gecko/dom/file/ArchiveRequest.cpp
2012-08-07 10:08:41 -07:00

254 lines
6.0 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 "ArchiveRequest.h"
#include "nsContentUtils.h"
#include "nsLayoutStatics.h"
#include "nsEventDispatcher.h"
#include "nsDOMClassInfoID.h"
USING_FILE_NAMESPACE
/**
* Class used to make asynchronous the ArchiveRequest.
*/
class ArchiveRequestEvent : public nsRunnable
{
public:
NS_DECL_NSIRUNNABLE
ArchiveRequestEvent(ArchiveRequest* request)
: mRequest(request)
{
MOZ_COUNT_CTOR(ArchiveRequestEvent);
}
~ArchiveRequestEvent()
{
MOZ_COUNT_DTOR(ArchiveRequestEvent);
}
private: //data
nsRefPtr<ArchiveRequest> mRequest;
};
NS_IMETHODIMP
ArchiveRequestEvent::Run()
{
NS_ABORT_IF_FALSE(mRequest, "the request is not longer valid");
mRequest->Run();
return NS_OK;
}
/* ArchiveRequest */
ArchiveRequest::ArchiveRequest(nsIDOMWindow* aWindow,
ArchiveReader* aReader)
: DOMRequest(aWindow),
mArchiveReader(aReader)
{
nsLayoutStatics::AddRef();
/* An event to make this request asynchronous: */
nsRefPtr<ArchiveRequestEvent> event = new ArchiveRequestEvent(this);
NS_DispatchToCurrentThread(event);
}
ArchiveRequest::~ArchiveRequest()
{
nsLayoutStatics::Release();
}
nsresult
ArchiveRequest::PreHandleEvent(nsEventChainPreVisitor& aVisitor)
{
aVisitor.mCanHandle = true;
aVisitor.mParentTarget = nullptr;
return NS_OK;
}
NS_IMETHODIMP
ArchiveRequest::GetReader(nsIDOMArchiveReader** aArchiveReader)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
nsCOMPtr<nsIDOMArchiveReader> archiveReader(mArchiveReader);
archiveReader.forget(aArchiveReader);
return NS_OK;
}
// Here the request is processed:
void
ArchiveRequest::Run()
{
// Register this request to the reader.
// When the reader is ready to return data, a 'Ready()' will be called
nsresult rv = mArchiveReader->RegisterRequest(this);
if (NS_FAILED(rv))
FireError(rv);
}
void
ArchiveRequest::OpGetFilenames()
{
mOperation = GetFilenames;
}
void
ArchiveRequest::OpGetFile(const nsAString& aFilename)
{
mOperation = GetFile;
mFilename = aFilename;
}
nsresult
ArchiveRequest::ReaderReady(nsTArray<nsCOMPtr<nsIDOMFile> >& aFileList,
nsresult aStatus)
{
if (aStatus != NS_OK) {
FireError(aStatus);
return NS_OK;
}
jsval result;
nsresult rv;
nsIScriptContext* sc = GetContextForEventHandlers(&rv);
NS_ENSURE_STATE(sc);
JSContext* cx = sc->GetNativeContext();
NS_ASSERTION(cx, "Failed to get a context!");
JSObject* global = sc->GetNativeGlobal();
NS_ASSERTION(global, "Failed to get global object!");
JSAutoRequest ar(cx);
JSAutoEnterCompartment ac;
if (ac.enter(cx, global)) {
switch (mOperation) {
case GetFilenames:
rv = GetFilenamesResult(cx, &result, aFileList);
break;
case GetFile:
rv = GetFileResult(cx, &result, aFileList);
break;
}
if (NS_FAILED(rv)) {
NS_WARNING("Get*Result failed!");
}
} else {
NS_WARNING("Failed to enter correct compartment!");
rv = NS_ERROR_FAILURE;
}
if (NS_SUCCEEDED(rv)) {
FireSuccess(result);
}
else {
FireError(rv);
}
return NS_OK;
}
nsresult
ArchiveRequest::GetFilenamesResult(JSContext* aCx,
jsval* aValue,
nsTArray<nsCOMPtr<nsIDOMFile> >& aFileList)
{
JSObject* array = JS_NewArrayObject(aCx, aFileList.Length(), nullptr);
nsresult rv;
if (!array) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (PRUint32 i = 0; i < aFileList.Length(); ++i) {
nsCOMPtr<nsIDOMFile> file = aFileList[i];
nsString filename;
rv = file->GetName(filename);
NS_ENSURE_SUCCESS(rv, rv);
JSString* str = JS_NewUCStringCopyZ(aCx, filename.get());
NS_ENSURE_TRUE(str, NS_ERROR_OUT_OF_MEMORY);
jsval item = STRING_TO_JSVAL(str);
if (rv != NS_OK || !JS_SetElement(aCx, array, i, &item)) {
return NS_ERROR_FAILURE;
}
}
if (!JS_FreezeObject(aCx, array)) {
return NS_ERROR_FAILURE;
}
*aValue = OBJECT_TO_JSVAL(array);
return NS_OK;
}
nsresult
ArchiveRequest::GetFileResult(JSContext* aCx,
jsval* aValue,
nsTArray<nsCOMPtr<nsIDOMFile> >& aFileList)
{
for (PRUint32 i = 0; i < aFileList.Length(); ++i) {
nsCOMPtr<nsIDOMFile> file = aFileList[i];
nsString filename;
nsresult rv = file->GetName(filename);
NS_ENSURE_SUCCESS(rv, rv);
if (filename == mFilename) {
JSObject* scope = JS_GetGlobalForScopeChain(aCx);
nsresult rv = nsContentUtils::WrapNative(aCx, scope, file, aValue, nullptr, true);
return rv;
}
}
return NS_ERROR_FAILURE;
}
// static
already_AddRefed<ArchiveRequest>
ArchiveRequest::Create(nsIDOMWindow* aOwner,
ArchiveReader* aReader)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
nsRefPtr<ArchiveRequest> request = new ArchiveRequest(aOwner, aReader);
return request.forget();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(ArchiveRequest)
// C++ traverse
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ArchiveRequest,
DOMRequest)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR_AMBIGUOUS(mArchiveReader, nsIDOMArchiveReader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
// Unlink
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ArchiveRequest,
DOMRequest)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mArchiveReader)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(ArchiveRequest)
NS_INTERFACE_MAP_ENTRY(nsIDOMArchiveRequest)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ArchiveRequest)
NS_INTERFACE_MAP_END_INHERITING(DOMRequest)
NS_IMPL_ADDREF_INHERITED(ArchiveRequest, DOMRequest)
NS_IMPL_RELEASE_INHERITED(ArchiveRequest, DOMRequest)
DOMCI_DATA(ArchiveRequest, ArchiveRequest)