EventListExpander.cpp

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#include "cafe/EventListExpander.hpp"

#include <stdexcept>

#include "TFile.h"
#include "TKey.h"
#include "TList.h"
#include "TEventList.h"

namespace cafe {

    EventListExpander::EventListExpander(const char *url)
        : Expander()
    {
        const char *ptr = strchr(url, ':') + 1;
        TFile file(ptr, "READ");
        if(!file.IsZombie()) {
            if(TList *keys = file.GetListOfKeys()) {
                TIter iter(keys);
                while(TKey *k = (TKey *)iter.Next()) {
                    if(strcmp(k->GetClassName(), "TEventList") == 0) {
                        if(TEventList *ev_list = dynamic_cast<TEventList*>(file.Get(k->GetName()))) {
                            _files.push_back(ev_list->GetTitle());
                        }
                    }
                }
            }
        } else {
            throw std::runtime_error("EventListExpander: cannot open file: " + std::string(url));
        }
    }

    std::string EventListExpander::nextFile()
    {
        if(_files.empty()) return "";
        std::string result = _files.front();
        _files.pop_front();
        return result;
    }
}

ClassImp(cafe::EventListExpander);

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