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Java > Open Source Codes > com > izforge > izpack > sample > IPValidator


1 /*
2  * IzPack - Copyright 2001-2005 Julien Ponge, All Rights Reserved.
3  *
4  * http://www.izforge.com/izpack/
5  * http://developer.berlios.de/projects/izpack/
6  *
7  * Copyright 2003 Elmar Grom
8  *
9  * Licensed under the Apache License, Version 2.0 (the "License");
10  * you may not use this file except in compliance with the License.
11  * You may obtain a copy of the License at
12  *
13  * http://www.apache.org/licenses/LICENSE-2.0
14  *
15  * Unless required by applicable law or agreed to in writing, software
16  * distributed under the License is distributed on an "AS IS" BASIS,
17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18  * See the License for the specific language governing permissions and
19  * limitations under the License.
20  */

21
22 package com.izforge.izpack.sample;
23
24 import com.izforge.izpack.panels.*;
25
26 /*---------------------------------------------------------------------------*/
27 /**
28  * This class represents a simple validator for IP addresses to demonstrate
29  * the implementation of a rule validator that cooperates with the
30  * <code>RuleInputField</code> used in the <code>UserInputPanel</code>
31  *
32  * @version 0.0.1 / 02/19/03
33  * @author Elmar Grom
34  */

35 /*---------------------------------------------------------------------------*/
36 public class IPValidator implements Validator
37 {
38  /*--------------------------------------------------------------------------*/
39  /**
40   * Validates the contend of a <code>RuleInputField</code>. The test is
41   * intended for a rule input field composed of four sub-fields. The
42   * combination of their individual content is assumed to represent an IP
43   * address.
44   *
45   * @param client the client object using the services of this validator.
46   *
47   * @return <code>true</code> if the validation passes, otherwise <code>false</code>.
48   */

49  /*--------------------------------------------------------------------------*/
50   public boolean validate (ProcessingClient client)
51   {
52     // ----------------------------------------------------
53
// verify that there are actually four sub-fields. A
54
// different number would indicate that we are not
55
// connected with the RuleInputField that we expect
56
// ----------------------------------------------------
57
if (client.getNumFields () != 4)
58     {
59       return (false);
60     }
61     
62     // ----------------------------------------------------
63
// test each field to make sure it actually contains
64
// an integer and the value of the integer is beween
65
// 0 and 255.
66
// ----------------------------------------------------
67
boolean isIP = true;
68     
69     for (int i = 0; i < 4; i++)
70     {
71       int value;
72       
73       try
74       {
75         value = Integer.parseInt (client.getFieldContents (i));
76         if ((value < 0) || (value > 255))
77         {
78           isIP = false;
79         }
80       }
81       catch (Throwable JavaDoc exception)
82       {
83         isIP = false;
84       }
85     }
86     
87     return (isIP);
88   }
89 }
90 /*---------------------------------------------------------------------------*/
91
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