Modify DeletableFileReference to not necessarily delete after all. Renamed the class to ShareableFileReference and fixed up the current callers with the new name and gypi files.

BUG=115603
Review URL: https://chromiumcodereview.appspot.com/9466025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124276 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 77 insertions, 0 deletions

diff --git a/webkit/blob/shareable_file_reference.cc b/webkit/blob/shareable_file_reference.cc
new file mode 100644
index 0000000..b871624
--- /dev/null
+++ b/webkit/blob/shareable_file_reference.cc
@@ -0,0 +1,77 @@
+// 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 "webkit/blob/shareable_file_reference.h"
+
+#include <map>
+#include "base/file_util.h"
+#include "base/file_util_proxy.h"
+#include "base/lazy_instance.h"
+#include "base/message_loop_proxy.h"
+
+namespace webkit_blob {
+
+namespace {
+
+typedef std::map<FilePath, ShareableFileReference*> ShareableFileMap;
+base::LazyInstance<ShareableFileMap> g_file_map = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+// static
+scoped_refptr<ShareableFileReference> ShareableFileReference::Get(
+    const FilePath& path) {
+  ShareableFileMap::iterator found = g_file_map.Get().find(path);
+  ShareableFileReference* reference =
+      (found == g_file_map.Get().end()) ? NULL : found->second;
+  return scoped_refptr<ShareableFileReference>(reference);
+}
+
+// static
+scoped_refptr<ShareableFileReference> ShareableFileReference::GetOrCreate(
+    const FilePath& path, FinalReleasePolicy policy,
+    base::MessageLoopProxy* file_thread) {
+  DCHECK(file_thread);
+  typedef std::pair<ShareableFileMap::iterator, bool> InsertResult;
+
+  // Required for VS2010: http://connect.microsoft.com/VisualStudio/feedback/details/520043/error-converting-from-null-to-a-pointer-type-in-std-pair
+  webkit_blob::ShareableFileReference* null_reference = NULL;
+  InsertResult result = g_file_map.Get().insert(
+      ShareableFileMap::value_type(path, null_reference));
+  if (result.second == false)
+    return scoped_refptr<ShareableFileReference>(result.first->second);
+
+  // Wasn't in the map, create a new reference and store the pointer.
+  scoped_refptr<ShareableFileReference> reference(
+      new ShareableFileReference(path, policy, file_thread));
+  result.first->second = reference.get();
+  return reference;
+}
+
+void ShareableFileReference::AddFinalReleaseCallback(
+    const FinalReleaseCallback& callback) {
+  final_release_callbacks_.push_back(callback);
+}
+
+ShareableFileReference::ShareableFileReference(
+    const FilePath& path, FinalReleasePolicy policy,
+    base::MessageLoopProxy* file_thread)
+    : path_(path), final_release_policy_(policy), file_thread_(file_thread) {
+  DCHECK(g_file_map.Get().find(path_)->second == NULL);
+}
+
+ShareableFileReference::~ShareableFileReference() {
+  DCHECK(g_file_map.Get().find(path_)->second == this);
+  g_file_map.Get().erase(path_);
+
+  for (size_t i = 0; i < final_release_callbacks_.size(); i++)
+    final_release_callbacks_[i].Run(path_);
+
+  if (final_release_policy_ == DELETE_ON_FINAL_RELEASE) {
+    base::FileUtilProxy::Delete(file_thread_, path_, false /* recursive */,
+                                base::FileUtilProxy::StatusCallback());
+  }
+}
+
+}  // namespace webkit_blob