/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2012 OpenFOAM Foundation
     \\/     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::pointEdgeCollapse

Description
    Determines length of string of edges walked to point.

SourceFiles
    pointEdgeCollapseI.H
    pointEdgeCollapse.C

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

#ifndef pointEdgeCollapse_H
#define pointEdgeCollapse_H

#include "point.H"
#include "tensor.H"

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

namespace Foam
{

// Forward declaration of classes
class polyPatch;
class polyMesh;

/*---------------------------------------------------------------------------*\
                           Class pointEdgeCollapse Declaration
\*---------------------------------------------------------------------------*/

class pointEdgeCollapse
{
    // Private data

        //- Collapse location
        point collapsePoint_;

        //- Collapse string index
        label collapseIndex_;


    // Private Member Functions

        //- Evaluate distance to point.
        template<class TrackingData>
        inline bool update
        (
            const pointEdgeCollapse& w2,
            const scalar tol,
            TrackingData& td
        );


        //- Check for same coordinate
        inline bool samePoint(const point& pt) const;

public:

    // Constructors

        //- Construct null
        inline pointEdgeCollapse();

        //- Construct from components
        inline pointEdgeCollapse
        (
            const point& collapsePoint,
            const label collapseIndex
        );


    // Member Functions

        // Access

            inline const point& collapsePoint() const;

            inline label collapseIndex() const;


        // Needed by meshWave

            //- Check whether origin has been changed at all or
            //  still contains original (invalid) value.
            template<class TrackingData>
            inline bool valid(TrackingData& td) const;

            //- Convert origin to relative vector to leaving point
            //  (= point coordinate)
            template<class TrackingData>
            inline void leaveDomain
            (
                const polyPatch& patch,
                const label patchPointI,
                const point& pos,
                TrackingData& td
            );

            //- Convert relative origin to absolute by adding entering point
            template<class TrackingData>
            inline void enterDomain
            (
                const polyPatch& patch,
                const label patchPointI,
                const point& pos,
                TrackingData& td
            );

            //- Apply rotation matrix to origin
            template<class TrackingData>
            inline void transform
            (
                const tensor& rotTensor,
                TrackingData& td
            );

            //- Influence of edge on point
            template<class TrackingData>
            inline bool updatePoint
            (
                const polyMesh& mesh,
                const label pointI,
                const label edgeI,
                const pointEdgeCollapse& edgeInfo,
                const scalar tol,
                TrackingData& td
            );

            //- Influence of different value on same point.
            //  Merge new and old info.
            template<class TrackingData>
            inline bool updatePoint
            (
                const polyMesh& mesh,
                const label pointI,
                const pointEdgeCollapse& newPointInfo,
                const scalar tol,
                TrackingData& td
            );

            //- Influence of different value on same point.
            //  No information about current position whatsoever.
            template<class TrackingData>
            inline bool updatePoint
            (
                const pointEdgeCollapse& newPointInfo,
                const scalar tol,
                TrackingData& td
            );

            //- Influence of point on edge.
            template<class TrackingData>
            inline bool updateEdge
            (
                const polyMesh& mesh,
                const label edgeI,
                const label pointI,
                const pointEdgeCollapse& pointInfo,
                const scalar tol,
                TrackingData& td
            );

            //- Same (like operator==)
            template<class TrackingData>
            inline bool equal(const pointEdgeCollapse&, TrackingData&)
            const;


    // Member Operators

        //Note: Used to determine whether to call update.
        inline bool operator==(const pointEdgeCollapse&) const;
        inline bool operator!=(const pointEdgeCollapse&) const;


    // IOstream Operators

        friend Ostream& operator<<(Ostream&, const pointEdgeCollapse&);
        friend Istream& operator>>(Istream&, pointEdgeCollapse&);
};


//- Data associated with pointEdgeCollapse type are contiguous
template<>
inline bool contiguous<pointEdgeCollapse>()
{
    return true;
}


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

} // End namespace Foam

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

#include "pointEdgeCollapseI.H"

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

#endif

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