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 limits input to only digits.
  37  */
  38 public class IntegerField extends JTextField {
  39 
  40     /**
  41      * Construct an empty field
  42      */
  43     public IntegerField() {
  44         this("");
  45     }
  46     
  47     /**
  48      * Construct a field initialized to the specified text.  Defaults to a width
  49      * of 5 characters.
  50      * @param text The initial text to display
  51      */
  52     public IntegerField(String text) {
  53         this(text, 5);
  54     }
  55     
  56     /**
  57      * Construct a field initialized to the specified value.  Defaults to a
  58      * width of 5 characters.
  59      * @param value The initial value to display
  60      */
  61     public IntegerField(int value) {
  62         this();
  63         setValue(value);
  64     }
  65     
  66     /**
  67      * Construct a field initialized to the specified Integer object.
  68      * Defaults to a width of 5 characters.
  69      * @param value The initial value to display
  70      */
  71     public IntegerField(Integer value) {
  72         this();
  73         setValue(value);
  74     }
  75     
  76     /**
  77      * Construct a field initialized to the specified text and width.
  78      * @param text The initial text to display
  79      * @param width The width of the field in characters
  80      */
  81     public IntegerField(String text, int width) {
  82         super(text, width);
  83         setHorizontalAlignment(RIGHT);
  84     }
  85     
  86     /**
  87      * Set the value of the field
  88      * @param value An <code>int</code> value to set
  89      */
  90     public void setValue(int value) {
  91         setText(String.valueOf(value));
  92     }
  93     
  94     /**
  95      * Set the value of the field
  96      * @param value The value to set as an <code>Integer</code>
  97      */
  98     public void setValue(Integer value) {
  99         if (value != null) {
 100             setValue(value.intValue());
 101         }
 102     }
 103     
 104     /**
 105      * Retrieve the entered value
 106      * @return The value stored in the field as an <code>int</code>
 107      */
 108     public int getValue() {
 109         String s = getText();
 110         if ((s == null) || (s.length() == 0)) {
 111             return 0;
 112         } else {
 113             return Integer.parseInt(getText());
 114         }
 115     }
 116 
 117     protected Document createDefaultModel() {
 118         return new IntegerDocument();
 119     }
 120     
 121     /* 
 122      * This is the recommended way to validate input, as opposed to trapping
 123      * KeyEvents because this will actually catch paste operations as well.
 124      */
 125     static class IntegerDocument extends PlainDocument {
 126         public void insertString(int offs, String str, AttributeSet a)
 127                 throws BadLocationException {
 128             if (str != null) {
 129                 char [] chars = str.toCharArray();
 130                 for (int i = 0; i < chars.length; ++i) {
 131                     if (!Character.isDigit(chars[i])) {
 132                         throw new BadLocationException("", offs);
 133                     }
 134                 }
 135             }
 136             super.insertString(offs, str, a);
 137         }
 138     }
 139 }