needExtendsClassMolder.put( extName, me );
needExtendsClassMolder.add( new Pair( extName, me ) );
    boolean pairExtends( ClassMolder me, String extName ) {        if ( extName == null || extName.equals("") )            throw new IllegalArgumentException("Null classname not allowed!");        ClassMolder clsMold = (ClassMolder) clsMolders.get( extName );        if ( clsMold != null ) {            me.setExtends( clsMold );            SQLEngine sql = ((SQLEngine)me.getPersistence());            sql.setExtends((SQLEngine)clsMold.getPersistence() );            return true;        }        if ( needExtendsClassMolder == null )            needExtendsClassMolder = new Hashtable();        needExtendsClassMolder.put( extName, me );        return false;    }