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Java > Open Source Codes > validators > DebugValidator


1 /*
2 * Copyright 2004 The Apache Software Foundation
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18 package validators;
19
20
21 import java.io.InputStream JavaDoc;
22 import java.io.IOException JavaDoc;
23 import javax.servlet.jsp.tagext.PageData JavaDoc;
24 import javax.servlet.jsp.tagext.TagLibraryValidator JavaDoc;
25 import javax.servlet.jsp.tagext.ValidationMessage JavaDoc;
26
27
28 /**
29  * Example tag library validator that simply dumps the XML version of each
30  * page to standard output (which will typically be sent to the file
31  * <code>$CATALINA_HOME/logs/catalina.out</code>). To utilize it, simply
32  * include a <code>taglib</code> directive for this tag library at the top
33  * of your JSP page.
34  *
35  * @author Craig McClanahan
36  * @version $Revision: 1.1 $ $Date: 2004/06/24 11:40:41 $
37  */
38
39 public class DebugValidator extends TagLibraryValidator JavaDoc {
40
41
42     // ----------------------------------------------------- Instance Variables
43
44
45     // --------------------------------------------------------- Public Methods
46
47
48     /**
49      * Validate a JSP page. This will get invoked once per directive in the
50      * JSP page. This method will return <code>null</code> if the page is
51      * valid; otherwise the method should return an array of
52      * <code>ValidationMessage</code> objects. An array of length zero is
53      * also interpreted as no errors.
54      *
55      * @param prefix The value of the prefix argument in this directive
56      * @param uri The value of the URI argument in this directive
57      * @param page The page data for this page
58      */
59     public ValidationMessage JavaDoc[] validate(String JavaDoc prefix, String JavaDoc uri,
60                                         PageData JavaDoc page) {
61
62         System.out.println("---------- Prefix=" + prefix + " URI=" + uri +
63                            "----------");
64
65         InputStream JavaDoc is = page.getInputStream();
66         while (true) {
67             try {
68                 int ch = is.read();
69                 if (ch < 0)
70                     break;
71                 System.out.print((char) ch);
72             } catch (IOException JavaDoc e) {
73                 break;
74             }
75         }
76         System.out.println();
77         System.out.println("-----------------------------------------------");
78         return (null);
79
80     }
81
82
83 }
84
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