/**
* Creates an instance of KeyDescriptor by parsing a key predicate, also
* validates the KeyDescriptor
*
* @param string $segment The uri segment in the form identifier
* (keyPredicate)
* @param ResourceType $resourceType The Resource type whose keys need to
* be parsed
* @param string $keyPredicate The key predicate to parse and generate
* KeyDescriptor for
*
* @return KeyDescriptor Describes the key values in the $keyPredicate
*
* @throws ODataException Exception if any error occurs while parsing and
* validating the key predicate
*/
private function _createKeyDescriptor($segment, ResourceType $resourceType, $keyPredicate)
{
/**
* @var KeyDescriptor
*/
$keyDescriptor = null;
if (!KeyDescriptor::tryParseKeysFromKeyPredicate($keyPredicate, $keyDescriptor)) {
ODataException::createSyntaxError(Messages::syntaxError());
}
// Note: Currenlty WCF Data Service does not support multiple
// 'Positional values' so Order_Details(10248, 11) is not valid
if (!$keyDescriptor->isEmpty() && !$keyDescriptor->areNamedValues() && $keyDescriptor->valueCount() > 1) {
ODataException::createSyntaxError(Messages::segmentParserKeysMustBeNamed($segment));
}
try {
$keyDescriptor->validate($segment, $resourceType);
} catch (ODataException $exception) {
throw $exception;
}
return $keyDescriptor;
}
