Implement async version of WebFileSystem::createFileWriter

content/child/fileapi/webfilesystem_impl.cc

 // Copyright 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 "content/child/fileapi/webfilesystem_impl.h"
 
 #include "base/bind.h"
 #include "content/child/child_thread.h"
 #include "content/child/fileapi/file_system_dispatcher.h"
 #include "content/child/fileapi/webfilesystem_callback_adapters.h"
 #include "content/child/fileapi/webfilewriter_impl.h"
 #include "third_party/WebKit/public/web/WebFileSystemCallbacks.h"
 #include "third_party/WebKit/public/platform/WebFileInfo.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "webkit/glue/webkit_glue.h"
 
 using WebKit::WebFileInfo;
 using WebKit::WebFileSystemCallbacks;
 using WebKit::WebFileSystemEntry;
 using WebKit::WebString;
 using WebKit::WebURL;
 using WebKit::WebVector;
 
 namespace content {
 
+namespace {
+
+void DidReadMetadataForCreateFileWriter(
+    const GURL& path,
+    WebKit::WebFileWriterClient* client,
+    WebKit::WebFileSystemCallbacks* callbacks,
+    const base::PlatformFileInfo& file_info) {
+  if (file_info.is_directory || file_info.size < 0) {
+    callbacks->didFail(WebKit::WebFileErrorInvalidState);
+    return;
+  }
+  callbacks->didCreateFileWriter(new WebFileWriterImpl(path, client),
+                                 file_info.size);
+}
+
+}  // namespace
+
 WebFileSystemImpl::WebFileSystemImpl() {
 }
 
 void WebFileSystemImpl::move(const WebURL& src_path,
                              const WebURL& dest_path,
                              WebFileSystemCallbacks* callbacks) {
   FileSystemDispatcher* dispatcher =
       ChildThread::current()->file_system_dispatcher();
   dispatcher->Move(GURL(src_path),
                    GURL(dest_path),
@@ skipping 86 matching lines @@
       GURL(path),
       base::Bind(&ReadDirectoryCallbackAdapater, callbacks),
       base::Bind(&FileStatusCallbackAdapter, callbacks));
 }
 
 WebKit::WebFileWriter* WebFileSystemImpl::createFileWriter(
     const WebURL& path, WebKit::WebFileWriterClient* client) {
   return new WebFileWriterImpl(GURL(path), client);
 }
 
+void WebFileSystemImpl::createFileWriter(
+    const WebURL& path,
+    WebKit::WebFileWriterClient* client,
+    WebKit::WebFileSystemCallbacks* callbacks) {
+  FileSystemDispatcher* dispatcher =
+      ChildThread::current()->file_system_dispatcher();
+  dispatcher->ReadMetadata(
+      GURL(path),
+      base::Bind(&DidReadMetadataForCreateFileWriter,
+                 GURL(path), client, callbacks),
+      base::Bind(&FileStatusCallbackAdapter, callbacks));
+}
+
 void WebFileSystemImpl::createSnapshotFileAndReadMetadata(
     const WebKit::WebURL& path,
     WebKit::WebFileSystemCallbacks* callbacks) {
   FileSystemDispatcher* dispatcher =
       ChildThread::current()->file_system_dispatcher();
   dispatcher->CreateSnapshotFile(
       GURL(path),
       base::Bind(&CreateSnapshotFileCallbackAdapter, callbacks),
       base::Bind(&FileStatusCallbackAdapter, callbacks));
 }
 
 }  // namespace content