libjava/classpath/javax/swing/ListModel.java

   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
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  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 }