/** Constructor for creating a new boolean literal
*
* If the value is not a string, then it will be converted to 'true' or 'false'.
*
* @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 $datatype Optional datatype (default 'xsd:boolean')
*/
public function __construct($value, $lang = null, $datatype = null)
{
if (!is_string($value)) {
$value = $value ? 'true' : 'false';
}
parent::__construct($value, null, $datatype);
}
/** Constructor for creating a new xsd:hexBinary literal
*
* @param mixed $value The value of the literal (already encoded as hexadecimal)
* @param string $lang Should be null (literals with a datatype can't have a language)
* @param string $datatype Optional datatype (default 'xsd:hexBinary')
*
* @throws \InvalidArgumentException
*/
public function __construct($value, $lang = null, $datatype = null)
{
// Normalise the canonical representation, as specified here:
// http://www.w3.org/TR/xmlschema-2/#hexBinary-canonical-repr
$value = strtoupper($value);
// Validate the data
if (preg_match('/[^A-F0-9]/', $value)) {
throw new \InvalidArgumentException("Literal of type xsd:hexBinary contains non-hexadecimal characters");
}
parent::__construct(strtoupper($value), null, 'xsd:hexBinary');
}
/** 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 $datatype Optional datatype (default 'xsd:date')
*/
public function __construct($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);
}
/** Constructor for creating a new decimal literal
*
* @param double|int|string $value The value of the literal
* @param string $lang Should be null (literals with a datatype can't have a language)
* @param string $datatype Optional datatype (default 'xsd:decimal')
*
* @throws \UnexpectedValueException
*/
public function __construct($value, $lang = null, $datatype = null)
{
if (is_string($value)) {
self::validate($value);
} elseif (is_double($value) or is_int($value)) {
$locale_data = localeconv();
$value = str_replace($locale_data['decimal_point'], '.', strval($value));
} else {
throw new \UnexpectedValueException('EasyRdf\\Literal\\Decimal expects int/float/string as value');
}
$value = self::canonicalise($value);
parent::__construct($value, null, $datatype);
}
/** Constructor for creating a new date and time literal
*
* If the value is a DateTime object, then it will be converted to the xsd:dateTime format.
* If no value is given or is is null, then the current time 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 $datatype Optional datatype (default 'xsd:dateTime')
*/
public function __construct($value = null, $lang = null, $datatype = null)
{
// If $value is null, use 'now'
if (is_null($value)) {
$value = new \DateTime('now');
}
// Convert DateTime objects into string
if ($value instanceof \DateTime) {
$atom = $value->format(\DateTime::ATOM);
$value = preg_replace('/[\\+\\-]00(\\:?)00$/', 'Z', $atom);
}
Literal::__construct($value, null, $datatype);
}
/**
* Proceeds to a copy of resource provided as argument and stores it.
*
* @param BaseResource $resource
*
* @return BaseResource
*/
public function takeSnapshot($resource)
{
$res = $this->resource($resource->getUri());
$graph = $resource->getGraph();
foreach ($graph->toRdfPhp() as $resource2 => $properties) {
if ($resource2 !== $res->getUri()) {
continue;
}
if (!$this->unitOfWork->isManagementBlackListed($resource2)) {
foreach ($properties as $property => $values) {
foreach ($values as $value) {
if ($value['type'] === 'bnode' || $value['type'] === 'uri') {
$this->addResource($resource2, $property, $value['value']);
} elseif ($value['type'] === 'literal') {
$this->addLiteral($resource2, $property, Literal::create($value['value'], isset($value['lang']) ? $value['lang'] : null, isset($value['datatype']) ? $value['datatype'] : null));
} else {
}
}
}
}
}
return $res;
}
/** Constructor for creating a new rdf:HTML literal
*
* @param mixed $value The HTML fragment
* @param string $lang Should be null (literals with a datatype can't have a language)
* @param string $datatype Optional datatype (default 'rdf:HTML')
*/
public function __construct($value, $lang = null, $datatype = null)
{
parent::__construct($value, null, $datatype);
}
/** Create a new EasyRdf\Resource or EasyRdf\Literal depending
* on the type of data passed in.
*
* @ignore
*/
protected function newTerm($data)
{
switch ($data['type']) {
case 'bnode':
return new Resource('_:' . $data['value']);
case 'uri':
return new Resource($data['value']);
case 'literal':
case 'typed-literal':
return Literal::create($data);
default:
throw new Exception("Failed to parse SPARQL Query Results format, unknown term type: " . $data['type']);
}
}
