Source Code Cross Referenced for ModifiedTemplate.java in  » Web-Server » Brazil » sunlabs » brazil » template » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Brazil » sunlabs.brazil.template 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ModifiedTemplate.java
003:         *
004:         * Brazil project web application Framework,
005:         * export version: 1.1 
006:         * Copyright (c) 2000 Sun Microsystems, Inc.
007:         *
008:         * Sun Public License Notice
009:         *
010:         * The contents of this file are subject to the Sun Public License Version 
011:         * 1.0 (the "License"). You may not use this file except in compliance with 
012:         * the License. A copy of the License is included as the file "license.terms",
013:         * and also available at http://www.sun.com/
014:         * 
015:         * The Original Code is from:
016:         *    Brazil project web application Framework release 1.1.
017:         * The Initial Developer of the Original Code is: suhler.
018:         * Portions created by suhler are Copyright (C) Sun Microsystems, Inc.
019:         * All Rights Reserved.
020:         * 
021:         * Contributor(s): suhler.
022:         *
023:         * Version:  1.3
024:         * Created by suhler on 00/11/19
025:         * Last modified by suhler on 00/12/11 13:31:16
026:         */
027:
028:        package sunlabs.brazil.template;
029:
030:        import sunlabs.brazil.util.http.HttpUtil;
031:        import sunlabs.brazil.server.Server;
032:        import java.io.Serializable;
033:
034:        /**
035:         * Template class for computing <code>last-modified</code> times
036:         * for content that is processed through templates.
037:         * <p>
038:         * For traditional web content that is stored in a file, it is easy to
039:         * keep track of the last time the content changed, simply by looking at the
040:         * modify-time attribute of the file.  Many browsers (and caches) use
041:         * this information, 
042:         * obtained from the <code>last-modified</code> http header to determine 
043:         * whether to use an existing copy of the document, or a cached copy.
044:         * <p>
045:         * When the content is dynamically transformed, however, the last modified
046:         * time is more complex: a combination of the original file modification
047:         * time combined with the last change made to the transformation 
048:         * parameters.
049:         * <p>
050:         * A new HTML tag,  
051:         * <code>&lt;modified&gt;</code> is defined, and is intended to be
052:         * used in conjunction with the BSLTemplate.  When present in a 
053:         * page, the <code>last-modified</code> time of the transformation
054:         * is set to the server's current time.  When the content is delivered
055:         * to the client, the <code>last-modified</code> header is set to the
056:         * more recent of the origin last-modified time and the transformation
057:         * modified time.
058:         * <p>
059:         * Properties:
060:         * <dl class=props>
061:         * <dt> debug
062:         * <dd> If this configuration parameter is present, <code>modified</code>
063:         * tag is replaced by a comment.  Otherwise it is removed from the document.
064:         * </dl>
065:         *
066:         * @author		Stephen Uhler
067:         * @version		%V% 00/12/11
068:         */
069:
070:        public class ModifiedTemplate extends Template implements  Serializable {
071:
072:            private static final String DEBUG = "debug";
073:            transient boolean debug;
074:            long modified = 0; // last modified time of session transformation
075:
076:            public boolean init(RewriteContext hr) {
077:                debug = (hr.request.props.getProperty(hr.prefix + DEBUG) != null);
078:                return true;
079:            }
080:
081:            /**
082:             * Set the content transformation modifiy time to NOW
083:             */
084:
085:            public void tag_modified(RewriteContext hr) {
086:                modified = hr.request.startMillis;
087:                hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix
088:                        + "setting transform modified time: " + modified);
089:                hr.killToken();
090:                if (debug) {
091:                    hr.append("<!-- " + hr.getBody() + " -->");
092:                }
093:            }
094:
095:            /**
096:             * Compute the http last modified value by comparing the origin
097:             * last-modified value (if any) with the transform value
098:             */
099:
100:            public boolean done(RewriteContext hr) {
101:                if (modified == 0) {
102:                    modified = hr.request.startMillis;
103:                }
104:                /*
105:
106:                 * Find the last-mod time from the origin document.  Look
107:                 * in the request props first.
108:                 */
109:
110:                long originTime;
111:                String propsTime = hr.request.props.getProperty("lastModified");
112:                if (propsTime == null) {
113:                    originTime = HttpUtil.parseTime(hr.request.responseHeaders
114:                            .get("last-modified"));
115:                } else {
116:                    originTime = Long.parseLong(propsTime);
117:                }
118:
119:                /*
120:                 * Muck with the last-modified header, only if we need to
121:                 */
122:
123:                if (originTime < modified) {
124:                    hr.request.responseHeaders.remove("last-modified");
125:                    hr.request.addHeader("Last-Modified", HttpUtil
126:                            .formatTime(modified));
127:                    hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix
128:                            + "Adjusting mod time: " + originTime + " -> "
129:                            + modified);
130:                }
131:
132:                return true;
133:            }
134:        }
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