@Override
    public void update(ObjectType object) throws GuacamoleException {
        throw new GuacamoleUnsupportedException("Directory view is read-only");
    }
Creates a new DirectoryView which provides access to a read-only subset
of the objects in the given Directory. Only objects whose identifiers
are within the provided set will be accessible.

@param directory
    The Directory of which this DirectoryView represents a subset.

@param identifiers
    The identifiers of all objects which should be accessible through
    this DirectoryView. Objects which do not have identifiers within
    the provided set will be inaccessible.
guacamole/src/main/java/org/apache/guacamole/rest/directory/DirectoryView.java