icuSources/common/icunotif.cpp

   1 /**
   2  *******************************************************************************
   3  * Copyright (C) 2001-2002, International Business Machines Corporation and    *
   4  * others. All Rights Reserved.                                                *
   5  *******************************************************************************
   6  */
   7
   8 #include "unicode/utypes.h"
   9
  10 #if !UCONFIG_NO_SERVICE
  11
  12 #include "icunotif.h"
  13 #include <stdio.h>
  14
  15 U_NAMESPACE_BEGIN
  16
  17 const char EventListener::fgClassID = '\0';
  18
  19 void
  20 ICUNotifier::addListener(const EventListener* l, UErrorCode& status)
  21 {
  22   if (U_SUCCESS(status)) {
  23     if (l == NULL) {
  24       status = U_ILLEGAL_ARGUMENT_ERROR;
  25     }
  26
  27     if (acceptsListener(*l)) {
  28       Mutex lmx(&notifyLock);
  29       if (listeners == NULL) {
  30         listeners = new UVector(5, status);
  31       } else {
  32         for (int i = 0, e = listeners->size(); i < e; ++i) {
  33           const EventListener* el = (const EventListener*)(listeners->elementAt(i));
  34           if (l == el) {
  35             return;
  36           }
  37         }
  38       }
  39
  40       listeners->addElement((void*)l, status); // cast away const
  41     } else {
  42 #if DEBUG
  43       fprintf(stderr, "Listener invalid for this notifier.");
  44       exit(1);
  45 #endif
  46     }
  47   }
  48 }
  49
  50 void
  51 ICUNotifier::removeListener(const EventListener *l, UErrorCode& status)
  52 {
  53   if (U_SUCCESS(status)) {
  54     if (l == NULL) {
  55       status = U_ILLEGAL_ARGUMENT_ERROR;
  56       return;
  57     }
  58
  59     {
  60       Mutex lmx(&notifyLock);
  61       if (listeners != NULL) {
  62         // identity equality check
  63         for (int i = 0, e = listeners->size(); i < e; ++i) {
  64           const EventListener* el = (const EventListener*)listeners->elementAt(i);
  65           if (l == el) {
  66             listeners->removeElementAt(i);
  67             if (listeners->size() == 0) {
  68               delete listeners;
  69               listeners = NULL;
  70             }
  71             return;
  72           }
  73         }
  74       }
  75     }
  76   }
  77 }
  78
  79 void
  80 ICUNotifier::notifyChanged(void)
  81 {
  82   if (listeners != NULL) {
  83     Mutex lmx(&notifyLock);
  84     if (listeners != NULL) {
  85       for (int i = 0, e = listeners->size(); i < e; ++i) {
  86         EventListener* el = (EventListener*)listeners->elementAt(i);
  87         notifyListener(*el);
  88       }
  89     }
  90   }
  91 }
  92
  93 U_NAMESPACE_END;
  94
  95 /* UCONFIG_NO_SERVICE */
  96 #endif
  97