1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18
19 package validators;
20
21
22 import java.io.IOException;
23 import java.io.InputStream;
24
25 import javax.servlet.jsp.tagext.PageData;
26 import javax.servlet.jsp.tagext.TagLibraryValidator;
27 import javax.servlet.jsp.tagext.ValidationMessage;
28
29
30 /**
31 * Example tag library validator that simply dumps the XML version of each
32 * page to standard output (which will typically be sent to the file
33 * <code>$CATALINA_HOME/logs/catalina.out</code>). To utilize it, simply
34 * include a <code>taglib</code> directive for this tag library at the top
35 * of your JSP page.
36 *
37 * @author Craig McClanahan
38 * @version $Revision: 664175 $ $Date: 2008-06-06 18:43:44 -0400 (Fri, 06 Jun 2008) $
39 */
40
41 public class DebugValidator extends TagLibraryValidator {
42
43 // ----------------------------------------------------- Instance Variables
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[] validate(String prefix, String uri,
60 PageData page) {
61
62 System.out.println("---------- Prefix=" + prefix + " URI=" + uri +
63 "----------");
64
65 InputStream 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 e) {
73 break;
74 }
75 }
76 System.out.println();
77 System.out.println("-----------------------------------------------");
78 return (null);
79
80 }
81
82
83 }