ENH: forces FO updated following update to use functionObjectState

Properties stored in state dictionary:
- normalForce
- tangentialForce
- porousForce
- normalMoment
- tangentialMoment
- porousMoment

src/postProcessing/functionObjects/forces/forces/forces.C

@@ -743,10 +743,9 @@ Foam::forces::forces
     const bool readFields
 )
 :
+    functionObjectState(obr, name),
     functionObjectFile(obr, name),
-    name_(name),
     obr_(obr),
-    active_(true),
     log_(true),
     force_(3),
     moment_(3),
@@ -779,29 +778,14 @@ Foam::forces::forces
     initialised_(false)
 {
     // Check if the available mesh is an fvMesh otherise deactivate
-    if (isA<fvMesh>(obr_))
+    if (setActive<fvMesh>())
     {
         if (readFields)
         {
             read(dict);
-            Info<< endl;
+            if (log_) Info << endl;
         }
     }
-    else
-    {
-        active_ = false;
-        WarningIn
-        (
-            "Foam::forces::forces"
-            "("
-                "const word&, "
-                "const objectRegistry&, "
-                "const dictionary&, "
-                "const bool"
-            ")"
-        )   << "No fvMesh available, deactivating " << name_
-            << endl;
-    }
 }
 
 
@@ -818,9 +802,9 @@ Foam::forces::forces
     const coordinateSystem& coordSys
 )
 :
+    functionObjectState(obr, name),
     functionObjectFile(obr, name),
     obr_(obr),
-    active_(true),
     log_(true),
     force_(3),
     moment_(3),
@@ -1040,6 +1024,14 @@ void Foam::forces::execute()
         if (log_) Info << endl;
     }
 
+    // write state/results information
+    setResult("normalForce", sum(force_[0]));
+    setResult("tangentialForce", sum(force_[1]));
+    setResult("porousForce", sum(force_[2]));
+
+    setResult("normalMoment", sum(moment_[0]));
+    setResult("tangentialMoment", sum(moment_[1]));
+    setResult("porousMoment", sum(moment_[2]));
 }
 
 

src/postProcessing/functionObjects/forces/forces/forces.H

@@ -117,6 +117,7 @@ Note
 SeeAlso
     Foam::functionObject
     Foam::functionObjectFile
+    Foam::functionObjectState
     Foam::OutputFilterFunctionObject
     Foam::forceCoeffs
 
@@ -129,6 +130,7 @@ SourceFiles
 #ifndef forces_H
 #define forces_H
 
+#include "functionObjectState.H"
 #include "functionObjectFile.H"
 #include "coordinateSystem.H"
 #include "coordinateSystems.H"
@@ -156,21 +158,16 @@ class mapPolyMesh;
 
 class forces
 :
+    public functionObjectState,
     public functionObjectFile
 {
 protected:
 
     // Protected data
 
-        //- Name of this set of forces,
-        //  Also used as the name of the probes directory.
-        word name_;
-
+        //- Reference to the database
         const objectRegistry& obr_;
 
-        //- On/off switch
-        bool active_;
-
         //- Switch to send output to Info as well as to file
         Switch log_;