Adding `browsing_data_filesystem_helper*` as the first step towards content settings UI.

chrome/browser/browsing_data_file_system_helper.cc

Index: chrome/browser/browsing_data_file_system_helper.cc
diff --git a/chrome/browser/browsing_data_file_system_helper.cc b/chrome/browser/browsing_data_file_system_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..36705c22e6aed431fbdc12969a38516f58bdd235
--- /dev/null
+++ b/chrome/browser/browsing_data_file_system_helper.cc
@@ -0,0 +1,269 @@
+// Copyright (c) 2011 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 "chrome/browser/browsing_data_file_system_helper.h"
+
+#include "base/file_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/browser/browser_thread.h"
+#include "content/browser/in_process_webkit/webkit_context.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebCString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
+#include "webkit/fileapi/file_system_context.h"
+#include "webkit/fileapi/file_system_types.h"
+#include "webkit/fileapi/sandbox_mount_point_provider.h"
+#include "webkit/glue/webkit_glue.h"
+
+using WebKit::WebSecurityOrigin;
+
+namespace {
+
+class BrowsingDataFileSystemHelperImpl : public BrowsingDataFileSystemHelper {
+ public:
+  explicit BrowsingDataFileSystemHelperImpl(Profile* profile);
+
+  virtual void StartFetching(
+      Callback1<const std::vector<FileSystemInfo>& >::Type* callback);
+  virtual void CancelNotification();
+  virtual void DeleteFileSystemOrigin(const GURL& origin);
+
+ private:
+  virtual ~BrowsingDataFileSystemHelperImpl();
+
+  // Enumerates all filesystem files in the FILE thread.
+  void FetchFileSystemInfoInFileThread();
+  // Notifies the completion callback in the UI thread.
+  void NotifyInUIThread();
+  // Delete data for an origin on the FILE thread.
+  void DeleteFileSystemOriginInFileThread(const GURL& origin);
+
+  Profile* profile_;
+
+  // This only mutates in the FILE thread.
+  std::vector<FileSystemInfo> file_system_info_;
+
+  // This only mutates on the UI thread.
+  scoped_ptr<Callback1<const std::vector<FileSystemInfo>& >::Type >
+      completion_callback_;
+
+  // Indicates whether or not we're currently fetching information:
+  // it's true when StartFetching() is called in the UI thread, and it's reset
+  // after we notified the callback in the UI thread.
+  // This only mutates on the UI thread.
+  bool is_fetching_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowsingDataFileSystemHelperImpl);
+};
+
+BrowsingDataFileSystemHelperImpl::BrowsingDataFileSystemHelperImpl(
+    Profile* profile)
+    : profile_(profile),
+      is_fetching_(false) {
+  DCHECK(profile_);
+}
+
+BrowsingDataFileSystemHelperImpl::~BrowsingDataFileSystemHelperImpl() {
+}
+
+void BrowsingDataFileSystemHelperImpl::StartFetching(
+    Callback1<const std::vector<FileSystemInfo>& >::Type* callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(!is_fetching_);
+  DCHECK(callback);
+  is_fetching_ = true;
+  completion_callback_.reset(callback);
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      NewRunnableMethod(
+          this,
+          &BrowsingDataFileSystemHelperImpl::
+              FetchFileSystemInfoInFileThread));
+}
+
+void BrowsingDataFileSystemHelperImpl::CancelNotification() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  completion_callback_.reset(NULL);
+}
+
+void BrowsingDataFileSystemHelperImpl::DeleteFileSystemOrigin(
+    const GURL& origin) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+       NewRunnableMethod(
+           this,
+           &BrowsingDataFileSystemHelperImpl::
+               DeleteFileSystemOriginInFileThread,
+           origin));
+}
+
+void BrowsingDataFileSystemHelperImpl::FetchFileSystemInfoInFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  scoped_ptr<fileapi::SandboxMountPointProvider::OriginEnumerator>
+      origin_enumerator(profile_->GetFileSystemContext()->path_manager()->
+          sandbox_provider()->CreateOriginEnumerator());
+
+  GURL current;
+  while (!(current = origin_enumerator->Next()).is_empty()) {
+    if (current.SchemeIs(chrome::kExtensionScheme)) {
+      // Extension state is not considered browsing data.
+      continue;
+    }
+    file_system_info_.push_back(
+        FileSystemInfo(
+            current,
+            origin_enumerator->HasFileSystemType(
+                fileapi::kFileSystemTypePersistent),
+            origin_enumerator->HasFileSystemType(
+                fileapi::kFileSystemTypeTemporary)));
+  }
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(
+          this, &BrowsingDataFileSystemHelperImpl::NotifyInUIThread));
+}
+
+void BrowsingDataFileSystemHelperImpl::NotifyInUIThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(is_fetching_);
+  // Note: completion_callback_ mutates only in the UI thread, so it's safe to
+  // test it here.
+  if (completion_callback_ != NULL) {
+    completion_callback_->Run(file_system_info_);
+    completion_callback_.reset();
+  }
+  is_fetching_ = false;
+}
+
+void BrowsingDataFileSystemHelperImpl::DeleteFileSystemOriginInFileThread(
+    const GURL& origin) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  scoped_refptr<fileapi::FileSystemContext>
+      context(profile_->GetFileSystemContext());
+  context->DeleteDataForOriginOnFileThread(origin);
+}
+
+}  // namespace
+
+BrowsingDataFileSystemHelper::FileSystemInfo::FileSystemInfo(
+    const GURL& origin,
+    bool has_persistent,
+    bool has_temporary)
+    : origin(origin),
+      has_persistent(has_persistent),
+      has_temporary(has_temporary) {
+}
+
+BrowsingDataFileSystemHelper::FileSystemInfo::~FileSystemInfo() {}
+
+// static
+BrowsingDataFileSystemHelper* BrowsingDataFileSystemHelper::Create(
+    Profile* profile) {
+  return new BrowsingDataFileSystemHelperImpl(profile);
+}
+
+CannedBrowsingDataFileSystemHelper::
+PendingFileSystemInfo::PendingFileSystemInfo() {
+}
+
+CannedBrowsingDataFileSystemHelper::
+PendingFileSystemInfo::PendingFileSystemInfo(const GURL& origin,
+                                             const fileapi::FileSystemType type)
+    : origin(origin),
+      type(type) {
+}
+
+CannedBrowsingDataFileSystemHelper::
+PendingFileSystemInfo::~PendingFileSystemInfo() {
+}
+
+CannedBrowsingDataFileSystemHelper::CannedBrowsingDataFileSystemHelper(
+    Profile* profile)
+    : profile_(profile),
+      is_fetching_(false) {
+  DCHECK(profile);
+}
+
+CannedBrowsingDataFileSystemHelper::~CannedBrowsingDataFileSystemHelper() {}
+
+CannedBrowsingDataFileSystemHelper*
+    CannedBrowsingDataFileSystemHelper::Clone() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  CannedBrowsingDataFileSystemHelper* clone =
+      new CannedBrowsingDataFileSystemHelper(profile_);
+
+  clone->pending_file_system_info_ = pending_file_system_info_;
+  clone->file_system_info_ = file_system_info_;
+  return clone;
+}
+
+void CannedBrowsingDataFileSystemHelper::AddFileSystem(
+    const GURL& origin, const fileapi::FileSystemType type) {
+  pending_file_system_info_.push_back(PendingFileSystemInfo(origin, type));
+}
+
+void CannedBrowsingDataFileSystemHelper::Reset() {
+  file_system_info_.clear();
+  pending_file_system_info_.clear();
+}
+
+bool CannedBrowsingDataFileSystemHelper::empty() const {
+  return file_system_info_.empty() && pending_file_system_info_.empty();
+}
+
+void CannedBrowsingDataFileSystemHelper::StartFetching(
+    Callback1<const std::vector<FileSystemInfo>& >::Type* callback) {
+  DCHECK(!is_fetching_);
+  DCHECK(callback);
+  is_fetching_ = true;
+  completion_callback_.reset(callback);
+
+  for (std::vector<PendingFileSystemInfo>::const_iterator
+       info = pending_file_system_info_.begin();
+       info != pending_file_system_info_.end(); ++info) {
+    bool duplicate = false;
+    for (std::vector<FileSystemInfo>::iterator
+             file_system = file_system_info_.begin();
+         file_system != file_system_info_.end();
+         ++file_system) {
+      if (file_system->origin == info->origin) {
+        if (info->type == fileapi::kFileSystemTypePersistent) {
+          file_system->has_persistent = true;
+        } else {
+          file_system->has_temporary = true;
+        }
+        duplicate = true;
+        break;
+      }
+    }
+    if (duplicate)
+      continue;
+
+    file_system_info_.push_back(FileSystemInfo(
+        info->origin,
+        (info->type == fileapi::kFileSystemTypePersistent),
+        (info->type == fileapi::kFileSystemTypeTemporary)));
+  }
+  pending_file_system_info_.clear();
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(
+          this, &CannedBrowsingDataFileSystemHelper::Notify));
+}
+
+void CannedBrowsingDataFileSystemHelper::Notify() {
+  DCHECK(is_fetching_);
+  if (completion_callback_ != NULL) {
+    completion_callback_->Run(file_system_info_);
+    completion_callback_.reset();
+  }
+  is_fetching_ = false;
+}