AppEnum: Move QTextStream operator to avoid include of QTextStream

Include file profiling shows that include of QTextStream is a performance issue. Create a non-templated base class for AppEnum. Implement the QTextStream operator for this interface.

Fwk/AppFwk/cafProjectDataModel/cafPdmCore/cafAppEnum.h

@@ -40,7 +40,6 @@
 
 #include <QString>
 #include <QStringList>
-#include <QTextStream>
 
 #include <vector>
 
@@ -98,8 +97,18 @@ namespace caf
 ///     }
 //==================================================================================================
 
+class AppEnumInterface
+{
+    // This non-templated base class is used in cafInternalPdmStreamOperators.h to create a QTextStream operator. Having
+    // the QTextStream operator working on each templated type was seen as a performance issue when profiling use of
+    // include files
+public:
+    virtual QString textForSerialization() const                   = 0;
+    virtual void    setTextForSerialization( const QString& text ) = 0;
+};
+
 template <class T>
-class AppEnum
+class AppEnum : public AppEnumInterface
 {
 public:
     AppEnum() { m_value = EnumMapper::instance()->defaultValue(); }
@@ -123,6 +132,9 @@ class AppEnum
     bool setFromText( const QString& text ) { return EnumMapper::instance()->enumVal( m_value, text ); }
     bool setFromIndex( size_t index ) { return EnumMapper::instance()->enumVal( m_value, index ); }
 
+    QString textForSerialization() const override { return text(); }
+    void    setTextForSerialization( const QString& text ) override { setFromText( text ); }
+
     // Static interface to access the properties of the enum definition
 
     static bool   isValid( const QString& text ) { return EnumMapper::instance()->isValid( text ); }
@@ -343,29 +355,3 @@ class AppEnum
 };
 
 } // namespace caf
-
-//==================================================================================================
-/// Implementation of stream operators to make PdmField<AppEnum<> > work smoothly
-/// Assumes that the stream ends at the end of the enum text
-//==================================================================================================
-
-template <typename T>
-QTextStream& operator>>( QTextStream& str, caf::AppEnum<T>& appEnum )
-{
-    QString text;
-    str >> text;
-
-    // Make sure the text parsed from a text stream is trimmed
-    // https://github.com/OPM/ResInsight/issues/7829
-    appEnum.setFromText( text.trimmed() );
-
-    return str;
-}
-
-template <typename T>
-QTextStream& operator<<( QTextStream& str, const caf::AppEnum<T>& appEnum )
-{
-    str << appEnum.text();
-
-    return str;
-}

Fwk/AppFwk/cafProjectDataModel/cafPdmXml/cafInternalPdmStreamOperators.cpp

@@ -1,6 +1,8 @@
 #include <QString>
 #include <QTextStream>
 
+#include "cafAppEnum.h"
+
 //--------------------------------------------------------------------------------------------------
 /// Specialized read operation for Bool`s
 //--------------------------------------------------------------------------------------------------
@@ -83,3 +85,21 @@ QTextStream& operator<<( QTextStream& str, const QTime& value )
     str << text;
     return str;
 }
+
+//--------------------------------------------------------------------------------------------------
+/// Specialized read operation for AppEnum
+//--------------------------------------------------------------------------------------------------
+QTextStream& operator>>( QTextStream& str, caf::AppEnumInterface& value )
+{
+    QString text;
+    str >> text;
+    value.setTextForSerialization( text );
+    return str;
+}
+
+QTextStream& operator<<( QTextStream& str, const caf::AppEnumInterface& value )
+{
+    QString text = value.textForSerialization();
+    str << text;
+    return str;
+}

Fwk/AppFwk/cafProjectDataModel/cafPdmXml/cafInternalPdmStreamOperators.h

@@ -1,7 +1,5 @@
 #pragma once
 
-#include <QTextStream>
-
 //==================================================================================================
 /// QTextStream Stream operator overloading for bool`s
 /// Prints bool`s as "True"/"False", and reads them too
@@ -34,6 +32,15 @@ QTextStream& operator<<( QTextStream& str, const QDate& value );
 QTextStream& operator>>( QTextStream& str, QTime& value );
 QTextStream& operator<<( QTextStream& str, const QTime& value );
 
+// AppEnum
+namespace caf
+{
+class AppEnumInterface;
+}
+
+QTextStream& operator>>( QTextStream& str, caf::AppEnumInterface& value );
+QTextStream& operator<<( QTextStream& str, const caf::AppEnumInterface& value );
+
 //==================================================================================================
 /// QTextStream Stream operator overloading for std::vector of things.
 /// Makes automated IO of PdmField< std::vector< Whatever > possible as long as