public function swapData($node_name1, $node_name2)
{
if (!$this->hasIdentifier($node_name1)) {
throw new e\NodeException(S_SPAN . "The node {$node_name1} does not exists." . E_SPAN);
}
if (!$this->hasIdentifier($node_name2)) {
throw new e\NodeException(S_SPAN . "The node {$node_name2} does not exists." . E_SPAN);
}
// must be siblings
if (StructuredDataNode::removeLastIndex($node_name1) != StructuredDataNode::removeLastIndex($node_name2)) {
throw new e\NodeException(S_SPAN . "The nodes {$node_name1} and {$node_name2} are not siblings." . E_SPAN);
}
$par_id = $this->node_map[$node_name1]->getParentId();
// get the data
$node1_data = $this->node_map[$node_name1]->toStdClass();
$node2_data = $this->node_map[$node_name2]->toStdClass();
if (self::DEBUG) {
u\DebugUtility::out("Parent ID: {$par_id}" . BR . "Node 1: {$node_name1}" . BR . "Node 2: {$node_name2}");
}
if ($par_id != '') {
$siblings = $this->node_map[$par_id]->getChildren();
} else {
$siblings = $this->children;
}
$sibling_count = count($siblings);
if (self::DEBUG) {
u\DebugUtility::out("Sibling count: {$sibling_count}");
}
for ($i = 0; $i < $sibling_count; $i++) {
if (self::DEBUG) {
u\DebugUtility::out($siblings[$i]->getIdentifier());
}
// find the two positions
if ($siblings[$i]->getIdentifier() == $node_name1) {
$node_pos1 = $i;
if (self::DEBUG) {
u\DebugUtility::out("Node 1 position: {$node_pos1}");
}
}
if ($siblings[$i]->getIdentifier() == $node_name2) {
$node_pos2 = $i;
if (self::DEBUG) {
u\DebugUtility::out("Node 2 position: {$node_pos2}" . BR);
}
}
}
// create new nodes
$new_node1 = new StructuredDataNode($node2_data, NULL, $this->data_definition, $node_pos1, $par_id . structuredDataNode::DELIMITER);
$new_node2 = new StructuredDataNode($node1_data, NULL, $this->data_definition, $node_pos2, $par_id . structuredDataNode::DELIMITER);
// insert new nodes
// must assign new nodes to the original arrays, not $siblings
if ($par_id != '') {
$this->node_map[$par_id]->swapChildren($node_pos1, $new_node1, $node_pos2, $new_node2);
} else {
$this->children[$node_pos1] = $new_node1;
$this->children[$node_pos2] = $new_node2;
}
$this->node_map[$node_name1] = $new_node1;
$this->node_map[$node_name2] = $new_node2;
return $this;
}
