/**
*
* Imports XML, defined in $resource, below position $xpathparent and overwrites
* the element $xpathreplaces.
*
* @param string $xpathparent XPath of the parent
* @param string $xpathreplaces XPath of the node that will be replaced
* @param false $xpathreplaces just adds the resource below xpathparent
* @param XMLNode $resource resource to import
* @param null $resource delete resource at position $xpathreplaces
*/
protected function importResource($xpathparent, $resource, $xpathreplaces = false)
{
if (is_a($resource, "XMLNode")) {
$newcontent = $resource;
} else {
if ($resource == null && is_string($xpathreplaces)) {
$newcontent = null;
} else {
$newcontent = new XMLNode($resource, false);
}
}
$parentnodes = $this->xpath($xpathparent, $this->resource);
if ($parentnodes->length != 1) {
throw new Exception("Ambiguous position for new resource! Found " . $parentnodes->length . " possible parent nodes.");
}
$parent = $parentnodes->item(0);
$oldnode = false;
if ($xpathreplaces != false) {
$childnodes = $this->xpath($xpathreplaces, $this->resource);
if ($childnodes->length > 1) {
throw new Exception("Ambiguous replace position for new resource! Found " . $childnodes->length . " possible nodes.");
} else {
if ($childnodes->length == 1) {
$oldnode = $childnodes->item(0);
}
}
}
//newcontent is null -> remove the subtree
if ($newcontent == null) {
if ($oldnode) {
$parent->removeChild($oldnode);
}
return;
}
//Do nothing, if a node should be replaced by itself. Due to referencing this can happen.
if ($oldnode !== false && $oldnode->isSameNode($newcontent->getRootNode())) {
return;
}
$newnode = $this->dom->importNode($newcontent->getRootNode(), true);
if ($oldnode) {
$parent->replaceChild($newnode, $oldnode);
} else {
$parent->appendChild($newnode);
}
}
