gecko-dev/dom/file/FileHandle.cpp

209 строки
5.1 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 namespace mozilla;
using namespace mozilla::dom;
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_INHERITED_1(FileHandle, nsDOMEventTargetHelper,
mFileStorage)
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::GetDOMName(nsAString& aName)
{
aName = mName;
return NS_OK;
}
NS_IMETHODIMP
FileHandle::GetDOMType(nsAString& aType)
{
aType = mType;
return NS_OK;
}
NS_IMETHODIMP
FileHandle::Open(const nsAString& aMode,
uint8_t aOptionalArgCount,
nsIDOMLockedFile** _retval)
{
FileMode mode;
if (aOptionalArgCount) {
if (aMode.EqualsLiteral("readwrite")) {
mode = FileModeValues::Readwrite;
} else if (aMode.EqualsLiteral("readonly")) {
mode = FileModeValues::Readonly;
} else {
return NS_ERROR_TYPE_ERR;
}
} else {
mode = FileModeValues::Readonly;
}
ErrorResult rv;
nsCOMPtr<nsIDOMLockedFile> lockedFile = Open(mode, rv);
lockedFile.forget(_retval);
return rv.ErrorCode();
}
already_AddRefed<nsIDOMLockedFile>
FileHandle::Open(FileMode aMode, ErrorResult& aError)
{
MOZ_ASSERT(NS_IsMainThread());
if (FileService::IsShuttingDown() || mFileStorage->IsStorageShuttingDown()) {
aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
return nullptr;
}
MOZ_STATIC_ASSERT(static_cast<uint32_t>(FileModeValues::Readonly) ==
static_cast<uint32_t>(LockedFile::READ_ONLY),
"Enum values should match.");
MOZ_STATIC_ASSERT(static_cast<uint32_t>(FileModeValues::Readwrite) ==
static_cast<uint32_t>(LockedFile::READ_WRITE),
"Enum values should match.");
nsRefPtr<LockedFile> lockedFile =
LockedFile::Create(this, static_cast<LockedFile::Mode>(aMode));
if (!lockedFile) {
aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
return nullptr;
}
return lockedFile.forget();
}
NS_IMETHODIMP
FileHandle::GetFile(nsIDOMDOMRequest** _retval)
{
ErrorResult rv;
nsCOMPtr<nsIDOMDOMRequest> request = GetFile(rv);
request.forget(_retval);
return rv.ErrorCode();
}
already_AddRefed<nsIDOMDOMRequest>
FileHandle::GetFile(ErrorResult& aError)
{
MOZ_ASSERT(NS_IsMainThread());
// Do nothing if the window is closed
if (!GetOwner()) {
return nullptr;
}
nsRefPtr<LockedFile> lockedFile =
LockedFile::Create(this, LockedFile::READ_ONLY, LockedFile::PARALLEL);
if (!lockedFile) {
aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
return nullptr;
}
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();
if (NS_FAILED(rv)) {
aError.Throw(NS_ERROR_DOM_FILEHANDLE_UNKNOWN_ERR);
return nullptr;
}
nsRefPtr<DOMRequest> domRequest = request.forget();
return domRequest.forget();
}
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;
}
/* virtual */
JSObject*
FileHandle::WrapObject(JSContext* aCx, JSObject* aScope, bool* aTriedToWrap)
{
return FileHandleBinding::Wrap(aCx, aScope, this, aTriedToWrap);
}