Implement WebViewDatabase's hasFormData API for chromium based webview.

android_webview/browser/aw_form_database_service.cc

+// Copyright (c) 2013 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 "android_webview/browser/aw_form_database_service.h"
+#include "base/logging.h"
+#include "components/autofill/browser/webdata/autofill_table.h"
+#include "components/webdata/common/webdata_constants.h"
+#include "content/public/browser/browser_thread.h"
+#include "ui/base/l10n/l10n_util_android.h"
+
+using content::BrowserThread;
+
+namespace {
+
+// Callback to handle database error. It seems chrome uses this to
+// display an error dialog box only.
+void DatabaseErrorCallback(sql::InitStatus status) {
+  LOG(WARNING) << "initializing autocomplete database failed";
+}
+
+}  // namespace
+
+namespace android_webview {
+
+AwFormDatabaseService::AwFormDatabaseService(const base::FilePath path)
+    : pending_query_handle_(0),
+      has_form_data_(false),
+      completion_(false, false) {
+
+  web_database_ = new WebDatabaseService(path.Append(kWebDataFilename));
+  web_database_->AddTable(
+      scoped_ptr<WebDatabaseTable>(new autofill::AutofillTable(
+          l10n_util::GetDefaultLocale())));
+  web_database_->LoadDatabase();
+
+  autofill_data_ = new autofill::AutofillWebDataService(
+      web_database_, base::Bind(&DatabaseErrorCallback));
+  autofill_data_->Init();
+}
+
+AwFormDatabaseService::~AwFormDatabaseService() {
+  Shutdown();
+  CancelPendingQuery();

[benm (inactive), 2013/05/07 19:06:55]

These should be the other way around I think? (CancelPendingQuery calls methods
on autofill_data_)

[sgurun-gerrit only, 2013/05/07 19:56:09]

Done.

+}
+
+void AwFormDatabaseService::Shutdown() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  autofill_data_->ShutdownOnUIThread();
+  web_database_->ShutdownDatabase();
+}
+
+void AwFormDatabaseService::CancelPendingQuery() {
+  if (pending_query_handle_) {
+    if (autofill_data_)
+      autofill_data_->CancelRequest(pending_query_handle_);
+    pending_query_handle_ = 0;
+  }
+}
+
+scoped_refptr<autofill::AutofillWebDataService>
+AwFormDatabaseService::get_autofill_webdata_service() {
+  return autofill_data_;
+}
+
+void AwFormDatabaseService::ClearFormData() {
+  base::Time begin;
+  base::Time end = base::Time::Max();
+  autofill_data_->RemoveFormElementsAddedBetween(begin, end);
+  autofill_data_->RemoveAutofillDataModifiedBetween(begin, end);
+}
+
+bool AwFormDatabaseService::HasFormData() {
+  BrowserThread::PostTask(BrowserThread::DB, FROM_HERE,
+      base::Bind(&AwFormDatabaseService::HasFormDataImpl,
+                 base::Unretained(this)));
+  completion_.Wait();
+  return has_form_data_;
+}
+
+void AwFormDatabaseService::HasFormDataImpl() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
+  has_form_data_ = false;
+  pending_query_handle_ = autofill_data_->HasFormElements(this);
+}
+
+
+void AwFormDatabaseService::OnWebDataServiceRequestDone(
+    WebDataServiceBase::Handle h,
+    const WDTypedResult* result) {
+
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
+  DCHECK_EQ(pending_query_handle_, h);
+  pending_query_handle_ = 0;
+

[benm (inactive), 2013/05/07 19:06:55]

maybe for clarity we should set has_form_data_ to false here before we test
result (i.e. move it from line 83)

[sgurun-gerrit only, 2013/05/07 19:56:09]

Done.

+  if (result) {
+    DCHECK_EQ(AUTOFILL_VALUE_RESULT, result->GetType());
+    const WDResult<bool>* autofill_result =
+        static_cast<const WDResult<bool>*>(result);
+    has_form_data_ = autofill_result->GetValue();
+  }
+  completion_.Signal();
+}
+
+}  // namespace android_webview