mozStorageAsyncStatementJSHelper.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :

 * 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 "nsIXPConnect.h"

#include "mozStorageAsyncStatement.h"

#include "mozStorageService.h"

#include "nsString.h"

#include "nsServiceManagerUtils.h"

#include "mozStorageAsyncStatementJSHelper.h"

#include "mozStorageAsyncStatementParams.h"

#include "jsapi.h"

#include "js/PropertyAndElement.h"  // JS_DefineProperty, JS_DefinePropertyById

#include "xpc_make_class.h"

namespace mozilla {

namespace storage {

////////////////////////////////////////////////////////////////////////////////

//// AsyncStatementJSHelper

nsresult AsyncStatementJSHelper::getParams(AsyncStatement* aStatement,

                                           JSContext* aCtx, JSObject* aScopeObj,

                                           JS::Value* _params) {

  MOZ_ASSERT(NS_IsMainThread());

#ifdef DEBUG

  int32_t state;

  (void)aStatement->GetState(&state);

  NS_ASSERTION(state == mozIStorageAsyncStatement::MOZ_STORAGE_STATEMENT_READY,

               "Invalid state to get the params object - all calls will fail!");

#endif

  JS::Rooted<JSObject*> scope(aCtx, aScopeObj);

  if (!aStatement->mStatementParamsHolder) {

    dom::GlobalObject global(aCtx, scope);

    if (global.Failed()) {

      return NS_ERROR_UNEXPECTED;

    nsCOMPtr<nsPIDOMWindowInner> window =

        do_QueryInterface(global.GetAsSupports());

    RefPtr<AsyncStatementParams> params(

        new AsyncStatementParams(window, aStatement));

    NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);

    RefPtr<AsyncStatementParamsHolder> paramsHolder =

        new AsyncStatementParamsHolder(params);

    NS_ENSURE_TRUE(paramsHolder, NS_ERROR_OUT_OF_MEMORY);

    aStatement->mStatementParamsHolder =

        new nsMainThreadPtrHolder<AsyncStatementParamsHolder>(

            "Statement::mStatementParamsHolder", paramsHolder);

  RefPtr<AsyncStatementParams> params(

      aStatement->mStatementParamsHolder->Get());

  JSObject* obj = params->WrapObject(aCtx, nullptr);

  if (!obj) {

    return NS_ERROR_UNEXPECTED;

  _params->setObject(*obj);

  return NS_OK;

NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::AddRef() {

  return 2;

NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::Release() {

  return 1;

NS_INTERFACE_MAP_BEGIN(AsyncStatementJSHelper)

  NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

////////////////////////////////////////////////////////////////////////////////

//// nsIXPCScriptable

#define XPC_MAP_CLASSNAME AsyncStatementJSHelper

#define XPC_MAP_QUOTED_CLASSNAME "AsyncStatementJSHelper"

#define XPC_MAP_FLAGS \

  (XPC_SCRIPTABLE_WANT_RESOLVE | XPC_SCRIPTABLE_ALLOW_PROP_MODS_DURING_RESOLVE)

#include "xpc_map_end.h"

NS_IMETHODIMP

AsyncStatementJSHelper::Resolve(nsIXPConnectWrappedNative* aWrapper,

                                JSContext* aCtx, JSObject* aScopeObj, jsid aId,

                                bool* resolvedp, bool* _retval) {

  if (!aId.isString()) return NS_OK;

  // Cast to async via mozI* since direct from nsISupports is ambiguous.

  JS::Rooted<JSObject*> scope(aCtx, aScopeObj);

  JS::Rooted<JS::PropertyKey> id(aCtx, aId);

  mozIStorageAsyncStatement* iAsyncStmt =

      static_cast<mozIStorageAsyncStatement*>(aWrapper->Native());

  AsyncStatement* stmt = static_cast<AsyncStatement*>(iAsyncStmt);

#ifdef DEBUG

    nsISupports* supp = aWrapper->Native();

    nsCOMPtr<mozIStorageAsyncStatement> isStatement(do_QueryInterface(supp));

    NS_ASSERTION(isStatement, "How is this not an async statement?!");

#endif

  if (::JS_LinearStringEqualsLiteral(id.toLinearString(), "params")) {

    JS::Rooted<JS::Value> val(aCtx);

    nsresult rv = getParams(stmt, aCtx, scope, val.address());

    NS_ENSURE_SUCCESS(rv, rv);

    *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);

    *resolvedp = true;

    return NS_OK;

  return NS_OK;

////////////////////////////////////////////////////////////////////////////////

//// AsyncStatementParamsHolder

NS_IMPL_ISUPPORTS0(AsyncStatementParamsHolder);

AsyncStatementParamsHolder::~AsyncStatementParamsHolder() {

  MOZ_ASSERT(NS_IsMainThread());

  // We are considered dead at this point, so any wrappers for row or params

  // need to lose their reference to the statement.

  mParams->mStatement = nullptr;

}  // namespace storage

}  // namespace mozilla