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<?php
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
/**
* Class that represents an RDF Literal of datatype xsd:date
*
* @package EasyRdf
* @link http://www.w3.org/TR/xmlschema-2/#date
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Literal_Date extends EasyRdf_Literal
{
/** Constructor for creating a new date literal
*
* If the value is a DateTime object, then it will be converted to the xsd:date format.
* If no value is given or is is null, then the current date is used.
*
* @see DateTime
*
* @param mixed $value The value of the literal
* @param string $lang Should be null (literals with a datatype can't have a language)
* @param string $datatype Optional datatype (default 'xsd:date')
* @return object EasyRdf_Literal_Date
*/
public function __construct($value = null, $lang = null, $datatype = null)
{
// If $value is null, use today's date
if (is_null($value)) {
$value = new DateTime('today');
}
// Convert DateTime object into string
if ($value instanceof DateTime) {
$value = $value->format('Y-m-d');
}
parent::__construct($value, null, $datatype);
}
/** Parses a string using DateTime and creates a new literal
*
* Example:
* $date = EasyRdf_Literal_Date::parse('1 January 2011');
*
* @see DateTime
* @param string $value The date to parse
* @return object EasyRdf_Literal_Date
*/
public static function parse($value)
{
$value = new DateTime($value);
return new EasyRdf_Literal_Date($value);
}
/** Returns the date as a PHP DateTime object
*
* @see DateTime::format
* @return string
*/
public function getValue()
{
return new DateTime($this->value);
}
/** Returns date formatted according to given format
*
* @see DateTime::format
* @param string $format
* @return string
*/
public function format($format)
{
return $this->getValue()->format($format);
}
/** A full integer representation of the year, 4 digits
*
* @return integer
*/
public function year()
{
return (int)$this->format('Y');
}
/** Integer representation of the month
*
* @return integer
*/
public function month()
{
return (int)$this->format('m');
}
/** Integer representation of the day of the month
*
* @return integer
*/
public function day()
{
return (int)$this->format('d');
}
}