pointPatchField.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2019-2025 OpenCFD Ltd.
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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.

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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    You should have received a copy of the GNU General Public License
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Class
    Foam::pointPatchField

Description
    Abstract base class for point-mesh patch fields.

    The base-field does not store values as they are part of the
    "internal field".  There are derived classes to store constraint values
    e.g. fixedValuePointPatchField derived from the generic
    valuePointPatchField which ensures the values in the "internal field"
    are reset to the fixed-values by applying the stored values.

SourceFiles
    pointPatchField.C
    pointPatchFieldNew.C

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

#ifndef Foam_pointPatchField_H
#define Foam_pointPatchField_H

#include "pointPatch.H"
#include "DimensionedField.H"
#include "fieldTypes.H"
#include "autoPtr.H"

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

namespace Foam
{

// Forward Declarations
class dictionary;
class objectRegistry;
class pointPatchFieldMapper;
class pointMesh;

template<class Type> class pointPatchField;
template<class Type> class calculatedPointPatchField;

template<class Type>
Ostream& operator<<(Ostream&, const pointPatchField<Type>&);

/*---------------------------------------------------------------------------*\
                     Class pointPatchFieldBase Declaration
\*---------------------------------------------------------------------------*/

//- Template invariant parts for pointPatchField
class pointPatchFieldBase
{
    // Private Data

        //- Reference to patch
        const pointPatch& patch_;

        //- Update index used so that updateCoeffs is called only once during
        //- the construction of the matrix
        bool updated_;

        //- Optional patch type
        //  Used to allow specified boundary conditions to be applied
        //  to constraint patches by providing the constraint
        //  patch type as 'patchType'
        word patchType_;


protected:

    // Protected Member Functions

        //- Read dictionary entries.
        //  Useful when initially constructed without a dictionary
        virtual void readDict(const dictionary& dict);


public:

    //- Debug switch to disallow the use of generic pointPatchField
    static int disallowGenericPatchField;

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


    // Constructors

        //- Construct from patch
        explicit pointPatchFieldBase(const pointPatch& p);

        //- Construct from patch and patch type
        pointPatchFieldBase(const pointPatch& p, const word& patchType);

        //- Construct from patch and dictionary
        pointPatchFieldBase(const pointPatch& p, const dictionary& dict);

        //- Copy construct with new patch
        pointPatchFieldBase(const pointPatchFieldBase&, const pointPatch& p);

        //- Copy construct
        pointPatchFieldBase(const pointPatchFieldBase&);


    //- Destructor
    virtual ~pointPatchFieldBase() = default;


    // Static Member Functions

        //- The type name for \c empty patch fields
        static const word& emptyType() noexcept
        {
            return Foam::fieldTypes::emptyType;
        }

        //- The type name for \c calculated patch fields
        static const word& calculatedType() noexcept
        {
            return Foam::fieldTypes::calculatedType;
        }

        //- The type name for \c zeroGradient patch fields
        static const word& zeroGradientType() noexcept
        {
            return Foam::fieldTypes::zeroGradientType;
        }


    // Member Functions

    // Attributes

        //- True if the value of the patch field is altered by assignment
        virtual bool assignable() const
        {
            return false;
        }

        //- True if the patch field fixes a value
        virtual bool fixesValue() const
        {
            return false;
        }

        //- True if the patch field is coupled
        virtual bool coupled() const
        {
            return false;
        }

        //- The constraint type the pointPatchField implements
        virtual const word& constraintType() const
        {
            return word::null;
        }


    // Access

        //- The associated objectRegistry
        const objectRegistry& db() const;

        //- Return the patch
        const pointPatch& patch() const noexcept
        {
            return patch_;
        }

        //- The optional patch type
        const word& patchType() const noexcept
        {
            return patchType_;
        }

        //- The optional patch type
        word& patchType() noexcept
        {
            return patchType_;
        }

        //- True if the type does not correspond to the constraint type
        virtual bool constraintOverride() const
        {
            return !patchType_.empty() && patchType_ != type();
        }


    // Solution

        //- True if the boundary condition has already been updated
        bool updated() const noexcept
        {
            return updated_;
        }

        //- Set updated state
        void setUpdated(bool state) noexcept
        {
            updated_ = state;
        }

        //- True if the matrix has already been manipulated.
        //- Currently always false for pointPatchField
        bool manipulatedMatrix() const noexcept
        {
            return false;
        }

        //- Set matrix manipulated state.
        //- Currently a no-op for pointPatchField.
        void setManipulated(bool state) noexcept
        {}


    // Check

        //- Check that patches are identical
        void checkPatch(const pointPatchFieldBase& rhs) const;
};


/*---------------------------------------------------------------------------*\
                       Class pointPatchField Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class pointPatchField
:
    public pointPatchFieldBase
{
public:

    // Public Data Types

        //- The patch type for the patch field
        typedef pointPatch Patch;

        //- The value_type for the patch field
        typedef Type value_type;

        //- The component type for patch field
        typedef typename pTraits<Type>::cmptType cmptType;

        //- The internal field type associated with the patch field
        typedef DimensionedField<Type, pointMesh> Internal;

        //- Type for a \em calculated patch
        typedef calculatedPointPatchField<Type> Calculated;


private:

    // Private Data

        //- Reference to internal field
        const DimensionedField<Type, pointMesh>& internalField_;


public:

    // Declare run-time constructor selection tables

        declareRunTimeSelectionTable
        (
            autoPtr,
            pointPatchField,
            patch,
            (
                const pointPatch& p,
                const DimensionedField<Type, pointMesh>& iF
            ),
            (p, iF)
        );

        declareRunTimeSelectionTable
        (
            autoPtr,
            pointPatchField,
            patchMapper,
            (
                const pointPatchField<Type>& ptf,
                const pointPatch& p,
                const DimensionedField<Type, pointMesh>& iF,
                const pointPatchFieldMapper& m
            ),
            (dynamic_cast<const pointPatchFieldType&>(ptf), p, iF, m)
        );

        declareRunTimeSelectionTable
        (
            autoPtr,
            pointPatchField,
            dictionary,
            (
                const pointPatch& p,
                const DimensionedField<Type, pointMesh>& iF,
                const dictionary& dict
            ),
            (p, iF, dict)
        );


    // Constructors

        //- Construct from patch and internal field
        pointPatchField
        (
            const pointPatch&,
            const DimensionedField<Type, pointMesh>&
        );

        //- Construct from patch, internal field and dictionary
        pointPatchField
        (
            const pointPatch&,
            const DimensionedField<Type, pointMesh>&,
            const dictionary&
        );

        //- Construct by mapping given patch field onto a new patch
        pointPatchField
        (
            const pointPatchField<Type>&,
            const pointPatch&,
            const DimensionedField<Type, pointMesh>&,
            const pointPatchFieldMapper&
        );

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

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

        //- Clone patch field with its own internal field reference
        virtual autoPtr<pointPatchField<Type>> clone() const = 0;

        //- Clone patch field with an internal field reference
        virtual autoPtr<pointPatchField<Type>> clone
        (
            const DimensionedField<Type, pointMesh>& iF
        ) const = 0;


    // Factory Methods

        //- Clone a patch field, optionally with internal field reference etc.
        template<class DerivedPatchField, class... Args>
        static autoPtr<pointPatchField<Type>> Clone
        (
            const DerivedPatchField& pf,
            Args&&... args
        )
        {
            return autoPtr<pointPatchField<Type>>
            (
                new DerivedPatchField(pf, std::forward<Args>(args)...)
            );
        }

        //- Return a pointer to a new patchField created on freestore given
        //  patch and internal field
        //  (does not set the patch field values)
        static autoPtr<pointPatchField<Type>> New
        (
            const word& patchFieldType,
            const pointPatch& p,
            const DimensionedField<Type, pointMesh>& iF
        );

        //- Return a pointer to a new patchField created on freestore given
        //  patch and internal field
        //  (does not set the patch field values).
        //  Allows override of constraint type
        static autoPtr<pointPatchField<Type>> New
        (
            const word& patchFieldType,
            const word& actualPatchType,
            const pointPatch& p,
            const DimensionedField<Type, pointMesh>& iF
        );

        //- Return a pointer to a new patchField created on freestore from
        //  a given pointPatchField mapped onto a new patch
        static autoPtr<pointPatchField<Type>> New
        (
            const pointPatchField<Type>&,
            const pointPatch&,
            const DimensionedField<Type, pointMesh>&,
            const pointPatchFieldMapper&
        );

        //- Return a pointer to a new patchField created on freestore
        //  from dictionary
        static autoPtr<pointPatchField<Type>> New
        (
            const pointPatch&,
            const DimensionedField<Type, pointMesh>&,
            const dictionary&
        );

        //- Return a pointer to a new calculatedPointPatchField created on
        //  freestore without setting patchField values
        static autoPtr<pointPatchField<Type>>
        NewCalculatedType
        (
            const pointPatch& p
        );

        //- Return a pointer to a new calculatedPointPatchField created on
        //  freestore without setting patchField values
        template<class AnyType>
        static autoPtr<pointPatchField<Type>>
        NewCalculatedType
        (
            const pointPatchField<AnyType>& pf
        );


    //- Destructor
    virtual ~pointPatchField() = default;


    // Member Functions

    // Access

        //- Return the patch size
        label size() const
        {
            return patch().size();
        }

        //- Return const-reference to the dimensioned internal field
        const DimensionedField<Type, pointMesh>& internalField() const noexcept
        {
            return internalField_;
        }

        //- Return const-reference to the internal field values
        const Field<Type>& primitiveField() const noexcept
        {
            return internalField_;
        }


        // Evaluation Functions

            //- Extract field using specified addressing
            // \param internalData The internal field to extract from
            // \param addressing Addressing (mesh-points) into internal field
            // \param [out] pfld The extracted patch field.
            //     Should normally be sized according to the patch size(),
            //     which can be smaller than the addressing size
            template<class Type1>
            void patchInternalField
            (
                const UList<Type1>& internalData,
                const labelUList& addressing,
                UList<Type1>& pfld
            ) const;

            //- Return field created from selected internal field values
            //- given internal field reference
            // \param internalData The internal field to extract from
            // \param addressing Addressing (mesh-points) into internal field
            template<class Type1>
            [[nodiscard]] tmp<Field<Type1>>
            patchInternalField
            (
                const UList<Type1>& internalData,
                const labelUList& addressing
            ) const;

            //- Return field created from appropriate internal field values
            //- given internal field reference
            template<class Type1>
            [[nodiscard]] tmp<Field<Type1>>
            patchInternalField
            (
                const UList<Type1>& internalData
            ) const;

            //- Return field created from appropriate internal field values
            tmp<Field<Type>> patchInternalField() const;


            //- Given the internal field and a patch field,
            //- add the patch field to the internal field
            template<class Type1>
            void addToInternalField
            (
                Field<Type1>& iF,
                const Field<Type1>& pF
            ) const;

            //- Given the internal field and a patch field,
            //- add selected elements of the patch field to the internal field
            template<class Type1>
            void addToInternalField
            (
                Field<Type1>& iF,
                const Field<Type1>& pF,
                const labelUList& points
            ) const;

            //- Given the internal field and a patch field,
            //- set the patch field in the internal field
            template<class Type1>
            void setInInternalField
            (
                Field<Type1>& iF,
                const Field<Type1>& pF,
                const labelUList& meshPoints
            ) const;

            //- Given the internal field and a patch field,
            //- set the patch field in the internal field
            template<class Type1>
            void setInInternalField
            (
                Field<Type1>& iF,
                const Field<Type1>& pF
            ) const;


    // Mapping Functions

        //- Map (and resize as needed) from self given a mapping object
        virtual void autoMap
        (
            const pointPatchFieldMapper&
        )
        {}

        //- Reverse map the given pointPatchField onto this pointPatchField
        virtual void rmap
        (
            const pointPatchField<Type>&,
            const labelList&
        )
        {}


    // Evaluation Functions

        //- Update the coefficients associated with the patch field
        //  Sets Updated to true
        virtual void updateCoeffs();

        //- Initialise evaluation of the patch field (do nothing)
        virtual void initEvaluate
        (
            const Pstream::commsTypes commsType = Pstream::commsTypes::buffered
        )
        {}

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

            //- Initialise the evaluation of the patch field after a local
            //  operation
            virtual void initEvaluateLocal
            (
                const Pstream::commsTypes commsType =
                    Pstream::commsTypes::buffered
            )
            {}

            //- Evaluate the patch field after a local operation (e.g. *=)
            virtual void evaluateLocal
            (
                const Pstream::commsTypes commsType =
                    Pstream::commsTypes::buffered
            )
            {}


    // Other

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


    // Member Operators

        virtual void operator=(const pointPatchField<Type>&){}
        virtual void operator+=(const pointPatchField<Type>&){}
        virtual void operator-=(const pointPatchField<Type>&){}
        virtual void operator*=(const pointPatchField<scalar>&){}
        virtual void operator/=(const pointPatchField<scalar>&){}

        virtual void operator=(const Field<Type>&){}
        virtual void operator+=(const Field<Type>&){}
        virtual void operator-=(const Field<Type>&){}

        virtual void operator*=(const Field<scalar>&){}
        virtual void operator/=(const Field<scalar>&){}

        virtual void operator=(const Type&){}
        virtual void operator+=(const Type&){}
        virtual void operator-=(const Type&){}
        virtual void operator*=(const scalar){}
        virtual void operator/=(const scalar){}


        // Force an assignment irrespective of form of patch
        // By generic these do nothing unless the patch actually has boundary
        // values

        virtual void operator==(const pointPatchField<Type>&) {}
        virtual void operator==(const Field<Type>&) {}
        virtual void operator==(const Type&) {}

        // Prevent automatic comparison rewriting (c++20)
        bool operator!=(const pointPatchField<Type>&) const = delete;
        bool operator!=(const Field<Type>&) const = delete;
        bool operator!=(const Type&) const = delete;


    // Ostream Operator

        friend Ostream& operator<< <Type>
        (
            Ostream&,
            const pointPatchField<Type>&
        );


    // Other Methods

        //- Negate the field inplace. Dummy placeholder for FieldField
        void negate() {}

        //- Normalise the field inplace. Dummy placeholder for FieldField
        void normalise() {}
};


// This function is added as a hack to enable simple backward compatibility
// with versions using referenceLevel in GeometricField
template<class Type>
const pointPatchField<Type>& operator+
(
    const pointPatchField<Type>& ppf,
    const Type&
)
{
    return ppf;
}


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

} // End namespace Foam

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

#include "pointPatchFieldFunctions.H"

#ifdef NoRepository
    #include "pointPatchField.C"
    #include "pointPatchFieldNew.C"
    #include "calculatedPointPatchField.H"
    #include "zeroGradientPointPatchField.H"
#endif

// Runtime selection macros
#include "pointPatchFieldMacros.H"

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

#endif

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