Source for gnu.java.beans.encoder.MapPersistenceDelegate

   1: /* MapPersistenceDelegate.java -- A PersistenceDelegate for Map subclasses.
   2: 
   3:  Copyright (C) 2005 Free Software Foundation, Inc.
   4: 
   5:  This file is part of GNU Classpath.
   6: 
   7:  GNU Classpath is free software; you can redistribute it and/or modify
   8:  it under the terms of the GNU General Public License as published by
   9:  the Free Software Foundation; either version 2, or (at your option)
  10:  any later version.
  11: 
  12:  GNU Classpath is distributed in the hope that it will be useful, but
  13:  WITHOUT ANY WARRANTY; without even the implied warranty of
  14:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15:  General Public License for more details.
  16: 
  17:  You should have received a copy of the GNU General Public License
  18:  along with GNU Classpath; see the file COPYING.  If not, write to the
  19:  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20:  02110-1301 USA.
  21: 
  22:  Linking this library statically or dynamically with other modules is
  23:  making a combined work based on this library.  Thus, the terms and
  24:  conditions of the GNU General Public License cover the whole
  25:  combination.
  26: 
  27:  As a special exception, the copyright holders of this library give you
  28:  permission to link this library with independent modules to produce an
  29:  executable, regardless of the license terms of these independent
  30:  modules, and to copy and distribute the resulting executable under
  31:  terms of your choice, provided that you also meet, for each linked
  32:  independent module, the terms and conditions of the license of that
  33:  module.  An independent module is a module which is not derived from
  34:  or based on this library.  If you modify this library, you may extend
  35:  this exception to your version of the library, but you are not
  36:  obligated to do so.  If you do not wish to do so, delete this
  37:  exception statement from your version. */
  38: 
  39: 
  40: package gnu.java.beans.encoder;
  41: 
  42: import java.util.Map;
  43: import java.beans.Encoder;
  44: import java.beans.Expression;
  45: import java.beans.PersistenceDelegate;
  46: import java.beans.Statement;
  47: 
  48: import java.util.Iterator;
  49: 
  50: /**
  51:  * @author Robert Schuster (robertschuster@fsfe.org)
  52:  */
  53: public class MapPersistenceDelegate extends PersistenceDelegate
  54: {
  55: 
  56:   protected Expression instantiate(Object oldInstance, Encoder out)
  57:   {
  58:     return new Expression(
  59:                           oldInstance,
  60:                           oldInstance.getClass(),
  61:                           "new",
  62:                           null);
  63:   }
  64: 
  65:   protected void initialize(Class type, Object oldInstance, Object newInstance,
  66:                             Encoder out)
  67:   {
  68:     Map map = (Map) oldInstance;
  69:     Iterator ite = map.keySet().iterator();
  70: 
  71:     while (ite.hasNext())
  72:       {
  73:         Object key = ite.next();
  74:         out.writeStatement(new Statement(oldInstance, "put",
  75:                                          new Object[] { key, map.get(key) }));
  76: 
  77:       }
  78: 
  79:   }
  80: 
  81: }