/* iterator.cc
* This file is part of cdbxx library
* Copyright (c) 2004 by Stanislav Ievlev
*
* This file is covered by the GNU Library General Public License,
* which should be included with libcdbxx as the file COPYING.
*/
#include <sstream>
#include <stdexcept>
#include <fcntl.h>
#include <unistd.h>
#include "cdbxx/iterator.hh"
using namespace cdbxx;
iterator::iterator(mem_pos pos,bool fill):
pos_(pos)
{
if (pos_ && fill) fill_pair(); //if position is not zero fill pair with the some values
}
iterator& iterator::operator++() /**< prefix operator */
{
pos_ += keylen_ + valuelen_ + 2 * cdbi_size; //go to the next record
fill_pair();//save all values in temporary place
return *this;
}
iterator iterator::operator++(int)
{
iterator tmp(*this);
operator++();
return tmp;
}
iterator& iterator::operator--() /**< prefix operator */
{
pos_ -= keylen_ + valuelen_ + 2 * cdbi_size; //go to the next record
fill_pair();//save all values in temporary place
return *this;
}
iterator iterator::operator--(int)
{
iterator tmp(*this);
operator--();
return tmp;
}
iterator& iterator::operator+= ( int j )
{
pos_ += (keylen_ + valuelen_ + 2 * cdbi_size) * j; //go to the next record
fill_pair();//save all values in temporary place
return *this;
}
iterator& iterator::operator-= ( int j )
{
pos_ -= (keylen_ + valuelen_ + 2 * cdbi_size) * j; //go to the next record
fill_pair();//save all values in temporary place
return *this;
}
bool iterator::equal(const iterator& other) const
{
return (pos_ == other.pos_);
}
const data_pair& iterator::operator*() const
{
return pair_;
}
const data_pair* iterator::operator->() const
{
return &(operator*());
}
void iterator::fill_pair()
{
keylen_ = ::cdb_unpack(pos_);
valuelen_ = ::cdb_unpack(pos_ + cdbi_size);
pair_.first.len_ = keylen_;
pair_.first.data_ = pos_ + 2 * cdbi_size;
pair_.second.len_ = valuelen_;
pair_.second.data_ = pos_ + 2 * cdbi_size + keylen_;
}