001    /*
002    * Copyright 2004 The Apache Software Foundation
003    *
004    * Licensed under the Apache License, Version 2.0 (the "License");
005    * you may not use this file except in compliance with the License.
006    * You may obtain a copy of the License at
007    *
008    *     http://www.apache.org/licenses/LICENSE-2.0
009    *
010    * Unless required by applicable law or agreed to in writing, software
011    * distributed under the License is distributed on an "AS IS" BASIS,
012    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013    * See the License for the specific language governing permissions and
014    * limitations under the License.
015    */
016    
017    
018    package validators;
019    
020    
021    import java.io.InputStream;
022    import java.io.IOException;
023    import javax.servlet.jsp.tagext.PageData;
024    import javax.servlet.jsp.tagext.TagLibraryValidator;
025    import javax.servlet.jsp.tagext.ValidationMessage;
026    
027    
028    /**
029     * Example tag library validator that simply dumps the XML version of each
030     * page to standard output (which will typically be sent to the file
031     * <code>$CATALINA_HOME/logs/catalina.out</code>).  To utilize it, simply
032     * include a <code>taglib</code> directive for this tag library at the top
033     * of your JSP page.
034     *
035     * @author Craig McClanahan
036     * @version $Revision: 267129 $ $Date: 2004-03-18 08:40:35 -0800 (Thu, 18 Mar 2004) $
037     */
038    
039    public class DebugValidator extends TagLibraryValidator {
040    
041    
042        // ----------------------------------------------------- Instance Variables
043    
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    }