refs #189 , PQ string class which allows parsing strings like 100m/s.

pqbase contains template method to determine a valid unit.

src/blackmisc/pqstring.h

@@ -0,0 +1,103 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  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/. */
+
+#ifndef BLACKMISC_PQSTRING_H
+#define BLACKMISC_PQSTRING_H
+
+#include "blackmisc/valueobject.h"
+#include <QVariant>
+
+namespace BlackMisc
+{
+    namespace PhysicalQuantities
+    {
+
+        /*!
+         * \brief Represents a physical quantity by a string
+         * \details Used to parse strings into physical quantities, validate strings
+         * \sa BlackMisc::PhysicalQuantity
+         */
+        class CPqString : public BlackMisc::CValueObject
+        {
+        public:
+
+        private:
+            BLACK_ENABLE_TUPLE_CONVERSION(CPqString)
+            QString m_string;
+
+        protected:
+            //! \copydoc CValueObject::convertToQString
+            virtual QString convertToQString(bool i18n = false) const override;
+
+            //! \copydoc CValueObject::marshallFromDbus()
+            virtual void marshallToDbus(QDBusArgument &argument) const override;
+
+            //! \copydoc CValueObject::unmarshallFromDbus()
+            virtual void unmarshallFromDbus(const QDBusArgument &argument) override;
+
+            //! \copydoc CValueObject::compareImpl
+            virtual int compareImpl(const CValueObject &other) const override;
+
+            //! \copydoc CValueObject::isA
+            virtual bool isA(int metaTypeId) const override;
+
+        public:
+            //! \brief Default constructor
+            CPqString() {}
+
+            /*!
+             * \brief Constructor
+             * \param value such as 10km/h
+             */
+            CPqString(const QString &value) : m_string(value) {}
+
+            //! \copydoc CValueObject::toQVariant
+            virtual QVariant toQVariant() const override
+            {
+                return QVariant::fromValue(*this);
+            }
+
+            //! \copydoc CValueObject::getMetaTypeId
+            int getMetaTypeId() const
+            {
+                return qMetaTypeId<CPqString>();
+            }
+
+            //! \copydoc CValueObject::getValueHash
+            virtual uint getValueHash() const override;
+
+            //! \brief Equal operator ==
+            bool operator ==(const CPqString &other) const;
+
+            //! \brief Unequal operator !=
+            bool operator !=(const CPqString &other) const;
+
+            //! \brief Register metadata
+            static void registerMetadata();
+
+            //! \brief parse a string value like "100m", "10.3Mhz"
+            static QVariant parse(const QString &value);
+
+            //! \brief parse into concrete type
+            template <class PQ> static const PQ parse(const QString &symbol)
+            {
+                PQ invalid;
+                if (symbol.isEmpty()) return invalid;
+                QVariant qv = CPqString::parse(symbol);
+                if (!qv.isNull() && qv.canConvert<PQ>())
+                {
+                    return qv.value<PQ>();
+                }
+                return invalid;
+            }
+        };
+
+    } // namespace
+} // namespace
+
+BLACK_DECLARE_TUPLE_CONVERSION(BlackMisc::PhysicalQuantities::CPqString, (o.m_string))
+Q_DECLARE_METATYPE(BlackMisc::PhysicalQuantities::CPqString)
+
+#endif // guard