Fields can now be cleared

messagingclient/main.cpp

@@ -13,6 +13,10 @@ int main(int argc, char **argv)
     message.copyTo(map);
     qDebug() << "full" << map;
 
+
+
+    qDebug() << "changing name...";
+
     message.setName("Peter");
 
     map.clear();
@@ -23,9 +27,15 @@ int main(int argc, char **argv)
     message.copyTouchedTo(map);
     qDebug() << "delta:" << map;
 
-    qDebug() << "clearing touched...";
 
-    message.setTouched(false);
+
+    qDebug() << "clearing name...";
+
+    message.nameField().clear();
+
+    map.clear();
+    message.copyTo(map);
+    qDebug() << "full" << map;
 
     map.clear();
     message.copyTouchedTo(map);

messagingcorelib/dbmsglib.cpp

@@ -7,7 +7,7 @@
 #include <algorithm>
 
 DbMsgFieldBase::DbMsgFieldBase() :
-    m_touched(false)
+    m_hasValue(false), m_touched(false)
 {
 }
 
@@ -15,6 +15,16 @@ DbMsgFieldBase::~DbMsgFieldBase()
 {
 }
 
+bool DbMsgFieldBase::hasValue() const
+{
+    return m_hasValue;
+}
+
+void DbMsgFieldBase::clear()
+{
+    m_hasValue = false;
+}
+
 bool DbMsgFieldBase::touched() const
 {
     return m_touched;
@@ -25,6 +35,16 @@ void DbMsgFieldBase::setTouched(bool touched)
     m_touched = touched;
 }
 
+void DbMsgFieldBase::setHasValue(bool hasValue)
+{
+    if(m_hasValue && !hasValue)
+        clear();
+    else
+        m_hasValue = hasValue;
+}
+
+const QString DbMsgBase::m_clearedFieldsName(QStringLiteral("__CLEARED_FIELDS"));
+
 DbMsgBase::DbMsgBase()
 {
 }
@@ -62,7 +82,16 @@ void DbMsgBase::copyTo(QVariantMap &variantMap) const
 {
     const auto fields = getFields();
     for(auto iter = fields.cbegin(); iter != fields.cend(); iter++)
-        variantMap.insert(iter.key(), iter.value()->getVariant());
+    {
+        const auto key = iter.key();
+        const auto field = iter.value();
+        const auto hasValue = field->hasValue();
+        const auto variant = field->getVariant();
+        if(hasValue)
+            variantMap.insert(key, variant);
+        else
+            qWarning() << key << "has no value for full transmission!";
+    }
 }
 
 void DbMsgBase::copyTouchedTo(QJsonObject &jsonObject) const
@@ -73,8 +102,18 @@ void DbMsgBase::copyTouchedTo(QJsonObject &jsonObject) const
 
 void DbMsgBase::copyTouchedTo(QVariantMap &variantMap) const
 {
+    QStringList clearedFields;
+
     const auto fields = getFields();
     for(auto iter = fields.cbegin(); iter != fields.cend(); iter++)
         if(iter.value()->touched())
-            variantMap.insert(iter.key(), iter.value()->getVariant());
+        {
+            if(iter.value()->hasValue())
+                variantMap.insert(iter.key(), iter.value()->getVariant());
+            else
+                clearedFields.append(iter.key());
+        }
+
+    if(!clearedFields.isEmpty())
+        variantMap.insert(m_clearedFieldsName, clearedFields);
 }

messagingcorelib/dbmsglib.h

@@ -12,12 +12,19 @@ public:
     DbMsgFieldBase();
     virtual ~DbMsgFieldBase();
 
+    bool hasValue() const;
+    virtual void clear();
+
     bool touched() const;
     void setTouched(bool touched);
 
     virtual QVariant getVariant() const = 0;
 
+protected:
+    void setHasValue(bool hasValue);
+
 private:
+    bool m_hasValue;
     bool m_touched;
 };
 
@@ -32,27 +39,25 @@ public:
     const T &getValue() const;
     void setValue(const T &value);
 
-    bool hasValue() const;
-
-    QVariant getVariant() const;
+    void clear() override;
+    QVariant getVariant() const override;
 
 private:
     T m_value;
-    bool m_hasValue;
 };
 
 template<typename T>
 DbMsgField<T>::DbMsgField() :
-    DbMsgFieldBase(),
-    m_hasValue(false)
+    DbMsgFieldBase()
 {
 }
 
 template<typename T>
 DbMsgField<T>::DbMsgField(const T &value) :
     DbMsgFieldBase(),
-    m_value(value), m_hasValue(true)
+    m_value(value)
 {
+    setHasValue(true);
 }
 
 template<typename T>
@@ -70,15 +75,16 @@ const T &DbMsgField<T>::getValue() const
 template<typename T>
 void DbMsgField<T>::setValue(const T &value)
 {
-    m_hasValue = true;
     m_value = value;
+    setHasValue(true);
     setTouched(true);
 }
 
 template<typename T>
-bool DbMsgField<T>::hasValue() const
+void DbMsgField<T>::clear()
 {
-    return m_hasValue;
+    DbMsgFieldBase::clear();
+    m_value = T();
 }
 
 template<typename T>
@@ -89,6 +95,8 @@ QVariant DbMsgField<T>::getVariant() const
 
 class DbMsgBase
 {
+    static const QString m_clearedFieldsName;
+
 public:
     DbMsgBase();
     virtual ~DbMsgBase();