HepMC Reference Documentation HepMC

IO_GenEvent.cc

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//--------------------------------------------------------------------------

// garren@fnal.gov, July 2006
// event input/output in ascii format for machine reading
// extended format contains HeavyIon and PdfInfo classes

#include "HepMC/IO_GenEvent.h"
#include "HepMC/GenEvent.h"
#include "HepMC/ParticleDataTable.h"
#include "HepMC/HeavyIon.h"
#include "HepMC/PdfInfo.h"
#include "HepMC/CommonIO.h"
#include "HepMC/Version.h"

namespace HepMC {

    IO_GenEvent::IO_GenEvent( const char* filename, std::ios::openmode mode ) 
    : m_mode(mode), 
      m_file(filename, mode), 
      m_ostr(0),
      m_istr(0),
      m_iostr(0),
      m_finished_first_event_io(false),
      m_have_file(false),
      m_common_io()
    {
        if ( (m_mode&std::ios::out && m_mode&std::ios::in) ||
             (m_mode&std::ios::app && m_mode&std::ios::in) ) {
            std::cerr << "IO_GenEvent::IO_GenEvent Error, open of file requested "
                      << "of input AND output type. Not allowed. Closing file."
                      << std::endl;
            m_file.close();
            return;
        }
        // precision 16 (# digits following decimal point) is the minimum that
        //  will capture the full information stored in a double
        m_file.precision(16);
        // we use decimal to store integers, because it is smaller than hex!
        m_file.setf(std::ios::dec,std::ios::basefield);
        m_file.setf(std::ios::scientific,std::ios::floatfield);
        // now we set the streams
        m_iostr = &m_file;
        if ( m_mode&std::ios::in ) {
            m_istr = &m_file;
            m_ostr = NULL;
        }
        if ( m_mode&std::ios::out ) {
            m_ostr = &m_file;
            m_istr = NULL;
        }
        m_have_file = true;
    }

    IO_GenEvent::IO_GenEvent( std::istream & istr ) 
    : m_ostr(0),
      m_istr(&istr),
      m_iostr(&istr),
      m_finished_first_event_io(false),
      m_have_file(false),
      m_common_io()
    { }

    IO_GenEvent::IO_GenEvent( std::ostream & ostr )
    : m_ostr(&ostr),
      m_istr(0),
      m_iostr(&ostr),
      m_finished_first_event_io(false),
      m_have_file(false),
      m_common_io()
    {
        // precision 16 (# digits following decimal point) is the minimum that
        //  will capture the full information stored in a double
        m_ostr->precision(16);
        // we use decimal to store integers, because it is smaller than hex!
        m_ostr->setf(std::ios::dec,std::ios::basefield);
        m_ostr->setf(std::ios::scientific,std::ios::floatfield);
    }

    IO_GenEvent::~IO_GenEvent() {
        write_end_listing();
        if(m_have_file) m_file.close();
    }

    void IO_GenEvent::print( std::ostream& ostr ) const { 
        ostr << "IO_GenEvent: unformated ascii file IO for machine reading.\n"; 
        if(m_have_file)    ostr  << "\tFile openmode: " << m_mode ;
        ostr << " stream state: " << m_ostr->rdstate()
             << " bad:" << (m_ostr->rdstate()&std::ios::badbit)
             << " eof:" << (m_ostr->rdstate()&std::ios::eofbit)
             << " fail:" << (m_ostr->rdstate()&std::ios::failbit)
             << " good:" << (m_ostr->rdstate()&std::ios::goodbit) << std::endl;
    }

    void IO_GenEvent::write_event( const GenEvent* evt ) {
        //
        // make sure the state is good, and that it is in output mode
        if ( !evt  ) return;
        if ( m_ostr == NULL ) {
            std::cerr << "HepMC::IO_GenEvent::write_event "
                      << " attempt to write to input file." << std::endl;
            return;
        }
        //
        // write event listing key before first event only.
        if ( !m_finished_first_event_io ) {
            m_finished_first_event_io = 1;
            *m_ostr << "\n" << "HepMC::Version " << versionName();
            *m_ostr << "\n";
            m_common_io.write_IO_GenEvent_Key(*m_ostr);
        }
        //
        // output the event data including the number of primary vertices
        //  and the total number of vertices
        std::vector<long> random_states = evt->random_states();
        *m_ostr << 'E';
        output( evt->event_number() );
        output( evt->mpi() );
        output( evt->event_scale() );
        output( evt->alphaQCD() );
        output( evt->alphaQED() );
        output( evt->signal_process_id() );
        output(   ( evt->signal_process_vertex() ?
                    evt->signal_process_vertex()->barcode() : 0 )   );
        output( evt->vertices_size() ); // total number of vertices.
        write_beam_particles( evt->beam_particles() );
        output( (int)random_states.size() );
        for ( std::vector<long>::iterator rs = random_states.begin(); 
              rs != random_states.end(); ++rs ) {
            output( *rs );
        }
        output( (int)evt->weights().size() );
        for ( WeightContainer::const_iterator w = evt->weights().begin(); 
              w != evt->weights().end(); ++w ) {
            output( *w );
        }
        output('\n');
        write_heavy_ion( evt->heavy_ion() );
        write_pdf_info( evt->pdf_info() );
        //
        // Output all of the vertices - note there is no real order.
        for ( GenEvent::vertex_const_iterator v = evt->vertices_begin();
              v != evt->vertices_end(); ++v ) {
            write_vertex( *v );
        }
    }

    bool IO_GenEvent::fill_next_event( GenEvent* evt ){
        //
        //
        // test that evt pointer is not null
        if ( !evt ) {
            std::cerr 
                << "IO_GenEvent::fill_next_event error - passed null event." 
                << std::endl;
            return false;
        }
        // make sure the stream is good, and that it is in input mode
        if ( !(*m_istr) ) return false;
        if ( !m_istr ) {
            std::cerr << "HepMC::IO_GenEvent::fill_next_event "
                      << " attempt to read from output file." << std::endl;
            return false;
        }
        //
        // search for event listing key before first event only.
        //
        // skip through the file just after first occurence of the start_key
        int iotype = 0;
        if ( !m_finished_first_event_io ) {
            iotype = m_common_io.find_file_type(*m_istr);
            if( iotype <= 0 ) {
                std::cerr << "IO_GenEvent::fill_next_event start key not found "
                          << "setting badbit." << std::endl;
                m_istr->clear(std::ios::badbit); 
                return false;
            }
            m_finished_first_event_io = 1;
        }
        //
        // test to be sure the next entry is of type "E" then ignore it
        if ( !(*m_istr) ) { 
                std::cerr << "IO_GenEvent::fill_next_event end of stream found "
                          << "setting badbit." << std::endl;
                m_istr->clear(std::ios::badbit); 
                return false;
        }
        if ( !(*m_istr) || m_istr->peek()!='E' ) { 
            // if the E is not the next entry, then check to see if it is
            // the end event listing key - if yes, search for another start key
            int ioendtype = m_common_io.find_end_key(*m_istr);
            if ( ioendtype == iotype ) {
                iotype = m_common_io.find_file_type(*m_istr);
                if( iotype <= 0 ) {
                    // this is the only case where we set an EOF state
                    m_istr->clear(std::ios::eofbit);
                    return false;
                }
            } else if ( ioendtype > 0 ) {
                std::cerr << "IO_GenEvent::fill_next_event end key does not match start key "
                          << "setting badbit." << std::endl;
                m_istr->clear(std::ios::badbit); 
                return false;
            } else {
                std::cerr << "IO_GenEvent::fill_next_event end key not found "
                          << "setting badbit." << std::endl;
                m_istr->clear(std::ios::badbit); 
                return false;
            }
        }
        m_istr->ignore();
        // call the appropriate read method
        if( m_common_io.io_type() == gen ) {
            return m_common_io.read_io_genevent(m_istr, evt);
        } else if( m_common_io.io_type() == ascii ) { 
            return m_common_io.read_io_ascii(m_istr, evt);
        } else if( m_common_io.io_type() == extascii ) { 
            return m_common_io.read_io_extendedascii(m_istr, evt);
        } else if( m_common_io.io_type() == ascii_pdt ) { 
        } else if( m_common_io.io_type() == extascii_pdt ) { 
        }
        // should not get to this statement
        return false;
    }

    void IO_GenEvent::write_comment( const std::string comment ) {
        // make sure the stream is good, and that it is in output mode
        if ( !(*m_ostr) ) return;
        if ( m_ostr == NULL ) {
            std::cerr << "HepMC::IO_GenEvent::write_comment "
                      << " attempt to write to input file." << std::endl;
            return;
        }
        // write end of event listing key if events have already been written
        write_end_listing();
        // insert the comment key before the comment
        *m_ostr << "\n" << "HepMC::IO_GenEvent-COMMENT\n";
        *m_ostr << comment << std::endl;
    }

    void IO_GenEvent::write_vertex( GenVertex* v ) {
        // assumes mode has already been checked
        if ( !v || !(*m_ostr) ) {
            std::cerr << "IO_GenEvent::write_vertex !v||!(*m_ostr), "
                      << "v="<< v << " setting badbit" << std::endl;
            m_ostr->clear(std::ios::badbit); 
            return;
        }
        // First collect info we need
        // count the number of orphan particles going into v
        int num_orphans_in = 0;
        for ( GenVertex::particles_in_const_iterator p1
                  = v->particles_in_const_begin();
              p1 != v->particles_in_const_end(); ++p1 ) {
            if ( !(*p1)->production_vertex() ) ++num_orphans_in;
        }
        //
        *m_ostr << 'V';
        output( v->barcode() ); // v's unique identifier
        output( v->id() );
        output( v->position().x() );
        output( v->position().y() );
        output( v->position().z() );
        output( v->position().t() );
        output( num_orphans_in );
        output( (int)v->particles_out_size() );
        output( (int)v->weights().size() );
        for ( WeightContainer::iterator w = v->weights().begin(); 
              w != v->weights().end(); ++w ) {
            output( *w );
        }
        output('\n');
        for ( GenVertex::particles_in_const_iterator p2 
                  = v->particles_in_const_begin();
              p2 != v->particles_in_const_end(); ++p2 ) {
            if ( !(*p2)->production_vertex() ) {
                write_particle( *p2 );
            }
        }
        for ( GenVertex::particles_out_const_iterator p3 
                  = v->particles_out_const_begin();
              p3 != v->particles_out_const_end(); ++p3 ) {
            write_particle( *p3 );
        }
    }

    void IO_GenEvent::write_beam_particles( 
        std::pair<HepMC::GenParticle *,HepMC::GenParticle *> pr ) {
        GenParticle* p = pr.first;
        //m_file << 'B';
        if(!p) {
           output( 0 );
        } else {
           output( p->barcode() );
        }
        p = pr.second;
        if(!p) {
           output( 0 );
        } else {
           output( p->barcode() );
        }
    }

    void IO_GenEvent::write_heavy_ion( HeavyIon const * ion ) {
        // assumes mode has already been checked
        if ( !(*m_ostr) ) {
            std::cerr << "IO_GenEvent::write_heavy_ion !(*m_ostr), "
                      << " setting badbit" << std::endl;
            m_ostr->clear(std::ios::badbit); 
            return;
        }
        *m_ostr << 'H';
        // HeavyIon* is set to 0 by default
        if ( !ion  ) {
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0 );
            output( 0. );
            output( 0. );
            output( 0. );
            output( 0. );
            output('\n');
            return;
        }
        //
        output( ion->Ncoll_hard() );
        output( ion->Npart_proj() );
        output( ion->Npart_targ() );
        output( ion->Ncoll() );
        output( ion->spectator_neutrons() );
        output( ion->spectator_protons() );
        output( ion->N_Nwounded_collisions() );
        output( ion->Nwounded_N_collisions() );
        output( ion->Nwounded_Nwounded_collisions() );
        output( ion->impact_parameter() );
        output( ion->event_plane_angle() );
        output( ion->eccentricity() );
        output( ion->sigma_inel_NN() );
        output('\n');
    }

    void IO_GenEvent::write_pdf_info( PdfInfo const * pdf ) {
        // assumes mode has already been checked
        if ( !(*m_ostr) ) {
            std::cerr << "IO_GenEvent::write_pdf_info !(*m_ostr), "
                      << " setting badbit" << std::endl;
            m_ostr->clear(std::ios::badbit); 
            return;
        }
        *m_ostr << 'F';
        // PdfInfo* is set to 0 by default
        if ( !pdf ) {
            output( 0 );
            output( 0 );
            output( 0. );
            output( 0. );
            output( 0. );
            output( 0. );
            output( 0. );
            output('\n');
            return;
        }
        //
        output( pdf->id1() );
        output( pdf->id2() );
        output( pdf->x1() );
        output( pdf->x2() );
        output( pdf->scalePDF() );
        output( pdf->pdf1() );
        output( pdf->pdf2() );
        output('\n');
    }

    void IO_GenEvent::write_particle( GenParticle* p ) {
        // assumes mode has already been checked
        if ( !p || !(*m_ostr) ) {
            std::cerr << "IO_GenEvent::write_particle !p||!(*m_ostr), "
                      << "p="<< p << " setting badbit" << std::endl;
            m_ostr->clear(std::ios::badbit); 
            return;
        }
        *m_ostr << 'P';
        output( p->barcode() );
        output( p->pdg_id() );
        output( p->momentum().px() );
        output( p->momentum().py() );
        output( p->momentum().pz() );
        output( p->momentum().e() );
        output( p->generated_mass() );
        output( p->status() );
        output( p->polarization().theta() );
        output( p->polarization().phi() );
        // since end_vertex is oftentimes null, this CREATES a null vertex
        // in the map
        output(   ( p->end_vertex() ? p->end_vertex()->barcode() : 0 )  );
        *m_ostr << ' ' << p->flow() << "\n";
    }

    void IO_GenEvent::write_particle_data( const ParticleData* pdata ) {
        // assumes mode has already been checked
        if ( !pdata || !(*m_ostr) ) {
            std::cerr << "IO_GenEvent::write_particle_data !pdata||!(*m_ostr), "
                      << "pdata="<< pdata << " setting badbit" << std::endl;
            m_ostr->clear(std::ios::badbit); 
            return;
        }
        *m_ostr << 'D';
        output( pdata->pdg_id() );
        output( pdata->charge() );
        output( pdata->mass() );
        output( pdata->clifetime() );
        output( (int)(pdata->spin()*2.+.1) );
        // writes the first 21 characters starting with 0
        *m_ostr << " " << pdata->name().substr(0,21) << "\n";
    }

    HeavyIon* IO_GenEvent::read_heavy_ion()
    {
        // assumes mode has already been checked
        //
        // test to be sure the next entry is of type "H" then ignore it
        if ( !(*m_istr) || m_istr->peek()!='H' ) {
            std::cerr << "IO_GenEvent::read_heavy_ion setting badbit." << std::endl;
            m_istr->clear(std::ios::badbit); 
            return false;
        } 
        m_istr->ignore();
        // read values into temp variables, then create a new HeavyIon object
        int nh =0, np =0, nt =0, nc =0, 
            neut = 0, prot = 0, nw =0, nwn =0, nwnw =0;
        float impact = 0., plane = 0., xcen = 0., inel = 0.; 
        *m_istr >> nh >> np >> nt >> nc >> neut >> prot
               >> nw >> nwn >> nwnw >> impact >> plane >> xcen >> inel;
        m_istr->ignore(2,'\n');
        if( nh == 0 ) return false;
        HeavyIon* ion = new HeavyIon(nh, np, nt, nc, neut, prot,
                                     nw, nwn, nwnw, 
                                     impact, plane, xcen, inel );
        //
        return ion;
    }

    PdfInfo* IO_GenEvent::read_pdf_info()
    {
        // assumes mode has already been checked
        //
        // test to be sure the next entry is of type "F" then ignore it
        if ( !(*m_istr) || m_istr->peek() !='F') {
            std::cerr << "IO_GenEvent::read_pdf_info setting badbit." << std::endl;
            m_istr->clear(std::ios::badbit); 
            return false;
        } 
        m_istr->ignore();
        // read values into temp variables, then create a new PdfInfo object
        int id1 =0, id2 =0;
        double  x1 = 0., x2 = 0., scale = 0., pdf1 = 0., pdf2 = 0.; 
        *m_istr >> id1 >> id2 >> x1 >> x2 >> scale >> pdf1 >> pdf2;
        m_istr->ignore(2,'\n');
        if( id1 == 0 ) return false;
        PdfInfo* pdf = new PdfInfo( id1, id2, x1, x2, scale, pdf1, pdf2);
        //
        return pdf;
    }

    GenParticle* IO_GenEvent::read_particle(
        TempParticleMap& particle_to_end_vertex ){
        // assumes mode has already been checked
        //
        // test to be sure the next entry is of type "P" then ignore it
        if ( !(*m_istr) || m_istr->peek()!='P' ) { 
            std::cerr << "IO_GenEvent::read_particle setting badbit." 
                      << std::endl;
            m_istr->clear(std::ios::badbit); 
            return false;
        } 
        m_istr->ignore();
        //
        // declare variables to be read in to, and read everything except flow
        double px = 0., py = 0., pz = 0., e = 0., m = 0., theta = 0., phi = 0.;
        int bar_code = 0, id = 0, status = 0, end_vtx_code = 0, flow_size = 0;
        *m_istr >> bar_code >> id >> px >> py >> pz >> e >> m >> status 
               >> theta >> phi >> end_vtx_code >> flow_size;
        //
        // read flow patterns if any exist
        Flow flow;
        int code_index, code;
        for ( int i = 1; i <= flow_size; ++i ) {
            *m_istr >> code_index >> code;
            flow.set_icode( code_index,code);
        }
        m_istr->ignore(2,'\n'); // '\n' at end of entry
        GenParticle* p = new GenParticle( FourVector(px,py,pz,e), 
                                    id, status, flow, 
                                    Polarization(theta,phi) );
        p->set_generated_mass( m );
        p->suggest_barcode( bar_code );
        //
        // all particles are connected to their end vertex separately 
        // after all particles and vertices have been created - so we keep
        // a map of all particles that have end vertices
        if ( end_vtx_code != 0 ) {
            particle_to_end_vertex.addEndParticle(p,end_vtx_code);
        }
        return p;
    }

    ParticleData* IO_GenEvent::read_particle_data( ParticleDataTable* pdt ) {
        // assumes mode has already been checked
        //
        // test to be sure the next entry is of type "D" then ignore it
        if ( !(*m_istr) || m_istr->peek()!='D' ) return false;
        m_istr->ignore();
        //
        // read values into temp variables then create new ParticleData object
        char its_name[22];
        int its_id = 0, its_spin = 0;  
        double its_charge = 0, its_mass = 0, its_clifetime = 0;
        *m_istr >> its_id >> its_charge >> its_mass 
               >> its_clifetime >> its_spin;
        m_istr->ignore(1); // eat the " "
        m_istr->getline( its_name, 22, '\n' );
        ParticleData* pdata = new ParticleData( its_name, its_id, its_charge, 
                                                its_mass, its_clifetime, 
                                                double(its_spin)/2.);
        pdt->insert(pdata);
        return pdata;
    }

    bool IO_GenEvent::write_end_listing() {
        if ( m_finished_first_event_io && (m_ostr != NULL) ) {
            m_common_io.write_IO_GenEvent_End(*m_ostr);
            *m_ostr << std::flush;
            m_finished_first_event_io = 0;
            return true;
        }
        return false;
    }
        
} // HepMC

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