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) 1999-2001 by Sun Microsystems, Inc.
  26  * All rights reserved.
  27  */
  28 package com.sun.dhcpmgr.client;
  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 enforces the syntax rules for the name field in the
  37  * dhcptab.  At present, all characters must be printable ASCII, but not the
  38  * comment introduction character '#'.
  39  */
  40 public class DhcptabNameField extends JTextField {
  41 
  42     /**
  43      * Constructs a field initialized to the provided text.  Defaults to
  44      * 20 characters wide.
  45      * @param text the text to display initially
  46      */
  47     public DhcptabNameField(String text) {
  48         this(text, 20);
  49     }
  50     
  51     /**
  52      * Constructs a field initialized to the provided text with the requested
  53      * size.
  54      * @param text the text to display initially
  55      * @param length the length in characters the field should size itself to
  56      */
  57     public DhcptabNameField(String text, int length) {
  58         super(text, length);
  59     }
  60     
  61     protected Document createDefaultModel() {
  62         return new DhcptabNameDocument();
  63     }
  64 }    
  65 
  66 /** 
  67  * This is the recommended way to validate input, as opposed to trapping
  68  * KeyEvents because this will actually catch paste operations as well.
  69  */
  70 class DhcptabNameDocument extends PlainDocument {
  71     public void insertString(int offs, String str, AttributeSet a)
  72             throws BadLocationException {
  73         if (str != null) {
  74             char [] chars = str.toCharArray();
  75             for (int i = 0; i < chars.length; ++i) {
  76                 // Must be a printable ASCII char, but not the comment character
  77                 if (chars[i] < ' ' || chars[i] > '~' || chars[i] == '#') {
  78                     throw new BadLocationException("", offs);
  79                 }
  80             }
  81         }
  82         super.insertString(offs, str, a);
  83     }
  84 }