gecko-dev/toolkit/system/gnome/nsGSettingsService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/ArrayUtils.h"
#include "nsGSettingsService.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsMemory.h"
#include "prlink.h"
#include "nsComponentManagerUtils.h"
#include "nsIMutableArray.h"
#include "nsISupportsPrimitives.h"
#include <glib.h>
#include <glib-object.h>
using namespace mozilla;
typedef struct _GSettings GSettings;
typedef struct _GVariantType GVariantType;
typedef struct _GVariant GVariant;
#ifndef G_VARIANT_TYPE_INT32
# define G_VARIANT_TYPE_INT32 ((const GVariantType *) "i")
# define G_VARIANT_TYPE_BOOLEAN ((const GVariantType *) "b")
# define G_VARIANT_TYPE_STRING ((const GVariantType *) "s")
# define G_VARIANT_TYPE_OBJECT_PATH ((const GVariantType *) "o")
# define G_VARIANT_TYPE_SIGNATURE ((const GVariantType *) "g")
#endif
#ifndef G_VARIANT_TYPE_STRING_ARRAY
# define G_VARIANT_TYPE_STRING_ARRAY ((const GVariantType *) "as")
#endif
#define GSETTINGS_FUNCTIONS \
FUNC(g_settings_new, GSettings *, (const char* schema)) \
FUNC(g_settings_list_schemas, const char * const *, (void)) \
FUNC(g_settings_list_keys, char **, (GSettings* settings)) \
FUNC(g_settings_get_value, GVariant *, (GSettings* settings, const char* key)) \
FUNC(g_settings_set_value, gboolean, (GSettings* settings, const char* key, GVariant* value)) \
FUNC(g_settings_range_check, gboolean, (GSettings* settings, const char* key, GVariant* value)) \
FUNC(g_variant_get_int32, gint32, (GVariant* variant)) \
FUNC(g_variant_get_boolean, gboolean, (GVariant* variant)) \
FUNC(g_variant_get_string, const char *, (GVariant* value, gsize* length)) \
FUNC(g_variant_get_strv, const char **, (GVariant* value, gsize* length)) \
FUNC(g_variant_is_of_type, gboolean, (GVariant* value, const GVariantType* type)) \
FUNC(g_variant_new_int32, GVariant *, (gint32 value)) \
FUNC(g_variant_new_boolean, GVariant *, (gboolean value)) \
FUNC(g_variant_new_string, GVariant *, (const char* string)) \
FUNC(g_variant_unref, void, (GVariant* value))
#define FUNC(name, type, params) \
typedef type (*_##name##_fn) params; \
static _##name##_fn _##name;
GSETTINGS_FUNCTIONS
#undef FUNC
#define g_settings_new _g_settings_new
#define g_settings_list_schemas _g_settings_list_schemas
#define g_settings_list_keys _g_settings_list_keys
#define g_settings_get_value _g_settings_get_value
#define g_settings_set_value _g_settings_set_value
#define g_settings_range_check _g_settings_range_check
#define g_variant_get_int32 _g_variant_get_int32
#define g_variant_get_boolean _g_variant_get_boolean
#define g_variant_get_string _g_variant_get_string
#define g_variant_get_strv _g_variant_get_strv
#define g_variant_is_of_type _g_variant_is_of_type
#define g_variant_new_int32 _g_variant_new_int32
#define g_variant_new_boolean _g_variant_new_boolean
#define g_variant_new_string _g_variant_new_string
#define g_variant_unref _g_variant_unref
static PRLibrary *gioLib = nullptr;
class nsGSettingsCollection final : public nsIGSettingsCollection
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIGSETTINGSCOLLECTION
explicit nsGSettingsCollection(GSettings* aSettings) : mSettings(aSettings),
mKeys(nullptr) {}
private:
~nsGSettingsCollection();
bool KeyExists(const nsACString& aKey);
bool SetValue(const nsACString& aKey,
GVariant *aValue);
GSettings *mSettings;
char **mKeys;
};
nsGSettingsCollection::~nsGSettingsCollection()
{
g_strfreev(mKeys);
g_object_unref(mSettings);
}
bool
nsGSettingsCollection::KeyExists(const nsACString& aKey)
{
if (!mKeys)
mKeys = g_settings_list_keys(mSettings);
for (uint32_t i = 0; mKeys[i] != nullptr; i++) {
if (aKey.Equals(mKeys[i]))
return true;
}
return false;
}
bool
nsGSettingsCollection::SetValue(const nsACString& aKey,
GVariant *aValue)
{
if (!KeyExists(aKey) ||
!g_settings_range_check(mSettings,
PromiseFlatCString(aKey).get(),
aValue)) {
g_variant_unref(aValue);
return false;
}
return g_settings_set_value(mSettings,
PromiseFlatCString(aKey).get(),
aValue);
}
NS_IMPL_ISUPPORTS(nsGSettingsCollection, nsIGSettingsCollection)
NS_IMETHODIMP
nsGSettingsCollection::SetString(const nsACString& aKey,
const nsACString& aValue)
{
GVariant *value = g_variant_new_string(PromiseFlatCString(aValue).get());
if (!value)
return NS_ERROR_OUT_OF_MEMORY;
bool res = SetValue(aKey, value);
return res ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsGSettingsCollection::SetBoolean(const nsACString& aKey,
bool aValue)
{
GVariant *value = g_variant_new_boolean(aValue);
if (!value)
return NS_ERROR_OUT_OF_MEMORY;
bool res = SetValue(aKey, value);
return res ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsGSettingsCollection::SetInt(const nsACString& aKey,
int32_t aValue)
{
GVariant *value = g_variant_new_int32(aValue);
if (!value)
return NS_ERROR_OUT_OF_MEMORY;
bool res = SetValue(aKey, value);
return res ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsGSettingsCollection::GetString(const nsACString& aKey,
nsACString& aResult)
{
if (!KeyExists(aKey))
return NS_ERROR_INVALID_ARG;
GVariant *value = g_settings_get_value(mSettings,
PromiseFlatCString(aKey).get());
if (!g_variant_is_of_type(value, G_VARIANT_TYPE_STRING) &&
!g_variant_is_of_type(value, G_VARIANT_TYPE_OBJECT_PATH) &&
!g_variant_is_of_type(value, G_VARIANT_TYPE_SIGNATURE)) {
g_variant_unref(value);
return NS_ERROR_FAILURE;
}
aResult.Assign(g_variant_get_string(value, nullptr));
g_variant_unref(value);
return NS_OK;
}
NS_IMETHODIMP
nsGSettingsCollection::GetBoolean(const nsACString& aKey,
bool* aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
if (!KeyExists(aKey))
return NS_ERROR_INVALID_ARG;
GVariant *value = g_settings_get_value(mSettings,
PromiseFlatCString(aKey).get());
if (!g_variant_is_of_type(value, G_VARIANT_TYPE_BOOLEAN)) {
g_variant_unref(value);
return NS_ERROR_FAILURE;
}
gboolean res = g_variant_get_boolean(value);
*aResult = res ? true : false;
g_variant_unref(value);
return NS_OK;
}
NS_IMETHODIMP
nsGSettingsCollection::GetInt(const nsACString& aKey,
int32_t* aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
if (!KeyExists(aKey))
return NS_ERROR_INVALID_ARG;
GVariant *value = g_settings_get_value(mSettings,
PromiseFlatCString(aKey).get());
if (!g_variant_is_of_type(value, G_VARIANT_TYPE_INT32)) {
g_variant_unref(value);
return NS_ERROR_FAILURE;
}
*aResult = g_variant_get_int32(value);
g_variant_unref(value);
return NS_OK;
}
// These types are local to nsGSettingsService::Init, but ISO C++98 doesn't
// allow a template (ArrayLength) to be instantiated based on a local type.
// Boo-urns!
typedef void (*nsGSettingsFunc)();
struct nsGSettingsDynamicFunction {
const char *functionName;
nsGSettingsFunc *function;
};
NS_IMETHODIMP
nsGSettingsCollection::GetStringList(const nsACString& aKey, nsIArray** aResult)
{
if (!KeyExists(aKey))
return NS_ERROR_INVALID_ARG;
nsCOMPtr<nsIMutableArray> items(do_CreateInstance(NS_ARRAY_CONTRACTID));
if (!items) {
return NS_ERROR_OUT_OF_MEMORY;
}
GVariant *value = g_settings_get_value(mSettings,
PromiseFlatCString(aKey).get());
if (!g_variant_is_of_type(value, G_VARIANT_TYPE_STRING_ARRAY)) {
g_variant_unref(value);
return NS_ERROR_FAILURE;
}
const gchar ** gs_strings = g_variant_get_strv(value, nullptr);
if (!gs_strings) {
// empty array
items.forget(aResult);
g_variant_unref(value);
return NS_OK;
}
const gchar** p_gs_strings = gs_strings;
while (*p_gs_strings != nullptr)
{
nsCOMPtr<nsISupportsCString> obj(do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
if (obj) {
obj->SetData(nsDependentCString(*p_gs_strings));
items->AppendElement(obj);
}
p_gs_strings++;
}
g_free(gs_strings);
items.forget(aResult);
g_variant_unref(value);
return NS_OK;
}
nsresult
nsGSettingsService::Init()
{
#define FUNC(name, type, params) { #name, (nsGSettingsFunc *)&_##name },
static const nsGSettingsDynamicFunction kGSettingsSymbols[] = {
GSETTINGS_FUNCTIONS
};
#undef FUNC
if (!gioLib) {
gioLib = PR_LoadLibrary("libgio-2.0.so.0");
if (!gioLib)
return NS_ERROR_FAILURE;
}
for (auto GSettingsSymbol : kGSettingsSymbols) {
*GSettingsSymbol.function =
PR_FindFunctionSymbol(gioLib, GSettingsSymbol.functionName);
if (!*GSettingsSymbol.function) {
return NS_ERROR_FAILURE;
}
}
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsGSettingsService, nsIGSettingsService)
nsGSettingsService::~nsGSettingsService()
{
if (gioLib) {
PR_UnloadLibrary(gioLib);
gioLib = nullptr;
}
}
NS_IMETHODIMP
nsGSettingsService::GetCollectionForSchema(const nsACString& schema,
nsIGSettingsCollection** collection)
{
NS_ENSURE_ARG_POINTER(collection);
const char * const *schemas = g_settings_list_schemas();
for (uint32_t i = 0; schemas[i] != nullptr; i++) {
if (schema.Equals(schemas[i])) {
GSettings *settings = g_settings_new(PromiseFlatCString(schema).get());
nsGSettingsCollection *mozGSettings = new nsGSettingsCollection(settings);
NS_ADDREF(*collection = mozGSettings);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}