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1
52
53 package freemarker.ext.jsp;
54
55 import java.util.ArrayList  ;
56 import java.util.EventListener ;
57 import java.util.Iterator ;
58 import java.util.List ;
59
60 import javax.servlet.ServletContext ;
61 import javax.servlet.ServletContextAttributeEvent ;
62 import javax.servlet.ServletContextAttributeListener ;
63 import javax.servlet.ServletContextEvent ;
64 import javax.servlet.ServletContextListener ;
65 import javax.servlet.http.HttpSessionAttributeListener ;
66 import javax.servlet.http.HttpSessionBindingEvent ;
67 import javax.servlet.http.HttpSessionEvent ;
68 import javax.servlet.http.HttpSessionListener ;
69
70 import freemarker.log.Logger;
71
72
79 public class EventForwarding
80 implements
81 ServletContextAttributeListener ,
82 ServletContextListener ,
83 HttpSessionListener ,
84 HttpSessionAttributeListener
85 {
86 private static final Logger logger = Logger.getLogger("freemarker.jsp");
87
88 private static final String ATTR_NAME = EventForwarding.class.getName();
89
90 private final List servletContextAttributeListeners = new ArrayList ();
91 private final List servletContextListeners = new ArrayList ();
92 private final List httpSessionAttributeListeners = new ArrayList ();
93 private final List httpSessionListeners = new ArrayList ();
94
95 void addListeners(List listeners)
96 {
97 for (Iterator iter = listeners.iterator(); iter.hasNext();)
98 {
99 addListener((EventListener )iter.next());
100 }
101 }
102
103 private void addListener(EventListener listener)
104 {
105 boolean added = false;
106 if(listener instanceof ServletContextAttributeListener )
107 {
108 addListener(servletContextAttributeListeners, listener);
109 added = true;
110 }
111 if(listener instanceof ServletContextListener )
112 {
113 addListener(servletContextListeners, listener);
114 added = true;
115 }
116 if(listener instanceof HttpSessionAttributeListener )
117 {
118 addListener(httpSessionAttributeListeners, listener);
119 added = true;
120 }
121 if(listener instanceof HttpSessionListener )
122 {
123 addListener(httpSessionListeners, listener);
124 added = true;
125 }
126 if(!added) {
127 logger.warn(
128 "Listener of class " + listener.getClass().getName() +
129 "wasn't registered as it doesn't implement any of the " +
130 "recognized listener interfaces.");
131 }
132 }
133
134 static EventForwarding getInstance(ServletContext context)
135 {
136 return (EventForwarding)context.getAttribute(ATTR_NAME);
137 }
138 private void addListener(List listeners, EventListener listener)
139 {
140 synchronized(listeners)
141 {
142 listeners.add(listener);
143 }
144 }
145
146 public void attributeAdded(ServletContextAttributeEvent arg0)
147 {
148 synchronized(servletContextAttributeListeners)
149 {
150 int s = servletContextAttributeListeners.size();
151 for(int i = 0; i < s; ++i)
152 {
153 ((ServletContextAttributeListener )servletContextAttributeListeners.get(i)).attributeAdded(arg0);
154 }
155 }
156 }
157
158 public void attributeRemoved(ServletContextAttributeEvent arg0)
159 {
160 synchronized(servletContextAttributeListeners)
161 {
162 int s = servletContextAttributeListeners.size();
163 for(int i = 0; i < s; ++i)
164 {
165 ((ServletContextAttributeListener )servletContextAttributeListeners.get(i)).attributeRemoved(arg0);
166 }
167 }
168 }
169
170 public void attributeReplaced(ServletContextAttributeEvent arg0)
171 {
172 synchronized(servletContextAttributeListeners)
173 {
174 int s = servletContextAttributeListeners.size();
175 for(int i = 0; i < s; ++i)
176 {
177 ((ServletContextAttributeListener )servletContextAttributeListeners.get(i)).attributeReplaced(arg0);
178 }
179 }
180 }
181
182 public void contextInitialized(ServletContextEvent arg0)
183 {
184 arg0.getServletContext().setAttribute(ATTR_NAME, this);
185
186 synchronized(servletContextListeners)
187 {
188 int s = servletContextListeners.size();
189 for(int i = 0; i < s; ++i)
190 {
191 ((ServletContextListener )servletContextListeners.get(i)).contextInitialized(arg0);
192 }
193 }
194 }
195
196 public void contextDestroyed(ServletContextEvent arg0)
197 {
198 synchronized(servletContextListeners)
199 {
200 int s = servletContextListeners.size();
201 for(int i = s - 1; i >= 0; --i)
202 {
203 ((ServletContextListener )servletContextListeners.get(i)).contextDestroyed(arg0);
204 }
205 }
206 }
207
208 public void sessionCreated(HttpSessionEvent arg0)
209 {
210 synchronized(httpSessionListeners)
211 {
212 int s = httpSessionListeners.size();
213 for(int i = 0; i < s; ++i)
214 {
215 ((HttpSessionListener )httpSessionListeners.get(i)).sessionCreated(arg0);
216 }
217 }
218 }
219
220 public void sessionDestroyed(HttpSessionEvent arg0)
221 {
222 synchronized(httpSessionListeners)
223 {
224 int s = httpSessionListeners.size();
225 for(int i = s - 1; i >= 0; --i)
226 {
227 ((HttpSessionListener )httpSessionListeners.get(i)).sessionDestroyed(arg0);
228 }
229 }
230 }
231
232 public void attributeAdded(HttpSessionBindingEvent arg0)
233 {
234 synchronized(httpSessionAttributeListeners)
235 {
236 int s = httpSessionAttributeListeners.size();
237 for(int i = 0; i < s; ++i)
238 {
239 ((HttpSessionAttributeListener )httpSessionAttributeListeners.get(i)).attributeAdded(arg0);
240 }
241 }
242 }
243
244 public void attributeRemoved(HttpSessionBindingEvent arg0)
245 {
246 synchronized(httpSessionAttributeListeners)
247 {
248 int s = httpSessionAttributeListeners.size();
249 for(int i = 0; i < s; ++i)
250 {
251 ((HttpSessionAttributeListener )httpSessionAttributeListeners.get(i)).attributeRemoved(arg0);
252 }
253 }
254 }
255
256 public void attributeReplaced(HttpSessionBindingEvent arg0)
257 {
258 synchronized(httpSessionAttributeListeners)
259 {
260 int s = httpSessionAttributeListeners.size();
261 for(int i = 0; i < s; ++i)
262 {
263 ((HttpSessionAttributeListener )httpSessionAttributeListeners.get(i)).attributeReplaced(arg0);
264 }
265 }
266 }
267 }
268 |
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