storage/mozStorageStatementRow.cpp
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 253620 78740e4f499862f76bb0f8045d5398e8dcaf5aa2
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- 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 "nsMemory.h"
#include "nsString.h"

#include "mozStorageStatementRow.h"
#include "mozStorageStatement.h"

#include "jsapi.h"

namespace mozilla {
namespace storage {

////////////////////////////////////////////////////////////////////////////////
//// StatementRow

StatementRow::StatementRow(Statement *aStatement)
: mStatement(aStatement)
{
}

NS_IMPL_ISUPPORTS(
  StatementRow,
  mozIStorageStatementRow,
  nsIXPCScriptable
)

////////////////////////////////////////////////////////////////////////////////
//// nsIXPCScriptable

#define XPC_MAP_CLASSNAME StatementRow
#define XPC_MAP_QUOTED_CLASSNAME "StatementRow"
#define XPC_MAP_WANT_GETPROPERTY
#define XPC_MAP_WANT_RESOLVE
#define XPC_MAP_FLAGS nsIXPCScriptable::ALLOW_PROP_MODS_DURING_RESOLVE
#include "xpc_map_end.h"

NS_IMETHODIMP
StatementRow::GetProperty(nsIXPConnectWrappedNative *aWrapper,
                          JSContext *aCtx,
                          JSObject *aScopeObj,
                          jsid aId,
                          JS::Value *_vp,
                          bool *_retval)
{
  NS_ENSURE_TRUE(mStatement, NS_ERROR_NOT_INITIALIZED);

  JS::RootedObject scope(aCtx, aScopeObj);
  if (JSID_IS_STRING(aId)) {
    ::JSAutoByteString idBytes(aCtx, JSID_TO_STRING(aId));
    NS_ENSURE_TRUE(!!idBytes, NS_ERROR_OUT_OF_MEMORY);
    nsDependentCString jsid(idBytes.ptr());

    uint32_t idx;
    nsresult rv = mStatement->GetColumnIndex(jsid, &idx);
    NS_ENSURE_SUCCESS(rv, rv);
    int32_t type;
    rv = mStatement->GetTypeOfIndex(idx, &type);
    NS_ENSURE_SUCCESS(rv, rv);

    if (type == mozIStorageValueArray::VALUE_TYPE_INTEGER ||
        type == mozIStorageValueArray::VALUE_TYPE_FLOAT) {
      double dval;
      rv = mStatement->GetDouble(idx, &dval);
      NS_ENSURE_SUCCESS(rv, rv);
      *_vp = ::JS_NumberValue(dval);
    }
    else if (type == mozIStorageValueArray::VALUE_TYPE_TEXT) {
      uint32_t bytes;
      const char16_t *sval = reinterpret_cast<const char16_t *>(
        static_cast<mozIStorageStatement *>(mStatement)->
          AsSharedWString(idx, &bytes)
      );
      JSString *str = ::JS_NewUCStringCopyN(aCtx, sval, bytes / 2);
      if (!str) {
        *_retval = false;
        return NS_OK;
      }
      _vp->setString(str);
    }
    else if (type == mozIStorageValueArray::VALUE_TYPE_BLOB) {
      uint32_t length;
      const uint8_t *blob = static_cast<mozIStorageStatement *>(mStatement)->
        AsSharedBlob(idx, &length);
      JSObject *obj = ::JS_NewArrayObject(aCtx, length);
      if (!obj) {
        *_retval = false;
        return NS_OK;
      }
      _vp->setObject(*obj);

      // Copy the blob over to the JS array.
      for (uint32_t i = 0; i < length; i++) {
        if (!::JS_DefineElement(aCtx, scope, i, blob[i], JSPROP_ENUMERATE)) {
          *_retval = false;
          return NS_OK;
        }
      }
    }
    else if (type == mozIStorageValueArray::VALUE_TYPE_NULL) {
      _vp->setNull();
    }
    else {
      NS_ERROR("unknown column type returned, what's going on?");
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
StatementRow::Resolve(nsIXPConnectWrappedNative *aWrapper,
                      JSContext *aCtx,
                      JSObject *aScopeObj,
                      jsid aId,
                      bool *aResolvedp,
                      bool *_retval)
{
  JS::Rooted<JSObject*> scopeObj(aCtx, aScopeObj);

  NS_ENSURE_TRUE(mStatement, NS_ERROR_NOT_INITIALIZED);
  // We do not throw at any point after this because we want to allow the
  // prototype chain to be checked for the property.

  if (JSID_IS_STRING(aId)) {
    ::JSAutoByteString idBytes(aCtx, JSID_TO_STRING(aId));
    NS_ENSURE_TRUE(!!idBytes, NS_ERROR_OUT_OF_MEMORY);
    nsDependentCString name(idBytes.ptr());

    uint32_t idx;
    nsresult rv = mStatement->GetColumnIndex(name, &idx);
    if (NS_FAILED(rv)) {
      // It's highly likely that the name doesn't exist, so let the JS engine
      // check the prototype chain and throw if that doesn't have the property
      // either.
      *aResolvedp = false;
      return NS_OK;
    }

    JS::Rooted<jsid> id(aCtx, aId);
    *_retval = ::JS_DefinePropertyById(aCtx, scopeObj, id, JS::UndefinedHandleValue,
                                       JSPROP_RESOLVING);
    *aResolvedp = true;
    return NS_OK;
  }

  return NS_OK;
}

} // namespace storage
} // namespace mozilla