(For-try) Divide recursive Copy/Move into multiple async tasks

webkit/fileapi/remove_operation_delegate.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 "webkit/fileapi/remove_operation_delegate.h"
+
+#include "base/bind.h"
+#include "webkit/fileapi/file_system_context.h"
+#include "webkit/fileapi/file_system_operation_context.h"
+#include "webkit/fileapi/local_file_system_operation.h"
+
+namespace fileapi {
+
+RemoveOperationDelegate::RemoveOperationDelegate(
+    LocalFileSystemOperation* original_operation,
+    const FileSystemURL& url,
+    const StatusCallback& callback)
+    : RecursiveOperationDelegate(original_operation),
+      url_(url),
+      callback_(callback) {
+}
+
+RemoveOperationDelegate::~RemoveOperationDelegate() {}
+
+void RemoveOperationDelegate::Run() {
+  base::PlatformFileError error;
+  LocalFileSystemOperation* operation = NewOperation(url_, &error);
+  if (!operation) {
+    callback_.Run(error);
+    return;
+  }
+  operation->RemoveFile(url_, base::Bind(
+      &RemoveOperationDelegate::DidTryRemoveFile, AsWeakPtr()));
+}
+
+void RemoveOperationDelegate::RunRecursively() {
+  StartRecursiveOperation(
+      url_,
+      base::Bind(&RemoveOperationDelegate::RemoveNextDirectory, AsWeakPtr()));
+}
+
+void RemoveOperationDelegate::ProcessFile(const FileSystemURL& url,
+                                          const StatusCallback& callback) {
+  base::PlatformFileError error;
+  LocalFileSystemOperation* operation = NewOperation(url, &error);
+  if (!operation) {
+    callback.Run(error);
+    return;
+  }
+  if (to_remove_directories_.size() == 1u &&
+      to_remove_directories_.top() == url) {
+    // We seem to have been re-directed from ProcessDirectory.
+    to_remove_directories_.pop();
+  }
+  operation->RemoveFile(url, base::Bind(
+      &RemoveOperationDelegate::DidRemoveFile, AsWeakPtr(), callback));
+}
+
+void RemoveOperationDelegate::ProcessDirectory(const FileSystemURL& url,
+                                               const StatusCallback& callback) {
+  to_remove_directories_.push(url);
+  callback.Run(base::PLATFORM_FILE_OK);
+}
+
+void RemoveOperationDelegate::DidTryRemoveFile(
+    base::PlatformFileError error) {
+  if (error == base::PLATFORM_FILE_OK ||
+      error != base::PLATFORM_FILE_ERROR_NOT_A_FILE) {
+    callback_.Run(error);
+    return;
+  }
+  LocalFileSystemOperation* operation = NewOperation(url_, &error);
+  if (!operation) {
+    callback_.Run(error);
+    return;
+  }
+  operation->RemoveDirectory(url_, callback_);
+}
+
+void RemoveOperationDelegate::DidRemoveFile(const StatusCallback& callback,
+                                            base::PlatformFileError error) {
+  if (error == base::PLATFORM_FILE_ERROR_NOT_FOUND) {
+    callback.Run(base::PLATFORM_FILE_OK);
+    return;
+  }
+  callback.Run(error);
+}
+
+void RemoveOperationDelegate::RemoveNextDirectory(
+    base::PlatformFileError error) {
+  if (error != base::PLATFORM_FILE_OK ||
+      to_remove_directories_.empty()) {
+    callback_.Run(error);
+    return;
+  }
+  FileSystemURL url = to_remove_directories_.top();
+  to_remove_directories_.pop();
+  LocalFileSystemOperation* operation = NewOperation(url, &error);
+  if (!operation) {
+    callback_.Run(error);
+    return;
+  }
+  operation->RemoveDirectory(url, base::Bind(
+      &RemoveOperationDelegate::RemoveNextDirectory,
+      AsWeakPtr()));
+}
+
+}  // namespace fileapi