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14 package org.wings.session;
15
16 import org.apache.commons.logging.Log;
17 import org.apache.commons.logging.LogFactory;
18 import org.wings.LowLevelEventListener;
19 import org.wings.SButton;
20 import org.wings.SCheckBox;
21 import org.wings.SClickable;
22 import org.wings.SComponent;
23 import org.wings.SConstants;
24 import org.wings.SFrame;
25 import org.wings.SPageScroller;
26 import org.wings.SRadioButton;
27 import org.wings.SScrollBar;
28 import org.wings.STabbedPane;
29 import org.wings.STable;
30 import org.wings.SToggleButton;
31 import org.wings.STree;
32
33 import java.util.ArrayList  ;
34 import java.util.Arrays ;
35 import java.util.HashMap ;
36 import java.util.LinkedList ;
37 import java.util.List ;
38
39
43 public final class LowLevelEventDispatcher
44 implements java.io.Serializable {
45 private final transient static Log log = LogFactory.getLog(LowLevelEventDispatcher.class);
46
47 private final HashMap listeners = new HashMap ();
48
49 protected boolean namedEvents = true;
50
51
56 private static final List ieButtonFixClasses = Arrays.asList(new Class [] {
57 SButton.class, SToggleButton.class, SClickable.class,
58 SPageScroller.class, SRadioButton.class, SScrollBar.class,
59 STabbedPane.class, STable.class, STree.class});
60
61 public LowLevelEventDispatcher() {}
62
63 public final void addLowLevelEventListener(LowLevelEventListener gl,
64 String eventId) {
65 List l = (List ) listeners.get(eventId);
66 if (l == null) {
67 l = new ArrayList (2);
68 l.add(gl);
69 listeners.put(eventId, l);
70 } else if (!l.contains(gl))
71 l.add(gl);
72 }
73
74 public final void removeLowLevelEventListener(LowLevelEventListener gl,
75 String eventId) {
76 List l = (List ) listeners.get(eventId);
77 if (l != null) {
78 l.remove(gl);
79 if (l.size() == 0)
80 listeners.remove(eventId);
81 }
82 }
83
84 public final LowLevelEventListener getLowLevelEventListener(String eventId) {
85 return (LowLevelEventListener) listeners.get(eventId);
86 }
87
88 public final void setNamedEvents(boolean b) {
89 namedEvents = b;
90 }
91
92
98 public void register(LowLevelEventListener gl) {
99 if (gl == null)
100 return;
101
102 String key = gl.getLowLevelEventId();
103
104 log.debug("dispatcher: register '" + key + "' type: " + gl.getClass());
105 addLowLevelEventListener(gl, key);
106
107 if (namedEvents) {
108 key = gl.getName();
109 if (key != null && key.trim().length() > 0) {
110 log.debug("dispatcher: register named '" + key + "'");
111 addLowLevelEventListener(gl, key);
112 }
113 }
114 }
115
116
120 public void unregister(LowLevelEventListener gl) {
121 if (gl == null)
122 return;
123
124 String key = gl.getLowLevelEventId();
125
126 log.debug("unregister '" + key + "'");
127 removeLowLevelEventListener(gl, key);
128
129 key = gl.getName();
130 if (key != null && key.trim().length() > 0) {
131 log.debug("unregister named '" + key + "'");
132 removeLowLevelEventListener(gl, key);
133 }
134
135 }
136
137
144 public boolean dispatch(String name, String [] values) {
145 if (log.isDebugEnabled())
146 log.debug("dispatch " + name + " = " + Arrays.asList(values));
147
148 boolean result = false;
149 int dividerIndex = name.indexOf(SConstants.UID_DIVIDER);
150 String epoch = null;
151 boolean isIE = SessionManager.getSession().getUserAgent().getBrowserType() == BrowserType.IE;
152
153 if (dividerIndex > 0) {
155 epoch = name.substring(0, dividerIndex);
156 name = name.substring(dividerIndex + 1);
157 }
158
159 if (name.endsWith(".x") || name.endsWith(".X")) {
162 name = name.substring(0, name.length() - 2);
163 } else if (name.endsWith(".y") || name.endsWith(".Y")) {
164 log.debug("discard '.y' part of image event");
166 return false;
167 }
168
169 int p = name.indexOf(SConstants.UID_DIVIDER);
171 if (p > -1) {
172 String v = name.substring(p + 1);
173 name = name.substring(0, p);
174 String [] va = new String [values.length + 1];
175 System.arraycopy(values, 0, va, 0, values.length);
176 va[values.length] = v;
177 values = va;
178 }
179
180
200 if (isIE && name.equals(SConstants.IEFIX_BUTTONACTION)) {
201 String buttonId = values[0];
202 String [] vals = new String [] {""};
203 int pos = buttonId.indexOf(SConstants.UID_DIVIDER);
204 if (pos > -1) {
205 String val = buttonId.substring(pos + 1);
206 buttonId = buttonId.substring(0, pos);
207 vals[0] = val;
208 }
209 List l = (List ) listeners.get(buttonId);
210 if (l != null && l.size() > 0) {
211 if (log.isDebugEnabled()) {
212 log.debug("process special IE workaround event '" + epoch + SConstants.UID_DIVIDER + name + "'");
213 }
214 for (int i = 0; i < l.size(); ++i) {
215 LowLevelEventListener gl = (LowLevelEventListener) l.get(i);
216 if (gl.isEnabled()) {
217 if (checkEpoch(epoch, buttonId, gl)) {
218 if (log.isDebugEnabled()) {
219 log.debug("process event '" + buttonId + "' by " +
220 gl.getClass() + "(" + gl.getLowLevelEventId() +
221 ")");
222 }
223 gl.processLowLevelEvent(buttonId,vals);
224 result = true;
225 }
226 }
227 }
228 }
229 }
230 List l = (List ) listeners.get(name);
231 if (l != null && l.size() > 0) {
232 log.debug("process event '" + epoch + SConstants.UID_DIVIDER + name + "'");
233 for (int i = 0; i < l.size(); ++i) {
234 LowLevelEventListener gl = (LowLevelEventListener) l.get(i);
235 if (gl.isEnabled()) {
236 if (checkEpoch(epoch, name, gl)) {
237 if (isIE) {
238 boolean isFormEvent = ((SComponent)gl).getResidesInForm() && ((SComponent)gl).getShowAsFormComponent();
240 if (isFormEvent) {
241 boolean isButton = ieButtonFixClasses.contains(gl.getClass());
243 if (isButton) {
244 log.debug("circumventing IE bug, not processing event '" + name + "' by " +
245 gl.getClass() + "(" + gl.getLowLevelEventId() +
246 ")");
247 } else {
248 log.debug("process form event not caused by a button tag'" + name + "' by " +
249 gl.getClass() + "(" + gl.getLowLevelEventId() +
250 ")");
251 gl.processLowLevelEvent(name, values);
252 result = true;
253 }
254 } else {
255 log.debug("process event '" + name + "' by " +
256 gl.getClass() + "(" + gl.getLowLevelEventId() +
257 ")");
258 gl.processLowLevelEvent(name, values);
259 result = true;
260 }
261 } else {
262 log.debug("process event '" + name + "' by " +
263 gl.getClass() + "(" + gl.getLowLevelEventId() +
264 ")");
265 gl.processLowLevelEvent(name, values);
266 result = true;
267 }
268 }
269 }
270 }
271 }
272 return result;
273 }
274
275 protected boolean checkEpoch(String epoch, String name,
276 LowLevelEventListener gl) {
277 if (epoch != null) {
278 SFrame frame = ((SComponent) gl).getParentFrame();
279 if (frame == null) {
280 if (log.isDebugEnabled())
281 log.debug("request for dangling component '" + epoch + SConstants.UID_DIVIDER + name);
282 unregister(gl);
283 return false;
284 }
285 if (!epoch.equals(frame.getEventEpoch())) {
286 if (log.isDebugEnabled()) {
287 log.debug("### got outdated event '" + epoch + SConstants.UID_DIVIDER + name
288 + "' from frame '" + frame.getName() + "'; expected epoch: " + frame.getEventEpoch());
289 }
290 frame.fireInvalidLowLevelEventListener(gl);
291 return false;
292 }
293 }
294 return true;
295 }
296
297 void clear() {
298 listeners.clear();
299 }
300 }
301
302
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