public void setParentIdentifier(String parentIdentifier) {

        // Translate root identifier back into null
        if (parentIdentifier != null
                && parentIdentifier.equals(RootConnectionGroup.IDENTIFIER))
            parentIdentifier = null;

        getModel().setParentIdentifier(parentIdentifier);

    }
Sets the identifier of the associated parent connection group. If the
parent is the root connection group, this should be
RootConnectionGroup.IDENTIFIER.

@param parentIdentifier
    The identifier of the connection group to associate as this object's
    parent.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/base/ModeledChildDirectoryObject.java