BaseTabIter.h

Classes

BaseTableIterator -- Base class for table iterator (full description)

class BaseTableIterator

Interface

Public Members
BaseTableIterator (BaseTable*, const Block<String>& columnNames, const PtrBlock<ObjCompareFunc*>&, const Block<Int>& orders, int option)
BaseTableIterator* clone() const
virtual ~BaseTableIterator()
virtual void reset()
virtual BaseTable* next()
Protected Members
BaseTableIterator (const BaseTableIterator&)
Private Members
BaseTableIterator& operator= (const BaseTableIterator&)

Description

Review Status

Reviewed By:
UNKNOWN
Date Reviewed:
before2004/08/25

Prerequisite

Etymology

BaseTableIterator is the base class for the classes doing the actual iterating through a table.

Synopsis

BaseTableIterator is the base class for the table iterators. It is a letter class of the envelope TableIterator. Currently there are no classes derived from BaseTableIterator, since it can do all the work itself. However, in the future this need not to be true anymore.

BaseTableIterator iterates by sorting the table in the required order and then creating a RefTable for each step containing the rows for that iteration step. Each iteration step assembles the rows with equal key values.

To Do

Member Description

BaseTableIterator (BaseTable*, const Block<String>& columnNames, const PtrBlock<ObjCompareFunc*>&, const Block<Int>& orders, int option)

Create the table iterator to iterate through the given columns in the given order. The given compare functions will be used for the sort and to compare if values are equal. If a function pointer is zero, the default compare function from ObjCompare will be used.

BaseTableIterator* clone() const

Clone this iterator.

virtual ~BaseTableIterator()

virtual void reset()

Reset the iterator (i.e. restart iteration).

virtual BaseTable* next()

Return the next group.

BaseTableIterator (const BaseTableIterator&)

Copy constructor (to be used by clone)

BaseTableIterator& operator= (const BaseTableIterator&)

Assignment is not needed, because the assignment operator in the envelope class TableIterator has reference semantics. Declaring it private, makes it unusable.