449 lines
11 KiB
C++
449 lines
11 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 mozilla_storage_Variant_h__
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#define mozilla_storage_Variant_h__
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#include <utility>
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#include "nsIVariant.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#define VARIANT_BASE_IID \
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{ /* 78888042-0fa3-4f7a-8b19-7996f99bf1aa */ \
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0x78888042, 0x0fa3, 0x4f7a, \
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{ 0x8b, 0x19, 0x79, 0x96, 0xf9, 0x9b, 0xf1, 0xaa } \
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}
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/**
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* This class is used by the storage module whenever an nsIVariant needs to be
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* returned. We provide traits for the basic sqlite types to make use easier.
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* The following types map to the indicated sqlite type:
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* int64_t -> INTEGER (use IntegerVariant)
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* double -> FLOAT (use FloatVariant)
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* nsString -> TEXT (use TextVariant)
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* nsCString -> TEXT (use UTF8TextVariant)
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* uint8_t[] -> BLOB (use BlobVariant)
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* nullptr -> NULL (use NullVariant)
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*/
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namespace mozilla {
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namespace storage {
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////////////////////////////////////////////////////////////////////////////////
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//// Base Class
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class Variant_base : public nsIVariant
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIVARIANT
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NS_DECLARE_STATIC_IID_ACCESSOR(VARIANT_BASE_IID)
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protected:
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virtual ~Variant_base() { }
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(Variant_base,
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VARIANT_BASE_IID)
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////////////////////////////////////////////////////////////////////////////////
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//// Traits
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/**
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* Generics
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*/
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template <typename DataType>
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struct variant_traits
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_EMPTY; }
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};
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template <typename DataType, bool Adopting=false>
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struct variant_storage_traits
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{
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typedef DataType ConstructorType;
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typedef DataType StorageType;
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static inline void storage_conversion(const ConstructorType aData, StorageType* _storage)
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{
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*_storage = aData;
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}
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static inline void destroy(const StorageType& _storage)
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{ }
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};
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#define NO_CONVERSION return NS_ERROR_CANNOT_CONVERT_DATA;
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template <typename DataType, bool Adopting=false>
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struct variant_integer_traits
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{
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typedef typename variant_storage_traits<DataType, Adopting>::StorageType StorageType;
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static inline nsresult asInt32(const StorageType &, int32_t *) { NO_CONVERSION }
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static inline nsresult asInt64(const StorageType &, int64_t *) { NO_CONVERSION }
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};
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template <typename DataType, bool Adopting=false>
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struct variant_float_traits
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{
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typedef typename variant_storage_traits<DataType, Adopting>::StorageType StorageType;
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static inline nsresult asDouble(const StorageType &, double *) { NO_CONVERSION }
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};
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template <typename DataType, bool Adopting=false>
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struct variant_text_traits
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{
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typedef typename variant_storage_traits<DataType, Adopting>::StorageType StorageType;
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static inline nsresult asUTF8String(const StorageType &, nsACString &) { NO_CONVERSION }
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static inline nsresult asString(const StorageType &, nsAString &) { NO_CONVERSION }
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};
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template <typename DataType, bool Adopting=false>
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struct variant_blob_traits
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{
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typedef typename variant_storage_traits<DataType, Adopting>::StorageType StorageType;
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static inline nsresult asArray(const StorageType &, uint16_t *, uint32_t *, void **)
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{ NO_CONVERSION }
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};
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#undef NO_CONVERSION
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/**
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* INTEGER types
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*/
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template < >
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struct variant_traits<int64_t>
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_INT64; }
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};
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template < >
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struct variant_integer_traits<int64_t>
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{
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static inline nsresult asInt32(int64_t aValue,
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int32_t *_result)
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{
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if (aValue > INT32_MAX || aValue < INT32_MIN)
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return NS_ERROR_CANNOT_CONVERT_DATA;
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*_result = static_cast<int32_t>(aValue);
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return NS_OK;
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}
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static inline nsresult asInt64(int64_t aValue,
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int64_t *_result)
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{
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*_result = aValue;
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return NS_OK;
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}
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};
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// xpcvariant just calls get double for integers...
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template < >
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struct variant_float_traits<int64_t>
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{
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static inline nsresult asDouble(int64_t aValue,
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double *_result)
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{
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*_result = double(aValue);
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return NS_OK;
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}
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};
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/**
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* FLOAT types
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*/
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template < >
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struct variant_traits<double>
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_DOUBLE; }
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};
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template < >
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struct variant_float_traits<double>
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{
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static inline nsresult asDouble(double aValue,
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double *_result)
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{
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*_result = aValue;
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return NS_OK;
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}
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};
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/**
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* TEXT types
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*/
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template < >
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struct variant_traits<nsString>
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_ASTRING; }
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};
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template < >
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struct variant_storage_traits<nsString>
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{
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typedef const nsAString & ConstructorType;
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typedef nsString StorageType;
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static inline void storage_conversion(ConstructorType aText, StorageType* _outData)
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{
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*_outData = aText;
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}
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static inline void destroy(const StorageType& _outData)
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{ }
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};
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template < >
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struct variant_text_traits<nsString>
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{
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static inline nsresult asUTF8String(const nsString &aValue,
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nsACString &_result)
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{
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CopyUTF16toUTF8(aValue, _result);
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return NS_OK;
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}
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static inline nsresult asString(const nsString &aValue,
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nsAString &_result)
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{
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_result = aValue;
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return NS_OK;
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}
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};
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template < >
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struct variant_traits<nsCString>
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_UTF8STRING; }
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};
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template < >
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struct variant_storage_traits<nsCString>
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{
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typedef const nsACString & ConstructorType;
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typedef nsCString StorageType;
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static inline void storage_conversion(ConstructorType aText, StorageType* _outData)
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{
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*_outData = aText;
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}
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static inline void destroy(const StorageType &aData)
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{ }
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};
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template < >
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struct variant_text_traits<nsCString>
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{
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static inline nsresult asUTF8String(const nsCString &aValue,
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nsACString &_result)
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{
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_result = aValue;
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return NS_OK;
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}
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static inline nsresult asString(const nsCString &aValue,
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nsAString &_result)
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{
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CopyUTF8toUTF16(aValue, _result);
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return NS_OK;
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}
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};
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/**
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* BLOB types
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*/
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template < >
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struct variant_traits<uint8_t[]>
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{
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static inline uint16_t type() { return nsIDataType::VTYPE_ARRAY; }
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};
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template < >
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struct variant_storage_traits<uint8_t[], false>
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{
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typedef std::pair<const void *, int> ConstructorType;
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typedef FallibleTArray<uint8_t> StorageType;
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static inline void storage_conversion(ConstructorType aBlob, StorageType* _outData)
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{
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_outData->Clear();
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(void)_outData->AppendElements(static_cast<const uint8_t *>(aBlob.first),
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aBlob.second, fallible);
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}
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static inline void destroy(const StorageType& _outData)
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{ }
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};
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template < >
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struct variant_storage_traits<uint8_t[], true>
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{
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typedef std::pair<uint8_t *, int> ConstructorType;
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typedef std::pair<uint8_t *, int> StorageType;
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static inline void storage_conversion(ConstructorType aBlob, StorageType* _outData)
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{
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*_outData = aBlob;
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}
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static inline void destroy(StorageType &aData)
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{
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if (aData.first) {
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free(aData.first);
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aData.first = nullptr;
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}
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}
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};
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template < >
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struct variant_blob_traits<uint8_t[], false>
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{
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static inline nsresult asArray(FallibleTArray<uint8_t> &aData,
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uint16_t *_type,
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uint32_t *_size,
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void **_result)
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{
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// For empty blobs, we return nullptr.
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if (aData.Length() == 0) {
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*_result = nullptr;
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*_type = nsIDataType::VTYPE_UINT8;
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*_size = 0;
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return NS_OK;
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}
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// Otherwise, we copy the array.
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*_result = nsMemory::Clone(aData.Elements(), aData.Length() * sizeof(uint8_t));
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NS_ENSURE_TRUE(*_result, NS_ERROR_OUT_OF_MEMORY);
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// Set type and size
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*_type = nsIDataType::VTYPE_UINT8;
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*_size = aData.Length();
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return NS_OK;
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}
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};
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template < >
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struct variant_blob_traits<uint8_t[], true>
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{
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static inline nsresult asArray(std::pair<uint8_t *, int> &aData,
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uint16_t *_type,
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uint32_t *_size,
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void **_result)
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{
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// For empty blobs, we return nullptr.
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if (aData.second == 0) {
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*_result = nullptr;
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*_type = nsIDataType::VTYPE_UINT8;
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*_size = 0;
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return NS_OK;
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}
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// Otherwise, transfer the data out.
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*_result = aData.first;
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aData.first = nullptr;
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MOZ_ASSERT(*_result); // We asked for it twice, better not use adopting!
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// Set type and size
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*_type = nsIDataType::VTYPE_UINT8;
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*_size = aData.second;
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return NS_OK;
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}
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};
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/**
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* nullptr type
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*/
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class NullVariant : public Variant_base
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{
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public:
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NS_IMETHOD GetDataType(uint16_t *_type)
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{
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NS_ENSURE_ARG_POINTER(_type);
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*_type = nsIDataType::VTYPE_EMPTY;
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return NS_OK;
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}
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NS_IMETHOD GetAsAUTF8String(nsACString &_str)
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{
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// Return a void string.
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_str.Truncate(0);
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_str.SetIsVoid(true);
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return NS_OK;
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}
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NS_IMETHOD GetAsAString(nsAString &_str)
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{
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// Return a void string.
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_str.Truncate(0);
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_str.SetIsVoid(true);
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return NS_OK;
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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//// Template Implementation
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template <typename DataType, bool Adopting=false>
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class Variant final : public Variant_base
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{
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~Variant()
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{
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variant_storage_traits<DataType, Adopting>::destroy(mData);
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}
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public:
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explicit Variant(const typename variant_storage_traits<DataType, Adopting>::ConstructorType aData)
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{
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variant_storage_traits<DataType, Adopting>::storage_conversion(aData, &mData);
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}
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NS_IMETHOD GetDataType(uint16_t *_type)
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{
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*_type = variant_traits<DataType>::type();
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return NS_OK;
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}
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NS_IMETHOD GetAsInt32(int32_t *_integer)
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{
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return variant_integer_traits<DataType, Adopting>::asInt32(mData, _integer);
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}
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NS_IMETHOD GetAsInt64(int64_t *_integer)
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{
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return variant_integer_traits<DataType, Adopting>::asInt64(mData, _integer);
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}
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NS_IMETHOD GetAsDouble(double *_double)
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{
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return variant_float_traits<DataType, Adopting>::asDouble(mData, _double);
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}
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NS_IMETHOD GetAsAUTF8String(nsACString &_str)
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{
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return variant_text_traits<DataType, Adopting>::asUTF8String(mData, _str);
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}
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NS_IMETHOD GetAsAString(nsAString &_str)
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{
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return variant_text_traits<DataType, Adopting>::asString(mData, _str);
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}
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NS_IMETHOD GetAsArray(uint16_t *_type,
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nsIID *,
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uint32_t *_size,
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void **_data)
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{
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return variant_blob_traits<DataType, Adopting>::asArray(mData, _type, _size, _data);
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}
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private:
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typename variant_storage_traits<DataType, Adopting>::StorageType mData;
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};
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////////////////////////////////////////////////////////////////////////////////
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//// Handy typedefs! Use these for the right mapping.
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typedef Variant<int64_t> IntegerVariant;
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typedef Variant<double> FloatVariant;
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typedef Variant<nsString> TextVariant;
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typedef Variant<nsCString> UTF8TextVariant;
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typedef Variant<uint8_t[], false> BlobVariant;
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typedef Variant<uint8_t[], true> AdoptedBlobVariant;
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} // namespace storage
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} // namespace mozilla
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#include "Variant_inl.h"
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#endif // mozilla_storage_Variant_h__
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