gecko-dev/dom/file/FileHandle.cpp

179 lines
4.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FileHandle.h"
#include "nsContentUtils.h"
#include "nsDOMClassInfoID.h"
#include "nsIDOMFile.h"
#include "nsIFileStorage.h"
#include "FileRequest.h"
#include "FileService.h"
#include "LockedFile.h"
#include "MetadataHelper.h"
USING_FILE_NAMESPACE
namespace {
class GetFileHelper : public MetadataHelper
{
public:
GetFileHelper(LockedFile* aLockedFile,
FileRequest* aFileRequest,
MetadataParameters* aParams,
FileHandle* aFileHandle)
: MetadataHelper(aLockedFile, aFileRequest, aParams),
mFileHandle(aFileHandle)
{ }
nsresult
GetSuccessResult(JSContext* aCx, jsval* aVal);
void
ReleaseObjects()
{
mFileHandle = nullptr;
MetadataHelper::ReleaseObjects();
}
private:
nsRefPtr<FileHandle> mFileHandle;
};
} // anonymous namespace
NS_IMPL_CYCLE_COLLECTION_CLASS(FileHandle)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(FileHandle,
nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mFileStorage)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FileHandle,
nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mFileStorage)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(FileHandle)
NS_INTERFACE_MAP_ENTRY(nsIDOMFileHandle)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(FileHandle, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(FileHandle, nsDOMEventTargetHelper)
NS_IMPL_EVENT_HANDLER(FileHandle, abort)
NS_IMPL_EVENT_HANDLER(FileHandle, error)
NS_IMETHODIMP
FileHandle::GetName(nsAString& aName)
{
aName = mName;
return NS_OK;
}
NS_IMETHODIMP
FileHandle::GetType(nsAString& aType)
{
aType = mType;
return NS_OK;
}
NS_IMETHODIMP
FileHandle::Open(const nsAString& aMode,
uint8_t aOptionalArgCount,
nsIDOMLockedFile** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
if (FileService::IsShuttingDown() || mFileStorage->IsStorageShuttingDown()) {
return NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR;
}
LockedFile::Mode mode;
if (aOptionalArgCount) {
if (aMode.EqualsLiteral("readwrite")) {
mode = LockedFile::READ_WRITE;
}
else if (aMode.EqualsLiteral("readonly")) {
mode = LockedFile::READ_ONLY;
}
else {
return NS_ERROR_TYPE_ERR;
}
}
else {
mode = LockedFile::READ_ONLY;
}
nsRefPtr<LockedFile> lockedFile = LockedFile::Create(this, mode);
NS_ENSURE_TRUE(lockedFile, NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
lockedFile.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
FileHandle::GetFile(nsIDOMDOMRequest** _retval)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
// Do nothing if the window is closed
if (!GetOwner()) {
return NS_OK;
}
nsRefPtr<LockedFile> lockedFile =
LockedFile::Create(this, LockedFile::READ_ONLY, LockedFile::PARALLEL);
NS_ENSURE_TRUE(lockedFile, NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
nsRefPtr<FileRequest> request =
FileRequest::Create(GetOwner(), lockedFile, false);
nsRefPtr<MetadataParameters> params = new MetadataParameters();
params->Init(true, false);
nsRefPtr<GetFileHelper> helper =
new GetFileHelper(lockedFile, request, params, this);
nsresult rv = helper->Enqueue();
NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
nsCOMPtr<nsIDOMDOMRequest> result = static_cast<DOMRequest*>(request);
result.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP_(int64_t)
FileHandle::GetFileId()
{
return -1;
}
NS_IMETHODIMP_(mozilla::dom::indexedDB::FileInfo*)
FileHandle::GetFileInfo()
{
return nullptr;
}
nsresult
GetFileHelper::GetSuccessResult(JSContext* aCx, jsval* aVal)
{
nsCOMPtr<nsIDOMFile> domFile =
mFileHandle->CreateFileObject(mLockedFile, mParams->Size());
nsresult rv =
nsContentUtils::WrapNative(aCx, JS_GetGlobalForScopeChain(aCx), domFile,
&NS_GET_IID(nsIDOMFile), aVal);
NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
return NS_OK;
}