1 files changed, 211 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp b/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp
new file mode 100644
index 00000000..51fb04b5
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/ds/nsObserverList.cpp
@@ -0,0 +1,211 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** 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) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * 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 NS_WEAK_OBSERVERS
+
+#include "pratom.h"
+#include "nsString.h"
+#include "nsAutoLock.h"
+#include "nsCOMPtr.h"
+#include "nsIWeakReference.h"
+#include "nsEnumeratorUtils.h"
+#include "nsObserverList.h"
+
+nsObserverList::nsObserverList()
+{
+    MOZ_COUNT_CTOR(nsObserverList);
+    mLock = PR_NewLock();
+}
+
+nsObserverList::~nsObserverList(void)
+{
+    MOZ_COUNT_DTOR(nsObserverList);
+    PR_DestroyLock(mLock);
+}
+
+nsresult
+nsObserverList::AddObserver(nsIObserver* anObserver, PRBool ownsWeak)
+{
+    nsresult rv;
+    PRBool inserted;
+    
+    NS_ENSURE_ARG(anObserver);
+
+    nsAutoLock lock(mLock);
+
+    if (!mObserverList) {
+        rv = NS_NewISupportsArray(getter_AddRefs(mObserverList));
+        if (NS_FAILED(rv)) return rv;
+    }
+
+#ifdef NS_WEAK_OBSERVERS
+    nsCOMPtr<nsISupports> observerRef;
+    if (ownsWeak) {
+        nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
+        NS_ASSERTION(weakRefFactory, "AddObserver: trying weak object that doesnt support nsIWeakReference");
+        if ( weakRefFactory )
+            observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
+    } else {
+#if DEBUG_dougt_xxx
+        // if you are hitting this assertion, contact dougt@netscape.com.  There may be a ownership problem caused by his checkin to freeze nsIObserver
+        nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
+        NS_ASSERTION(!weakRefFactory, "Your object supports weak references, but is being added with a strong reference");
+#endif
+        observerRef = anObserver;
+    }
+    if (!observerRef)
+        return NS_ERROR_FAILURE;
+
+    inserted = mObserverList->AppendElement(observerRef); 
+#else
+    if (*anObserver)
+        inserted = mObserverList->AppendElement(*anObserver);
+#endif
+    return inserted ? NS_OK : NS_ERROR_FAILURE;
+}
+
+nsresult
+nsObserverList::RemoveObserver(nsIObserver* anObserver)
+{
+    PRBool removed = PR_FALSE;
+    
+    NS_ENSURE_ARG(anObserver);
+
+    nsAutoLock lock(mLock);
+
+    if (!mObserverList)
+       return NS_ERROR_FAILURE;
+    
+#ifdef NS_WEAK_OBSERVERS
+    nsCOMPtr<nsISupportsWeakReference> weakRefFactory = do_QueryInterface(anObserver);
+    nsCOMPtr<nsISupports> observerRef;
+    if (weakRefFactory) {
+        observerRef = getter_AddRefs(NS_STATIC_CAST(nsISupports*, NS_GetWeakReference(weakRefFactory)));
+        if (observerRef)
+            removed = mObserverList->RemoveElement(observerRef);
+        if (!removed)
+            observerRef = anObserver;
+    } else
+        observerRef = anObserver;
+
+    if (!removed && observerRef)
+        removed = mObserverList->RemoveElement(observerRef);  
+#else
+    if (*anObserver)
+        removed = mObserverList->RemoveElement(*anObserver);
+#endif
+    return removed ? NS_OK : NS_ERROR_FAILURE;
+}
+
+nsresult
+nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator)
+{
+    nsAutoLock lock(mLock);
+
+    ObserverListEnumerator * enumerator= new ObserverListEnumerator(mObserverList);
+    *anEnumerator = enumerator;
+    if (!enumerator)
+        return NS_ERROR_OUT_OF_MEMORY;
+
+    NS_ADDREF(enumerator);
+    return NS_OK;
+}
+
+
+ObserverListEnumerator::ObserverListEnumerator(nsISupportsArray* aValueArray)
+    : mValueArray(aValueArray), mIndex(0)
+{
+    if (mValueArray) {
+        NS_ADDREF(mValueArray);
+        PRUint32 total;
+        mValueArray->Count(&total);
+        mIndex = PRInt32(total);
+    }
+}
+
+ObserverListEnumerator::~ObserverListEnumerator(void)
+{
+    NS_IF_RELEASE(mValueArray);
+}
+
+NS_IMPL_ISUPPORTS1(ObserverListEnumerator, nsISimpleEnumerator)
+
+NS_IMETHODIMP
+ObserverListEnumerator::HasMoreElements(PRBool* aResult)
+{
+    NS_PRECONDITION(aResult != 0, "null ptr");
+    if (! aResult)
+        return NS_ERROR_NULL_POINTER;
+
+    if (!mValueArray) {
+        *aResult = PR_FALSE;
+        return NS_OK;
+    }
+
+    *aResult = (mIndex > 0);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+ObserverListEnumerator::GetNext(nsISupports** aResult)
+{
+    NS_PRECONDITION(aResult != 0, "null ptr");
+    if (! aResult)
+        return NS_ERROR_NULL_POINTER;
+
+    if (!mValueArray) {
+        *aResult = nsnull;
+        return NS_OK;
+    }
+
+    if (mIndex <= 0 )
+        return NS_ERROR_UNEXPECTED;
+
+    mValueArray->GetElementAt(--mIndex, aResult);
+    if (*aResult) {
+        nsCOMPtr<nsIWeakReference> weakRefFactory = do_QueryInterface(*aResult);
+        if ( weakRefFactory ) {
+            nsCOMPtr<nsISupports> weakref = do_QueryReferent(weakRefFactory);
+            NS_RELEASE(*aResult);
+            NS_IF_ADDREF(*aResult = weakref);
+
+            return NS_OK;
+        }
+    }
+
+    return NS_OK;
+}