qsettings.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

        }
        // we treat non-existent files as if they existed but were empty
        return true;
    }
}

void QConfFileSettingsPrivate::initFormat()
{
    extension = (format == QSettings::NativeFormat) ? QLatin1String(".conf") : QLatin1String(".ini");
    readFunc = 0;
    writeFunc = 0;
#ifdef Q_OS_MAC
    caseSensitivity = (format == QSettings::NativeFormat) ? Qt::CaseSensitive : Qt::CaseInsensitive;
#else
    caseSensitivity = Qt::CaseInsensitive;
#endif

    if (format > QSettings::IniFormat) {
        QMutexLocker locker(globalMutex());
        const CustomFormatVector *customFormatVector = customFormatVectorFunc();

        int i = (int)format - (int)QSettings::CustomFormat1;
        if (i >= 0 && i < customFormatVector->size()) {
            QConfFileCustomFormat info = customFormatVector->at(i);
            extension = info.extension;
            readFunc = info.readFunc;
            writeFunc = info.writeFunc;
            caseSensitivity = info.caseSensitivity;
        }
    }
}

void QConfFileSettingsPrivate::initAccess()
{
    bool readAccess = false;
    if (confFiles[spec]) {
        readAccess = checkAccess(confFiles[spec]->name);
        if (format > QSettings::IniFormat) {
            if (!readFunc)
                readAccess = false;
        }
    }

    if (!readAccess)
        setStatus(QSettings::AccessError);

    sync();       // loads the files the first time
}

#ifdef Q_OS_WIN
static QString windowsConfigPath(int type)
{
    QString result;

#ifndef QT_NO_QOBJECT
    // We can't use QLibrary if there is QT_NO_QOBJECT is defined
    // This only happens when bootstrapping qmake.
    QLibrary library("shell32");
    QT_WA( {
        typedef BOOL (WINAPI*GetSpecialFolderPath)(HWND, LPTSTR, int, BOOL);
        GetSpecialFolderPath SHGetSpecialFolderPath = (GetSpecialFolderPath)library.resolve("SHGetSpecialFolderPathW");
        if (SHGetSpecialFolderPath) {
            TCHAR path[MAX_PATH];
            SHGetSpecialFolderPath(0, path, type, FALSE);
            result = QString::fromUtf16((ushort*)path);
        }
    } , {
        typedef BOOL (WINAPI*GetSpecialFolderPath)(HWND, char*, int, BOOL);
        GetSpecialFolderPath SHGetSpecialFolderPath = (GetSpecialFolderPath)library.resolve("SHGetSpecialFolderPathA");
        if (SHGetSpecialFolderPath) {
            char path[MAX_PATH];
            SHGetSpecialFolderPath(0, path, type, FALSE);
            result = QString::fromLocal8Bit(path);
        }
    } );
#endif // QT_NO_QOBJECT

    if (result.isEmpty()) {
        switch (type) {
        case CSIDL_COMMON_APPDATA:
            result = QLatin1String("C:\\temp\\qt-common");
            break;
        case CSIDL_APPDATA:
            result = QLatin1String("C:\\temp\\qt-user");
            break;
        default:
            ;
        }
    }

    return result;
}
#endif // Q_OS_WIN

static inline int pathHashKey(QSettings::Format format, QSettings::Scope scope)
{
    return int((uint(format) << 1) | uint(scope == QSettings::SystemScope));
}

static QString getPath(QSettings::Format format, QSettings::Scope scope)
{
    Q_ASSERT((int)QSettings::NativeFormat == 0);
    Q_ASSERT((int)QSettings::IniFormat == 1);

    QString homePath = QDir::homePath();
    QString systemPath;

    globalMutex()->lock();
    PathHash *pathHash = pathHashFunc();
    bool loadSystemPath = pathHash->isEmpty();
    globalMutex()->unlock();

    if (loadSystemPath) {
        /*
           QLibraryInfo::location() uses QSettings, so in order to
           avoid a dead-lock, we can't hold the global mutex while
           calling it.
       */
        systemPath = QLibraryInfo::location(QLibraryInfo::SettingsPath);
        systemPath += QLatin1Char('/');
    }

    QMutexLocker locker(globalMutex());
    if (pathHash->isEmpty()) {
        /*
           Lazy initialization of pathHash. We initialize the
           IniFormat paths and (on Unix) the NativeFormat paths.
           (The NativeFormat paths are not configurable for the
           Windows registry and the Mac CFPreferences.)
       */
#ifdef Q_OS_WIN
        pathHash->insert(pathHashKey(QSettings::IniFormat, QSettings::UserScope),
                         windowsConfigPath(CSIDL_APPDATA) + QDir::separator());
        pathHash->insert(pathHashKey(QSettings::IniFormat, QSettings::SystemScope),
                         windowsConfigPath(CSIDL_COMMON_APPDATA) + QDir::separator());
#else
        QString userPath;
        char *env = getenv("XDG_CONFIG_HOME");
        if (env == 0) {
            userPath = homePath;
            userPath += QLatin1Char('/');
#ifdef Q_WS_QWS
            userPath += QLatin1String("Settings");
#else
            userPath += QLatin1String(".config");
#endif
        } else if (*env == '/') {
            userPath = QLatin1String(env);
        } else {
            userPath = homePath;
            userPath += QLatin1Char('/');
            userPath += QLatin1String(env);
        }
        userPath += QLatin1Char('/');

        pathHash->insert(pathHashKey(QSettings::IniFormat, QSettings::UserScope), userPath);
        pathHash->insert(pathHashKey(QSettings::IniFormat, QSettings::SystemScope), systemPath);
#ifndef Q_OS_MAC
        pathHash->insert(pathHashKey(QSettings::NativeFormat, QSettings::UserScope), userPath);
        pathHash->insert(pathHashKey(QSettings::NativeFormat, QSettings::SystemScope), systemPath);
#endif
#endif
    }

    QString result = pathHash->value(pathHashKey(format, scope));
    if (!result.isEmpty())
        return result;

    // fall back on INI path
    return pathHash->value(pathHashKey(QSettings::IniFormat, scope));
}

QConfFileSettingsPrivate::QConfFileSettingsPrivate(QSettings::Format format,
                                                   QSettings::Scope scope,
                                                   const QString &organization,
                                                   const QString &application)
{
    int i;
    this->format = format;
    initFormat();

    for (i = 0; i < NumConfFiles; ++i)
        confFiles[i] = 0;

    QString org = organization;
    if (org.isEmpty()) {
        setStatus(QSettings::AccessError);
        org = QLatin1String("Unknown Organization");
    }

    QString appFile = org + QDir::separator() + application + extension;
    QString orgFile = org + extension;

    if (scope == QSettings::UserScope) {
        QString userPath = getPath(format, QSettings::UserScope);
        if (!application.isEmpty())
            confFiles[F_User | F_Application] = QConfFile::fromName(userPath + appFile, true);
        confFiles[F_User | F_Organization] = QConfFile::fromName(userPath + orgFile, true);
    }

    QString systemPath = getPath(format, QSettings::SystemScope);
    if (!application.isEmpty())
        confFiles[F_System | F_Application] = QConfFile::fromName(systemPath + appFile, false);
    confFiles[F_System | F_Organization] = QConfFile::fromName(systemPath + orgFile, false);

    for (i = 0; i < NumConfFiles; ++i) {
        if (confFiles[i]) {
            spec = i;
            break;
        }
    }

    initAccess();
}

QConfFileSettingsPrivate::QConfFileSettingsPrivate(const QString &fileName,
                                                   QSettings::Format format)
{
    this->format = format;
    initFormat();

    confFiles[0] = QConfFile::fromName(fileName, true);
    for (int i = 1; i < NumConfFiles; ++i)
        confFiles[i] = 0;

    initAccess();
}

QConfFileSettingsPrivate::~QConfFileSettingsPrivate()
{
    QMutexLocker locker(globalMutex());
    ConfFileHash *usedHash = usedHashFunc();
    ConfFileCache *unusedCache = unusedCacheFunc();

    for (int i = 0; i < NumConfFiles; ++i) {
        if (confFiles[i] && !confFiles[i]->ref.deref()) {
            if (usedHash)
                usedHash->remove(confFiles[i]->name);

            if (confFiles[i]->size == 0) {
                delete confFiles[i];
            } else if (unusedCache) {
                unusedCache->insert(confFiles[i]->name, confFiles[i],
                                    10 + (confFiles[i]->originalKeys.size() / 4));
            }
        }
    }
}

void QConfFileSettingsPrivate::remove(const QString &key)
{
    QConfFile *confFile = confFiles[spec];
    if (!confFile)
        return;

    QSettingsKey theKey(key, caseSensitivity);
    QSettingsKey prefix(key + QLatin1Char('/'), caseSensitivity);
    QMutexLocker locker(&confFile->mutex);

    InternalSettingsMap::iterator i = confFile->addedKeys.lowerBound(prefix);
    while (i != confFile->addedKeys.end() && i.key().startsWith(prefix))
        i = confFile->addedKeys.erase(i);
    confFile->addedKeys.remove(theKey);

    InternalSettingsMap::const_iterator j = confFile->originalKeys.lowerBound(prefix);
    while (j != confFile->originalKeys.constEnd() && j.key().startsWith(prefix)) {
        confFile->removedKeys.insert(j.key(), QVariant());
        ++j;
    }
    if (confFile->originalKeys.contains(theKey))
        confFile->removedKeys.insert(theKey, QVariant());
}

void QConfFileSettingsPrivate::set(const QString &key, const QVariant &value)
{
    QConfFile *confFile = confFiles[spec];
    if (!confFile)
        return;

    QSettingsKey theKey(key, caseSensitivity);
    QMutexLocker locker(&confFile->mutex);
    confFile->removedKeys.remove(theKey);
    confFile->addedKeys.insert(theKey, value);
}

bool QConfFileSettingsPrivate::get(const QString &key, QVariant *value) const
{
    QSettingsKey theKey(key, caseSensitivity);
    InternalSettingsMap::const_iterator j;
    bool found = false;

    for (int i = 0; i < NumConfFiles; ++i) {
        if (QConfFile *confFile = confFiles[i]) {
            QMutexLocker locker(&confFile->mutex);

            if (!confFile->addedKeys.isEmpty()) {
                j = confFile->addedKeys.find(theKey);
                found = (j != confFile->addedKeys.constEnd());
            }
            if (!found) {
                j = confFile->originalKeys.find(theKey);
                found = (j != confFile->originalKeys.constEnd()
                         && !confFile->removedKeys.contains(theKey));
            }

            if (found && value)
                *value = *j;

            if (found)
                return true;
            if (!fallbacks)
                break;
        }
    }
    return false;
}

QStringList QConfFileSettingsPrivate::children(const QString &prefix, ChildSpec spec) const
{
    QMap<QString, QString> result;
    InternalSettingsMap::const_iterator j;

    QSettingsKey thePrefix(prefix, caseSensitivity);
    int startPos = prefix.size();

    for (int i = 0; i < NumConfFiles; ++i) {
        if (QConfFile *confFile = confFiles[i]) {
            QMutexLocker locker(&confFile->mutex);

            j = confFile->originalKeys.lowerBound(thePrefix);
            while (j != confFile->originalKeys.constEnd() && j.key().startsWith(thePrefix)) {
                if (!confFile->removedKeys.contains(j.key()))
                    processChild(j.key().realKey().mid(startPos), spec, result);
                ++j;
            }

            j = confFile->addedKeys.lowerBound(thePrefix);
            while (j != confFile->addedKeys.constEnd() && j.key().startsWith(thePrefix)) {
                processChild(j.key().realKey().mid(startPos), spec, result);
                ++j;
            }

            if (!fallbacks)
                break;
        }
    }
    return result.keys();
}

void QConfFileSettingsPrivate::clear()
{
    QConfFile *confFile = confFiles[spec];
    if (!confFile)
        return;

    QMutexLocker locker(&confFile->mutex);
    confFile->addedKeys.clear();
    confFile->removedKeys = confFile->originalKeys;
}

void QConfFileSettingsPrivate::sync()
{
    // people probably won't be checking the status a whole lot, so in case of
    // error we just try to go on and make the best of it

    for (int i = 0; i < NumConfFiles; ++i) {
        QConfFile *confFile = confFiles[i];
        if (confFile) {
            QMutexLocker locker(&confFile->mutex);
            syncConfFile(i);
        }
    }
}

void QConfFileSettingsPrivate::flush()
{
    sync();
}

QString QConfFileSettingsPrivate::fileName() const
{
    QConfFile *confFile = confFiles[spec];
    if (!confFile)
        return QString();
    return confFile->name;
}

bool QConfFileSettingsPrivate::isWritable() const
{
    if (format > QSettings::IniFormat && !writeFunc)
        return false;

    QConfFile *confFile = confFiles[spec];
    if (!confFile)
        return false;

    if (QFile::exists(confFile->name)) {
        QFile file(confFile->name);;
        return file.open(QFile::ReadWrite);
    } else {
        // we use a temporary file to avoid race conditions
        QTemporaryFile file(confFile->name);
        return file.open();
    }
}

void QConfFileSettingsPrivate::syncConfFile(int confFileNo)
{
    QConfFile *confFile = confFiles[confFileNo];
    bool readOnly = confFile->addedKeys.isEmpty() && confFile->removedKeys.isEmpty();
    bool ok;

    /*
        We can often optimize the read-only case, if the file on disk
        hasn't changed.
    */