Source Code Cross Referenced for JigsawHttpSession.java in  » Web-Server » Jigsaw » org » w3c » jigsaw » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Jigsaw » org.w3c.jigsaw.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // JigsawHttpSession.java
002:        // $Id: JigsawHttpSession.java,v 1.11 2007/02/11 10:55:20 ylafon Exp $
003:        // (c) COPYRIGHT MIT and INRIA, 1998.
004:        // Please first read the full copyright statement in file COPYRIGHT.html
005:
006:        package org.w3c.jigsaw.servlet;
007:
008:        import javax.servlet.ServletContext;
009:
010:        import javax.servlet.http.Cookie;
011:        import javax.servlet.http.HttpSession;
012:        import javax.servlet.http.HttpSessionBindingEvent;
013:        import javax.servlet.http.HttpSessionBindingListener;
014:        import javax.servlet.http.HttpSessionContext;
015:
016:        import java.util.Enumeration;
017:        import java.util.Hashtable;
018:
019:        import org.w3c.util.ArrayEnumeration;
020:
021:        /**
022:         * @version $Revision: 1.11 $
023:         * @author  Benoît Mahé (bmahe@w3.org)
024:         */
025:        public class JigsawHttpSession implements  HttpSession {
026:
027:            private JigsawHttpSessionContext sc = null;
028:
029:            private JigsawServletContext servletContext = null;
030:
031:            private String id = null;
032:
033:            private long creationTime = -1;
034:            private long lastAccessedTime = -1;
035:
036:            private boolean isValid = false;
037:            private boolean isNew = false;
038:
039:            private Cookie cookie = null;
040:
041:            private Hashtable values = null;
042:
043:            private int maxidle = -1;
044:
045:            /**
046:             * Returns the identifier assigned to this session. An HttpSession's 
047:             * identifier is a unique string that is created and maintained by
048:             * HttpSessionContext. 
049:             * @return the identifier assigned to this session 
050:             * @exception IllegalStateException if an attempt is made to access 
051:             * session data after the session has been invalidated 
052:             */
053:            public String getId() {
054:                return id;
055:            }
056:
057:            /**
058:             * Returns the context in which this session is bound. 
059:             * @return the context in which this session is bound.
060:             * @exception IllegalStateException if an attempt is made to access 
061:             * session data after the session has been invalidated 
062:             * @deprecated since jsdk2.1
063:             */
064:            public HttpSessionContext getSessionContext() {
065:                return sc;
066:            }
067:
068:            /**
069:             * Returns the object bound with the specified name in this session, or
070:             * <code>null</code> if no object is bound under the name.
071:             * @param name a string specifying the name of the object
072:             * @return the object with the specified name
073:             * @exception IllegalStateException	if this method is called on an
074:             *					invalidated session
075:             */
076:            public Object getAttribute(String name) {
077:                return getValue(name);
078:            }
079:
080:            /**
081:             * Returns an <code>Enumeration</code> of <code>String</code> objects
082:             * containing the names of all the objects bound to this session. 
083:             * @return an <code>Enumeration</code> of <code>String</code> objects 
084:             * specifying the names of all the objects bound to	this session
085:             * @exception IllegalStateException	if this method is called on an
086:             *					invalidated session
087:             */
088:            public Enumeration getAttributeNames() {
089:                if (!isValid)
090:                    throw new IllegalStateException("Invalid session");
091:                return values.keys();
092:            }
093:
094:            /**
095:             * Binds an object to this session, using the name specified.
096:             * If an object of the same name is already bound to the session,
097:             * the object is replaced.
098:             *
099:             * <p>After this method executes, and if the object
100:             * implements <code>HttpSessionBindingListener</code>,
101:             * the container calls 
102:             * <code>HttpSessionBindingListener.valueBound</code>.
103:             *
104:             * @param name the name to which the object is bound; cannot be null
105:             * @param value the object to be bound; cannot be null
106:             * @exception IllegalStateException	if this method is called on an
107:             *					invalidated session
108:             */
109:
110:            public void setAttribute(String name, Object value) {
111:                putValue(name, value);
112:            }
113:
114:            /**
115:             * Removes the object bound with the specified name from
116:             * this session. If the session does not have an object
117:             * bound with the specified name, this method does nothing.
118:             *
119:             * <p>After this method executes, and if the object
120:             * implements <code>HttpSessionBindingListener</code>,
121:             * the container calls 
122:             * <code>HttpSessionBindingListener.valueUnbound</code>.
123:             * 
124:             * @param name the name of the object to remove from this session
125:             * @exception IllegalStateException	if this method is called on an
126:             *					invalidated session
127:             */
128:            public void removeAttribute(String name) {
129:                removeValue(name);
130:            }
131:
132:            /**
133:             * Returns the time at which this session representation was created, 
134:             * in milliseconds since midnight, January 1, 1970 UTC. 
135:             * @return the time when the session was created 
136:             * @exception IllegalStateException if an attempt is made to access 
137:             * session data after the session has been invalidated 
138:             */
139:            public long getCreationTime() {
140:                return creationTime;
141:            }
142:
143:            /**
144:             * Returns the last time the client sent a request carrying the identifier
145:             * assigned to the session. Time is expressed as milliseconds
146:             * since midnight, January 1, 1970 UTC. Application level operations, 
147:             * such as getting or setting a value associated with the session,
148:             * does not affect the access time. 
149:             * @return the last time the client sent a request carrying the identifier
150:             * assigned to the session 
151:             * @exception IllegalStateException if an attempt is made to access 
152:             * session data after the session has been invalidated 
153:             */
154:            public long getLastAccessedTime() {
155:                return lastAccessedTime;
156:            }
157:
158:            protected void setLastAccessedTime() {
159:                lastAccessedTime = System.currentTimeMillis();
160:            }
161:
162:            /**
163:             * Causes this representation of the session to be invalidated and removed
164:             * from its context. 
165:             * @exception IllegalStateException if an attempt is made to access 
166:             * session data after the session has been invalidated 
167:             */
168:            public void invalidate() {
169:                // adding unbinding events during invalidate() in accordance 
170:                // with servlet api, tk, 23.10.2001
171:                // start of modification        
172:                Enumeration names = values.keys();
173:                while (names.hasMoreElements()) {
174:                    String name = (String) (names.nextElement());
175:                    removeValue(name);
176:                }
177:                // end of modification
178:
179:                isValid = false;
180:                sc.removeSession(id);
181:            }
182:
183:            /**
184:             * Returns the object bound to the given name in the session's application
185:             * layer data. Returns null if there is no such binding. 
186:             * @param name - the name of the binding to find 
187:             * @return the value bound to that name, or null if the binding does 
188:             * not exist. 
189:             * @exception IllegalStateException if an attempt is made to access 
190:             * session data after the session has been invalidated 
191:             */
192:            public Object getValue(String name) {
193:                if (!isValid)
194:                    throw new IllegalStateException("Invalid session");
195:                return values.get(name);
196:            }
197:
198:            /**
199:             * Binds the specified object into the session's application layer data 
200:             * with the given name. Any existing binding with the same name
201:             * is replaced. New (or existing) values that implement the 
202:             * HttpSessionBindingListener interface will call its valueBound() method. 
203:             * @param name - the name to which the data object will be bound. 
204:             * This parameter cannot be null. 
205:             * @param value - the data object to be bound. This parameter cannot 
206:             * be null. 
207:             * @exception IllegalStateException if an attempt is made to access 
208:             * session data after the session has been invalidated 
209:             */
210:            public void putValue(String name, Object value) {
211:                if (!isValid)
212:                    throw new IllegalStateException("Invalid session");
213:                removeValue(name);
214:                // null check added in accordance with servlet api, tk. 23.10.2001
215:                if (value != null) {
216:                    values.put(name, value);
217:                    if (value instanceof  HttpSessionBindingListener)
218:                        valueBound((HttpSessionBindingListener) value, name);
219:                }
220:            }
221:
222:            /**
223:             * Removes the object bound to the given name in the session's application
224:             * layer data. Does nothing if there is no object bound to the
225:             * given name. The value that implements the HttpSessionBindingListener 
226:             * interface will call its valueUnbound() method. 
227:             * @param name - the name of the object to remove 
228:             * @exception IllegalStateException if an attempt is made to access 
229:             * session data after the session has been invalidated 
230:             */
231:            public void removeValue(String name) {
232:                if (!isValid)
233:                    throw new IllegalStateException("Invalid session");
234:                Object value = values.get(name);
235:                if (value != null) {
236:                    values.remove(name);
237:                    if (value instanceof  HttpSessionBindingListener)
238:                        valueUnbound((HttpSessionBindingListener) value, name);
239:                }
240:            }
241:
242:            protected void valueBound(HttpSessionBindingListener value,
243:                    String name) {
244:                value.valueBound(new HttpSessionBindingEvent(this , name));
245:            }
246:
247:            protected void valueUnbound(HttpSessionBindingListener value,
248:                    String name) {
249:                value.valueUnbound(new HttpSessionBindingEvent(this , name));
250:            }
251:
252:            /**
253:             * Returns an array of the names of all the application layer data objects
254:             * bound into the session. For example, if you want to delete
255:             * all of the data objects bound into the session, use this method to 
256:             * obtain their names. 
257:             * @return an array containing the names of all of the application layer
258:             * data objects bound into the session 
259:             * @exception IllegalStateException if an attempt is made to access 
260:             * session data after the session has been invalidated 
261:             * @deprecated since jsdk2.2
262:             */
263:            public String[] getValueNames() {
264:                if (!isValid)
265:                    throw new IllegalStateException("Invalid session");
266:                String names[] = new String[values.size()];
267:                Enumeration e = values.keys();
268:                int i = 0;
269:                while (e.hasMoreElements()) {
270:                    names[i++] = (String) e.nextElement();
271:                }
272:                return names;
273:            }
274:
275:            /**
276:             * A session is considered to be "new" if it has been created by the 
277:             * server, but the client has not yet acknowledged joining the
278:             * session. For example, if the server supported only cookie-based 
279:             * sessions and the client had completely disabled the use of
280:             * cookies, then calls to HttpServletRequest.getSession() would always 
281:             * return "new" sessions. 
282:             * @return true if the session has been created by the server but the 
283:             * client has not yet acknowledged joining the session; false otherwise 
284:             * @exception IllegalStateException if an attempt is made to access 
285:             * session data after the session has been invalidated 
286:             */
287:            public boolean isNew() {
288:                return isNew;
289:            }
290:
291:            protected void setNoMoreNew() {
292:                isNew = false;
293:            }
294:
295:            protected boolean isValid() {
296:                return isValid;
297:            }
298:
299:            protected Cookie getCookie() {
300:                return cookie;
301:            }
302:
303:            //jsdk2.1
304:
305:            public void setMaxInactiveInterval(int interval) {
306:                maxidle = interval;
307:            }
308:
309:            public int getMaxInactiveInterval() {
310:                return maxidle;
311:            }
312:
313:            // jsdk 2.3
314:            public ServletContext getServletContext() {
315:                return servletContext;
316:            }
317:
318:            public JigsawHttpSession(JigsawHttpSessionContext context,
319:                    JigsawServletContext servletContext, Cookie cookie) {
320:                this .values = new Hashtable();
321:                this .creationTime = System.currentTimeMillis();
322:                this .lastAccessedTime = creationTime;
323:                this .sc = context;
324:                this .id = context.addSession(this );
325:                this .cookie = cookie;
326:                this .servletContext = servletContext;
327:                cookie.setValue(this .id);
328:                isValid = true;
329:                isNew = true;
330:            }
331:
332:        }
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