quaere.h

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// File: $Id$
// Author: John Wu <John.Wu at ACM.org>
// Copyright 2010-2011 the Regents of the University of California
#ifndef IBIS_QUAERE_H
#define IBIS_QUAERE_H

#include "part.h"       // ibis::part

namespace ibis {
    class quaere;       // forward definition
} // namespace ibis

class FASTBIT_CXX_DLLSPEC ibis::quaere {
public:
    static quaere* create(const char* sel, const char* from, const char* where);
    static quaere* create(const ibis::part* partr, const ibis::part* parts,
                          const char* colname, const char* condr = 0,
                          const char* conds = 0, const char* sel = 0);

    virtual void roughCount(uint64_t& nmin, uint64_t& nmax) const = 0;
    virtual int64_t count() const = 0;

    virtual table* select() const = 0;
    virtual ibis::table* select(const ibis::table::stringList& colnames) const = 0;

    virtual ~quaere() {};

protected:
    quaere() {} //< Default constructor.  Only used by derived classes.

private:
    quaere(const quaere&); // no copying
    quaere& operator=(const quaere&); // no assignment
}; // class ibis::quaere
#endif