001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018
019 package validators;
020
021
022 import java.io.IOException;
023 import java.io.InputStream;
024
025 import javax.servlet.jsp.tagext.PageData;
026 import javax.servlet.jsp.tagext.TagLibraryValidator;
027 import javax.servlet.jsp.tagext.ValidationMessage;
028
029
030 /**
031 * Example tag library validator that simply dumps the XML version of each
032 * page to standard output (which will typically be sent to the file
033 * <code>$CATALINA_HOME/logs/catalina.out</code>). To utilize it, simply
034 * include a <code>taglib</code> directive for this tag library at the top
035 * of your JSP page.
036 *
037 * @author Craig McClanahan
038 * @version $Revision: 664175 $ $Date: 2008-06-06 18:43:44 -0400 (Fri, 06 Jun 2008) $
039 */
040
041 public class DebugValidator extends TagLibraryValidator {
042
043 // ----------------------------------------------------- Instance Variables
044
045 // --------------------------------------------------------- Public Methods
046
047
048 /**
049 * Validate a JSP page. This will get invoked once per directive in the
050 * JSP page. This method will return <code>null</code> if the page is
051 * valid; otherwise the method should return an array of
052 * <code>ValidationMessage</code> objects. An array of length zero is
053 * also interpreted as no errors.
054 *
055 * @param prefix The value of the prefix argument in this directive
056 * @param uri The value of the URI argument in this directive
057 * @param page The page data for this page
058 */
059 public ValidationMessage[] validate(String prefix, String uri,
060 PageData page) {
061
062 System.out.println("---------- Prefix=" + prefix + " URI=" + uri +
063 "----------");
064
065 InputStream is = page.getInputStream();
066 while (true) {
067 try {
068 int ch = is.read();
069 if (ch < 0)
070 break;
071 System.out.print((char) ch);
072 } catch (IOException e) {
073 break;
074 }
075 }
076 System.out.println();
077 System.out.println("-----------------------------------------------");
078 return (null);
079
080 }
081
082
083 }