gecko/storage/src/mozStorageAsyncStatementJSHelper.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozStorage code.
 *
 * The Initial Developer of the Original Code is the Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Shawn Wilsher <me@shawnwilsher.com> (Original Author)
 *   Andrew Sutherland <asutherland@asutherland.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIXPConnect.h"
#include "mozStorageAsyncStatement.h"
#include "mozStorageService.h"

#include "nsMemory.h"
#include "nsString.h"
#include "nsServiceManagerUtils.h"

#include "mozStorageAsyncStatementJSHelper.h"

#include "mozStorageAsyncStatementParams.h"

#include "jsapi.h"

namespace mozilla {
namespace storage {

////////////////////////////////////////////////////////////////////////////////
//// AsyncStatementJSHelper

nsresult
AsyncStatementJSHelper::getParams(AsyncStatement *aStatement,
                                  JSContext *aCtx,
                                  JSObject *aScopeObj,
                                  jsval *_params)
{
  nsresult rv;

#ifdef DEBUG
  PRInt32 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

  if (!aStatement->mStatementParamsHolder) {
    nsCOMPtr<mozIStorageStatementParams> params =
      new AsyncStatementParams(aStatement);
    NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);

    nsCOMPtr<nsIXPConnect> xpc(Service::getXPConnect());
    rv = xpc->WrapNative(
      aCtx,
      ::JS_GetGlobalForObject(aCtx, aScopeObj),
      params,
      NS_GET_IID(mozIStorageStatementParams),
      getter_AddRefs(aStatement->mStatementParamsHolder)
    );
    NS_ENSURE_SUCCESS(rv, rv);
  }

  JSObject *obj = nsnull;
  rv = aStatement->mStatementParamsHolder->GetJSObject(&obj);
  NS_ENSURE_SUCCESS(rv, rv);

  *_params = OBJECT_TO_JSVAL(obj);
  return NS_OK;
}

NS_IMETHODIMP_(nsrefcnt) AsyncStatementJSHelper::AddRef() { return 2; }
NS_IMETHODIMP_(nsrefcnt) 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_WANT_GETPROPERTY
#define XPC_MAP_FLAGS nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h"

NS_IMETHODIMP
AsyncStatementJSHelper::GetProperty(nsIXPConnectWrappedNative *aWrapper,
                                    JSContext *aCtx,
                                    JSObject *aScopeObj,
                                    jsid aId,
                                    jsval *_result,
                                    bool *_retval)
{
  if (!JSID_IS_STRING(aId))
    return NS_OK;

  // Cast to async via mozI* since direct from nsISupports is ambiguous.
  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_FlatStringEqualsAscii(JSID_TO_FLAT_STRING(aId), "params"))
    return getParams(stmt, aCtx, aScopeObj, _result);

  return NS_OK;
}

} // namespace storage
} // namespace mozilla