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


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.valid.ValidationConstraint;
23 import org.apache.tapestry.valid.ValidationStrings;
24 import org.apache.tapestry.valid.ValidatorException;
25
26 /**
27  * Validator that ensures a string value does not exceed a maximum length.
28  *
29  * @author Howard Lewis Ship
30  * @since 4.0
31  */
32 public class MaxLength extends BaseValidator
33 {
34     private int _maxLength;
35
36     public MaxLength()
37     {
38
39     }
40
41     public MaxLength(String JavaDoc initializer)
42     {
43         super(initializer);
44     }
45
46     public void setMaxLength(int maxLength)
47     {
48         _maxLength = maxLength;
49     }
50
51     public void validate(IFormComponent field, ValidationMessages messages, Object JavaDoc object)
52             throws ValidatorException
53     {
54         String JavaDoc string = (String JavaDoc) object;
55
56         if (string.length() > _maxLength)
57             throw new ValidatorException(buildMessage(messages, field),
58                     ValidationConstraint.MAXIMUM_WIDTH);
59     }
60
61     protected String JavaDoc buildMessage(ValidationMessages messages, IFormComponent field)
62     {
63         return messages.formatValidationMessage(
64                 getMessage(),
65                 ValidationStrings.VALUE_TOO_LONG,
66                 new Object JavaDoc[]
67                 { new Integer JavaDoc(_maxLength), field.getDisplayName() });
68     }
69
70     public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
71             FormComponentContributorContext context, IFormComponent field)
72     {
73         context.includeClasspathScript("/org/apache/tapestry/form/validator/StringValidator.js");
74         
75         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc("function(event) { validate_max_length(event, ");
76         buffer.append(context.getFieldDOM());
77         buffer.append(", ");
78         buffer.append(_maxLength);
79         buffer.append(", '");
80         buffer.append(buildMessage(context, field));
81         buffer.append("'); }");
82
83         context.addSubmitListener(buffer.toString());
84     }
85
86 }
87
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