filter.h

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// File: $Id$
// Author: John Wu <John.Wu at ACM.org>
// Copyright 2010-2012 the Regents of the University of California
#ifndef IBIS_FILTER_H
#define IBIS_FILTER_H

#include "quaere.h"             // ibis::quaere
#include "whereClause.h"        // ibis::whereClause
#include "selectClause.h"       // ibis::selectClause

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

class ibis::filter : public ibis::quaere {
public:
    explicit filter(const ibis::whereClause* w);
    filter(const ibis::selectClause* s, const ibis::constPartList* p,
           const ibis::whereClause* w);
    virtual ~filter();

    virtual void    roughCount(uint64_t& nmin, uint64_t& nmax) const;
    virtual int64_t count() const;
    virtual table*  select() const;
    virtual table*  select(const char*) const;
    virtual table*  select(const ibis::table::stringList& colnames) const;

    static table*   sift(const ibis::selectClause  &sel,
                         const ibis::constPartList &pl,
                         const ibis::whereClause   &wc);
    static table*   sift0(const ibis::selectClause  &,
                          const ibis::constPartList &);
    static table*   sift0S(const ibis::selectClause  &,
                           const ibis::constPartList &);
    static table*   sift1(const ibis::selectClause  &,
                          const ibis::constPartList &,
                          const ibis::whereClause   &);
    static table*   sift1S(const ibis::selectClause  &,
                           const ibis::constPartList &,
                           const ibis::whereClause   &);
    static table*   sift2(const ibis::selectClause  &,
                          const ibis::constPartList &,
                          const ibis::whereClause   &);
    static table*   sift2(const ibis::selectClause  &,
                          const ibis::constPartList &,
                          const ibis::array_t<ibis::bitvector*> &);
    static table*   sift2(const ibis::selectClause  &,
                          const ibis::constPartList &,
                          const ibis::whereClause   &,
                          ibis::array_t<ibis::bitvector*> &);
    static table*   sift2S(const ibis::selectClause  &,
                           const ibis::constPartList &,
                           const ibis::whereClause   &);
    static table*   sift2S(const ibis::selectClause  &,
                           const ibis::constPartList &,
                           const ibis::array_t<ibis::bitvector*> &);
    static table*   sift2S(const ibis::selectClause  &,
                           const ibis::constPartList &,
                           const ibis::whereClause   &,
                           ibis::array_t<ibis::bitvector*> &);

protected:
    const ibis::whereClause *wc_;
    const ibis::constPartList *parts_;
    const ibis::selectClause *sel_;
    mutable array_t<ibis::bitvector*> hits_;
    mutable array_t<ibis::bitvector*> cand_;

    filter() : wc_(0), parts_(0), sel_(0) {}

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