TRowIterator Class Reference

Iterator class for TTable rows. More...

#include <table.h>

Collaboration diagram for TRowIterator:

Public Member Functions
	TRowIterator ()
	Default constructor. More...
	TRowIterator (TInt RowIdx, const TTable *TablePtr)
	Constructs iterator to row RowIds of TablePtr. More...
	TRowIterator (const TRowIterator &RowI)
	Copy constructor. More...
TRowIterator &	operator++ (int)
	Increments the iterator. More...
TRowIterator &	Next ()
	Increments the iterator (For Python compatibility). More...
bool	operator< (const TRowIterator &RowI) const
	Checks if this iterator points to a row that is before the one pointed by RowI. More...
bool	operator== (const TRowIterator &RowI) const
	Checks if this iterator points to the same row pointed by RowI. More...
TInt	GetRowIdx () const
	Gets the id of the row pointed by this iterator. More...
TInt	GetIntAttr (TInt ColIdx) const
	Returns value of integer attribute specified by integer column index for current row. More...
TFlt	GetFltAttr (TInt ColIdx) const
	Returns value of floating point attribute specified by float column index for current row. More...
TStr	GetStrAttr (TInt ColIdx) const
	Returns value of string attribute specified by string column index for current row. More...
TInt	GetStrMapById (TInt ColIdx) const
	Returns integer mapping of a string attribute value specified by string column index for current row. More...
TInt	GetIntAttr (const TStr &Col) const
	Returns value of integer attribute specified by attribute name for current row. More...
TFlt	GetFltAttr (const TStr &Col) const
	Returns value of float attribute specified by attribute name for current row. More...
TStr	GetStrAttr (const TStr &Col) const
	Returns value of string attribute specified by attribute name for current row. More...
TInt	GetStrMapByName (const TStr &Col) const
	Returns integer mapping of string attribute specified by attribute name for current row. More...
TBool	CompareAtomicConst (TInt ColIdx, const TPrimitive &Val, TPredComp Cmp)
	Compares value in column ColIdx with given primitive Val. More...
TBool	CompareAtomicConstTStr (TInt ColIdx, const TStr &Val, TPredComp Cmp)
	Compares value in column ColIdx with given TStr Val. More...

Private Attributes
TInt	CurrRowIdx
	Physical row index of current row pointed by iterator. More...
const TTable *	Table
	Reference to table containing this row. More...

Detailed Description

Iterator class for TTable rows.

An iterator class to iterate over all currently existing rows. Iteration over the rows should be done using only this iterator.

Definition at line 330 of file table.h.

Constructor & Destructor Documentation

TRowIterator::TRowIterator ( )

inline

Default constructor.

Definition at line 335 of file table.h.

: CurrRowIdx(0), Table(NULL) {}

TRowIterator::TRowIterator ( TInt  RowIdx, const TTable *  TablePtr  )

inline

Constructs iterator to row RowIds of TablePtr.

Definition at line 337 of file table.h.

: CurrRowIdx(RowIdx), Table(TablePtr) {}

TRowIterator::TRowIterator ( const TRowIterator &  RowI )

inline

Copy constructor.

Definition at line 339 of file table.h.

: CurrRowIdx(RowI.CurrRowIdx), Table(RowI.Table) {}

Member Function Documentation

TBool TRowIterator::CompareAtomicConst	(	TInt	ColIdx,
		const TPrimitive &	Val,
		TPredComp	Cmp
	)

Compares value in column ColIdx with given primitive Val.

Definition at line 190 of file table.cpp.

References atFlt, atInt, atStr, Cmp(), TPredicate::EvalAtom(), TPredicate::EvalStrAtom(), TPrimitive::GetFlt(), GetFltAttr(), TPrimitive::GetInt(), GetIntAttr(), TPrimitive::GetStr(), GetStrAttr(), and TPrimitive::GetType().

Referenced by TTable::SelectAtomicConst().

                                                                                        {
  TBool Result;
  switch (Val.GetType()) {
    case atInt:
      Result = TPredicate::EvalAtom(GetIntAttr(ColIdx), Val.GetInt(), Cmp);
      break;
    case atFlt:
      Result = TPredicate::EvalAtom(GetFltAttr(ColIdx), Val.GetFlt(), Cmp);
      break;
    case atStr:
      Result = TPredicate::EvalStrAtom(GetStrAttr(ColIdx), Val.GetStr(), Cmp);
      break;
    default:
      Result = TBool(false);
  }
  return Result;
}

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TBool TRowIterator::CompareAtomicConstTStr	(	TInt	ColIdx,
		const TStr &	Val,
		TPredComp	Cmp
	)

Compares value in column ColIdx with given TStr Val.

Definition at line 208 of file table.cpp.

References TPredicate::EvalStrAtom(), and GetStrAttr().

Referenced by TTable::SelectAtomicConst().

                                                                                      {
  TBool Result;
  //printf("string compare\n");
  Result = TPredicate::EvalStrAtom(GetStrAttr(ColIdx), Val, Cmp);
  return Result;
}

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TFlt TRowIterator::GetFltAttr

(

TInt

ColIdx

)

const

Returns value of floating point attribute specified by float column index for current row.

Definition at line 159 of file table.cpp.

References CurrRowIdx, TTable::FltCols, and Table.

Referenced by TTable::AddRowI(), TTable::ColGenericOp(), TTable::ColGenericOpMP(), CompareAtomicConst(), TTable::Join(), and TTable::UpdateFltFromTableMP().

                                               {
  return Table->FltCols[ColIdx][CurrRowIdx];
}

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TFlt TRowIterator::GetFltAttr

(

const TStr &

Col

)

const

Returns value of float attribute specified by attribute name for current row.

Definition at line 172 of file table.cpp.

References CurrRowIdx, TTable::FltCols, TTable::GetColIdx(), and Table.

                                                   {
  TInt ColIdx = Table->GetColIdx(Col);
  return Table->FltCols[ColIdx][CurrRowIdx];
}

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TInt TRowIterator::GetIntAttr

(

TInt

ColIdx

)

const

Returns value of integer attribute specified by integer column index for current row.

Definition at line 155 of file table.cpp.

References CurrRowIdx, TTable::IntCols, and Table.

Referenced by TTable::AddRowI(), TTable::ColGenericOp(), TTable::ColGenericOpMP(), CompareAtomicConst(), TTable::GroupByIntColMP(), TTable::Join(), TSnap::ToGraphMP(), TSnap::ToNetworkMP(), TSnap::ToNetworkMP2(), and TTable::UpdateFltFromTableMP().

                                               {
  return Table->IntCols[ColIdx][CurrRowIdx];
}

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TInt TRowIterator::GetIntAttr

(

const TStr &

Col

)

const

Returns value of integer attribute specified by attribute name for current row.

Definition at line 167 of file table.cpp.

References CurrRowIdx, TTable::GetColIdx(), TTable::IntCols, and Table.

                                                   {
  TInt ColIdx = Table->GetColIdx(Col);
  return Table->IntCols[ColIdx][CurrRowIdx];
}

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TInt TRowIterator::GetRowIdx

(

)

const

Gets the id of the row pointed by this iterator.

Definition at line 151 of file table.cpp.

References CurrRowIdx.

Referenced by TTable::ColConcat(), TTable::ColGenericOp(), TTable::ColGenericOpMP(), TTable::GroupByIntColMP(), TTable::Join(), TTable::SelectAtomicConst(), TTable::SelectFirstNRows(), TTable::SetFltColToConstMP(), TSnap::ToGraphMP(), TSnap::ToNetworkMP(), and TSnap::ToNetworkMP2().

                                   {
  return CurrRowIdx;
}

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TStr TRowIterator::GetStrAttr

(

TInt

ColIdx

)

const

Returns value of string attribute specified by string column index for current row.

Definition at line 163 of file table.cpp.

References CurrRowIdx, TTable::GetStrValIdx(), and Table.

Referenced by TTable::ColConcat(), CompareAtomicConst(), and CompareAtomicConstTStr().

                                               {
  return Table->GetStrValIdx(ColIdx, CurrRowIdx);
}

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TStr TRowIterator::GetStrAttr

(

const TStr &

Col

)

const

Returns value of string attribute specified by attribute name for current row.

Definition at line 177 of file table.cpp.

References CurrRowIdx, TTable::GetStrVal(), and Table.

                                                   {
  return Table->GetStrVal(Col, CurrRowIdx);
}

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TInt TRowIterator::GetStrMapById

(

TInt

ColIdx

)

const

Returns integer mapping of a string attribute value specified by string column index for current row.

Definition at line 186 of file table.cpp.

References CurrRowIdx, TTable::StrColMaps, and Table.

Referenced by TTable::Join(), TSnap::ToGraphMP(), TSnap::ToNetworkMP(), and TSnap::ToNetworkMP2().

                                                  {
  return Table->StrColMaps[ColIdx][CurrRowIdx];
}

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TInt TRowIterator::GetStrMapByName

(

const TStr &

Col

)

const

Returns integer mapping of string attribute specified by attribute name for current row.

Definition at line 181 of file table.cpp.

References CurrRowIdx, TTable::GetColIdx(), TTable::StrColMaps, and Table.

Referenced by TTable::AddRowI().

                                                        {
  TInt ColIdx = Table->GetColIdx(Col);
  return Table->StrColMaps[ColIdx][CurrRowIdx];
}

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TRowIterator & TRowIterator::Next

(

)

Increments the iterator (For Python compatibility).

Definition at line 135 of file table.cpp.

References CurrRowIdx, TTable::Next, and Table.

Referenced by operator++().

                                 {
  CurrRowIdx = Table->Next[CurrRowIdx];
  //Assert(CurrRowIdx != TTable::Invalid);
  return *this;
}

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TRowIterator & TRowIterator::operator++

(

int

)

Increments the iterator.

Definition at line 131 of file table.cpp.

References Next().

                                          {
  return this->Next();
}

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bool TRowIterator::operator<

(

const TRowIterator &

RowI

)

const

Checks if this iterator points to a row that is before the one pointed by RowI.

Definition at line 141 of file table.cpp.

References CurrRowIdx.

                                                            {
  if (CurrRowIdx == TTable::Last) { return false; }
  if (RowI.CurrRowIdx == TTable::Last) { return true; }
  return CurrRowIdx < RowI.CurrRowIdx;
}

bool TRowIterator::operator==

(

const TRowIterator &

RowI

)

const

Checks if this iterator points to the same row pointed by RowI.

Definition at line 147 of file table.cpp.

References CurrRowIdx.

                                                              {
  return CurrRowIdx == RowI.CurrRowIdx;
}

Member Data Documentation

TInt TRowIterator::CurrRowIdx

private

Physical row index of current row pointed by iterator.

Definition at line 331 of file table.h.

Referenced by GetFltAttr(), GetIntAttr(), GetRowIdx(), GetStrAttr(), GetStrMapById(), GetStrMapByName(), Next(), operator<(), and operator==().

const TTable* TRowIterator::Table

private

Reference to table containing this row.

Definition at line 332 of file table.h.

Referenced by GetFltAttr(), GetIntAttr(), GetStrAttr(), GetStrMapById(), GetStrMapByName(), and Next().

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The documentation for this class was generated from the following files:

• snap-core/table.h
• snap-core/table.cpp