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Java > Open Source Codes > org > apache > tapestry > form > validator > Email


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.form.validator;
16
17 import org.apache.tapestry.IMarkupWriter;
18 import org.apache.tapestry.IRequestCycle;
19 import org.apache.tapestry.form.FormComponentContributorContext;
20 import org.apache.tapestry.form.IFormComponent;
21 import org.apache.tapestry.form.ValidationMessages;
22 import org.apache.tapestry.util.RegexpMatcher;
23 import org.apache.tapestry.valid.ValidationConstraint;
24 import org.apache.tapestry.valid.ValidationStrings;
25 import org.apache.tapestry.valid.ValidatorException;
26
27 /**
28  * Validates that the user input, a string, is an email address (by checking it against a regular
29  * expression).
30  *
31  * @author Howard Lewis Ship
32  * @since 4.0
33  */
34 public class Email extends BaseValidator
35 {
36     static final String JavaDoc PATTERN = "^\\w[-._\\w]*\\w@\\w[-._\\w]*\\w\\.\\w{2,3}$";
37
38     // TODO: Possible thread safety issue if the validator
39 // is shared across threads, because the matcher
40 // will be too.
41 private RegexpMatcher _matcher = new RegexpMatcher();
42
43     public Email()
44     {
45     }
46
47     public Email(String JavaDoc initializer)
48     {
49         super(initializer);
50     }
51
52     public void validate(IFormComponent field, ValidationMessages messages, Object JavaDoc object)
53             throws ValidatorException
54     {
55         String JavaDoc input = (String JavaDoc) object;
56
57         if (!_matcher.matches(PATTERN, input))
58             throw new ValidatorException(buildMessage(messages, field),
59                     ValidationConstraint.EMAIL_FORMAT);
60     }
61
62     private String JavaDoc buildMessage(ValidationMessages messages, IFormComponent field)
63     {
64         return messages.formatValidationMessage(
65                 getMessage(),
66                 ValidationStrings.INVALID_EMAIL,
67                 new Object JavaDoc[]
68                 { field.getDisplayName() });
69     }
70
71     public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
72             FormComponentContributorContext context, IFormComponent field)
73     {
74         context.includeClasspathScript("/org/apache/tapestry/form/validator/RegExValidator.js");
75
76         String JavaDoc pattern = _matcher.getEscapedPatternString(PATTERN);
77         String JavaDoc message = buildMessage(context, field);
78
79         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc("function(event) { validate_regexp(event, ");
80         buffer.append(context.getFieldDOM());
81         buffer.append(", '");
82         buffer.append(pattern);
83         buffer.append("', '");
84         buffer.append(message);
85         buffer.append("'); }");
86
87         context.addSubmitListener(buffer.toString());
88     }
89 }
90
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