Framing for a DOMStorage backend that does not depend on in-process-webkit.

webkit/dom_storage/dom_storage_area.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/browser/in_process_webkit/dom_storage_area.h"
+#include "webkit/dom_storage/dom_storage_area.h"
+#include "webkit/dom_storage/dom_storage_map.h"
+#include "webkit/dom_storage/dom_storage_namespace.h"
 
-#include "base/logging.h"
-#include "content/browser/in_process_webkit/dom_storage_context.h"
-#include "content/browser/in_process_webkit/dom_storage_namespace.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageArea.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
-#include "webkit/glue/webkit_glue.h"
+namespace dom_storage {
 
-using WebKit::WebSecurityOrigin;
-using WebKit::WebStorageArea;
-using WebKit::WebString;
-using WebKit::WebURL;
-
-DOMStorageArea::DOMStorageArea(
-    const string16& origin,
-    int64 id,
-    DOMStorageNamespace* owner)
-    : origin_(origin),
-      origin_url_(origin),
-      id_(id),
-      owner_(owner) {
-  DCHECK(owner_);
+DomStorageArea::DomStorageArea(
+    int64 namespace_id, const GURL& origin,
+    const FilePath& directory, DomStorageTaskRunner* task_runner)
+    : namespace_id_(namespace_id), origin_(origin),
+      directory_(directory), task_runner_(task_runner),
+      map_(new DomStorageMap()) {
 }
 
-DOMStorageArea::~DOMStorageArea() {
+DomStorageArea::~DomStorageArea() {
 }
 
-unsigned DOMStorageArea::Length() {
-  CreateWebStorageAreaIfNecessary();
-  return storage_area_->length();
+unsigned DomStorageArea::Length() {
+  return map_->Length();
 }
 
-NullableString16 DOMStorageArea::Key(unsigned index) {
-  CreateWebStorageAreaIfNecessary();
-  return storage_area_->key(index);
+NullableString16 DomStorageArea::Key(unsigned index) {
+  return map_->Key(index);
 }
 
-NullableString16 DOMStorageArea::GetItem(const string16& key) {
-  CreateWebStorageAreaIfNecessary();
-  return storage_area_->getItem(key);
+NullableString16 DomStorageArea::GetItem(const string16& key) {
+  return map_->GetItem(key);
 }
 
-NullableString16 DOMStorageArea::SetItem(
+bool DomStorageArea::SetItem(
     const string16& key, const string16& value,
-    WebStorageArea::Result* result) {
-  CreateWebStorageAreaIfNecessary();
-  WebString old_value;
-  storage_area_->setItem(key, value, WebURL(), *result, old_value);
-  return old_value;
+    NullableString16* old_value) {
+  if (!map_->HasOneRef())
+    map_ = map_->DeepCopy();
+  return map_->SetItem(key, value, old_value);
 }
 
-NullableString16 DOMStorageArea::RemoveItem(const string16& key) {
-  CreateWebStorageAreaIfNecessary();
-  WebString old_value;
-  storage_area_->removeItem(key, WebURL(), old_value);
-  return old_value;
+bool DomStorageArea::RemoveItem(
+    const string16& key,
+    string16* old_value) {
+  if (!map_->HasOneRef())
+    map_ = map_->DeepCopy();
+  return map_->RemoveItem(key, old_value);
 }
 
-bool DOMStorageArea::Clear() {
-  CreateWebStorageAreaIfNecessary();
-  bool somethingCleared;
-  storage_area_->clear(WebURL(), somethingCleared);
-  return somethingCleared;
+bool DomStorageArea::Clear() {
+  if (map_->Length() == 0)
+    return false;
+  map_ = new DomStorageMap();
+  return true;
 }
 
-void DOMStorageArea::PurgeMemory() {
-  storage_area_.reset();
+DomStorageArea* DomStorageArea::ShallowCopy(int64 destination_namespace_id) {
+  DCHECK_NE(kLocalStorageNamespaceId, namespace_id_);
+  DCHECK_NE(kLocalStorageNamespaceId, destination_namespace_id);
+  // SessionNamespaces aren't backed by files on disk.
+  DomStorageArea* copy = new DomStorageArea(destination_namespace_id, origin_,
+                                            FilePath(), task_runner_);
+  copy->map_ = map_;
+  return copy;
 }
 
-void DOMStorageArea::CreateWebStorageAreaIfNecessary() {
-  if (!storage_area_.get())
-    storage_area_.reset(owner_->CreateWebStorageArea(origin_));
-}
+}  // namespace dom_storage