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    1   /*
    2    * Copyright (c) 1997, 2001, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package javax.swing;
   27   
   28   import javax.swing.event.ListDataListener;
   29   
   30   /**
   31    * This interface defines the methods components like JList use
   32    * to get the value of each cell in a list and the length of the list.
   33    * Logically the model is a vector, indices vary from 0 to
   34    * ListDataModel.getSize() - 1.  Any change to the contents or
   35    * length of the data model must be reported to all of the
   36    * ListDataListeners.
   37    *
   38    * @param <E> the type of the elements of this model
   39    *
   40    * @author Hans Muller
   41    * @see JList
   42    */
   43   public interface ListModel<E>
   44   {
   45     /**
   46      * Returns the length of the list.
   47      * @return the length of the list
   48      */
   49     int getSize();
   50   
   51     /**
   52      * Returns the value at the specified index.
   53      * @param index the requested index
   54      * @return the value at <code>index</code>
   55      */
   56     E getElementAt(int index);
   57   
   58     /**
   59      * Adds a listener to the list that's notified each time a change
   60      * to the data model occurs.
   61      * @param l the <code>ListDataListener</code> to be added
   62      */
   63     void addListDataListener(ListDataListener l);
   64   
   65     /**
   66      * Removes a listener from the list that's notified each time a
   67      * change to the data model occurs.
   68      * @param l the <code>ListDataListener</code> to be removed
   69      */
   70     void removeListDataListener(ListDataListener l);
   71   }

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