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


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.hivemind.util.PropertyUtils;
18 import org.apache.tapestry.IMarkupWriter;
19 import org.apache.tapestry.IRequestCycle;
20 import org.apache.tapestry.form.FormComponentContributorContext;
21 import org.apache.tapestry.form.IFormComponent;
22 import org.apache.tapestry.form.ValidationMessages;
23 import org.apache.tapestry.valid.ValidationConstraint;
24 import org.apache.tapestry.valid.ValidationStrings;
25 import org.apache.tapestry.valid.ValidatorException;
26
27 /**
28  * Expects the object to be a number, and checks that the value not smaller than a specified value.
29  *
30  * @author Howard Lewis Ship
31  * @since 4.0
32  */
33 public class Min extends BaseValidator
34 {
35     private double _min;
36
37     public Min()
38     {
39     }
40
41     public Min(String JavaDoc initializer)
42     {
43         super(initializer);
44     }
45
46     /**
47      * Does comparison based on the {@link Number#doubleValue()}.
48      */
49
50     public void validate(IFormComponent field, ValidationMessages messages, Object JavaDoc object)
51             throws ValidatorException
52     {
53         Number JavaDoc value = (Number JavaDoc) object;
54
55         if (_min > value.doubleValue())
56             throw new ValidatorException(buildMessage(messages, field),
57                     ValidationConstraint.TOO_SMALL);
58     }
59
60     private String JavaDoc buildMessage(ValidationMessages messages, IFormComponent field)
61     {
62         return messages.formatValidationMessage(
63                 getMessage(),
64                 ValidationStrings.VALUE_TOO_SMALL,
65                 new Object JavaDoc[]
66                 { field.getDisplayName(), new Double JavaDoc(_min) });
67     }
68
69     public void renderContribution(IMarkupWriter writer, IRequestCycle cycle,
70             FormComponentContributorContext context, IFormComponent field)
71     {
72         context.includeClasspathScript("/org/apache/tapestry/form/validator/NumberValidator.js");
73
74         String JavaDoc message = buildMessage(context, field);
75
76         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc("function(event) { validate_min_number(event, ");
77         buffer.append(context.getFieldDOM());
78         buffer.append(", ");
79         buffer.append(_min);
80         buffer.append(", '");
81         buffer.append(message);
82         buffer.append("'); }");
83
84         context.addSubmitListener(buffer.toString());
85     }
86
87     public void setMin(double min)
88     {
89         _min = min;
90     }
91
92 }
93
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