continue work-in-progress with freezable array.

Also introduce nsCOMArray<nsIFoo>
not part of build

xpcom/glue/nsCOMArray.h

@@ -0,0 +1,140 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: NPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Netscape 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/NPL/
+ *
+ * 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 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 NPL, 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 NPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsCOMArray_h__
+#define nsCOMArray_h__
+
+#include "nsVoidArray.h"
+#include "nsISupports.h"
+
+// a non-XPCOM, refcounting array of XPCOM objects
+// used as a member variable or stack variable - this object is NOT
+// refcounted, but the objects that it holds are
+template <class T>
+class NS_COM nsCOMArray
+{
+ public:
+    nsCOMArray() {}
+    nsCOMArray(PRInt32 aCount) : mArray(aCount) {}
+
+    ~nsCOMArray() {}
+
+    // these do NOT refcount on the way out, for speed
+    T* ObjectAt(PRInt32 aIndex) const {
+        return NS_STATIC_CAST(T*,mArray.ElementAt(aIndex));
+    }
+    
+    T* operator[](PRInt32 aIndex) const {
+        return ObjectAt(aIndex);
+    }
+
+    PRInt32 IndexOf(T* aObject) {
+        return mArray.IndexOf(aObject);
+    }
+    
+    PRBool InsertObjectAt(T* aObject, PRInt32 aIndex) {
+        PRBool result = mArray.InsertElementAt(aObject, aIndex);
+        if (result)
+            NS_ADDREF(aObject);
+        return result;
+    }
+    
+    PRBool ReplaceObjectAt(T* aObject, PRInt32 aIndex) {
+        T *oldObject = ObjectAt(aIndex);
+        NS_IF_RELEASE(oldObject);
+        PRBool result = mArray.ReplaceElementAt(aObject, aIndex);
+        if (result)
+            NS_ADDREF(aObject);
+        return result;
+    }
+
+    // override nsVoidArray stuff so that they can be accessed by
+    // other methods
+    PRInt32 Count() const {
+        return mArray.Count();
+    }
+
+    void Clear() {
+        mArray.EnumerateForwards(ClearObjectsCallback, nsnull);
+        mArray.Clear();
+    }
+
+    PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData) {
+        return mArray.EnumerateForwards(aFunc, aData);
+    }
+    
+    PRBool AppendObject(T *aObject) {
+        PRBool result = InsertObjectAt(aObject, Count());
+        if (result)
+            NS_ADDREF(aObject);
+        return result;
+    }
+
+    PRBool RemoveObject(T *aObject) {
+        PRBool result = mArray.RemoveElement(aObject);
+        if (result)
+            NS_RELEASE(aObject);
+        return result;
+    }
+    
+    PRBool RemoveObjectAt(PRInt32 aIndex) {
+        T* element = ObjectAt(aIndex);
+        if (element) {
+            PRBool result = mArray.RemoveElementAt(aIndex);
+            if (result)
+                NS_RELEASE(element);
+            return result;
+        }
+        return PR_FALSE;
+    }
+
+
+ private:
+    
+    static PRBool ClearObjectsCallback(void *aElement, void*) {
+        T* element = NS_STATIC_CAST(nsISupports*, aElement);
+        NS_RELEASE(element);
+        return PR_TRUE;
+    }
+
+    nsCOMArray(const nsCOMArray& other);
+    nsCOMArray& operator=(const nsCOMArray& other);
+    nsVoidArray mArray;
+};
+
+
+#endif