001    /**
002     * ========================================
003     * JFreeReport : a free Java report library
004     * ========================================
005     *
006     * Project Info:  http://reporting.pentaho.org/
007     *
008     * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009     *
010     * This library is free software; you can redistribute it and/or modify it under the terms
011     * of the GNU Lesser General Public License as published by the Free Software Foundation;
012     * either version 2.1 of the License, or (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016     * See the GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public License along with this
019     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020     * Boston, MA 02111-1307, USA.
021     *
022     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023     * in the United States and other countries.]
024     *
025     * ------------
026     * $Id: AttributeNameGenerator.java 3048 2007-07-28 18:02:42Z tmorgner $
027     * ------------
028     * (C) Copyright 2000-2005, by Object Refinery Limited.
029     * (C) Copyright 2005-2007, by Pentaho Corporation.
030     */
031    
032    package org.jfree.report.util;
033    
034    import java.util.HashMap;
035    
036    /**
037     * Creation-Date: 21.11.2006, 13:24:41
038     *
039     * @author Thomas Morgner
040     */
041    public class AttributeNameGenerator
042    {
043      private HashMap names;
044    
045      public AttributeNameGenerator()
046      {
047        names = new HashMap();
048      }
049    
050      public String generateName (final String base)
051      {
052        final Long keyObject = (Long) names.get(base);
053        if (keyObject == null)
054        {
055          names.put (base, new Long(0));
056          return base;
057        }
058        else
059        {
060          long keyIdx = keyObject.longValue();
061          String newName = base + keyIdx;
062          while (names.containsKey(newName))
063          {
064            keyIdx += 1;
065            newName = base + keyIdx;
066          }
067    
068          names.put (newName, new Long (0));
069          names.put (base, new Long (keyIdx));
070          return newName;
071        }
072      }
073    
074      public void reset ()
075      {
076        names.clear();
077      }
078    }