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Java > Open Source Codes > com > jcorporate > expresso > core > misc > DefaultSysEventHubImpl


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64
65 package com.jcorporate.expresso.core.misc;
66
67 import java.util.Enumeration JavaDoc;
68 import java.util.Hashtable JavaDoc;
69 import java.util.Vector JavaDoc;
70
71
72 public class DefaultSysEventHubImpl
73         implements SysEventHubImpl {
74     private Hashtable JavaDoc listeners = new Hashtable JavaDoc();
75
76     public void addListener(SysEventListener listener,
77                             String JavaDoc newTriggeringClass, String JavaDoc newCode) {
78         Vector JavaDoc oneListenerList = (Vector JavaDoc) listeners.get(newTriggeringClass +
79                 "|" + newCode);
80
81         if (oneListenerList == null) {
82             oneListenerList = new Vector JavaDoc();
83             listeners.put(newTriggeringClass + "|" + newCode, oneListenerList);
84         }
85
86         oneListenerList.addElement(listener);
87     } /* addListener */
88
89
90     public void removeListener(SysEventListener listener,
91                                String JavaDoc newTriggeringClass, String JavaDoc newCode) {
92         Vector JavaDoc oneListenerList = (Vector JavaDoc) listeners.get(newTriggeringClass +
93                 "|" + newCode);
94
95         if (oneListenerList == null) {
96             return;
97         }
98         for (Enumeration JavaDoc ee = oneListenerList.elements();
99              ee.hasMoreElements();) {
100             SysEventListener oneListener = (SysEventListener) ee.nextElement();
101
102             if (oneListener == listener) {
103                 oneListenerList.remove(listener);
104             }
105         }
106     } /* removeListener */
107
108
109     public void trigger(SysEvent theEvent) {
110         Vector JavaDoc oneListenerList = (Vector JavaDoc) listeners.get(theEvent.getTriggeringObjectClass() +
111                 "|" +
112                 theEvent.getEventCode());
113
114         if (oneListenerList == null) {
115
116             /* Nobody is listening... */
117             return;
118         }
119         for (Enumeration JavaDoc ee = oneListenerList.elements();
120              ee.hasMoreElements();) {
121             SysEventListener oneListener = (SysEventListener) ee.nextElement();
122             oneListener.receiveEvent(theEvent);
123         }
124     }
125 }
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