Reader.h

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// -*- lsst-c++ -*-
#ifndef AFW_TABLE_IO_Reader_h_INCLUDED
#define AFW_TABLE_IO_Reader_h_INCLUDED

#include "lsst/base.h"

namespace lsst { namespace afw { namespace table { 

class BaseTable;

namespace io {

class Reader {
public:

    template <typename ContainerT>
    ContainerT read() {
#if 1
        // Work around a clang++ version 3.0 (tags/Apple/clang-211.12) bug with shared_ptr reference counts
        PTR(typename ContainerT::Table) table;
        {
            PTR(BaseTable) tmpTable = _readTable();
            table = boost::dynamic_pointer_cast<typename ContainerT::Table>(tmpTable);
        }
#else
        PTR(typename ContainerT::Table) table 
            = boost::dynamic_pointer_cast<typename ContainerT::Table>(_readTable());
#endif
        if (!table) {
            throw LSST_EXCEPT(
                lsst::pex::exceptions::RuntimeError,
                "Container's table type is not compatible with on-disk table type."
            );
        }
        ContainerT container(table);
        PTR(BaseRecord) record = _readRecord(table);
        while (record) {
            container.insert(
                container.end(),
                boost::static_pointer_cast<typename ContainerT::Record>(record)
            );
            record = _readRecord(table);
        }
        return container;
    }
    
    virtual ~Reader() {}

protected:

    virtual PTR(BaseTable) _readTable() = 0;

    virtual PTR(BaseRecord) _readRecord(PTR(BaseTable) const & table) = 0;
};

}}}} // namespace lsst::afw::table::io

#endif // !AFW_TABLE_IO_Reader_h_INCLUDED