001 /*-----------------------------------------------------------------------
002 * Copyright (C) 2006
003 * Associated Universities, Inc. Washington DC, USA.
004 * This program is free software; you can redistribute it and/or
005 * modify it under the terms of the GNU General Public License as
006 * published by the Free Software Foundation; either version 2 of
007 * the License, or (at your option) any later version.
008 *
009 * This program is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
012 * GNU General Public License for more details.
013 *
014 * Correspondence concerning this software should be addressed as follows:
015 * Internet email: switz@nrao.edu
016 * Postal address: User Database
017 * National Radio Astronomy Observatory
018 * Post Office Box 0
019 * Socorro, NM 87801 USA
020 *-----------------------------------------------------------------------*/
021 package edu.nrao.sss.model.user;
022
023 import java.io.Serializable;
024
025 public abstract class ObjectId implements Serializable {
026
027 private static final long serialVersionUID = -1L;
028
029 private int hashCode;
030
031 private int id;
032
033 public ObjectId() {
034 this.id = this.hashCode = 0;
035 }
036
037 public ObjectId(ObjectId objectId) {
038 setId(objectId.getId());
039 }
040
041 public abstract boolean equals(Object obj);
042
043 public int getId() {
044 return id;
045 }
046
047 public int hashCode() {
048 if (this.hashCode == Integer.MIN_VALUE) {
049 return (int) this.getId();
050 }
051 return this.hashCode;
052 }
053
054 public boolean isNew() {
055 return (this.hashCode == Integer.MIN_VALUE) ? false : true;
056 }
057
058 public void setId(int id) {
059 if (id < 0) {
060 this.id = 0;
061 this.hashCode = 0;
062 } else {
063 this.id = id;
064 this.hashCode = Integer.MIN_VALUE;
065 }
066 }
067
068 }