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

webkit/dom_storage/dom_storage_host.cc

+// 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 "webkit/dom_storage/dom_storage_host.h"
+
+#include "googleurl/src/gurl.h"
+#include "webkit/dom_storage/dom_storage_area.h"
+#include "webkit/dom_storage/dom_storage_context.h"
+#include "webkit/dom_storage/dom_storage_namespace.h"
+#include "webkit/dom_storage/dom_storage_types.h"
+
+namespace dom_storage {
+
+DomStorageHost::DomStorageHost(DomStorageContext* context)
+    : last_connection_id_(0),
+      context_(context) {
+}
+
+DomStorageHost::~DomStorageHost() {
+  AreaMap::const_iterator it = connections_.begin();
+  for (; it != connections_.end(); ++it)
+    it->second.namespace_->CloseStorageArea(it->second.area_);
+}
+
+// TODO(michaeln): have the caller pass in the 'connection_id' value
+// instead of generating them here, avoids a sync ipc on open.
+int DomStorageHost::OpenStorageArea(int namespace_id, const GURL& origin) {
+  NamespaceAndArea references;
+  references.namespace_ = context_->GetStorageNamespace(namespace_id);
+  if (!references.namespace_)
+    return kInvalidAreaId;
+  references.area_ = references.namespace_->OpenStorageArea(origin);
+  if (!references.area_)
+    return kInvalidAreaId;
+  int id = ++last_connection_id_;
+  connections_[id] = references;
+  return id;
+}
+
+void DomStorageHost::CloseStorageArea(int connection_id) {
+  AreaMap::iterator found = connections_.find(connection_id);
+  if (found == connections_.end())
+    return;
+  found->second.namespace_->CloseStorageArea(
+      found->second.area_);
+  connections_.erase(found);
+}
+
+unsigned DomStorageHost::GetAreaLength(int connection_id) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return 0;
+  return area->Length();
+}
+
+NullableString16 DomStorageHost::GetAreaKey(int connection_id, unsigned index) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return NullableString16(true);
+  return area->Key(index);
+}
+
+NullableString16 DomStorageHost::GetAreaItem(int connection_id,
+                                             const string16& key) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return NullableString16(true);
+  return area->GetItem(key);
+}
+
+bool DomStorageHost::SetAreaItem(
+    int connection_id, const string16& key,
+    const string16& value, const GURL& page_url,
+    NullableString16* old_value) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return false;
+  if (!area->SetItem(key, value, old_value))
+    return false;
+  if ((area->namespace_id() == kLocalStorageNamespaceId) &&
+      (old_value->is_null() || old_value->string() != value)) {
+    context_->NotifyItemSet(area, key, value, *old_value, page_url);
+  }
+  return true;
+}
+
+bool DomStorageHost::RemoveAreaItem(
+    int connection_id, const string16& key, const GURL& page_url,
+    string16* old_value) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return false;
+  if (!area->RemoveItem(key, old_value))
+    return false;
+  if (area->namespace_id() == kLocalStorageNamespaceId)
+    context_->NotifyItemRemoved(area, key, *old_value, page_url);
+  return true;
+}
+
+bool DomStorageHost::ClearArea(int connection_id, const GURL& page_url) {
+  DomStorageArea* area = GetOpenArea(connection_id);
+  if (!area)
+    return false;
+  if (!area->Clear())
+    return false;
+  if (area->namespace_id() == kLocalStorageNamespaceId)
+    context_->NotifyAreaCleared(area, page_url);
+  return true;
+}
+
+DomStorageArea* DomStorageHost::GetOpenArea(int connection_id) {
+  AreaMap::iterator found = connections_.find(connection_id);
+  if (found == connections_.end())
+    return NULL;
+  return found->second.area_;
+}
+
+// NamespaceAndArea
+
+DomStorageHost::NamespaceAndArea::NamespaceAndArea() {}
+DomStorageHost::NamespaceAndArea::~NamespaceAndArea() {}
+
+}  // namespace dom_storage