private DataTree convertThisSnapShot() throws IOException {
// create a datatree
DataTree dataTree = new DataTree();
DataNodeV1 oldDataNode = oldDataTree.getNode("");
if (oldDataNode == null) {
// should never happen
LOG.error("Upgrading from an empty snapshot.");
}
recurseThroughDataTree(dataTree, "");
dataTree.lastProcessedZxid = oldDataTree.lastProcessedZxid;
return dataTree;
}
/**
* recurse through the old datatree and construct the new data tree
*
* @param dataTree the new datatree to be constructed
* @param path the path to start with
*/
private void recurseThroughDataTree(DataTree dataTree, String path) {
if (path == null) return;
DataNodeV1 oldDataNode = oldDataTree.getNode(path);
HashSet<String> children = oldDataNode.children;
DataNode parent = null;
if ("".equals(path)) {
parent = null;
} else {
int lastSlash = path.lastIndexOf('/');
String parentPath = path.substring(0, lastSlash);
parent = dataTree.getNode(parentPath);
}
DataNode thisDatNode = convertDataNode(dataTree, parent, oldDataNode);
dataTree.addDataNode(path, thisDatNode);
if (children == null || children.size() == 0) {
return;
} else {
for (String child : children) {
recurseThroughDataTree(dataTree, path + "/" + child);
}
}
}
