FormatException.php

<?php
/*
* Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

namespace Zxing;

/**
 * Thrown when a barcode was successfully detected, but some aspect of
 * the content did not conform to the barcode's format rules. This could have
 * been due to a mis-detection.
 *
 * @author Sean Owen
 */
final class FormatException extends ReaderException
{
    private static $instance;

    public function __construct($cause = null)
    {
        if ($cause) {
            parent::__construct($cause);
        }
    }

    public static function getFormatInstance($cause = null)
    {
        if (!self::$instance) {
            self::$instance = new FormatException();
        }
        if (self::$isStackTrace) {
            return new FormatException($cause);
        } else {
            return self::$instance;
        }
    }
}