/**
* Process an unary expression node for nullability
*
* @param UnaryExpression $expression The unary expression node
* to process.
* @param AbstractExpression $parentExpression The parent expression of
* expression node to process.
*
* @return LogicalExpression|null
*/
private function _processUnaryNode(UnaryExpression $expression, $parentExpression)
{
if ($expression->getNodeType() == ExpressionType::NEGATE) {
return $this->_processNodeForNullability($expression->getChild(), $expression);
}
if ($expression->getNodeType() == ExpressionType::NOT_LOGICAL) {
$resultExpression = $this->_processNodeForNullability($expression->getChild(), $expression);
if ($resultExpression == null) {
return null;
}
if ($parentExpression == null) {
return new LogicalExpression($resultExpression, $expression, ExpressionType::AND_LOGICAL);
}
return $resultExpression;
}
throw ODataException::createSyntaxError(Messages::expressionParser2UnexpectedExpression(get_class($expression)));
}
