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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 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/>.

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

#include "ReadFields.H"
#include <OpenFOAM/HashSet.H>
#include <OpenFOAM/Pstream.H>
#include <OpenFOAM/IOobjectList.H>

// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //

// Read all fields of type. Returns names of fields read. Guarantees all
// processors to read fields in same order.
template<class GeoField, class Mesh>
Foam::wordList Foam::ReadFields
(
    const Mesh& mesh,
    const IOobjectList& objects,
    PtrList<GeoField>& fields,
    const bool syncPar
)
{
    // Search list of objects for wanted type
    IOobjectList fieldObjects(objects.lookupClass(GeoField::typeName));

    wordList masterNames(fieldObjects.names());

    if (syncPar && Pstream::parRun())
    {
        // Check that I have the same fields as the master
        const wordList localNames(masterNames);
        Pstream::scatter(masterNames);

        HashSet<word> localNamesSet(localNames);

        forAll(masterNames, i)
        {
            const word& masterFld = masterNames[i];

            HashSet<word>::iterator iter = localNamesSet.find(masterFld);

            if (iter == localNamesSet.end())
            {
                FatalErrorIn
                (
                    "ReadFields<class GeoField, class Mesh>"
                    "(const Mesh&, const IOobjectList&, PtrList<GeoField>&"
                    ", const bool)"
                )   << "Fields not synchronised across processors." << endl
                    << "Master has fields " << masterNames
                    << "  processor " << Pstream::myProcNo()
                    << " has fields " << localNames << exit(FatalError);
            }
            else
            {
                localNamesSet.erase(iter);
            }
        }

        forAllConstIter(HashSet<word>, localNamesSet, iter)
        {
            FatalErrorIn
            (
                "ReadFields<class GeoField, class Mesh>"
                "(const Mesh&, const IOobjectList&, PtrList<GeoField>&"
                ", const bool)"
            )   << "Fields not synchronised across processors." << endl
                << "Master has fields " << masterNames
                << "  processor " << Pstream::myProcNo()
                << " has fields " << localNames << exit(FatalError);
        }
    }


    fields.setSize(masterNames.size());

    // Make sure to read in masterNames order.

    forAll(masterNames, i)
    {
        Info<< "Reading " << GeoField::typeName << ' ' << masterNames[i]
            << endl;

        const IOobject& io = *fieldObjects[masterNames[i]];

        fields.set
        (
            i,
            new GeoField
            (
                IOobject
                (
                    io.name(),
                    io.instance(),
                    io.local(),
                    io.db(),
                    IOobject::MUST_READ,
                    IOobject::AUTO_WRITE,
                    io.registerObject()
                ),
                mesh
            )
        );
    }
    return masterNames;    
}


// ************************ vim: set sw=4 sts=4 et: ************************ //