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<?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_Gdata
* @subpackage App
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Util.php 16971 2009-07-22 18:05:45Z mikaelkael $
*/
/**
* Utility class for static functions needed by Zend_Gdata_App
*
* @category Zend
* @package Zend_Gdata
* @subpackage App
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Gdata_App_Util
{
/**
* Convert timestamp into RFC 3339 date string.
* 2005-04-19T15:30:00
*
* @param int $timestamp
* @throws Zend_Gdata_App_InvalidArgumentException
*/
public static function formatTimestamp($timestamp)
{
$rfc3339 = '/^(\d{4})\-?(\d{2})\-?(\d{2})((T|t)(\d{2})\:?(\d{2})' .
'\:?(\d{2})(\.\d{1,})?((Z|z)|([\+\-])(\d{2})\:?(\d{2})))?$/';
if (ctype_digit($timestamp)) {
return gmdate('Y-m-d\TH:i:sP', $timestamp);
} elseif (preg_match($rfc3339, $timestamp) > 0) {
// timestamp is already properly formatted
return $timestamp;
} else {
$ts = strtotime($timestamp);
if ($ts === false) {
require_once 'Zend/Gdata/App/InvalidArgumentException.php';
throw new Zend_Gdata_App_InvalidArgumentException("Invalid timestamp: $timestamp.");
}
return date('Y-m-d\TH:i:s', $ts);
}
}
/** Find the greatest key that is less than or equal to a given upper
* bound, and return the value associated with that key.
*
* @param integer|null $maximumKey The upper bound for keys. If null, the
* maxiumum valued key will be found.
* @param array $collection An two-dimensional array of key/value pairs
* to search through.
* @returns mixed The value corresponding to the located key.
* @throws Zend_Gdata_App_Exception Thrown if $collection is empty.
*/
public static function findGreatestBoundedValue($maximumKey, $collection)
{
$found = false;
$foundKey = $maximumKey;
// Sanity check: Make sure that the collection isn't empty
if (sizeof($collection) == 0) {
require_once 'Zend/Gdata/App/Exception.php';
throw new Zend_Gdata_App_Exception("Empty namespace collection encountered.");
}
if ($maximumKey === null) {
// If the key is null, then we return the maximum available
$keys = array_keys($collection);
sort($keys);
$found = true;
$foundKey = end($keys);
} else {
// Otherwise, we optimistically guess that the current version
// will have a matching namespce. If that fails, we decrement the
// version until we find a match.
while (!$found && $foundKey >= 0) {
if (array_key_exists($foundKey, $collection))
$found = true;
else
$foundKey--;
}
}
// Guard: A namespace wasn't found. Either none were registered, or
// the current protcol version is lower than the maximum namespace.
if (!$found) {
require_once 'Zend/Gdata/App/Exception.php';
throw new Zend_Gdata_App_Exception("Namespace compatible with current protocol not found.");
}
return $foundKey;
}
}
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