001 /* 002 Copyright (C) 2003 Laurent Martelli <laurent@aopsys.com> 003 004 This program is free software; you can redistribute it and/or modify 005 it under the terms of the GNU Lesser General Public License as 006 published by the Free Software Foundation; either version 2 of the 007 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 Lesser General Public License for more details. 013 014 You should have received a copy of the GNU Lesser General Public License 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ 017 018 package org.objectweb.jac.aspects.naming; 019 020 import java.util.Hashtable; 021 import java.util.Iterator; 022 import java.util.Map; 023 024 /** 025 * Generate names for objects using the classname and an integer 026 * counter. 027 */ 028 public class NameGenerator extends Hashtable { 029 030 /** 031 * Creates a new NameGenerator 032 */ 033 public NameGenerator() { 034 } 035 036 public synchronized String generateName(String className) { 037 Long n = (Long)get(className); 038 if (n==null) { 039 n = new Long(0); 040 } 041 // Just appending the counter to the classname is dangerous 042 // because if you have 2 classes C1 and C11, you'll get name clashes 043 String res = 044 className.substring(className.lastIndexOf('.')+1).toLowerCase() 045 + "#"+ n; 046 put(className,new Long(n.longValue()+1)); 047 return res; 048 } 049 050 /** 051 * Parses a name and returns its counter 052 */ 053 public static long getCounterFromName(String name) { 054 return Long.parseLong(name.substring(name.indexOf('#')+1)); 055 } 056 057 /** 058 * Gets the value of a counter 059 */ 060 public long getCounter(String className) { 061 Long counter = (Long)get(className); 062 return counter!=null?counter.longValue():-1; 063 } 064 065 /** 066 * Sets a counter 067 */ 068 public void setCounter(String className, long count) { 069 put(className,new Long(count)); 070 } 071 072 /** 073 * 074 */ 075 public synchronized void update(Map counters) { 076 Iterator i = counters.entrySet().iterator(); 077 while(i.hasNext()) { 078 Map.Entry entry = (Map.Entry)i.next(); 079 String name = (String)entry.getKey(); 080 Long value = (Long)entry.getValue(); 081 long current = getCounter(name); 082 if (current<value.longValue()) 083 put(name,value); 084 } 085 } 086 } 087