Source for org.jfree.report.util.AttributeNameGenerator

   1: /**
   2:  * ========================================
   3:  * JFreeReport : a free Java report library
   4:  * ========================================
   5:  *
   6:  * Project Info:  http://reporting.pentaho.org/
   7:  *
   8:  * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
   9:  *
  10:  * This library is free software; you can redistribute it and/or modify it under the terms
  11:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
  12:  * either version 2.1 of the License, or (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  15:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16:  * See the GNU Lesser General Public License for more details.
  17:  *
  18:  * You should have received a copy of the GNU Lesser General Public License along with this
  19:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20:  * Boston, MA 02111-1307, USA.
  21:  *
  22:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
  23:  * in the United States and other countries.]
  24:  *
  25:  * ------------
  26:  * $Id: AttributeNameGenerator.java 2725 2007-04-01 18:49:29Z taqua $
  27:  * ------------
  28:  * (C) Copyright 2000-2005, by Object Refinery Limited.
  29:  * (C) Copyright 2005-2007, by Pentaho Corporation.
  30:  */
  31: 
  32: package org.jfree.report.util;
  33: 
  34: import java.util.HashMap;
  35: 
  36: /**
  37:  * Creation-Date: 21.11.2006, 13:24:41
  38:  *
  39:  * @author Thomas Morgner
  40:  */
  41: public class AttributeNameGenerator
  42: {
  43:   private HashMap names;
  44: 
  45:   public AttributeNameGenerator()
  46:   {
  47:     names = new HashMap();
  48:   }
  49: 
  50:   public String generateName (final String base)
  51:   {
  52:     final Long keyObject = (Long) names.get(base);
  53:     if (keyObject == null)
  54:     {
  55:       names.put (base, new Long(0));
  56:       return base;
  57:     }
  58:     else
  59:     {
  60:       long keyIdx = keyObject.longValue();
  61:       String newName = base + keyIdx;
  62:       while (names.containsKey(newName))
  63:       {
  64:         keyIdx += 1;
  65:         newName = base + keyIdx;
  66:       }
  67: 
  68:       names.put (newName, new Long (0));
  69:       names.put (base, new Long (keyIdx));
  70:       return newName;
  71:     }
  72:   }
  73: 
  74:   public void reset ()
  75:   {
  76:     names.clear();
  77:   }
  78: }