forked from mirrors/gecko-dev
143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozStoragePrivateHelpers_h
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#define mozStoragePrivateHelpers_h
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/**
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* This file contains convenience methods for mozStorage.
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*/
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#include "sqlite3.h"
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#include "nsIVariant.h"
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#include "nsError.h"
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#include "nsAutoPtr.h"
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#include "js/TypeDecls.h"
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#include "Variant.h"
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class mozIStorageCompletionCallback;
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class nsIRunnable;
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namespace mozilla {
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namespace storage {
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////////////////////////////////////////////////////////////////////////////////
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//// Macros
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#define ENSURE_INDEX_VALUE(aIndex, aCount) \
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NS_ENSURE_TRUE(aIndex < aCount, NS_ERROR_INVALID_ARG)
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////////////////////////////////////////////////////////////////////////////////
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//// Functions
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/**
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* Converts a SQLite return code to an nsresult return code.
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*
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* @param aSQLiteResultCode
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* The SQLite return code to convert.
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* @returns the corresponding nsresult code for aSQLiteResultCode.
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*/
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nsresult convertResultCode(int aSQLiteResultCode);
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/**
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* Checks the performance of a SQLite statement and logs a warning with
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* NS_WARNING. Currently this only checks the number of sort operations done
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* on a statement, and if more than zero have been done, the statement can be
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* made faster with the careful use of an index.
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*
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* @param aStatement
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* The sqlite3_stmt object to check.
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*/
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void checkAndLogStatementPerformance(sqlite3_stmt *aStatement);
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/**
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* Convert the provided JS::Value into a variant representation if possible.
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*
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* @param aCtx
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* The JSContext the value is from.
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* @param aValue
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* The JavaScript value to convert. All primitive types are supported,
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* but only Date objects are supported from the Date family. Date
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* objects are coerced to PRTime (nanoseconds since epoch) values.
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* @return the variant if conversion was successful, nullptr if conversion
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* failed. The caller is responsible for addref'ing if non-null.
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*/
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nsIVariant *convertJSValToVariant(JSContext *aCtx, const JS::Value& aValue);
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/**
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* Convert a provided nsIVariant implementation to our own thread-safe
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* refcounting implementation, if needed.
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*
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* @param aValue
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* The original nsIVariant to be converted.
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* @return a thread-safe refcounting nsIVariant implementation.
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*/
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Variant_base *convertVariantToStorageVariant(nsIVariant *aVariant);
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/**
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* Obtains an event that will notify a completion callback about completion.
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*
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* @param aCallback
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* The callback to be notified.
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* @return an nsIRunnable that can be dispatched to the calling thread.
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*/
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already_AddRefed<nsIRunnable> newCompletionEvent(
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mozIStorageCompletionCallback *aCallback
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);
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/**
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* Utility method to get a Blob as a string value. The string expects
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* the interface exposed by nsAString/nsACString/etc.
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*/
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template<class T, class V>
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nsresult
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DoGetBlobAsString(T* aThis, uint32_t aIndex, V& aValue)
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{
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typedef typename V::char_type char_type;
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uint32_t size;
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char_type* blob;
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nsresult rv =
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aThis->GetBlob(aIndex, &size, reinterpret_cast<uint8_t**>(&blob));
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NS_ENSURE_SUCCESS(rv, rv);
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aValue.Assign(blob, size / sizeof(char_type));
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delete[] blob;
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return NS_OK;
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}
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/**
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* Utility method to bind a string value as a Blob. The string expects
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* the interface exposed by nsAString/nsACString/etc.
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*/
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template<class T, class V>
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nsresult
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DoBindStringAsBlobByName(T* aThis, const nsACString& aName, const V& aValue)
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{
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typedef typename V::char_type char_type;
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return aThis->BindBlobByName(aName,
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reinterpret_cast<const uint8_t*>(aValue.BeginReading()),
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aValue.Length() * sizeof(char_type));
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}
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/**
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* Utility method to bind a string value as a Blob. The string expects
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* the interface exposed by nsAString/nsACString/etc.
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*/
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template<class T, class V>
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nsresult
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DoBindStringAsBlobByIndex(T* aThis, uint32_t aIndex, const V& aValue)
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{
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typedef typename V::char_type char_type;
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return aThis->BindBlobByIndex(aIndex,
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reinterpret_cast<const uint8_t*>(aValue.BeginReading()),
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aValue.Length() * sizeof(char_type));
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}
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} // namespace storage
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} // namespace mozilla
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#endif // mozStoragePrivateHelpers_h
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