Source for javax.swing.InputVerifier

   1: /* InputVerifier.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: 
  41: /**
  42:  * Verifies the user input on a component before the focus is shifted.
  43:  * It is sometimes necessary that input components have a valid state before
  44:  * they loose focus. Such components can have a <code>InputVerifier</code>
  45:  * subclass registered, that permits or vetos a focus change request.
  46:  *
  47:  * @author Andrew Selkirk
  48:  */
  49: public abstract class InputVerifier
  50: {
  51:   /**
  52:    * Creates a <code>InputVerifier</code>
  53:    */
  54:   public InputVerifier()
  55:   {
  56:     // Nothing to do here.
  57:   }
  58: 
  59:   /**
  60:    * verify
  61:    *
  62:    * @param component the component to verify
  63:    *
  64:    * @return <code>true</code> if valid, <code>false</code> otherwise.
  65:    */
  66:   public abstract boolean verify(JComponent component);
  67: 
  68:   /**
  69:    * shouldYieldFocus
  70:    *
  71:    * @param component the component to verify
  72:    *
  73:    * @return <code>true</code> if valid, <code>false</code> otherwise.
  74:    */
  75:   public boolean shouldYieldFocus(JComponent component)
  76:   {
  77:     return verify(component);
  78:   }
  79: }