1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * ident        "%Z%%M% %I%     %E% SMI"
  24  *
  25  * Copyright (c) 1998-1999 by Sun Microsystems, Inc.
  26  * All rights reserved.
  27  */
  28 package com.sun.dhcpmgr.ui;
  29 
  30 import java.awt.*;
  31 import java.awt.event.*;
  32 import javax.swing.*;
  33 import javax.swing.text.*;
  34 
  35 /**
  36  * A text field which disallows whitespace in its input
  37  */
  38 public class NoSpaceField extends JTextField {
  39 
  40     /**
  41      * Constructs an empty field, 20 characters wide.
  42      */
  43     public NoSpaceField() {
  44         this("");
  45     }
  46     
  47     /**
  48      * Constructs a field initialized to the provided text.  Defaults to
  49      * 20 characters wide.
  50      * @param text the text to display initially
  51      */
  52     public NoSpaceField(String text) {
  53         this(text, 20);
  54     }
  55     
  56     /**
  57      * Constructs a field initialized to the provided text with the requested
  58      * size.
  59      * @param text the text to display initially
  60      * @param length the length in characters the field should size itself to
  61      */
  62     public NoSpaceField(String text, int length) {
  63         super(text, length);
  64     }
  65     
  66     protected Document createDefaultModel() {
  67         return new NoSpaceDocument();
  68     }
  69     
  70     /* 
  71      * This is the recommended way to validate input, as opposed to trapping
  72      * KeyEvents because this will actually catch paste operations as well.
  73      */
  74     static class NoSpaceDocument extends PlainDocument {
  75         public void insertString(int offs, String str, AttributeSet a)
  76                 throws BadLocationException {
  77             if (str != null) {
  78                 char [] chars = str.toCharArray();
  79                 for (int i = 0; i < chars.length; ++i) {
  80                     if (Character.isWhitespace(chars[i])) {
  81                         throw new BadLocationException("", offs);
  82                     }
  83                 }
  84             }
  85             super.insertString(offs, str, a);
  86         }
  87     }
  88 }