Source Code Cross Referenced for SetTemplate.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:         * SetTemplate.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:  1.9
024:         * Created by suhler on 00/10/25
025:         * Last modified by suhler on 00/12/12 13:04:59
026:         */
027:
028:        package sunlabs.brazil.template;
029:
030:        import java.io.Serializable;
031:        import java.util.Dictionary;
032:        import java.util.Enumeration;
033:        import sunlabs.brazil.server.Handler;
034:        import sunlabs.brazil.server.Request.RechainableProperties;
035:        import sunlabs.brazil.server.Request;
036:        import sunlabs.brazil.server.Server;
037:        import sunlabs.brazil.session.SessionManager;
038:        import sunlabs.brazil.util.Format;
039:        import sunlabs.brazil.util.Glob;
040:
041:        /**
042:         * Template (and handler) class for Setting a value into the request props.
043:         * This class is used by the TemplateHandler.
044:         * <p>
045:         * The tag<code>&lt;set&gt;</code> is processed with the following
046:         * attributes:
047:         * <dl class=attributes>
048:         * <dt>name=<i>value</i>
049:         * <dd>The name of the entry to set in the request properties.
050:         * <dt>value=<i>value</i>
051:         * <dd>The value to set.  If no value is provided, any existing value 
052:         * is removed.
053:         * <dt>local
054:         * <dd>By default, variables are set (or removed from)
055:         * a namespace that is persistent across all requests for the same session.
056:         * if <b>local</b> is specified, the values only remain for the
057:         * duration of the current request.
058:         * </dl>
059:         * Request Properties:
060:         * <dl class=props>
061:         * <dt>sessionTable<dd>The name of the SessionManager table to use for
062:         *		storing values.  Defaults to the handler's prefix.
063:         * <dt>debug	<dd>If set, the original tag is included in a comment, 
064:         *		otherwise it is removed entirely.
065:         * <dt>mustMatch<dd>Set to a glob pattern that all names must match
066:         *		in order to be set.  This may be used to prevent malicious
067:         *		html pages (what a concept) from changing inappropriate
068:         *		values.
069:         * <dt>querySet<dd>If set, then properties may be set in query 
070:         *		   parameters, to the "handler" portion, but only
071:         *		   if they match the glob pattern.
072:         * </dl>
073:         * <p>
074:         * Normally, any persistent properties held by the SetTemplate are 
075:         * chained onto the request.props when the init method is found.  If this
076:         * template is installed as an up-stream handler, then the persistent
077:         * properties associated with the session are made available at that time.
078:         * <p>
079:         * When used as a handler, the following property is used:
080:         * <dl class=props>
081:         * <dt>session=<i>value</i>
082:         * <dd>The request property to find the session information in.
083:         *     Normally this should be the same as the session property used
084:         *     by the container calling this as a template.
085:         * </dl>
086:         * 
087:         * @author		Stephen Uhler
088:         * @version		%V% SetTemplate.java 1.9
089:         */
090:
091:        public class SetTemplate extends Template implements  Serializable,
092:                Handler {
093:            RechainableProperties props = null;
094:            transient boolean debug;
095:            String mustMatch;
096:            String prefix = null;
097:            String session;
098:            String sessionTable;
099:            String querySet;
100:
101:            /**
102:             * Chain our private properties into the request chain.
103:             */
104:
105:            public boolean init(RewriteContext hr) {
106:                debug = (hr.request.props.getProperty(hr.prefix + "debug") != null);
107:                mustMatch = hr.request.props.getProperty(hr.prefix
108:                        + "mustMatch");
109:                sessionTable = hr.request.props.getProperty(hr.prefix
110:                        + "sessionTable", hr.prefix);
111:                props = (RechainableProperties) SessionManager
112:                        .getSession(hr.sessionId, sessionTable,
113:                                RechainableProperties.class);
114:                if (prefix == null) {
115:                    insert(hr.request.props, props, hr.sessionId);
116:                }
117:                return true;
118:            }
119:
120:            /**
121:             * Set the value of a variable.  Allow variable substitutions in the name
122:             * and value.
123:             */
124:
125:            public void tag_set(RewriteContext hr) {
126:                if (debug) {
127:                    hr.append("<!-- " + hr.getBody() + " -->");
128:                }
129:                hr.killToken();
130:
131:                String name = Format.subst(hr.request.props, hr.get("name"));
132:                if (name == null) {
133:                    return;
134:                }
135:                if (mustMatch != null && !Glob.match(mustMatch, name)) {
136:                    hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix, name
137:                            + " doesn't match " + mustMatch);
138:                    return;
139:                }
140:                String value = Format.subst(hr.request.props, hr.get("value"));
141:                RechainableProperties p = (hr.get("local") == null) ? props
142:                        : hr.request.props;
143:
144:                if (value != null) {
145:                    p.put(name, value);
146:                    hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix, "putting "
147:                            + name + "=" + value + " to: " + p);
148:                } else {
149:                    p.remove(name);
150:                    hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix,
151:                            "removing " + name);
152:                }
153:            }
154:
155:            public boolean init(Server server, String prefix) {
156:                this .prefix = prefix;
157:                querySet = server.props.getProperty(prefix + "querySet");
158:                sessionTable = server.props.getProperty(
159:                        prefix + "sessionTable", prefix);
160:                session = server.props.getProperty(prefix + "session",
161:                        "SessionID");
162:                return true;
163:            }
164:
165:            /**
166:             * This is an experiment
167:             */
168:
169:            public boolean respond(Request request) {
170:                String id = request.props.getProperty(session);
171:                if (id != null) {
172:                    props = (RechainableProperties) SessionManager.getSession(
173:                            id, sessionTable, RechainableProperties.class);
174:                    insert(request.props, props, id);
175:                    request.log(Server.LOG_DIAGNOSTIC, prefix, "Chaining: "
176:                            + props);
177:                }
178:
179:                /*
180:                 * Set some properties as part of the request.
181:                 * Should they be persistent or not?
182:                 */
183:
184:                if (querySet != null) {
185:                    Dictionary h = request.getQueryData(null);
186:                    Enumeration keys = h.keys();
187:                    while (keys.hasMoreElements()) {
188:                        String key = (String) keys.nextElement();
189:                        if (Glob.match(querySet, key)) {
190:                            request.props.put(key, h.get(key));
191:                            // System.out.println("SET Setting: " + key + " -> " + h.get(key));
192:                        }
193:                    }
194:                }
195:                return false;
196:            }
197:
198:            /*
199:             * XXX temporary bug workaround.
200:             * We need to make sure the same table doesn't get chained twice,
201:             * or we'll end up with an infinite loop.
202:             */
203:
204:            static void insert(RechainableProperties root,
205:                    RechainableProperties add, String token) {
206:                if (add == null) {
207:                    return;
208:                }
209:                add.put(token, "OK");
210:                boolean ok = root.getProperty(token) == null;
211:                if (ok) {
212:                    // System.out.println("CHAINING " + add);
213:                    add.setDefaults(root.getDefaults());
214:                    root.setDefaults(add);
215:                } else {
216:                    // System.out.println("Already Chained: " + add);
217:                }
218:            }
219:        }
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