tdcommon/src/main/java/thredds/server/catalog/DataRootPathMatcher.java
private boolean put(DataRootExt dateRootExt) {
    map.put(dateRootExt.getPath(), dateRootExt);
    return treeSet.add(dateRootExt.getPath());
  }
private boolean put(DataRootExt dateRootExt) {
    map.put(dateRootExt.getPath(), dateRootExt);
    return treeSet.add(dateRootExt.getPath());
  }
Add a dataRootExt to in-memory tree.
@return true if not already exist