (!is_string($value) && !is_int($value) && !is_float($value)) {

            $this->_error(self::INVALID);

            return false;

        }

        $this->_setValue((string) $value);

        if ('' === $this->_value) {

            $this->_error(self::STRING_EMPTY);

            return false;

        }

        if (null === self::$_filter) {

            require_once 'Zend/Filter/Digits.php';

            self::$_filter = new Zend_Filter_Digits();

        }

        if ($this->_value !== self::$_filter->filter($this->_value)) {

            $this->_error(self::NOT_DIGITS);

            return false;

        }

        return true;

    }

}