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-rw-r--r--docshell/base/nsDocShellEnumerator.cpp85
1 files changed, 85 insertions, 0 deletions
diff --git a/docshell/base/nsDocShellEnumerator.cpp b/docshell/base/nsDocShellEnumerator.cpp
new file mode 100644
index 0000000000..5ad0ad35e6
--- /dev/null
+++ b/docshell/base/nsDocShellEnumerator.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsDocShellEnumerator.h"
+
+#include "nsDocShell.h"
+
+using namespace mozilla;
+
+nsDocShellEnumerator::nsDocShellEnumerator(
+ nsDocShellEnumerator::EnumerationDirection aDirection,
+ int32_t aDocShellType, nsDocShell& aRootItem)
+ : mRootItem(&aRootItem),
+ mDocShellType(aDocShellType),
+ mDirection(aDirection) {}
+
+nsresult nsDocShellEnumerator::BuildDocShellArray(
+ nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+ MOZ_ASSERT(mRootItem);
+
+ aItemArray.Clear();
+
+ if (mDirection == EnumerationDirection::Forwards) {
+ return BuildArrayRecursiveForwards(mRootItem, aItemArray);
+ }
+ MOZ_ASSERT(mDirection == EnumerationDirection::Backwards);
+ return BuildArrayRecursiveBackwards(mRootItem, aItemArray);
+}
+
+nsresult nsDocShellEnumerator::BuildArrayRecursiveForwards(
+ nsDocShell* aItem, nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+ nsresult rv;
+
+ // add this item to the array
+ if (mDocShellType == nsIDocShellTreeItem::typeAll ||
+ aItem->ItemType() == mDocShellType) {
+ if (!aItemArray.AppendElement(aItem, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+
+ int32_t numChildren = aItem->ChildCount();
+
+ for (int32_t i = 0; i < numChildren; ++i) {
+ RefPtr<nsDocShell> curChild = aItem->GetInProcessChildAt(i);
+ MOZ_ASSERT(curChild);
+
+ rv = BuildArrayRecursiveForwards(curChild, aItemArray);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ }
+
+ return NS_OK;
+}
+
+nsresult nsDocShellEnumerator::BuildArrayRecursiveBackwards(
+ nsDocShell* aItem, nsTArray<RefPtr<nsIDocShell>>& aItemArray) {
+ nsresult rv;
+
+ uint32_t numChildren = aItem->ChildCount();
+
+ for (int32_t i = numChildren - 1; i >= 0; --i) {
+ RefPtr<nsDocShell> curChild = aItem->GetInProcessChildAt(i);
+ MOZ_ASSERT(curChild);
+
+ rv = BuildArrayRecursiveBackwards(curChild, aItemArray);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ }
+
+ // add this item to the array
+ if (mDocShellType == nsIDocShellTreeItem::typeAll ||
+ aItem->ItemType() == mDocShellType) {
+ if (!aItemArray.AppendElement(aItem, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+
+ return NS_OK;
+}