Impala Documentation

00001 #ifndef Impala_Core_Table_SelectOneColumn_h
00002 #define Impala_Core_Table_SelectOneColumn_h
00003 
00006 #include "Core/Column/Select.h"
00007 #include "Basis/Quid.h"
00008 #include "Core/Table/Filter.h"
00009 
00010 namespace Impala
00011 {
00012 namespace Core
00013 {
00014 namespace Table
00015 {
00016 
00017 
00024 template <class T1, class T2> 
00025 inline void
00026 SelectOneColumn(T1* dst, T2* src, int col, bool* filter, bool doClearDst)
00027 {
00028     int srcSize = src->Size(); // keep orignal size in case dst == src
00029     if (doClearDst)
00030         dst->SetSize(0);
00031     int nr = 0;
00032     if (filter)
00033     {
00034         for (int i=0 ; i<srcSize ; i++)
00035             if (filter[i])
00036                 nr++;
00037     }
00038     else
00039     {
00040         nr = srcSize;
00041     }
00042     dst->ReserveMin(dst->Size() + nr, true);
00043     switch(col)
00044     {
00045     case 1:
00046         Column::Select(dst->GetColumn1(), src->GetColumn1(), filter,
00047                        dst->Size(), 0, srcSize);
00048         break;
00049     case 2:
00050         Column::Select(dst->GetColumn1(), src->GetColumn2(), filter,
00051                        dst->Size(), 0, srcSize);
00052         break;
00053     case 3:
00054         Column::Select(dst->GetColumn1(), src->GetColumn3(), filter,
00055                        dst->Size(), 0, srcSize);
00056         break;
00057     case 4:
00058         Column::Select(dst->GetColumn1(), src->GetColumn4(), filter,
00059                        dst->Size(), 0, srcSize);
00060         break;
00061     case 5:
00062         Column::Select(dst->GetColumn1(), src->GetColumn5(), filter,
00063                        dst->Size(), 0, srcSize);
00064         break;
00065     case 6:
00066         Column::Select(dst->GetColumn1(), src->GetColumn6(), filter,
00067                        dst->Size(), 0, srcSize);
00068         break;
00069     case 7:
00070         Column::Select(dst->GetColumn1(), src->GetColumn7(), filter,
00071                        dst->Size(), 0, srcSize);
00072         break;
00073     case 8:
00074         Column::Select(dst->GetColumn1(), src->GetColumn8(), filter,
00075                        dst->Size(), 0, srcSize);
00076         break;
00077     case 9:
00078         Column::Select(dst->GetColumn1(), src->GetColumn9(), filter,
00079                        dst->Size(), 0, srcSize);
00080         break;
00081     }
00082     dst->SetSize(dst->Size() + nr);
00083 }
00084 
00085 template <class T1, class T2, class Criterion> 
00086 inline void
00087 SelectOneColumn(T1* dst, T2* src, int col, Criterion c, bool doClearDst)
00088 {
00089     bool* filter = Filter(src, c);
00090     SelectOneColumn(dst, src, col, filter, doClearDst);
00091     delete filter;
00092 }
00093 
00094 } // namespace Table
00095 } // namespace Core
00096 } // namespace Impala
00097 
00098 #endif
SelectOneColumn.h
