/**
 *******************************************************************************
 * Copyright (C) 2001-2002, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */

#include "unicode/utypes.h"

#if !UCONFIG_NO_SERVICE

#include "icunotif.h"
#include <stdio.h>

U_NAMESPACE_BEGIN

const char EventListener::fgClassID = '\0';

void 
ICUNotifier::addListener(const EventListener* l, UErrorCode& status) 
{
  if (U_SUCCESS(status)) {
    if (l == NULL) {
      status = U_ILLEGAL_ARGUMENT_ERROR;
    }

    if (acceptsListener(*l)) {
      Mutex lmx(&notifyLock);
      if (listeners == NULL) {
        listeners = new UVector(5, status);
      } else {
        for (int i = 0, e = listeners->size(); i < e; ++i) {
          const EventListener* el = (const EventListener*)(listeners->elementAt(i));
          if (l == el) {
            return;
          }
        }
      }

      listeners->addElement((void*)l, status); // cast away const
    } else {
#if DEBUG
      fprintf(stderr, "Listener invalid for this notifier.");
      exit(1);
#endif
    }
  }
}

void 
ICUNotifier::removeListener(const EventListener *l, UErrorCode& status) 
{
  if (U_SUCCESS(status)) {
    if (l == NULL) {
      status = U_ILLEGAL_ARGUMENT_ERROR;
      return;
    }

    {
      Mutex lmx(&notifyLock);
      if (listeners != NULL) {
        // identity equality check
        for (int i = 0, e = listeners->size(); i < e; ++i) {
          const EventListener* el = (const EventListener*)listeners->elementAt(i);
          if (l == el) {
            listeners->removeElementAt(i);
            if (listeners->size() == 0) {
              delete listeners;
              listeners = NULL;
            }
            return;
          }
        }
      }
    }
  }
}

void 
ICUNotifier::notifyChanged(void) 
{
  if (listeners != NULL) {
    Mutex lmx(&notifyLock);
    if (listeners != NULL) {
      for (int i = 0, e = listeners->size(); i < e; ++i) {
        EventListener* el = (EventListener*)listeners->elementAt(i);
        notifyListener(*el);
      }
    }
  }
}

U_NAMESPACE_END;

/* UCONFIG_NO_SERVICE */
#endif