storage/mozStorageAsyncStatementJSHelper.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsIXPConnect.h"
   8 #include "mozStorageAsyncStatement.h"
   9 #include "mozStorageService.h"
  10
  11 #include "nsMemory.h"
  12 #include "nsString.h"
  13 #include "nsServiceManagerUtils.h"
  14
  15 #include "mozStorageAsyncStatementJSHelper.h"
  16
  17 #include "mozStorageAsyncStatementParams.h"
  18
  19 #include "jsapi.h"
  20 #include "js/PropertyAndElement.h"  // JS_DefineProperty, JS_DefinePropertyById
  21
  22 #include "xpc_make_class.h"
  23
  24 namespace mozilla {
  25 namespace storage {
  26
  27 ////////////////////////////////////////////////////////////////////////////////
  28 //// AsyncStatementJSHelper
  29
  30 nsresult AsyncStatementJSHelper::getParams(AsyncStatement* aStatement,
  31                                            JSContext* aCtx, JSObject* aScopeObj,
  32                                            JS::Value* _params) {
  33   MOZ_ASSERT(NS_IsMainThread());
  34
  35 #ifdef DEBUG
  36   int32_t state;
  37   (void)aStatement->GetState(&state);
  38   NS_ASSERTION(state == mozIStorageAsyncStatement::MOZ_STORAGE_STATEMENT_READY,
  39                "Invalid state to get the params object - all calls will fail!");
  40 #endif
  41
  42   JS::RootedObject scope(aCtx, aScopeObj);
  43
  44   if (!aStatement->mStatementParamsHolder) {
  45     dom::GlobalObject global(aCtx, scope);
  46     if (global.Failed()) {
  47       return NS_ERROR_UNEXPECTED;
  48     }
  49
  50     nsCOMPtr<nsPIDOMWindowInner> window =
  51         do_QueryInterface(global.GetAsSupports());
  52
  53     RefPtr<AsyncStatementParams> params(
  54         new AsyncStatementParams(window, aStatement));
  55     NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);
  56
  57     RefPtr<AsyncStatementParamsHolder> paramsHolder =
  58         new AsyncStatementParamsHolder(params);
  59     NS_ENSURE_TRUE(paramsHolder, NS_ERROR_OUT_OF_MEMORY);
  60
  61     aStatement->mStatementParamsHolder =
  62         new nsMainThreadPtrHolder<AsyncStatementParamsHolder>(
  63             "Statement::mStatementParamsHolder", paramsHolder);
  64   }
  65
  66   RefPtr<AsyncStatementParams> params(
  67       aStatement->mStatementParamsHolder->Get());
  68   JSObject* obj = params->WrapObject(aCtx, nullptr);
  69   if (!obj) {
  70     return NS_ERROR_UNEXPECTED;
  71   }
  72
  73   _params->setObject(*obj);
  74   return NS_OK;
  75 }
  76
  77 NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::AddRef() {
  78   return 2;
  79 }
  80 NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::Release() {
  81   return 1;
  82 }
  83 NS_INTERFACE_MAP_BEGIN(AsyncStatementJSHelper)
  84   NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
  85   NS_INTERFACE_MAP_ENTRY(nsISupports)
  86 NS_INTERFACE_MAP_END
  87
  88 ////////////////////////////////////////////////////////////////////////////////
  89 //// nsIXPCScriptable
  90
  91 #define XPC_MAP_CLASSNAME AsyncStatementJSHelper
  92 #define XPC_MAP_QUOTED_CLASSNAME "AsyncStatementJSHelper"
  93 #define XPC_MAP_FLAGS \
  94   (XPC_SCRIPTABLE_WANT_RESOLVE | XPC_SCRIPTABLE_ALLOW_PROP_MODS_DURING_RESOLVE)
  95 #include "xpc_map_end.h"
  96
  97 NS_IMETHODIMP
  98 AsyncStatementJSHelper::Resolve(nsIXPConnectWrappedNative* aWrapper,
  99                                 JSContext* aCtx, JSObject* aScopeObj, jsid aId,
 100                                 bool* resolvedp, bool* _retval) {
 101   if (!JSID_IS_STRING(aId)) return NS_OK;
 102
 103   // Cast to async via mozI* since direct from nsISupports is ambiguous.
 104   JS::RootedObject scope(aCtx, aScopeObj);
 105   JS::RootedId id(aCtx, aId);
 106   mozIStorageAsyncStatement* iAsyncStmt =
 107       static_cast<mozIStorageAsyncStatement*>(aWrapper->Native());
 108   AsyncStatement* stmt = static_cast<AsyncStatement*>(iAsyncStmt);
 109
 110 #ifdef DEBUG
 111   {
 112     nsISupports* supp = aWrapper->Native();
 113     nsCOMPtr<mozIStorageAsyncStatement> isStatement(do_QueryInterface(supp));
 114     NS_ASSERTION(isStatement, "How is this not an async statement?!");
 115   }
 116 #endif
 117
 118   if (::JS_LinearStringEqualsLiteral(JSID_TO_LINEAR_STRING(id), "params")) {
 119     JS::RootedValue val(aCtx);
 120     nsresult rv = getParams(stmt, aCtx, scope, val.address());
 121     NS_ENSURE_SUCCESS(rv, rv);
 122     *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);
 123     *resolvedp = true;
 124     return NS_OK;
 125   }
 126
 127   return NS_OK;
 128 }
 129
 130 ////////////////////////////////////////////////////////////////////////////////
 131 //// AsyncStatementParamsHolder
 132
 133 NS_IMPL_ISUPPORTS0(AsyncStatementParamsHolder);
 134
 135 AsyncStatementParamsHolder::~AsyncStatementParamsHolder() {
 136   MOZ_ASSERT(NS_IsMainThread());
 137   // We are considered dead at this point, so any wrappers for row or params
 138   // need to lose their reference to the statement.
 139   mParams->mStatement = nullptr;
 140 }
 141
 142 }  // namespace storage
 143 }  // namespace mozilla