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.InputStream;
023    import java.io.IOException;
024    import javax.servlet.jsp.tagext.PageData;
025    import javax.servlet.jsp.tagext.TagLibraryValidator;
026    import javax.servlet.jsp.tagext.ValidationMessage;
027    
028    
029    /**
030     * Example tag library validator that simply dumps the XML version of each
031     * page to standard output (which will typically be sent to the file
032     * <code>$CATALINA_HOME/logs/catalina.out</code>).  To utilize it, simply
033     * include a <code>taglib</code> directive for this tag library at the top
034     * of your JSP page.
035     *
036     * @author Craig McClanahan
037     * @version $Revision: 514091 $ $Date: 2007-03-03 01:26:39 -0500 (Sat, 03 Mar 2007) $
038     */
039    
040    public class DebugValidator extends TagLibraryValidator {
041    
042    
043        // ----------------------------------------------------- Instance Variables
044    
045    
046        // --------------------------------------------------------- Public Methods
047    
048    
049        /**
050         * Validate a JSP page.  This will get invoked once per directive in the
051         * JSP page.  This method will return <code>null</code> if the page is
052         * valid; otherwise the method should return an array of
053         * <code>ValidationMessage</code> objects.  An array of length zero is
054         * also interpreted as no errors.
055         *
056         * @param prefix The value of the prefix argument in this directive
057         * @param uri The value of the URI argument in this directive
058         * @param page The page data for this page
059         */
060        public ValidationMessage[] validate(String prefix, String uri,
061                                            PageData page) {
062    
063            System.out.println("---------- Prefix=" + prefix + " URI=" + uri +
064                               "----------");
065    
066            InputStream is = page.getInputStream();
067            while (true) {
068                try {
069                    int ch = is.read();
070                    if (ch < 0)
071                        break;
072                    System.out.print((char) ch);
073                } catch (IOException e) {
074                    break;
075                }
076            }
077            System.out.println();
078            System.out.println("-----------------------------------------------");
079            return (null);
080    
081        }
082    
083    
084    }