package org.python.core;public abstract class IdImpl {    public static IdImpl getInstance() {        if (System.getProperty("java.version").compareTo("1.2")>=0) {            try {                return (IdImpl)Class.forName("org.python.core.IdImpl2").newInstance();            } catch(Throwable e) {                return null;            }                    } else {            return new IdImpl1();        }                }        public abstract long id(PyObject o);    public abstract String idstr(PyObject o);            // o should not be an instance of a subclass of PyObject    public abstract long java_obj_id(Object o);    }