refs #336 Added class CLogCategory to represent a log category. The category logic of CLogMessage is moved into this new class.

src/blackmisc/blackmiscfreefunctions.cpp

@@ -173,6 +173,8 @@ void BlackMisc::registerMetadata()
     CIcon::registerMetadata();
     CIconList::registerMetadata();
     CHotkeyFunction::registerMetadata();
+    CLogCategory::registerMetadata();
+    CLogCategoryList::registerMetadata();
 
     // sub namespaces
     PhysicalQuantities::registerMetadata();

src/blackmisc/logcategory.cpp

@@ -0,0 +1,67 @@
+/* Copyright (C) 2014
+ * Swift Project Community / Contributors
+ *
+ * This file is part of Swift Project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of Swift Project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "logcategory.h"
+
+namespace BlackMisc
+{
+    void CLogCategory::registerMetadata()
+    {
+        qRegisterMetaType<CLogCategory>();
+        qDBusRegisterMetaType<CLogCategory>();
+    }
+
+    uint CLogCategory::getValueHash() const
+    {
+        return qHash(TupleConverter<CLogCategory>::toMetaTuple(*this));
+    }
+
+    bool CLogCategory::operator ==(const CLogCategory &other) const
+    {
+        return TupleConverter<CLogCategory>::toMetaTuple(*this) == TupleConverter<CLogCategory>::toMetaTuple(other);
+    }
+
+    bool CLogCategory::operator !=(const CLogCategory &other) const
+    {
+        return TupleConverter<CLogCategory>::toMetaTuple(*this) != TupleConverter<CLogCategory>::toMetaTuple(other);
+    }
+
+    QString CLogCategory::convertToQString(bool i18n) const
+    {
+        Q_UNUSED(i18n);
+        return m_string;
+    }
+
+    int CLogCategory::getMetaTypeId() const
+    {
+        return qMetaTypeId<CLogCategory>();
+    }
+
+    bool CLogCategory::isA(int metaTypeId) const
+    {
+        if (metaTypeId == qMetaTypeId<CLogCategory>()) { return true; }
+        return this->CValueObject::isA(metaTypeId);
+    }
+
+    int CLogCategory::compareImpl(const CValueObject &otherBase) const
+    {
+        const auto &other = static_cast<const CLogCategory &>(otherBase);
+        return compare(TupleConverter<CLogCategory>::toMetaTuple(*this), TupleConverter<CLogCategory>::toMetaTuple(other));
+    }
+
+    void CLogCategory::marshallToDbus(QDBusArgument &argument) const
+    {
+        argument << TupleConverter<CLogCategory>::toMetaTuple(*this);
+    }
+
+    void CLogCategory::unmarshallFromDbus(const QDBusArgument &argument)
+    {
+        argument >> TupleConverter<CLogCategory>::toMetaTuple(*this);
+    }
+}

src/blackmisc/logcategory.h

@@ -0,0 +1,153 @@
+/* Copyright (C) 2014
+ * Swift Project Community / Contributors
+ *
+ * This file is part of Swift Project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of Swift Project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKMISC_LOGCATEGORY_H
+#define BLACKMISC_LOGCATEGORY_H
+
+//! \file
+
+#include "sequence.h"
+
+namespace BlackMisc
+{
+    /*!
+     * A log category is an arbitrary string tag which can be attached to log messages.
+     *
+     * A log handler can filter messages based on their categories.
+     */
+    class CLogCategory : public CValueObject
+    {
+    public:
+        //! \name Predefined special categories (public static methods)
+        //! @{
+
+        //! Uncategorized
+        static const CLogCategory &uncategorized()
+        {
+            static const CLogCategory cat { "swift.uncategorized" };
+            return cat;
+        }
+
+        //! Validation
+        static const CLogCategory &validation()
+        {
+            static const CLogCategory cat { "swift.validation" };
+            return cat;
+        }
+
+        //! Settings updates
+        static const CLogCategory &settingsUpdate()
+        {
+            static const CLogCategory cat { "swift.settings.update" };
+            return cat;
+        }
+
+        //! Contexts
+        static const CLogCategory &context()
+        {
+            static const CLogCategory cat { "swift.context" };
+            return cat;
+        }
+
+        //! Context slots
+        static const CLogCategory &contextSlot()
+        {
+            static const CLogCategory cat { "swift.context.slot" };
+            return cat;
+        }
+
+        //! GUI components
+        static const CLogCategory &guiComponent()
+        {
+            static const CLogCategory cat { "swift.gui.component" };
+            return cat;
+        }
+
+        //! All predefined special categories
+        static const QList<CLogCategory> &allSpecialCategories()
+        {
+            static const QList<CLogCategory> cats
+            {
+                uncategorized(),
+                validation(),
+                settingsUpdate(),
+                context(),
+                contextSlot(),
+                guiComponent()
+            };
+            return cats;
+        }
+
+        //! @}
+
+        //! Constructor.
+        CLogCategory() = default;
+
+        //! Constructor.
+        CLogCategory(const QString &categoryString) : m_string(categoryString) {}
+
+        //! Constructor.
+        CLogCategory(const char *categoryString) : m_string(categoryString) {}
+
+        //! Returns true if the category string starts with the given prefix.
+        bool startsWith(const QString &prefix) const { return m_string.startsWith(prefix); }
+
+        //! Returns true if the category string ends with the given suffix.
+        bool endsWith(const QString &suffix) const { return m_string.endsWith(suffix); }
+
+        //! Returns true if the category string contains the given substring.
+        bool contains(const QString &substring) const { return m_string.contains(substring); }
+
+        //! Register metadata
+        static void registerMetadata();
+
+        //! \copydoc CValueObject::toQVariant
+        virtual QVariant toQVariant() const override { return QVariant::fromValue(*this); }
+
+        //! \copydoc CValueObject::convertFromQVariant
+        virtual void convertFromQVariant(const QVariant &variant) override { BlackMisc::setFromQVariant(this, variant); }
+
+        //! \copydoc CValueObject::getValueHash
+        virtual uint getValueHash() const override;
+
+        //! Equal operator
+        bool operator ==(const CLogCategory &other) const;
+
+        //! Not equal operator
+        bool operator !=(const CLogCategory &other) const;
+
+    protected:
+        //! \copydoc CValueObject::convertToQString()
+        virtual QString convertToQString(bool i18n = false) const override;
+
+        //! \copydoc CValueObject::getMetaTypeId
+        virtual int getMetaTypeId() const override;
+
+        //! \copydoc CValueObject::isA
+        virtual bool isA(int metaTypeId) const override;
+
+        //! \copydoc CValueObject::compareImpl
+        virtual int compareImpl(const CValueObject &other) const override;
+
+        //! \copydoc CValueObject::marshallToDbus()
+        virtual void marshallToDbus(QDBusArgument &argument) const override;
+
+        //! \copydoc CValueObject::marshallFromDbus()
+        virtual void unmarshallFromDbus(const QDBusArgument &argument) override;
+
+    private:
+        BLACK_ENABLE_TUPLE_CONVERSION(CLogCategory)
+        QString m_string;
+    };
+}
+
+Q_DECLARE_METATYPE(BlackMisc::CLogCategory)
+BLACK_DECLARE_TUPLE_CONVERSION(BlackMisc::CLogCategory, (o.m_string))
+
+#endif

src/blackmisc/logcategorylist.cpp

@@ -0,0 +1,58 @@
+/* Copyright (C) 2014
+ * Swift Project Community / Contributors
+ *
+ * This file is part of Swift Project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of Swift Project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "logcategorylist.h"
+
+namespace BlackMisc
+{
+    void CLogCategoryList::appendCategoriesFromMetaObject(const QMetaObject &metaObject)
+    {
+        for (auto *meta = &metaObject; meta; meta = meta->superClass())
+        {
+            push_back(meta->className());
+        }
+    }
+
+    QStringList CLogCategoryList::toQStringList() const
+    {
+        return transform([](const CLogCategory &cat) { return cat.toQString(); });
+    }
+
+    QString CLogCategoryList::convertToQString(bool i18n) const
+    {
+        Q_UNUSED(i18n); // log categories are always Latin-1
+        return toQStringList().join("|");
+    }
+
+    CLogCategoryList CLogCategoryList::fromQStringList(const QStringList &stringList)
+    {
+        return makeRange(Iterators::makeTransformIterator(stringList.begin(), [](const QString &str) { return CLogCategory{str}; }), stringList.end());
+    }
+
+    CLogCategoryList CLogCategoryList::fromQString(const QString &string)
+    {
+        return fromQStringList(string.split("|"));
+    }
+
+    bool CLogCategoryList::anyStartWith(const QString &prefix) const
+    {
+        return containsBy([ = ](const CLogCategory &cat) { return cat.startsWith(prefix); });
+    }
+
+    bool CLogCategoryList::anyEndWith(const QString &suffix) const
+    {
+        return containsBy([ = ](const CLogCategory &cat) { return cat.endsWith(suffix); });
+    }
+
+    void CLogCategoryList::registerMetadata()
+    {
+        qRegisterMetaType<CLogCategoryList>();
+        qDBusRegisterMetaType<CLogCategoryList>();
+    }
+}

src/blackmisc/logcategorylist.h

@@ -0,0 +1,144 @@
+/* Copyright (C) 2014
+ * Swift Project Community / Contributors
+ *
+ * This file is part of Swift Project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of Swift Project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#ifndef BLACKMISC_LOGCATEGORYLIST_H
+#define BLACKMISC_LOGCATEGORYLIST_H
+
+//! \file
+
+#include "logcategory.h"
+#include "sequence.h"
+#include "collection.h"
+#include <QObject>
+#include <QThreadStorage>
+#include <type_traits>
+
+namespace BlackMisc
+{
+    namespace Private
+    {
+        //! \private Trait to detect whether a class T has a member function called getLogCategories
+        template <class T> class HasGetLogCategories
+        {
+            struct Base { int getLogCategories; };
+            struct Derived : T, Base {};
+            template <typename U, U> struct TypeCheck {};
+            template <typename U> static std::false_type test(TypeCheck<decltype(&Base::getLogCategories), &U::getLogCategories> *);
+            template <typename U> static std::true_type test(...);
+        public:
+            using type = decltype(test<Derived>(nullptr));
+        };
+    }
+
+    /*!
+     * A sequence of log categories.
+     */
+    class CLogCategoryList : public CSequence<CLogCategory>
+    {
+    public:
+        //! Empty constructor.
+        CLogCategoryList() = default;
+
+        //! Copy constructor.
+        CLogCategoryList(const CLogCategoryList &) = default;
+
+        //! Copy construct from superclass instance.
+        CLogCategoryList(const CSequence<CLogCategory> &other) : CSequence<CLogCategory>(other) {}
+
+        //! Initializer list constructor.
+        CLogCategoryList(std::initializer_list<CLogCategory> il) : CSequence<CLogCategory>(il) {}
+
+        //! Copy assignment.
+        CLogCategoryList &operator =(const CLogCategoryList &) = default;
+
+        //! Copy assign from superclass instance.
+        CLogCategoryList &operator =(const CSequence<CLogCategory> &other) { CSequence<CLogCategory>::operator =(other); return *this; }
+
+        /*!
+         * Construct by extracting categories from a class T.
+         *
+         * If T has a member function getLogCategories, then this will be called.
+         * If T inherits from QObject then we get the name of the class and all its superclasses.
+         * If T is registered with QMetaType then we get the name of the class.
+         * If more than one of the above cases is true, then all are combined into the list.
+         * If none of the above cases is true, then the constructed list will be the uncategorized category.
+         *
+         * This constructor will be disabled if T is not a class type.
+         *
+         * \param pointer The value of pointer is unimportant. Only the static type T is considered.
+         *                It is legal to pass static_cast<T>(nullptr), but in member functions passing the <tt>this</tt> pointer is easier.
+         */
+        template <typename T, typename = typename std::enable_if<std::is_class<T>::value>::type>
+        CLogCategoryList(const T *pointer) : CLogCategoryList(fromClass<T>()) { Q_UNUSED(pointer); }
+
+        //! Convert each of the categories to a QString and return the result as a QStringList.
+        QStringList toQStringList() const;
+
+        //! Convert a string list, such as that returned by toQStringList(), into a CLogCategoryList.
+        static CLogCategoryList fromQStringList(const QStringList &stringList);
+
+        //! Convert a string, such as that returned by toQString(), into a CLogCategoryList.
+        static CLogCategoryList fromQString(const QString &string);
+
+        //! Returns true if any of the categories in the list start with the given prefix.
+        bool anyStartWith(const QString &prefix) const;
+
+        //! Returns true if any of the categories in the list end with the given suffix.
+        bool anyEndWith(const QString &suffix) const;
+
+        //! Register metadata
+        static void registerMetadata();
+
+    protected:
+        //! \copydoc BlackMisc::CValueObject::convertToQString
+        virtual QString convertToQString(bool i18n = false) const override;
+
+    private:
+        /*
+         * Templates used by the constructor template:
+         */
+        template <typename T>
+        struct tag {};
+
+        template <typename T>
+        static const CLogCategoryList &fromClass()
+        {
+            static_assert(sizeof(T) > 0, "T must be a complete type, not forward declared");
+            static QThreadStorage<CLogCategoryList> list;
+            if (! list.hasLocalData())
+            {
+                list.localData().appendCategoriesFromMemberFunction(tag<T>(), typename Private::HasGetLogCategories<T>::type());
+                list.localData().appendCategoriesFromMetaType(tag<T>(), std::integral_constant<bool, QMetaTypeId<T>::Defined>());
+                list.localData().appendCategoriesFromMetaObject(tag<T>(), std::is_base_of<QObject, T>());
+                if (list.localData().isEmpty()) { list.localData().push_back(CLogCategory::uncategorized()); }
+            }
+            return list.localData();
+        }
+
+        template <typename T>
+        void appendCategoriesFromMemberFunction(tag<T>, std::true_type) { push_back(T::getLogCategories()); }
+        void appendCategoriesFromMemberFunction(...) {}
+
+        template <typename T>
+        void appendCategoriesFromMetaType(tag<T>, std::true_type) { push_back(QMetaType::typeName(qMetaTypeId<T>())); }
+        void appendCategoriesFromMetaType(...) {}
+
+        template <typename T>
+        void appendCategoriesFromMetaObject(tag<T>, std::true_type) { appendCategoriesFromMetaObject(T::staticMetaObject); }
+        void appendCategoriesFromMetaObject(...) {}
+
+        void appendCategoriesFromMetaObject(const QMetaObject &);
+    };
+}
+
+Q_DECLARE_METATYPE(BlackMisc::CLogCategoryList)
+Q_DECLARE_METATYPE(BlackMisc::CCollection<BlackMisc::CLogCategory>)
+Q_DECLARE_METATYPE(BlackMisc::CSequence<BlackMisc::CLogCategory>)
+
+#endif

src/blackmisc/loghandler.cpp

@@ -64,12 +64,12 @@ namespace BlackMisc
         return m_categoryPrefixHandlers[category];
     }
 
-    QList<CLogCategoryHandler *> CLogHandler::handlersForCategory(const QString &category) const
+    QList<CLogCategoryHandler *> CLogHandler::handlersForCategories(const CLogCategoryList &categories) const
     {
         QList<CLogCategoryHandler *> m_handlers;
         for (auto i = m_categoryPrefixHandlers.begin(); i != m_categoryPrefixHandlers.end(); ++i)
         {
-            if (category.startsWith(i.key()))
+            if (categories.anyStartWith(i.key()))
             {
                 m_handlers.push_back(i.value());
             }
@@ -114,7 +114,7 @@ namespace BlackMisc
 
     void CLogHandler::logMessage(const CStatusMessage &statusMessage)
     {
-        auto handlers = handlersForCategory(statusMessage.getCategory());
+        auto handlers = handlersForCategories(statusMessage.getCategories());
 
         if (isFallThroughEnabled(handlers))
         {

src/blackmisc/loghandler.h

@@ -69,7 +69,7 @@ namespace BlackMisc
         bool m_enableFallThrough = true;
         bool isFallThroughEnabled(const QList<CLogCategoryHandler *> &handlers) const;
         QMap<QString, CLogCategoryHandler *> m_categoryPrefixHandlers;
-        QList<CLogCategoryHandler *> handlersForCategory(const QString &category) const;
+        QList<CLogCategoryHandler *> handlersForCategories(const CLogCategoryList &categories) const;
     };
 
     /*!

src/blackmisc/logmessage.cpp

@@ -13,34 +13,29 @@
 namespace BlackMisc
 {
 
-    CLogMessage &CLogMessage::debugImpl(QString format, QString category)
+    CLogMessage &CLogMessage::debug()
     {
         m_severity = CStatusMessage::SeverityDebug;
-        m_category = category;
-        m_message = format;
         return *this;
     }
 
-    CLogMessage &CLogMessage::infoImpl(QString format, QString category)
+    CLogMessage &CLogMessage::info(QString format)
     {
         m_severity = CStatusMessage::SeverityInfo;
-        m_category = category;
         m_message = format;
         return *this;
     }
 
-    CLogMessage &CLogMessage::warningImpl(QString format, QString category)
+    CLogMessage &CLogMessage::warning(QString format)
     {
         m_severity = CStatusMessage::SeverityWarning;
-        m_category = category;
         m_message = format;
         return *this;
     }
 
-    CLogMessage &CLogMessage::errorImpl(QString format, QString category)
+    CLogMessage &CLogMessage::error(QString format)
     {
         m_severity = CStatusMessage::SeverityError;
-        m_category = category;
         m_message = format;
         return *this;
     }
@@ -48,7 +43,7 @@ namespace BlackMisc
     CLogMessage::operator CStatusMessage()
     {
         m_redundant = true;
-        return { m_category, m_severity, message() };
+        return { m_categories, m_severity, message() };
     }
 
     CLogMessage::operator CVariant()
@@ -62,21 +57,21 @@ namespace BlackMisc
 
         // FIXME hack to avoid putting quote characters around the message
         // should be safe, but still it's horrible, we could directly call qt_message_output instead
-        QByteArray category = encodedCategory();
+        QByteArray category = qtCategory();
         QDebug debug = ostream(category);
         auto &stream = **reinterpret_cast<QTextStream**>(&debug); // should be safe because it is relying on Qt's guarantee of ABI compatibility
         stream << message();
     }
 
-    QByteArray CLogMessage::encodedCategory() const
+    QByteArray CLogMessage::qtCategory() const
     {
-        if (m_category.isEmpty())
+        if (m_categories.isEmpty())
         {
             return {};
         }
         else
         {
-            QString category = m_category;
+            QString category = m_categories.toQString();
             if (m_severity == CStatusMessage::SeverityDebug) { category = CLogMessageHelper::addDebugFlag(category); }
             if (m_redundant) { category = CLogMessageHelper::addRedundantFlag(category); }
             return category.toLatin1();
@@ -85,7 +80,7 @@ namespace BlackMisc
 
     QDebug CLogMessage::ostream(const QByteArray &category) const
     {
-        if (m_category.isEmpty())
+        if (m_categories.isEmpty())
         {
             switch (m_severity)
             {

src/blackmisc/logmessage.h

@@ -13,6 +13,7 @@
 //! \file
 
 #include "statusmessage.h"
+#include "logcategorylist.h"
 #include "index_sequence.h"
 #include <QDebug>
 #include <QLoggingCategory>
@@ -64,16 +65,29 @@ namespace BlackMisc
      * The member functions debug, info, warning, error, and the stream operators all return a reference to <tt>*this</tt>,
      * so they can be chained together.
      *
-     * The category string identifies the origin of the message (e.g. network system) or its subtype (e.g. validation).
+     * The categories are arbitrary string tags which can be attached to the message to categorize it.
+     * A message can have more than one category. The categories can be used for filtering by message handlers.
      */
     class CLogMessage
     {
     public:
-        //! Constructor.
+        //! Construct a message with the "uncategorized" category.
         CLogMessage() {}
 
-        //! Constructor taking filename, line number, and function name, for verbose debug messages.
-        CLogMessage(const char *file, int line, const char *function): m_logger(file, line, function) {}
+        //! Constructor taking filename, line number, and function name, for uncategorized verbose debug messages.
+        CLogMessage(const char *file, int line, const char *function) : m_logger(file, line, function) {}
+
+        //! Construct a message with some specific category.
+        CLogMessage(const CLogCategory &category) : m_categories({ category }) {}
+
+        //! Construct a message with some specific categories.
+        CLogMessage(const CLogCategoryList &categories) : m_categories(categories) {}
+
+        //! Construct a message with some specific categories.
+        CLogMessage(const CLogCategoryList &categories, const CLogCategory &extra) : CLogMessage(categories) { m_categories.push_back(extra); }
+
+        //! Construct a message with some specific categories.
+        CLogMessage(const CLogCategoryList &categories, const CLogCategoryList &extra) : CLogMessage(categories) { m_categories.push_back(extra); }
 
         //! Destructor. This actually emits the message.
         ~CLogMessage();
@@ -84,48 +98,17 @@ namespace BlackMisc
         //! Convert to CVariant for returning the message directly from the function which generated it.
         operator CVariant();
 
-        //! Set the severity to debug, with the default category.
-        CLogMessage &debug() { return debugImpl(""); }
+        //! Set the severity to debug.
+        CLogMessage &debug();
 
-        //! Set the severity to debug, with a category string.
-        CLogMessage &debug(QString category) { return debugImpl("", category); }
+        //! Set the severity to info, providing a format string.
+        CLogMessage &info(QString format);
 
-        //! Set the severity to debug, with the category string obtained from the getMessageCategory method of the sender.
-        //! \note To avoid overload ambiguity, this method is disabled if T is not a class type.
-        template <class T, class = typename std::enable_if<std::is_class<typename std::decay<T>::type>::value>::type>
-        CLogMessage &debug(T *sender) { Q_UNUSED(sender); return debugImpl("", sender->getMessageCategory()); }
+        //! Set the severity to warning, providing a format string.
+        CLogMessage &warning(QString format);
 
-        //! Set the severity to info, providing a format string, with the default category.
-        CLogMessage &info(QString format) { return infoImpl(format); }
-
-        //! Set the severity to info, providing a format string and category string.
-        CLogMessage &info(QString category, QString format) { return infoImpl(format, category); }
-
-        //! Set the severity to info, providing a format string, with the category string obtained from the getMessageCategory method of the sender.
-        //! \note To avoid overload ambiguity, this method is disabled if T is not a class type.
-        template <class T, class = typename std::enable_if<std::is_class<typename std::decay<T>::type>::value>::type>
-        CLogMessage &info(T *sender, QString format) { Q_UNUSED(sender); return infoImpl(format, sender->getMessageCategory()); }
-
-        //! Set the severity to warning, providing a format string, with the default category.
-        CLogMessage &warning(QString format) { return warningImpl(format); }
-
-        //! Set the severity to warning, providing a format string and category string.
-        CLogMessage &warning(QString category, QString format) { return warningImpl(format, category); }
-
-        //! Set the severity to warning, providing a format string, with the category string obtained from the getMessageCategory method of the sender.
-        //! \note To avoid overload ambiguity, this method is disabled if T is not a class type.
-        template <class T, class = typename std::enable_if<std::is_class<typename std::decay<T>::type>::value>::type>
-        CLogMessage &warning(T *sender, QString format) { Q_UNUSED(sender); return warningImpl(format, sender->getMessageCategory()); }
-
-        //! Set the severity to error, providing a format string, with the default category.
-        CLogMessage &error(QString format) { return errorImpl(format); }
-
-        //! Set the severity to error, providing a format string and category string.
-        CLogMessage &error(QString category, QString format) { return errorImpl(format, category); }
-
-        //! Set the severity to error, providing a format string, with the category string obtained from the getMessageCategory method of the sender.
-        template <class T, class = typename std::enable_if<std::is_class<typename std::decay<T>::type>::value>::type>
-        CLogMessage &error(T *sender, QString format) { Q_UNUSED(sender); return errorImpl(format, sender->getMessageCategory()); }
+        //! Set the severity to error, providing a format string.
+        CLogMessage &error(QString format);
 
         //! Streaming operators.
         //! \details If the format string is empty, the message will consist of all streamed values separated by spaces.
@@ -147,24 +130,17 @@ namespace BlackMisc
         CLogMessage &operator <<(const CValueObject &v) { return arg(v.toQString()); }
         //! @}
 
-        //! The default message category which is used if a category is not provided.
-        static const char *defaultMessageCategory() { return "swift"; }
-
     private:
         QMessageLogger m_logger;
         CStatusMessage::StatusSeverity m_severity = CStatusMessage::SeverityDebug;
-        QString m_category;
+        CLogCategoryList m_categories = CLogCategoryList { CLogCategory::uncategorized() };
         QString m_message;
         QStringList m_args;
         bool m_redundant = false;
 
-        CLogMessage &debugImpl(QString format, QString category = defaultMessageCategory());
-        CLogMessage &infoImpl(QString format, QString category = defaultMessageCategory());
-        CLogMessage &warningImpl(QString format, QString category = defaultMessageCategory());
-        CLogMessage &errorImpl(QString format, QString category = defaultMessageCategory());
         CLogMessage &arg(QString value) { m_args.push_back(value); return *this; }
         QString message() const;
-        QByteArray encodedCategory() const;
+        QByteArray qtCategory() const;
         QDebug ostream(const QByteArray &category) const;
     };
 }

src/blackmisc/statusmessage.cpp

@@ -33,16 +33,17 @@ namespace BlackMisc
         : m_severity(severity), m_message(message), m_timestamp(QDateTime::currentDateTimeUtc())
     {}
 
-    CStatusMessage::CStatusMessage(const QString &category, StatusSeverity severity, const QString &message)
-        : m_category(category), m_severity(severity), m_message(message), m_timestamp(QDateTime::currentDateTimeUtc())
+    CStatusMessage::CStatusMessage(const CLogCategoryList &categories, StatusSeverity severity, const QString &message)
+        : m_categories(categories), m_severity(severity), m_message(message), m_timestamp(QDateTime::currentDateTimeUtc())
     {}
 
     CStatusMessage::CStatusMessage(QtMsgType type, const QMessageLogContext &context, const QString &message)
-        : CStatusMessage(context.category, SeverityInfo, message)
+        : CStatusMessage(message)
     {
-        m_redundant = CLogMessageHelper::hasRedundantFlag(m_category);
-        bool debug = CLogMessageHelper::hasDebugFlag(m_category);
-        m_category = CLogMessageHelper::stripFlags(m_category);
+        m_redundant = CLogMessageHelper::hasRedundantFlag(context.category);
+        bool debug = CLogMessageHelper::hasDebugFlag(context.category);
+        auto categories = CLogMessageHelper::stripFlags(context.category);
+        m_categories = CLogCategoryList::fromQString(categories);
 
         switch(type)
         {
@@ -85,7 +86,7 @@ namespace BlackMisc
      */
     void CStatusMessage::toQtLogTriple(QtMsgType *o_type, QString *o_category, QString *o_message) const
     {
-        QString category = m_category;
+        auto category = m_categories.toQString();
         if (this->m_severity == SeverityDebug && ! category.isEmpty())
         {
             category = CLogMessageHelper::addDebugFlag(category);
@@ -133,7 +134,7 @@ namespace BlackMisc
     {
 
         QString s("Category: ");
-        s.append(this->m_category);
+        s.append(this->m_categories.toQString());
 
         s.append(" Severity: ");
         s.append(QString::number(this->m_severity));
@@ -212,7 +213,7 @@ namespace BlackMisc
                 return this->m_timestamp.toString("HH:mm::ss.zzz");
             }
         case IndexCategory:
-            return QVariant(this->m_category);
+            return QVariant(this->m_categories.toQString());
         default:
             break;
         }
@@ -245,7 +246,7 @@ namespace BlackMisc
             this->m_severity = static_cast<StatusSeverity>(variant.value<uint>());
             break;
         case IndexCategory:
-            this->m_category = variant.value<QString>();
+            this->m_categories = variant.value<CLogCategoryList>();
             break;
         default:
             CValueObject::setPropertyByIndex(variant, index);

src/blackmisc/statusmessage.h

@@ -14,6 +14,7 @@
 
 #include "icon.h"
 #include "propertyindex.h"
+#include "logcategorylist.h"
 #include <QDateTime>
 
 namespace BlackMisc
@@ -55,7 +56,7 @@ namespace BlackMisc
         CStatusMessage(StatusSeverity severity, const QString &message);
 
         //! Constructor
-        CStatusMessage(const QString &category, StatusSeverity severity, const QString &message);
+        CStatusMessage(const CLogCategoryList &categories, StatusSeverity severity, const QString &message);
 
         //! Construct from a Qt logging triple
         //! \sa QtMessageHandler
@@ -72,7 +73,7 @@ namespace BlackMisc
         bool operator !=(const CStatusMessage &other) const;
 
         //! Message category
-        QString getCategory() const { return this->m_category; }
+        const CLogCategoryList &getCategories() const { return this->m_categories; }
 
         //! Message severity
         StatusSeverity getSeverity() const { return this->m_severity; }
@@ -119,7 +120,7 @@ namespace BlackMisc
 
     private:
         BLACK_ENABLE_TUPLE_CONVERSION(CStatusMessage)
-        QString m_category;
+        CLogCategoryList m_categories;
         StatusSeverity m_severity;
         QString m_message;
         QDateTime m_timestamp;
@@ -130,7 +131,7 @@ namespace BlackMisc
 
 
 BLACK_DECLARE_TUPLE_CONVERSION(BlackMisc::CStatusMessage, (
-    o.m_category,
+    o.m_categories,
     o.m_severity,
     o.m_message,
     o.m_timestamp,

src/blackmisc/statusmessagelist.cpp

@@ -22,9 +22,9 @@ namespace BlackMisc
     /*
      * Messages by type
      */
-    CStatusMessageList CStatusMessageList::findByCategory(const QString &category) const
+    CStatusMessageList CStatusMessageList::findByCategory(const CLogCategory &category) const
     {
-        return this->findBy(&CStatusMessage::getCategory, category);
+        return this->findBy([ & ](const CStatusMessage &msg) { return msg.getCategories().contains(category); });
     }
 
     /*

src/blackmisc/statusmessagelist.h

@@ -33,7 +33,7 @@ namespace BlackMisc
         CStatusMessageList(const CSequence<CStatusMessage> &other);
 
         //! Find by type
-        CStatusMessageList findByCategory(const QString &category) const;
+        CStatusMessageList findByCategory(const CLogCategory &category) const;
 
         //! Find by severity
         CStatusMessageList findBySeverity(CStatusMessage::StatusSeverity severity) const;