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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
* @version $Id$
*
* @category Piwik
* @package Piwik
*/
/**
* Creating a new Piwik_Period subclass:
*
* Every overloaded method must start with the code
* if(!$this->subperiodsProcessed)
* {
* $this->generate();
* }
* that checks whether the subperiods have already been computed.
* This is for performance improvements, computing the subperiods is done a per demand basis.
*
* @package Piwik
* @subpackage Piwik_Period
*/
abstract class Piwik_Period
{
protected $subperiods = array();
protected $subperiodsProcessed = false;
protected $label = null;
protected $date = null;
static protected $errorAvailablePeriods = 'day, week, month, year';
public function __construct( $date )
{
$this->checkInputDate( $date );
$this->date = clone $date;
}
/**
* @param $strPeriod "day", "week", "month", "year"
* @param $date Piwik_Date object
* @return Piwik_Period
*/
static public function factory($strPeriod, Piwik_Date $date)
{
switch ($strPeriod) {
case 'day':
return new Piwik_Period_Day($date);
break;
case 'week':
return new Piwik_Period_Week($date);
break;
case 'month':
return new Piwik_Period_Month($date);
break;
case 'year':
return new Piwik_Period_Year($date);
break;
default:
throw new Exception(Piwik_TranslateException('General_ExceptionInvalidPeriod', array($strPeriod, self::$errorAvailablePeriods)));
break;
}
}
/**
* Returns the first day of the period
*
* @return Piwik_Date First day of the period
*/
public function getDateStart()
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
if(count($this->subperiods) == 0)
{
return $this->getDate();
}
$periods = $this->getSubperiods();
$currentPeriod = $periods[0];
while( $currentPeriod->getNumberOfSubperiods() > 0 )
{
$periods = $currentPeriod->getSubperiods();
$currentPeriod = $periods[0];
}
return $currentPeriod->getDate();
}
/**
* Returns the last day of the period ; can be a date in the future
*
* @return Piwik_Date Last day of the period
*/
public function getDateEnd()
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
if(count($this->subperiods) == 0)
{
return $this->getDate();
}
$periods = $this->getSubperiods();
$currentPeriod = $periods[count($periods)-1];
while( $currentPeriod->getNumberOfSubperiods() > 0 )
{
$periods = $currentPeriod->getSubperiods();
$currentPeriod = $periods[count($periods)-1];
}
return $currentPeriod->getDate();
}
public function getId()
{
return Piwik::$idPeriods[$this->getLabel()];
}
public function getLabel()
{
return $this->label;
}
/**
* @return Piwik_Date
*/
protected function getDate()
{
return $this->date;
}
protected function checkInputDate($date)
{
if( !($date instanceof Piwik_Date))
{
throw new Exception("The date must be a Piwik_Date object. " . var_export($date,true));
}
}
protected function generate()
{
$this->subperiodsProcessed = true;
}
public function getNumberOfSubperiods()
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
return count($this->subperiods);
}
/**
* Returns Period_Day for a period made of days (week, month),
* Period_Month for a period made of months (year)
*
* @return array Piwik_Period
*/
public function getSubperiods()
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
return $this->subperiods;
}
/**
* Add a date to the period.
*
* Protected because it not yet supported to add periods after the initialization
*
* @param Piwik_Date Valid Piwik_Date object
*/
protected function addSubperiod( $date )
{
$this->subperiods[] = $date;
}
public function toString()
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
$dateString = array();
foreach($this->subperiods as $period)
{
$dateString[] = $period->toString();
}
return $dateString;
}
public function __toString()
{
return implode(",", $this->toString());
}
public function get( $part= null )
{
if(!$this->subperiodsProcessed)
{
$this->generate();
}
return $this->date->toString($part);
}
abstract public function getPrettyString();
abstract public function getLocalizedShortString();
abstract public function getLocalizedLongString();
}
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