001/* 002 * (C) Copyright 2006-2007 Nuxeo SAS (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl-2.1.html 008 * 009 * This library 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 GNU 012 * Lesser General Public License for more details. 013 * 014 * Contributors: 015 * Dragos Mihalache 016 */ 017package org.nuxeo.ecm.platform.uidgen; 018 019import javax.persistence.Column; 020import javax.persistence.Entity; 021import javax.persistence.GeneratedValue; 022import javax.persistence.GenerationType; 023import javax.persistence.Id; 024import javax.persistence.NamedQueries; 025import javax.persistence.NamedQuery; 026import javax.persistence.Table; 027 028import org.apache.commons.logging.Log; 029import org.apache.commons.logging.LogFactory; 030 031/** 032 * UID entity - keeps last indexes of all generated UIDs. 033 */ 034@Entity 035@NamedQueries({ @NamedQuery(name = "UIDSequence.findByKey", query = "from UIDSequenceBean seq where seq.key = :key") }) 036@Table(name = "NXP_UIDSEQ") 037public class UIDSequenceBean { 038 039 public static final Log log = LogFactory.getLog(UIDSequenceBean.class); 040 041 @Id 042 @Column(name = "SEQ_ID", nullable = false) 043 @GeneratedValue(strategy = GenerationType.AUTO) 044 protected int id; 045 046 @Column(name = "SEQ_KEY", nullable = false, unique = true) 047 private String key; 048 049 @Column(name = "SEQ_INDEX", nullable = false) 050 private int index; 051 052 /** 053 * Default constructor needed for EJB container instantiation. 054 */ 055 public UIDSequenceBean() { 056 } 057 058 /** 059 * Constructor taking as argument the key for which this sequence is created. The index is defaulted to 1. 060 * 061 * @param key 062 */ 063 public UIDSequenceBean(String key) { 064 this.key = key; 065 index = 0; 066 } 067 068 public int getId() { 069 return id; 070 } 071 072 public void setId(int id) { 073 this.id = id; 074 } 075 076 public String getKey() { 077 return key; 078 } 079 080 public void setKey(String key) { 081 this.key = key; 082 } 083 084 public int getIndex() { 085 return index; 086 } 087 088 public static String stringify(UIDSequenceBean bean) { 089 return "UIDSeq(" + bean.key + "," + bean.index + ")"; 090 } 091 092 @Override 093 public String toString() { 094 return stringify(this); 095 } 096 097 public int nextIndex() { 098 index += 1; 099 log.debug("updated to " + this); 100 return index; 101 } 102 103}