REveTableProxyBuilder.cxx

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// @(#)root/eve7:$Id$
// Authors: Matevz Tadel & Alja Mrak-Tadel: 2020
 
/*************************************************************************
 * Copyright (C) 1995-2020, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include "TClass.h"
#include "TROOT.h"
#include <ROOT/REveTableProxyBuilder.hxx>
#include <ROOT/REveTableInfo.hxx>
#include <ROOT/REveViewContext.hxx>
#include <ROOT/REveDataCollection.hxx>
#include <ROOT/REveDataTable.hxx>
#include <ROOT/REveManager.hxx>
 
using namespace ROOT::Experimental;
 
REveTableProxyBuilder::REveTableProxyBuilder() : REveDataProxyBuilderBase(), fTable(nullptr)
{
    fTable = new REveDataTable("ProxyTable");
}
 
REveTableProxyBuilder::~REveTableProxyBuilder()
{
   fTable->Destroy();
   fTable = nullptr;
}
 
// reuse table product
void REveTableProxyBuilder::Clean()
{
}
 
void REveTableProxyBuilder::Build()
{
   if (Collection())
   {
      // printf("REveDataProxyBuilderBase::Build %p %s products %lu\n", m_collection, m_collection->GetCName(), m_products.size());
      try
      {
 
         Clean();
 
         for (auto &pp: m_products)
         {
           
            REveElement* product = pp->m_elements; 
            const REveViewContext* context = pp->m_viewContext;
 
            REveTableViewInfo *info = context->GetTableViewInfo();
            if (info->GetDisplayedCollection() != Collection()->GetElementId()) {
               return;
            }
 
            if (product->NumChildren() == 0) {
               product->AddElement(fTable);
            }
 
            // printf("-----REveTableProxyBuilder::Build() body for %s (%p, %p)\n",collection->GetCName(), collection,
            // Collection() );
 
            if (info->GetConfigChanged() || fTable->NumChildren() == 0) {
               fTable->DestroyElements();
               std::stringstream ss;
               REveTableHandle::Entries_t &tableEntries =
                  context->GetTableViewInfo()->RefTableEntries(Collection()->GetItemClass()->GetName());
               for (const REveTableEntry &spec : tableEntries) {
                  auto c = new REveDataColumn(spec.fName);
                  fTable->AddElement(c);
                  using namespace std::string_literals;
                  std::string exp = spec.fExpression;
                  c->SetPrecision(spec.fPrecision);
                  c->SetExpressionAndType(exp, spec.fType);
                  ss << c->GetFunctionExpressionString();
                  ss << "\n";
               }
               // std::cout << ss.str();
               gROOT->ProcessLine(ss.str().c_str());
            }
            fTable->StampObjProps();
         }
      }
      catch (const std::runtime_error &iException) {
         R__LOG_ERROR(REveLog()) << "Caught exception in build function for item " << Collection()->GetName() << ":\n"
                 << iException.what() << std::endl;
      }
   }
}
 
void REveTableProxyBuilder::SetCollection(REveDataCollection* collection)
{
   REveDataProxyBuilderBase::SetCollection(collection);
   fTable->SetCollection(collection);
}
 
void REveTableProxyBuilder::ModelChanges(const REveDataCollection::Ids_t&, REveDataProxyBuilderBase::Product*)
{
   // printf("REveTableProxyBuilder::ModelChanges\n");
   if (fTable) fTable->StampObjProps();
}
 
void REveTableProxyBuilder::ConfigChanged() {
   Build();
}