/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2011 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::codedFixedValueFvPatchField

Description
    Constructs on-the-fly a new boundary condition (derived from
    fixedValueFvPatchField) which is then used to evaluate.

    Example:
    \verbatim
        movingWall
        {
            type            codedFixedValue;
            value           uniform 0;
            redirectType    rampedFixedValue;   // name of generated bc

            code
            #{
                operator==(min(10, 0.1*this->db().time().value()));
            #};

            //codeInclude
            //#{
            //    #include "fvCFD.H"
            //#};

            //codeOptions
            //#{
            //    -I$(LIB_SRC)/finiteVolume/lnInclude
            //#};
        }
    \endverbatim

    A special form is if the 'code' section is not supplied. In this case
    the code gets read from a (runTimeModifiable!) dictionary system/codeDict
    which would have a corresponding entry

    \verbatim
    rampedFixedValue
    {
        code
        #{
            operator==(min(10, 0.1*this->db().time().value()));
        #};
    }
    \endverbatim

SeeAlso
    Foam::dynamicCode and Foam::functionEntries::codeStream

SourceFiles
    codedFixedValueFvPatchField.C

\*---------------------------------------------------------------------------*/

#ifndef codedFixedValueFvPatchField_H
#define codedFixedValueFvPatchField_H

#include "fixedValueFvPatchFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// Forward declaration of classes
class dynamicCode;
class dynamicCodeContext;
class IOdictionary;

/*---------------------------------------------------------------------------*\
                     Class codedFixedValueFvPatch Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class codedFixedValueFvPatchField
:
    public fixedValueFvPatchField<Type>
{
    // Private data

        //- Dictionary contents for the boundary condition
        mutable dictionary dict_;

        const word redirectType_;

        //- Previously loaded library
        mutable fileName oldLibPath_;

        mutable autoPtr<fvPatchField<Type> > redirectPatchFieldPtr_;


    // Private Member Functions

        const IOdictionary& dict() const;

        //- Global loader/unloader function type
        typedef void (*loaderFunctionType)(bool);

        //- Load specified library and execute globalFuncName(true)
        static void* loadLibrary
        (
            const fileName& libPath,
            const string& globalFuncName,
            const dictionary& contextDict
        );

        //- Execute globalFuncName(false) and unload specified library
        static void unloadLibrary
        (
            const fileName& libPath,
            const string& globalFuncName,
            const dictionary& contextDict
        );

        //- Set the rewrite vars controlling the Type
        static void setFieldTemplates(dynamicCode& dynCode);

        //- Create library based on the dynamicCodeContext
        void createLibrary(dynamicCode&, const dynamicCodeContext&) const;

        //- Update library as required
        void updateLibrary() const;


public:

    // Static data members

        //- Name of the C code template to be used
        static const word codeTemplateC;

        //- Name of the H code template to be used
        static const word codeTemplateH;


    //- Runtime type information
    TypeName("codedFixedValue");


    // Constructors

        //- Construct from patch and internal field
        codedFixedValueFvPatchField
        (
            const fvPatch&,
            const DimensionedField<Type, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        codedFixedValueFvPatchField
        (
            const fvPatch&,
            const DimensionedField<Type, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given codedFixedValueFvPatchField
        //  onto a new patch
        codedFixedValueFvPatchField
        (
            const codedFixedValueFvPatchField<Type>&,
            const fvPatch&,
            const DimensionedField<Type, volMesh>&,
            const fvPatchFieldMapper&
        );

        //- Construct as copy
        codedFixedValueFvPatchField
        (
            const codedFixedValueFvPatchField<Type>&
        );

        //- Construct and return a clone
        virtual tmp<fvPatchField<Type> > clone() const
        {
            return tmp<fvPatchField<Type> >
            (
                new codedFixedValueFvPatchField<Type>(*this)
            );
        }

        //- Construct as copy setting internal field reference
        codedFixedValueFvPatchField
        (
            const codedFixedValueFvPatchField<Type>&,
            const DimensionedField<Type, volMesh>&
        );

        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchField<Type> > clone
        (
            const DimensionedField<Type, volMesh>& iF
        ) const
        {
            return tmp<fvPatchField<Type> >
            (
                new codedFixedValueFvPatchField<Type>(*this, iF)
            );
        }




    // Member functions

        //- Get reference to the underlying patch
        const fvPatchField<Type>& redirectPatchField() const;

        //- Update the coefficients associated with the patch field
        virtual void updateCoeffs();

        //- Evaluate the patch field, sets Updated to false
        virtual void evaluate
        (
            const Pstream::commsTypes commsType=Pstream::blocking
        );

        //- Write
        virtual void write(Ostream&) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#ifdef NoRepository
#   include "codedFixedValueFvPatchField.C"
#endif

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //