Source for javax.swing.ListModel

   1: /* ListModel.java --
   2:    Copyright (C) 2002, 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
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  34: this exception to your version of the library, but you are not
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  36: exception statement from your version. */
  37: 
  38: package javax.swing;
  39: 
  40: import javax.swing.event.ListDataListener;
  41: 
  42: /**
  43:  * The data model that is typically used in {@link JList}.
  44:  *
  45:  * @author Graydon Hoare (graydon@redhat.com)
  46:  */
  47: public interface ListModel
  48: {
  49:   /**
  50:    * Return the number of data elements in the list.
  51:    *
  52:    * @return The number of data elements in the list
  53:    */
  54:   int getSize();
  55: 
  56:   /**
  57:    * Retrieves a data element at a specified index.
  58:    *
  59:    * @param index The index of the element to retrieve
  60:    *
  61:    * @return The data element at the specified index
  62:    */
  63:   Object getElementAt(int index);
  64: 
  65:   /**
  66:    * Add a listener object to this model. The listener will be called
  67:    * any time the set of elements in the model is changed.
  68:    *
  69:    * @param l The listener to add
  70:    */
  71:   void addListDataListener(ListDataListener l);
  72: 
  73:   /**
  74:    * Add a listener object to this model. The listener will no longer be
  75:    * called when the set of elements in the model is changed.
  76:    *
  77:    * @param l The listener to remove
  78:    */
  79:   void removeListDataListener(ListDataListener l);
  80: }