embedding/components/appstartup/src/nsAppStartupNotifier.cpp

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   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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  22  * Contributor(s):
  23  *   Ben Turner <mozilla@songbirdnest.com
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  38
  39 #include "nsCOMPtr.h"
  40 #include "nsString.h"
  41 #include "nsXPIDLString.h"
  42 #include "nsIServiceManager.h"
  43 #include "nsICategoryManager.h"
  44 #include "nsXPCOM.h"
  45 #include "nsISupportsPrimitives.h"
  46 #include "nsAppStartupNotifier.h"
  47
  48 NS_IMPL_ISUPPORTS1(nsAppStartupNotifier, nsIObserver)
  49
  50 nsAppStartupNotifier::nsAppStartupNotifier()
  51 {
  52 }
  53
  54 nsAppStartupNotifier::~nsAppStartupNotifier()
  55 {
  56 }
  57
  58 NS_IMETHODIMP nsAppStartupNotifier::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *someData)
  59 {
  60     NS_ENSURE_ARG(aTopic);
  61     nsresult rv;
  62
  63     // now initialize all startup listeners
  64     nsCOMPtr<nsICategoryManager> categoryManager =
  65                     do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
  66     NS_ENSURE_SUCCESS(rv, rv);
  67
  68     nsCOMPtr<nsISimpleEnumerator> enumerator;
  69     rv = categoryManager->EnumerateCategory(aTopic,
  70                                getter_AddRefs(enumerator));
  71     if (NS_FAILED(rv)) return rv;
  72
  73     nsCOMPtr<nsISupports> entry;
  74     while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
  75         nsCOMPtr<nsISupportsCString> category = do_QueryInterface(entry, &rv);
  76
  77         if (NS_SUCCEEDED(rv)) {
  78             nsCAutoString categoryEntry;
  79             rv = category->GetData(categoryEntry);
  80
  81             nsXPIDLCString contractId;
  82             categoryManager->GetCategoryEntry(aTopic,
  83                                               categoryEntry.get(),
  84                                               getter_Copies(contractId));
  85
  86             if (NS_SUCCEEDED(rv)) {
  87
  88                 // If we see the word "service," in the beginning
  89                 // of the contractId then we create it as a service
  90                 // if not we do a createInstance
  91
  92                 nsCOMPtr<nsISupports> startupInstance;
  93                 if (Substring(contractId, 0, 8).EqualsLiteral("service,"))
  94                     startupInstance = do_GetService(contractId.get() + 8, &rv);
  95                 else
  96                     startupInstance = do_CreateInstance(contractId, &rv);
  97
  98                 if (NS_SUCCEEDED(rv)) {
  99                     // Try to QI to nsIObserver
 100                     nsCOMPtr<nsIObserver> startupObserver =
 101                         do_QueryInterface(startupInstance, &rv);
 102                     if (NS_SUCCEEDED(rv)) {
 103                         rv = startupObserver->Observe(nsnull, aTopic, nsnull);
 104
 105                         // mainly for debugging if you want to know if your observer worked.
 106                         NS_ASSERTION(NS_SUCCEEDED(rv), "Startup Observer failed!\n");
 107                     }
 108                 }
 109                 else {
 110                   #ifdef NS_DEBUG
 111                     nsCAutoString warnStr("Cannot create startup observer : ");
 112                     warnStr += contractId.get();
 113                     NS_WARNING(warnStr.get());
 114                   #endif
 115                 }
 116             }
 117         }
 118     }
 119
 120     return NS_OK;
 121 }