EmailTypeValidator


1   /*
2    * Copyright (c) 2003, Inversoft
3    *
4    * This software is distribuable under the GNU Lesser General Public License.
5    * For more information visit gnu.org.
6    */
7   package com.inversoft.util.typevalidator;
8   
9   
10  import java.util.Locale  ;
11  
12  
13  /**
14   * <p>
15   * This class validates email addresses
16   * </p>
17   * 
18   * @author  bpontarelli
19   * @version 2.0
20   * @since   2.0
21   */
22  public class EmailTypeValidator extends BaseTypeValidator {
23  
24      /**
25       * Default error message returned from validate methods (inside Basic and
26       * PropertyError objects)
27       */
28      public static final String   DEFAULT_MESSAGE = "Invalid email address";
29  
30  
31      /**
32       * Constructs a new <code>EmailTypeValidator</code>
33       */
34      public EmailTypeValidator() {
35          // Empty
36      }
37  
38  
39      /**
40       * Does the work of validating the email address
41       * 
42       * @param   value The email address to validate
43       * @param   params Not used
44       * @param   message The error message to use
45       * @param   locale Not used
46       * @param   mesgParams Parameters used to format the error message
47       * @return  The error message if the validation failed, otherwise null
48       */
49      protected String   internalValidate(Object   value, Object   params, String   message,
50              Locale   locale, Object  [] mesgParams) {
51          String   localEmail = value.toString().trim();
52          int at = localEmail.indexOf("@");
53          int space = localEmail.indexOf(" ");
54          boolean valid = (at != -1 && at != 0 && 
55              at != (localEmail.length() - 1) && space == -1);
56          if (valid) {
57              valid = (localEmail.indexOf("@", at + 1) == -1); 
58          }
59  
60          String   error = null;
61          if (!valid) {
62              error = getErrorMessage(message, DEFAULT_MESSAGE, mesgParams);
63          }
64  
65          return error;
66      }
67  }
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