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// Copyright (c) 2010 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/deletable_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, DeletableFileReference*> DeleteableFileMap;
static base::LazyInstance<DeleteableFileMap> g_deletable_file_map(
base::LINKER_INITIALIZED);
} // namespace
// static
scoped_refptr<DeletableFileReference> DeletableFileReference::Get(
const FilePath& path) {
DeleteableFileMap::iterator found = g_deletable_file_map.Get().find(path);
DeletableFileReference* reference =
(found == g_deletable_file_map.Get().end()) ? NULL : found->second;
return scoped_refptr<DeletableFileReference>(reference);
}
// static
scoped_refptr<DeletableFileReference> DeletableFileReference::GetOrCreate(
const FilePath& path, base::MessageLoopProxy* file_thread) {
DCHECK(file_thread);
typedef std::pair<DeleteableFileMap::iterator, bool> InsertResult;
// Visual Studio 2010 has problems converting NULL to the null pointer for
// std::pair. See http://connect.microsoft.com/VisualStudio/feedback/details/520043/error-converting-from-null-to-a-pointer-type-in-std-pair
// It will work if we pass nullptr.
#if defined(_MSC_VER) && _MSC_VER >= 1600
webkit_blob::DeletableFileReference* null_reference = nullptr;
#else
webkit_blob::DeletableFileReference* null_reference = NULL;
#endif
InsertResult result = g_deletable_file_map.Get().insert(
DeleteableFileMap::value_type(path, null_reference));
if (result.second == false)
return scoped_refptr<DeletableFileReference>(result.first->second);
// Wasn't in the map, create a new reference and store the pointer.
scoped_refptr<DeletableFileReference> reference(
new DeletableFileReference(path, file_thread));
result.first->second = reference.get();
return reference;
}
DeletableFileReference::DeletableFileReference(
const FilePath& path, base::MessageLoopProxy* file_thread)
: path_(path), file_thread_(file_thread) {
DCHECK(g_deletable_file_map.Get().find(path_)->second == NULL);
}
DeletableFileReference::~DeletableFileReference() {
DCHECK(g_deletable_file_map.Get().find(path_)->second == this);
g_deletable_file_map.Get().erase(path_);
base::FileUtilProxy::Delete(file_thread_, path_, false /* recursive */, NULL);
}
} // namespace webkit_blob
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