library/Zend/Gdata/App/Util.php

   1 <?php
   2
   3 /**
   4  * Zend Framework
   5  *
   6  * LICENSE
   7  *
   8  * This source file is subject to the new BSD license that is bundled
   9  * with this package in the file LICENSE.txt.
  10  * It is also available through the world-wide-web at this URL:
  11  * http://framework.zend.com/license/new-bsd
  12  * If you did not receive a copy of the license and are unable to
  13  * obtain it through the world-wide-web, please send an email
  14  * to license@zend.com so we can send you a copy immediately.
  15  *
  16  * @category   Zend
  17  * @package    Zend_Gdata
  18  * @subpackage App
  19  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  20  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  21  * @version    $Id: Util.php 16971 2009-07-22 18:05:45Z mikaelkael $
  22  */
  23
  24 /**
  25  * Utility class for static functions needed by Zend_Gdata_App
  26  *
  27  * @category   Zend
  28  * @package    Zend_Gdata
  29  * @subpackage App
  30  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  31  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  32  */
  33 class Zend_Gdata_App_Util
  34 {
  35
  36     /**
  37      *  Convert timestamp into RFC 3339 date string.
  38      *  2005-04-19T15:30:00
  39      *
  40      * @param int $timestamp
  41      * @throws Zend_Gdata_App_InvalidArgumentException
  42      */
  43     public static function formatTimestamp($timestamp)
  44     {
  45         $rfc3339 = '/^(\d{4})\-?(\d{2})\-?(\d{2})((T|t)(\d{2})\:?(\d{2})' .
  46                    '\:?(\d{2})(\.\d{1,})?((Z|z)|([\+\-])(\d{2})\:?(\d{2})))?$/';
  47
  48         if (ctype_digit($timestamp)) {
  49             return gmdate('Y-m-d\TH:i:sP', $timestamp);
  50         } elseif (preg_match($rfc3339, $timestamp) > 0) {
  51             // timestamp is already properly formatted
  52             return $timestamp;
  53         } else {
  54             $ts = strtotime($timestamp);
  55             if ($ts === false) {
  56                 require_once 'Zend/Gdata/App/InvalidArgumentException.php';
  57                 throw new Zend_Gdata_App_InvalidArgumentException("Invalid timestamp: $timestamp.");
  58             }
  59             return date('Y-m-d\TH:i:s', $ts);
  60         }
  61     }
  62
  63     /** Find the greatest key that is less than or equal to a given upper
  64       * bound, and return the value associated with that key.
  65       *
  66       * @param integer|null $maximumKey The upper bound for keys. If null, the
  67       *        maxiumum valued key will be found.
  68       * @param array $collection An two-dimensional array of key/value pairs
  69       *        to search through.
  70       * @returns mixed The value corresponding to the located key.
  71       * @throws Zend_Gdata_App_Exception Thrown if $collection is empty.
  72       */
  73     public static function findGreatestBoundedValue($maximumKey, $collection)
  74     {
  75         $found = false;
  76         $foundKey = $maximumKey;
  77
  78         // Sanity check: Make sure that the collection isn't empty
  79         if (sizeof($collection) == 0) {
  80             require_once 'Zend/Gdata/App/Exception.php';
  81             throw new Zend_Gdata_App_Exception("Empty namespace collection encountered.");
  82         }
  83
  84         if ($maximumKey === null) {
  85             // If the key is null, then we return the maximum available
  86             $keys = array_keys($collection);
  87             sort($keys);
  88             $found = true;
  89             $foundKey = end($keys);
  90         } else {
  91             // Otherwise, we optimistically guess that the current version
  92             // will have a matching namespce. If that fails, we decrement the
  93             // version until we find a match.
  94             while (!$found && $foundKey >= 0) {
  95                 if (array_key_exists($foundKey, $collection))
  96                     $found = true;
  97                 else
  98                     $foundKey--;
  99             }
 100         }
 101
 102         // Guard: A namespace wasn't found. Either none were registered, or
 103         // the current protcol version is lower than the maximum namespace.
 104         if (!$found) {
 105             require_once 'Zend/Gdata/App/Exception.php';
 106             throw new Zend_Gdata_App_Exception("Namespace compatible with current protocol not found.");
 107         }
 108
 109         return $foundKey;
 110     }
 111
 112 }