1 files changed, 799 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.cpp b/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.cpp
new file mode 100644
index 00000000..d7202bdb
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.cpp
@@ -0,0 +1,799 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Scott Collins <scc@netscape.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#define PL_ARENA_CONST_ALIGN_MASK 7
+
+#include "nsICategoryManager.h"
+#include "nsCategoryManager.h"
+
+#include "plarena.h"
+#include "prio.h"
+#include "prprf.h"
+#include "prlock.h"
+#include "nsCOMPtr.h"
+#include "nsTHashtable.h"
+#include "nsClassHashtable.h"
+#include "nsIFactory.h"
+#include "nsIStringEnumerator.h"
+#include "nsSupportsPrimitives.h"
+#include "nsIServiceManagerUtils.h"
+#include "nsIObserver.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsEnumeratorUtils.h"
+
+class nsIComponentLoaderManager;
+
+/*
+  CategoryDatabase
+  contains 0 or more 1-1 mappings of string to Category
+  each Category contains 0 or more 1-1 mappings of string keys to string values
+
+  In other words, the CategoryDatabase is a tree, whose root is a hashtable.
+  Internal nodes (or Categories) are hashtables. Leaf nodes are strings.
+
+  The leaf strings are allocated in an arena, because we assume they're not
+  going to change much ;)
+*/
+
+#define NS_CATEGORYMANAGER_ARENA_SIZE (1024 * 8)
+
+// pulled in from nsComponentManager.cpp
+char* ArenaStrdup(const char* s, PLArenaPool* aArena);
+
+//
+// BaseStringEnumerator is subclassed by EntryEnumerator and
+// CategoryEnumerator
+//
+class BaseStringEnumerator
+  : public nsISimpleEnumerator,
+           nsIUTF8StringEnumerator
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISIMPLEENUMERATOR
+  NS_DECL_NSIUTF8STRINGENUMERATOR
+
+protected:
+  BaseStringEnumerator()
+    : mArray(nsnull),
+      mCount(0),
+      mSimpleCurItem(0),
+      mStringCurItem(0) { }
+
+  // A virtual destructor is needed here because subclasses of
+  // BaseStringEnumerator do not implement their own Release() method.
+
+  virtual ~BaseStringEnumerator()
+  {
+    if (mArray)
+      delete[] mArray;
+  }
+
+  const char** mArray;
+  PRUint32 mCount;
+  PRUint32 mSimpleCurItem;
+  PRUint32 mStringCurItem;
+};
+
+NS_IMPL_ISUPPORTS2(BaseStringEnumerator, nsISimpleEnumerator, nsIUTF8StringEnumerator)
+
+NS_IMETHODIMP
+BaseStringEnumerator::HasMoreElements(PRBool *_retval)
+{
+  *_retval = (mSimpleCurItem < mCount);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::GetNext(nsISupports **_retval)
+{
+  if (mSimpleCurItem >= mCount)
+    return NS_ERROR_FAILURE;
+
+  nsSupportsDependentCString* str =
+    new nsSupportsDependentCString(mArray[mSimpleCurItem++]);
+  if (!str)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  *_retval = str;
+  NS_ADDREF(*_retval);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::HasMore(PRBool *_retval)
+{
+  *_retval = (mStringCurItem < mCount);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::GetNext(nsACString& _retval)
+{
+  if (mStringCurItem >= mCount)
+    return NS_ERROR_FAILURE;
+
+  _retval = nsDependentCString(mArray[mStringCurItem++]);
+  return NS_OK;
+}
+
+
+//
+// EntryEnumerator is the wrapper that allows nsICategoryManager::EnumerateCategory
+//
+class EntryEnumerator
+  : public BaseStringEnumerator
+{
+public:
+  static EntryEnumerator* Create(nsTHashtable<CategoryLeaf>& aTable);
+
+private:
+  static PLDHashOperator PR_CALLBACK
+    enumfunc_createenumerator(CategoryLeaf* aLeaf, void* userArg);
+};
+
+
+PLDHashOperator PR_CALLBACK
+EntryEnumerator::enumfunc_createenumerator(CategoryLeaf* aLeaf, void* userArg)
+{
+  EntryEnumerator* mythis = NS_STATIC_CAST(EntryEnumerator*, userArg);
+  mythis->mArray[mythis->mCount++] = aLeaf->GetKey();
+
+  return PL_DHASH_NEXT;
+}
+
+EntryEnumerator*
+EntryEnumerator::Create(nsTHashtable<CategoryLeaf>& aTable)
+{
+  EntryEnumerator* enumObj = new EntryEnumerator();
+  if (!enumObj)
+    return nsnull;
+
+  enumObj->mArray = new char const* [aTable.Count()];
+  if (!enumObj->mArray) {
+    delete enumObj;
+    return nsnull;
+  }
+
+  aTable.EnumerateEntries(enumfunc_createenumerator, enumObj);
+
+  return enumObj;
+}
+
+
+//
+// CategoryNode implementations
+//
+
+CategoryNode*
+CategoryNode::Create(PLArenaPool* aArena)
+{
+  CategoryNode* node = new(aArena) CategoryNode();
+  if (!node)
+    return nsnull;
+
+  if (!node->mTable.Init()) {
+    delete node;
+    return nsnull;
+  }
+
+  node->mLock = PR_NewLock();
+  if (!node->mLock) {
+    delete node;
+    return nsnull;
+  }
+
+  return node;
+}
+
+CategoryNode::~CategoryNode()
+{
+  if (mLock)
+    PR_DestroyLock(mLock);
+}
+
+void*
+CategoryNode::operator new(size_t aSize, PLArenaPool* aArena)
+{
+  void* p;
+  PL_ARENA_ALLOCATE(p, aArena, aSize);
+  return p;
+}
+
+NS_METHOD
+CategoryNode::GetLeaf(const char* aEntryName,
+                      char** _retval)
+{
+  PR_Lock(mLock);
+  nsresult rv = NS_ERROR_NOT_AVAILABLE;
+  CategoryLeaf* ent =
+    mTable.GetEntry(aEntryName);
+
+  // we only want the non-persistent value
+  if (ent && ent->nonpValue) {
+    *_retval = nsCRT::strdup(ent->nonpValue);
+    if (*_retval)
+      rv = NS_OK;
+  }
+  PR_Unlock(mLock);
+
+  return rv;
+}
+
+NS_METHOD
+CategoryNode::AddLeaf(const char* aEntryName,
+                      const char* aValue,
+                      PRBool aPersist,
+                      PRBool aReplace,
+                      char** _retval,
+                      PLArenaPool* aArena)
+{
+  PR_Lock(mLock);
+  CategoryLeaf* leaf = 
+    mTable.GetEntry(aEntryName);
+
+  nsresult rv = NS_OK;
+  if (leaf) {
+    //if the entry was found, aReplace must be specified
+    if (!aReplace && (leaf->nonpValue || (aPersist && leaf->pValue )))
+      rv = NS_ERROR_INVALID_ARG;
+  } else {
+    const char* arenaEntryName = ArenaStrdup(aEntryName, aArena);
+    if (!arenaEntryName) {
+      rv = NS_ERROR_OUT_OF_MEMORY;
+    } else {
+      leaf = mTable.PutEntry(arenaEntryName);
+      if (!leaf)
+        rv = NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  if (NS_SUCCEEDED(rv)) {
+    const char* arenaValue = ArenaStrdup(aValue, aArena);
+    if (!arenaValue) {
+      rv = NS_ERROR_OUT_OF_MEMORY;
+    } else {
+      leaf->nonpValue = arenaValue;
+      if (aPersist)
+        leaf->pValue = arenaValue;
+    }
+  }
+    
+  PR_Unlock(mLock);
+  return rv;
+}
+
+NS_METHOD
+CategoryNode::DeleteLeaf(const char* aEntryName,
+                         PRBool aDontPersist)
+{
+  // we don't throw any errors, because it normally doesn't matter
+  // and it makes JS a lot cleaner
+  PR_Lock(mLock);
+
+  if (aDontPersist) {
+    // we can just remove the entire hash entry without introspection
+    mTable.RemoveEntry(aEntryName);
+  } else {
+    // if we are keeping the persistent value, we need to look at
+    // the contents of the current entry
+    CategoryLeaf* leaf = mTable.GetEntry(aEntryName);
+    if (leaf) {
+      if (leaf->pValue) {
+        leaf->nonpValue = nsnull;
+      } else {
+        // if there is no persistent value, just remove the entry
+        mTable.RawRemoveEntry(leaf);
+      }
+    }
+  }
+  PR_Unlock(mLock);
+
+  return NS_OK;
+}
+
+NS_METHOD 
+CategoryNode::Enumerate(nsISimpleEnumerator **_retval)
+{
+  NS_ENSURE_ARG_POINTER(_retval);
+
+  PR_Lock(mLock);
+  EntryEnumerator* enumObj = EntryEnumerator::Create(mTable);
+  PR_Unlock(mLock);
+
+  if (!enumObj)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  *_retval = enumObj;
+  NS_ADDREF(*_retval);
+  return NS_OK;
+}
+
+struct persistent_userstruct {
+  PRFileDesc* fd;
+  const char* categoryName;
+  PRBool      success;
+};
+
+PLDHashOperator PR_CALLBACK
+enumfunc_pentries(CategoryLeaf* aLeaf, void* userArg)
+{
+  persistent_userstruct* args =
+    NS_STATIC_CAST(persistent_userstruct*, userArg);
+
+  PLDHashOperator status = PL_DHASH_NEXT;
+
+  if (aLeaf->pValue) {
+    if (PR_fprintf(args->fd,
+                   "%s,%s,%s\n",
+                   args->categoryName,
+                   aLeaf->GetKey(),
+                   aLeaf->pValue) == (PRUint32) -1) {
+      args->success = PR_FALSE;
+      status = PL_DHASH_STOP;
+    }
+  }
+
+  return status;
+}
+
+PRBool
+CategoryNode::WritePersistentEntries(PRFileDesc* fd, const char* aCategoryName)
+{
+  persistent_userstruct args = {
+    fd,
+    aCategoryName,
+    PR_TRUE
+  };
+
+  PR_Lock(mLock);
+  mTable.EnumerateEntries(enumfunc_pentries, &args);
+  PR_Unlock(mLock);
+
+  return args.success;
+}
+
+
+//
+// CategoryEnumerator class
+//
+
+class CategoryEnumerator
+  : public BaseStringEnumerator
+{
+public:
+  static CategoryEnumerator* Create(nsClassHashtable<nsDepCharHashKey, CategoryNode>& aTable);
+
+private:
+  static PLDHashOperator PR_CALLBACK
+  enumfunc_createenumerator(const char* aStr,
+                            CategoryNode* aNode,
+                            void* userArg);
+};
+
+CategoryEnumerator*
+CategoryEnumerator::Create(nsClassHashtable<nsDepCharHashKey, CategoryNode>& aTable)
+{
+  CategoryEnumerator* enumObj = new CategoryEnumerator();
+  if (!enumObj)
+    return nsnull;
+
+  enumObj->mArray = new const char* [aTable.Count()];
+  if (!enumObj->mArray) {
+    delete enumObj;
+    return nsnull;
+  }
+
+  aTable.EnumerateRead(enumfunc_createenumerator, enumObj);
+
+  return enumObj;
+}
+
+PLDHashOperator PR_CALLBACK
+CategoryEnumerator::enumfunc_createenumerator(const char* aStr, CategoryNode* aNode, void* userArg)
+{
+  CategoryEnumerator* mythis = NS_STATIC_CAST(CategoryEnumerator*, userArg);
+
+  // if a category has no entries, we pretend it doesn't exist
+  if (aNode->Count())
+    mythis->mArray[mythis->mCount++] = aStr;
+
+  return PL_DHASH_NEXT;
+}
+
+
+//
+// nsCategoryManager implementations
+//
+
+NS_IMPL_THREADSAFE_ISUPPORTS1(nsCategoryManager, nsICategoryManager)
+
+nsCategoryManager*
+nsCategoryManager::Create()
+{
+  nsCategoryManager* manager = new nsCategoryManager();
+  
+  if (!manager)
+    return nsnull;
+
+  PL_INIT_ARENA_POOL(&(manager->mArena), "CategoryManagerArena",
+                     NS_CATEGORYMANAGER_ARENA_SIZE); // this never fails
+
+  if (!manager->mTable.Init()) {
+    delete manager;
+    return nsnull;
+  }
+
+  manager->mLock = PR_NewLock();
+
+  if (!manager->mLock) {
+    delete manager;
+    return nsnull;
+  }
+
+  return manager;
+}
+
+nsCategoryManager::~nsCategoryManager()
+{
+  if (mLock)
+    PR_DestroyLock(mLock);
+
+  // the hashtable contains entries that must be deleted before the arena is
+  // destroyed, or else you will have PRLocks undestroyed and other Really
+  // Bad Stuff (TM)
+  mTable.Clear();
+
+  PL_FinishArenaPool(&mArena);
+}
+
+inline CategoryNode*
+nsCategoryManager::get_category(const char* aName) {
+  CategoryNode* node;
+  if (!mTable.Get(aName, &node)) {
+    return nsnull;
+  }
+  return node;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::GetCategoryEntry( const char *aCategoryName,
+                                     const char *aEntryName,
+                                     char **_retval )
+{
+  NS_ENSURE_ARG_POINTER(aCategoryName);
+  NS_ENSURE_ARG_POINTER(aEntryName);
+  NS_ENSURE_ARG_POINTER(_retval);
+
+  nsresult status = NS_ERROR_NOT_AVAILABLE;
+
+  PR_Lock(mLock);
+  CategoryNode* category = get_category(aCategoryName);
+  PR_Unlock(mLock);
+
+  if (category) {
+    status = category->GetLeaf(aEntryName, _retval);
+  }
+
+  return status;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::AddCategoryEntry( const char *aCategoryName,
+                                     const char *aEntryName,
+                                     const char *aValue,
+                                     PRBool aPersist,
+                                     PRBool aReplace,
+                                     char **_retval )
+{
+  NS_ENSURE_ARG_POINTER(aCategoryName);
+  NS_ENSURE_ARG_POINTER(aEntryName);
+  NS_ENSURE_ARG_POINTER(aValue);
+
+  // Before we can insert a new entry, we'll need to
+  //  find the |CategoryNode| to put it in...
+  PR_Lock(mLock);
+  CategoryNode* category = get_category(aCategoryName);
+
+  if (!category) {
+    // That category doesn't exist yet; let's make it.
+    category = CategoryNode::Create(&mArena);
+        
+    char* categoryName = ArenaStrdup(aCategoryName, &mArena);
+    mTable.Put(categoryName, category);
+  }
+  PR_Unlock(mLock);
+
+  if (!category)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  return category->AddLeaf(aEntryName,
+                           aValue,
+                           aPersist,
+                           aReplace,
+                           _retval,
+                           &mArena);
+}
+
+NS_IMETHODIMP
+nsCategoryManager::DeleteCategoryEntry( const char *aCategoryName,
+                                        const char *aEntryName,
+                                        PRBool aDontPersist)
+{
+  NS_ENSURE_ARG_POINTER(aCategoryName);
+  NS_ENSURE_ARG_POINTER(aEntryName);
+
+  /*
+    Note: no errors are reported since failure to delete
+    probably won't hurt you, and returning errors seriously
+    inconveniences JS clients
+  */
+
+  PR_Lock(mLock);
+  CategoryNode* category = get_category(aCategoryName);
+  PR_Unlock(mLock);
+
+  if (!category)
+    return NS_OK;
+
+  return category->DeleteLeaf(aEntryName,
+                              aDontPersist);
+}
+
+NS_IMETHODIMP
+nsCategoryManager::DeleteCategory( const char *aCategoryName )
+{
+  NS_ENSURE_ARG_POINTER(aCategoryName);
+
+  // the categories are arena-allocated, so we don't
+  // actually delete them. We just remove all of the
+  // leaf nodes.
+
+  PR_Lock(mLock);
+  CategoryNode* category = get_category(aCategoryName);
+  PR_Unlock(mLock);
+
+  if (category)
+    category->Clear();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::EnumerateCategory( const char *aCategoryName,
+                                      nsISimpleEnumerator **_retval )
+{
+  NS_ENSURE_ARG_POINTER(aCategoryName);
+  NS_ENSURE_ARG_POINTER(_retval);
+
+  PR_Lock(mLock);
+  CategoryNode* category = get_category(aCategoryName);
+  PR_Unlock(mLock);
+  
+  if (!category) {
+    return NS_NewEmptyEnumerator(_retval);
+  }
+
+  return category->Enumerate(_retval);
+}
+
+NS_IMETHODIMP 
+nsCategoryManager::EnumerateCategories(nsISimpleEnumerator **_retval)
+{
+  NS_ENSURE_ARG_POINTER(_retval);
+
+  PR_Lock(mLock);
+  CategoryEnumerator* enumObj = CategoryEnumerator::Create(mTable);
+  PR_Unlock(mLock);
+
+  if (!enumObj)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  *_retval = enumObj;
+  NS_ADDREF(*_retval);
+  return NS_OK;
+}
+
+struct writecat_struct {
+  PRFileDesc* fd;
+  PRBool      success;
+};
+
+PLDHashOperator PR_CALLBACK
+enumfunc_categories(const char* aKey, CategoryNode* aCategory, void* userArg)
+{
+  writecat_struct* args = NS_STATIC_CAST(writecat_struct*, userArg);
+
+  PLDHashOperator result = PL_DHASH_NEXT;
+
+  if (!aCategory->WritePersistentEntries(args->fd, aKey)) {
+    args->success = PR_FALSE;
+    result = PL_DHASH_STOP;
+  }
+
+  return result;
+}
+
+NS_METHOD
+nsCategoryManager::WriteCategoryManagerToRegistry(PRFileDesc* fd)
+{
+  writecat_struct args = {
+    fd,
+    PR_TRUE
+  };
+
+  PR_Lock(mLock);
+  mTable.EnumerateRead(enumfunc_categories, &args);
+  PR_Unlock(mLock);
+
+  if (!args.success) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  return NS_OK;
+}
+
+class nsCategoryManagerFactory : public nsIFactory
+   {
+     public:
+       nsCategoryManagerFactory() { }
+
+       NS_DECL_ISUPPORTS
+       NS_DECL_NSIFACTORY
+   };
+
+NS_IMPL_ISUPPORTS1(nsCategoryManagerFactory, nsIFactory)
+
+NS_IMETHODIMP
+nsCategoryManagerFactory::CreateInstance( nsISupports* aOuter, const nsIID& aIID, void** aResult )
+  {
+    NS_ENSURE_ARG_POINTER(aResult);
+
+    *aResult = 0;
+
+    nsresult status = NS_OK;
+    if ( aOuter )
+      status = NS_ERROR_NO_AGGREGATION;
+    else
+      {
+        nsCategoryManager* raw_category_manager = nsCategoryManager::Create();
+        nsCOMPtr<nsICategoryManager> new_category_manager = raw_category_manager;
+        if ( new_category_manager )
+              status = new_category_manager->QueryInterface(aIID, aResult);
+        else
+          status = NS_ERROR_OUT_OF_MEMORY;
+      }
+
+    return status;
+  }
+
+NS_IMETHODIMP
+nsCategoryManagerFactory::LockFactory( PRBool )
+  {
+      // Not implemented...
+    return NS_OK;
+  }
+
+nsresult
+NS_CategoryManagerGetFactory( nsIFactory** aFactory )
+  {
+    // assert(aFactory);
+
+    nsresult status;
+
+    *aFactory = 0;
+    nsIFactory* new_factory = NS_STATIC_CAST(nsIFactory*, new nsCategoryManagerFactory);
+    if (new_factory)
+      {
+        *aFactory = new_factory;
+        NS_ADDREF(*aFactory);
+        status = NS_OK;
+      }
+    else
+      status = NS_ERROR_OUT_OF_MEMORY;
+
+    return status;
+  }
+
+
+
+/*
+ * CreateServicesFromCategory()
+ *
+ * Given a category, this convenience functions enumerates the category and 
+ * creates a service of every CID or ContractID registered under the category.
+ * If observerTopic is non null and the service implements nsIObserver,
+ * this will attempt to notify the observer with the origin, observerTopic string
+ * as parameter.
+ */
+NS_COM nsresult
+NS_CreateServicesFromCategory(const char *category,
+                              nsISupports *origin,
+                              const char *observerTopic)
+{
+    nsresult rv = NS_OK;
+    
+    int nFailed = 0; 
+    nsCOMPtr<nsICategoryManager> categoryManager = 
+        do_GetService("@mozilla.org/categorymanager;1", &rv);
+    if (!categoryManager) return rv;
+
+    nsCOMPtr<nsISimpleEnumerator> enumerator;
+    rv = categoryManager->EnumerateCategory(category, 
+            getter_AddRefs(enumerator));
+    if (NS_FAILED(rv)) return rv;
+
+    nsCOMPtr<nsISupports> entry;
+    while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
+        // From here on just skip any error we get.
+        nsCOMPtr<nsISupportsCString> catEntry = do_QueryInterface(entry, &rv);
+        if (NS_FAILED(rv)) {
+            nFailed++;
+            continue;
+        }
+        nsCAutoString entryString;
+        rv = catEntry->GetData(entryString);
+        if (NS_FAILED(rv)) {
+            nFailed++;
+            continue;
+        }
+        nsXPIDLCString contractID;
+        rv = categoryManager->GetCategoryEntry(category,entryString.get(), getter_Copies(contractID));
+        if (NS_FAILED(rv)) {
+            nFailed++;
+            continue;
+        }
+        
+        nsCOMPtr<nsISupports> instance = do_GetService(contractID, &rv);
+        if (NS_FAILED(rv)) {
+            nFailed++;
+            continue;
+        }
+
+        if (observerTopic) {
+            // try an observer, if it implements it.
+            nsCOMPtr<nsIObserver> observer = do_QueryInterface(instance, &rv);
+            if (NS_SUCCEEDED(rv) && observer)
+                observer->Observe(origin, observerTopic, EmptyString().get());
+        }
+    }
+    return (nFailed ? NS_ERROR_FAILURE : NS_OK);
+}