storage/browser/fileapi/isolated_file_system_backend.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "storage/browser/fileapi/isolated_file_system_backend.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/files/file_path.h"
  11 #include "base/files/file_util_proxy.h"
  12 #include "base/logging.h"
  13 #include "base/message_loop/message_loop_proxy.h"
  14 #include "base/sequenced_task_runner.h"
  15 #include "storage/browser/blob/file_stream_reader.h"
  16 #include "storage/browser/fileapi/async_file_util_adapter.h"
  17 #include "storage/browser/fileapi/copy_or_move_file_validator.h"
  18 #include "storage/browser/fileapi/dragged_file_util.h"
  19 #include "storage/browser/fileapi/file_stream_writer.h"
  20 #include "storage/browser/fileapi/file_system_context.h"
  21 #include "storage/browser/fileapi/file_system_operation.h"
  22 #include "storage/browser/fileapi/file_system_operation_context.h"
  23 #include "storage/browser/fileapi/isolated_context.h"
  24 #include "storage/browser/fileapi/native_file_util.h"
  25 #include "storage/browser/fileapi/transient_file_util.h"
  26 #include "storage/browser/fileapi/watcher_manager.h"
  27 #include "storage/common/fileapi/file_system_types.h"
  28 #include "storage/common/fileapi/file_system_util.h"
  29
  30 namespace storage {
  31
  32 IsolatedFileSystemBackend::IsolatedFileSystemBackend(
  33     bool use_for_type_native_local,
  34     bool use_for_type_platform_app)
  35     : use_for_type_native_local_(use_for_type_native_local),
  36       use_for_type_platform_app_(use_for_type_platform_app),
  37       isolated_file_util_(new AsyncFileUtilAdapter(new LocalFileUtil())),
  38       dragged_file_util_(new AsyncFileUtilAdapter(new DraggedFileUtil())),
  39       transient_file_util_(new AsyncFileUtilAdapter(new TransientFileUtil())) {
  40 }
  41
  42 IsolatedFileSystemBackend::~IsolatedFileSystemBackend() {
  43 }
  44
  45 bool IsolatedFileSystemBackend::CanHandleType(FileSystemType type) const {
  46   switch (type) {
  47     case kFileSystemTypeIsolated:
  48     case kFileSystemTypeDragged:
  49     case kFileSystemTypeForTransientFile:
  50       return true;
  51     case kFileSystemTypeNativeLocal:
  52       return use_for_type_native_local_;
  53     case kFileSystemTypeNativeForPlatformApp:
  54       return use_for_type_platform_app_;
  55     default:
  56       return false;
  57   }
  58 }
  59
  60 void IsolatedFileSystemBackend::Initialize(FileSystemContext* context) {
  61 }
  62
  63 void IsolatedFileSystemBackend::ResolveURL(
  64     const FileSystemURL& url,
  65     OpenFileSystemMode mode,
  66     const OpenFileSystemCallback& callback) {
  67   // We never allow opening a new isolated FileSystem via usual ResolveURL.
  68   base::MessageLoopProxy::current()->PostTask(
  69       FROM_HERE,
  70       base::Bind(callback,
  71                  GURL(),
  72                  std::string(),
  73                  base::File::FILE_ERROR_SECURITY));
  74 }
  75
  76 AsyncFileUtil* IsolatedFileSystemBackend::GetAsyncFileUtil(
  77     FileSystemType type) {
  78   switch (type) {
  79     case kFileSystemTypeNativeLocal:
  80       return isolated_file_util_.get();
  81     case kFileSystemTypeDragged:
  82       return dragged_file_util_.get();
  83     case kFileSystemTypeForTransientFile:
  84       return transient_file_util_.get();
  85     default:
  86       NOTREACHED();
  87   }
  88   return NULL;
  89 }
  90
  91 WatcherManager* IsolatedFileSystemBackend::GetWatcherManager(
  92     FileSystemType type) {
  93   return NULL;
  94 }
  95
  96 CopyOrMoveFileValidatorFactory*
  97 IsolatedFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
  98     FileSystemType type, base::File::Error* error_code) {
  99   DCHECK(error_code);
 100   *error_code = base::File::FILE_OK;
 101   return NULL;
 102 }
 103
 104 FileSystemOperation* IsolatedFileSystemBackend::CreateFileSystemOperation(
 105     const FileSystemURL& url,
 106     FileSystemContext* context,
 107     base::File::Error* error_code) const {
 108   return FileSystemOperation::Create(
 109       url, context, make_scoped_ptr(new FileSystemOperationContext(context)));
 110 }
 111
 112 bool IsolatedFileSystemBackend::SupportsStreaming(
 113     const storage::FileSystemURL& url) const {
 114   return false;
 115 }
 116
 117 bool IsolatedFileSystemBackend::HasInplaceCopyImplementation(
 118     storage::FileSystemType type) const {
 119   DCHECK(type == kFileSystemTypeNativeLocal || type == kFileSystemTypeDragged ||
 120          type == kFileSystemTypeForTransientFile);
 121   return false;
 122 }
 123
 124 scoped_ptr<storage::FileStreamReader>
 125 IsolatedFileSystemBackend::CreateFileStreamReader(
 126     const FileSystemURL& url,
 127     int64 offset,
 128     int64 max_bytes_to_read,
 129     const base::Time& expected_modification_time,
 130     FileSystemContext* context) const {
 131   return scoped_ptr<storage::FileStreamReader>(
 132       storage::FileStreamReader::CreateForLocalFile(
 133           context->default_file_task_runner(),
 134           url.path(),
 135           offset,
 136           expected_modification_time));
 137 }
 138
 139 scoped_ptr<FileStreamWriter> IsolatedFileSystemBackend::CreateFileStreamWriter(
 140     const FileSystemURL& url,
 141     int64 offset,
 142     FileSystemContext* context) const {
 143   return scoped_ptr<FileStreamWriter>(
 144       FileStreamWriter::CreateForLocalFile(
 145           context->default_file_task_runner(),
 146           url.path(),
 147           offset,
 148           FileStreamWriter::OPEN_EXISTING_FILE));
 149 }
 150
 151 FileSystemQuotaUtil* IsolatedFileSystemBackend::GetQuotaUtil() {
 152   // No quota support.
 153   return NULL;
 154 }
 155
 156 const UpdateObserverList* IsolatedFileSystemBackend::GetUpdateObservers(
 157     FileSystemType type) const {
 158   return NULL;
 159 }
 160
 161 const ChangeObserverList* IsolatedFileSystemBackend::GetChangeObservers(
 162     FileSystemType type) const {
 163   return NULL;
 164 }
 165
 166 const AccessObserverList* IsolatedFileSystemBackend::GetAccessObservers(
 167     FileSystemType type) const {
 168   return NULL;
 169 }
 170
 171 }  // namespace storage