compareFiles.cpp

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/*
 * compareFiles.cpp
 * this tool will take two existing h5m files, for the same mesh;
 *  they will both have the same GLOBAL_IDs for the elements, but the entity handles can be
 *  very different (depending on how the mesh was partitioned, and saved in parallel)
 *
 *  will compare then the difference between tags, and store the result on one of the files (saved
 * again)
 *
 *
 * example of usage:
 * ./mbcmpfiles -i file1.h5m -j file2.h5m -n <tag_name>  -o out.file
 *
 *
 * Basically, will output a new h5m file (out.file), which has an extra tag, corresponding to the
 * difference between the 2 values
 *
 */

#include "moab/ProgOptions.hpp"
#include "moab/Core.hpp"

#include <cmath>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <fstream>

using namespace moab;
using namespace std;

int main( int argc, char* argv[] )
{

    ProgOptions opts;

    std::string inputfile1( "fTargetIntx.h5m" ), inputfile2( "ocn_proj.h5m" ), outfile( "out.h5m" );

    std::string tag_name( "a2oTAG_proj" );

    opts.addOpt< std::string >( "input1,i", "input mesh filename 1", &inputfile1 );
    opts.addOpt< std::string >( "input2,j", "input mesh filename 2", &inputfile2 );
    opts.addOpt< std::string >( "tagname,n", "tag to compare", &tag_name );
    opts.addOpt< std::string >( "outfile,o", "output file", &outfile );

    opts.parseCommandLine( argc, argv );

    ErrorCode rval;
    Core* mb = new Core();

    rval = mb->load_file( inputfile1.c_str() );MB_CHK_SET_ERR( rval, "can't load input file 1" );

    Core* mb2 = new Core();
    rval      = mb2->load_file( inputfile2.c_str() );MB_CHK_SET_ERR( rval, "can't load input file 2" );

    std::cout << " opened " << inputfile1 << " and " << inputfile2 << " with initial h5m data.\n";
    // open the netcdf file, and see if it has that variable we are looking for

    Range nodes;
    rval = mb->get_entities_by_dimension( 0, 0, nodes );MB_CHK_SET_ERR( rval, "can't get nodes" );

    Range edges;
    rval = mb->get_entities_by_dimension( 0, 1, edges );MB_CHK_SET_ERR( rval, "can't get edges" );

    Range cells;
    rval = mb->get_entities_by_dimension( 0, 2, cells );MB_CHK_SET_ERR( rval, "can't get cells" );

    std::cout << inputfile1 << " has " << nodes.size() << " vertices " << edges.size() << " edges " << cells.size()
              << " cells\n";

    // construct maps between global id and handles
    std::map< int, EntityHandle > vGidHandle;
    std::map< int, EntityHandle > eGidHandle;
    std::map< int, EntityHandle > cGidHandle;
    std::vector< int > gids;
    Tag gid;
    rval = mb->tag_get_handle( "GLOBAL_ID", gid );MB_CHK_SET_ERR( rval, "can't get global id tag" );
    gids.resize( nodes.size() );
    rval = mb->tag_get_data( gid, nodes, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on vertices" );
    int i = 0;
    for( Range::iterator vit = nodes.begin(); vit != nodes.end(); vit++ )
    {
        vGidHandle[gids[i++]] = *vit;
    }

    gids.resize( edges.size() );
    rval = mb->tag_get_data( gid, edges, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on edges" );
    i = 0;
    for( Range::iterator vit = edges.begin(); vit != edges.end(); vit++ )
    {
        eGidHandle[gids[i++]] = *vit;
    }

    gids.resize( cells.size() );
    rval = mb->tag_get_data( gid, cells, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on cells" );
    i = 0;
    for( Range::iterator vit = cells.begin(); vit != cells.end(); vit++ )
    {
        cGidHandle[gids[i++]] = *vit;
    }

    Range nodes2;
    rval = mb2->get_entities_by_dimension( 0, 0, nodes2 );MB_CHK_SET_ERR( rval, "can't get nodes2" );

    Range edges2;
    rval = mb2->get_entities_by_dimension( 0, 1, edges2 );MB_CHK_SET_ERR( rval, "can't get edges2" );

    Range cells2;
    rval = mb2->get_entities_by_dimension( 0, 2, cells2 );MB_CHK_SET_ERR( rval, "can't get cells2" );

    std::cout << inputfile2 << " has " << nodes2.size() << " vertices " << edges2.size() << " edges " << cells2.size()
              << " cells\n";

    // construct maps between global id and handles
    std::map< int, EntityHandle > vGidHandle2;
    std::map< int, EntityHandle > eGidHandle2;
    std::map< int, EntityHandle > cGidHandle2;

    Tag gid2;
    rval = mb2->tag_get_handle( "GLOBAL_ID", gid2 );MB_CHK_SET_ERR( rval, "can't get global id tag2" );
    gids.resize( nodes2.size() );
    rval = mb2->tag_get_data( gid2, nodes2, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on vertices2" );

    i = 0;
    for( Range::iterator vit = nodes2.begin(); vit != nodes2.end(); vit++ )
    {
        vGidHandle2[gids[i++]] = *vit;
    }

    gids.resize( edges2.size() );
    rval = mb2->tag_get_data( gid2, edges2, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on edges2" );
    i = 0;
    for( Range::iterator vit = edges2.begin(); vit != edges2.end(); vit++ )
    {
        eGidHandle2[gids[i++]] = *vit;
    }

    gids.resize( cells2.size() );
    rval = mb2->tag_get_data( gid2, cells2, &gids[0] );MB_CHK_SET_ERR( rval, "can't get global id on cells2" );
    i = 0;
    for( Range::iterator vit = cells2.begin(); vit != cells2.end(); vit++ )
    {
        cGidHandle2[gids[i++]] = *vit;
    }

    Tag tag;
    rval = mb->tag_get_handle( tag_name.c_str(), tag );MB_CHK_SET_ERR( rval, "can't get tag on file 1" );

    int len_tag = 0;
    rval        = mb->tag_get_length( tag, len_tag );MB_CHK_SET_ERR( rval, "can't get tag length on tag" );
    std::cout << "length tag : " << len_tag << "\n";

    if( cells.size() != cells2.size() )
    {
        std::cout << " meshes are different between 2 files, cells.size do not agree \n";
        exit( 1 );
    }
    std::vector< double > vals;
    vals.resize( len_tag * cells.size() );
    rval = mb->tag_get_data( tag, cells, &vals[0] );MB_CHK_SET_ERR( rval, "can't get tag data" );

    Tag tag2;
    rval = mb2->tag_get_handle( tag_name.c_str(), tag2 );MB_CHK_SET_ERR( rval, "can't get tag on file 2" );
    std::vector< double > vals2;
    vals2.resize( len_tag * cells2.size() );
    rval = mb2->tag_get_data( tag2, cells2, &vals2[0] );MB_CHK_SET_ERR( rval, "can't get tag data on file 2" );

    rval = mb->delete_entities( edges );MB_CHK_SET_ERR( rval, "can't delete edges from file 1" );

    std::string new_tag_name = tag_name + "_2";
    Tag newTag, newTagDiff;
    double def_val = -1000;
    rval = mb->tag_get_handle( new_tag_name.c_str(), 1, MB_TYPE_DOUBLE, newTag, MB_TAG_CREAT | MB_TAG_DENSE, &def_val );MB_CHK_SET_ERR( rval, "can't define new tag" );

    std::string tag_name_diff = tag_name + "_diff";
    rval = mb->tag_get_handle( tag_name_diff.c_str(), 1, MB_TYPE_DOUBLE, newTagDiff, MB_TAG_CREAT | MB_TAG_DENSE,
                               &def_val );MB_CHK_SET_ERR( rval, "can't define new tag diff" );
    i = 0;
    for( Range::iterator c2it = cells2.begin(); c2it != cells2.end(); c2it++ )
    {
        double val2 = vals2[i];
        int id2     = gids[i];
        i++;
        EntityHandle c1 = cGidHandle[id2];

        rval = mb->tag_set_data( newTag, &c1, 1, &val2 );MB_CHK_SET_ERR( rval, "can't set new tag" );
        int indx    = cells.index( c1 );
        double diff = vals[indx] - val2;
        rval        = mb->tag_set_data( newTagDiff, &c1, 1, &diff );MB_CHK_SET_ERR( rval, "can't set new tag" );
    }

    rval = mb->write_file( outfile.c_str() );MB_CHK_SET_ERR( rval, "can't write file" );
    std::cout << " wrote file " << outfile << "\n";
    return 0;
}