FastBit: join.h Source File (ibis1.1.5)

00001 // File: $Id$
00002 // Author: John Wu <John.Wu at ACM.org>
00003 // Copyright 2008-2009 the Regents of the University of California
00004 #ifndef IBIS_JOIN_H
00005 #define IBIS_JOIN_H
00006 
00013 #include "table.h"      // public data types used by FastBit
00014 #include "part.h"       // ibis::part
00015 
00016 namespace ibis {
00017     class join; // forward definition
00018 } // namespace ibis
00019 
00030 class ibis::join {
00031 public:
00039     static join* create(const ibis::part& partr, const ibis::part& parts,
00040                         const char* colname, const char* condr = 0,
00041                         const char* conds = 0);
00042 
00046     virtual void estimate(uint64_t& nmin, uint64_t& nmax) =0;
00050     virtual int64_t evaluate() =0;
00051 
00052     class result; // An iterator for the results of join
00060     virtual result* select(const std::vector<const char*>& colnames) =0;
00061 
00062     virtual ~join() {};
00063 
00064 protected:
00065     join() {} //< Default constructor.  Can only be used by derived classes.
00066 
00067 private:
00068     join(const join&); // no copying
00069     join& operator=(const join&); // no assignment
00070 }; // class ibis::join
00071 
00074 class ibis::join::result {
00075 public:
00076     virtual ~result() {};
00077 
00078     virtual uint64_t nRows() const=0;
00079     virtual uint32_t nColumns() const=0;
00080 
00082     virtual std::vector<std::string> columnNames() const=0;
00084     virtual ibis::table::typeList columnTypes() const=0;
00086     virtual void describe(std::ostream& out) const=0;
00087 
00090     virtual int fetch() =0;
00091 
00093     virtual int dump(std::ostream& out, const char* del=", ") const=0;
00094 
00099     virtual int getColumnAsByte(const char* cname, char&) const=0;
00100     virtual int getColumnAsUByte(const char* cname, unsigned char&) const=0;
00101     virtual int getColumnAsShort(const char* cname, int16_t&) const=0;
00102     virtual int getColumnAsUShort(const char* cname, uint16_t&) const=0;
00103     virtual int getColumnAsInt(const char* cname, int32_t&) const=0;
00104     virtual int getColumnAsUInt(const char* cname, uint32_t&) const=0;
00105     virtual int getColumnAsLong(const char* cname, int64_t&) const=0;
00106     virtual int getColumnAsULong(const char* cname, uint64_t&) const=0;
00107     virtual int getColumnAsFloat(const char* cname, float&) const=0;
00108     virtual int getColumnAsDouble(const char* cname, double&) const=0;
00109     virtual int getColumnAsString(const char* cname, std::string&) const=0;
00111 
00118     virtual int getColumnAsByte(uint32_t cnum, char&) const=0;
00119     virtual int getColumnAsUByte(uint32_t cnum, unsigned char&) const=0;
00120     virtual int getColumnAsShort(uint32_t cnum, int16_t&) const=0;
00121     virtual int getColumnAsUShort(uint32_t cnum, uint16_t&) const=0;
00122     virtual int getColumnAsInt(uint32_t cnum, int32_t&) const=0;
00123     virtual int getColumnAsUInt(uint32_t cnum, uint32_t&) const=0;
00124     virtual int getColumnAsLong(uint32_t cnum, int64_t&) const=0;
00125     virtual int getColumnAsULong(uint32_t cnum, uint64_t&) const=0;
00126     virtual int getColumnAsFloat(uint32_t cnum, float&) const=0;
00127     virtual int getColumnAsDouble(uint32_t cnum, double&) const=0;
00128     virtual int getColumnAsString(uint32_t cnum, std::string&) const=0;
00130 
00131 protected:
00132     result() {} // Default constructor.  May only be used by a derived class.
00133 
00134 private:
00135     result(const result&); // no copying
00136     result& operator=(const result&); // no assignment
00137 }; // class ibis::join::result
00138 #endif


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