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<?php
/**
* Duration (of time) Value
* This data type differs from "period" in that it does not specify start
* and end time, just the duration (5 weeks, 1 day, etc)
* @package qCal
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
* @todo I'm wondering if maybe I should make a qCal_Date_Span class
*
* Value Name: DURATION
*
* Purpose: This value type is used to identify properties that contain
* a duration of time.
*
* Formal Definition: The value type is defined by the following
* notation:
*
* dur-value = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
*
* dur-date = dur-day [dur-time]
* dur-time = "T" (dur-hour / dur-minute / dur-second)
* dur-week = 1*DIGIT "W"
* dur-hour = 1*DIGIT "H" [dur-minute]
* dur-minute = 1*DIGIT "M" [dur-second]
* dur-second = 1*DIGIT "S"
* dur-day = 1*DIGIT "D"
*
* Description: If the property permits, multiple "duration" values are
* specified by a COMMA character (US-ASCII decimal 44) separated list
* of values. The format is expressed as the [ISO 8601] basic format for
* the duration of time. The format can represent durations in terms of
* weeks, days, hours, minutes, and seconds.
*
* No additional content value encoding (i.e., BACKSLASH character
* encoding) are defined for this value type.
*
* Example: A duration of 15 days, 5 hours and 20 seconds would be:
*
* P15DT5H0M20S
*
* A duration of 7 weeks would be:
*
* P7W
*/
class qCal_Value_Duration extends qCal_Value {
/**
* Convert seconds to duration
* @todo Some type of caching? This probably doesn't need to be "calculated" every time if it hasnt changed
*/
protected function toString($value) {
return $value->toICal();
}
/**
* Convert to internal representation
*/
protected function doCast($value) {
return new qCal_DateTime_Duration($value);
}
}