public function getNumberOfSiblings($node_name)
{
if (self::DEBUG) {
u\DebugUtility::out("Node ID: " . $node_name);
}
$par_id = $this->node_map[$node_name]->getParentId();
if (self::DEBUG) {
u\DebugUtility::out("Parent ID: " . $par_id);
}
if (!in_array($node_name, $this->identifiers)) {
throw new e\NodeException(S_SPAN . "The node {$node_name} does not exist" . E_SPAN);
}
if ($par_id != '') {
$siblings = $this->node_map[$par_id]->getChildren();
} else {
$siblings = $this->children;
}
// remove ;0
$field_id = StructuredDataNode::removeLastIndex($node_name);
if (self::DEBUG) {
u\DebugUtility::out("Field ID: " . $field_id);
}
$last_sibling_index = StructuredDataNode::getPositionOfLastNode($siblings, $field_id);
$last_id = $siblings[$last_sibling_index]->getIdentifier();
return StructuredDataNode::getLastIndex($last_id) + 1;
}
