/**
* Read the given expand clause and build 'Projection Tree',
* do nothing if the clause is null
*
* @param string $expand Value of $expand clause.
*
* @return void
*
* @throws ODataException If any error occurs while reading expand clause
* or building the projection tree
*/
private function _parseExpand($expand)
{
if (!is_null($expand)) {
$pathSegments = $this->_readExpandOrSelect($expand, false);
$this->_buildProjectionTree($pathSegments);
$this->_rootProjectionNode->setExpansionSpecified();
}
}
