001: /*
002: * $Header: /home/cvs/jakarta-tomcat-4.0/webapps/examples/WEB-INF/classes/validators/DebugValidator.java,v 1.1 2001/09/05 05:14:01 craigmcc Exp $
003: * $Revision: 1.1 $
004: * $Date: 2001/09/05 05:14:01 $
005: *
006: * ====================================================================
007: *
008: * The Apache Software License, Version 1.1
009: *
010: * Copyright (c) 1999-2001 The Apache Software Foundation. All rights
011: * reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions
015: * are met:
016: *
017: * 1. Redistributions of source code must retain the above copyright
018: * notice, this list of conditions and the following disclaimer.
019: *
020: * 2. Redistributions in binary form must reproduce the above copyright
021: * notice, this list of conditions and the following disclaimer in
022: * the documentation and/or other materials provided with the
023: * distribution.
024: *
025: * 3. The end-user documentation included with the redistribution, if
026: * any, must include the following acknowlegement:
027: * "This product includes software developed by the
028: * Apache Software Foundation (http://www.apache.org/)."
029: * Alternately, this acknowlegement may appear in the software itself,
030: * if and wherever such third-party acknowlegements normally appear.
031: *
032: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033: * Foundation" must not be used to endorse or promote products derived
034: * from this software without prior written permission. For written
035: * permission, please contact apache@apache.org.
036: *
037: * 5. Products derived from this software may not be called "Apache"
038: * nor may "Apache" appear in their names without prior written
039: * permission of the Apache Group.
040: *
041: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052: * SUCH DAMAGE.
053: * ====================================================================
054: *
055: * This software consists of voluntary contributions made by many
056: * individuals on behalf of the Apache Software Foundation. For more
057: * information on the Apache Software Foundation, please see
058: * <http://www.apache.org/>.
059: *
060: * [Additional notices, if required by prior licensing conditions]
061: *
062: */
063:
064: package validators;
065:
066: import java.io.InputStream;
067: import java.io.IOException;
068: import javax.servlet.jsp.tagext.PageData;
069: import javax.servlet.jsp.tagext.TagLibraryValidator;
070: import javax.servlet.jsp.tagext.ValidationMessage;
071:
072: /**
073: * Example tag library validator that simply dumps the XML version of each
074: * page to standard output (which will typically be sent to the file
075: * <code>$CATALINA_HOME/logs/catalina.out</code>). To utilize it, simply
076: * include a <code>taglib</code> directive for this tag library at the top
077: * of your JSP page.
078: *
079: * @author Craig McClanahan
080: * @version $Revision: 1.1 $ $Date: 2001/09/05 05:14:01 $
081: */
082:
083: public class DebugValidator extends TagLibraryValidator {
084:
085: // ----------------------------------------------------- Instance Variables
086:
087: // --------------------------------------------------------- Public Methods
088:
089: /**
090: * Validate a JSP page. This will get invoked once per directive in the
091: * JSP page. This method will return <code>null</code> if the page is
092: * valid; otherwise the method should return an array of
093: * <code>ValidationMessage</code> objects. An array of length zero is
094: * also interpreted as no errors.
095: *
096: * @param prefix The value of the prefix argument in this directive
097: * @param uri The value of the URI argument in this directive
098: * @param page The page data for this page
099: */
100: public ValidationMessage[] validate(String prefix, String uri,
101: PageData page) {
102:
103: System.out.println("---------- Prefix=" + prefix + " URI="
104: + uri + "----------");
105:
106: InputStream is = page.getInputStream();
107: while (true) {
108: try {
109: int ch = is.read();
110: if (ch < 0)
111: break;
112: System.out.print((char) ch);
113: } catch (IOException e) {
114: break;
115: }
116: }
117: System.out.println();
118: System.out
119: .println("-----------------------------------------------");
120: return (null);
121:
122: }
123:
124: }
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