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/** @file positioniterator.cc
* @brief Class for iterating over term positions.
*/
/* Copyright (C) 2008,2009,2010,2011,2013 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "xapian/positioniterator.h"
#include "debuglog.h"
#include "omassert.h"
#include "backends/positionlist.h"
using namespace std;
namespace Xapian {
void
PositionIterator::decref()
{
Assert(internal);
if (--internal->_refs == 0)
delete internal;
}
PositionIterator::PositionIterator(Internal *internal_) : internal(internal_)
{
LOGCALL_CTOR(API, "PositionIterator", internal_);
Assert(internal);
++internal->_refs;
try {
internal->next();
} catch (...) {
// The destructor only runs if the constructor completes, so we have to
// take care of cleaning up for ourselves here.
decref();
throw;
}
if (internal->at_end()) {
decref();
internal = NULL;
}
}
PositionIterator::PositionIterator(const PositionIterator & o)
: internal(o.internal)
{
LOGCALL_CTOR(API, "PositionIterator", o);
if (internal)
++internal->_refs;
}
PositionIterator &
PositionIterator::operator=(const PositionIterator & o)
{
LOGCALL(API, PositionIterator &, "PositionIterator::operator=", o);
if (o.internal)
++o.internal->_refs;
if (internal)
decref();
internal = o.internal;
RETURN(*this);
}
Xapian::termpos
PositionIterator::operator*() const
{
LOGCALL(API, Xapian::termpos, "PositionIterator::operator*", NO_ARGS);
Assert(internal);
RETURN(internal->get_position());
}
PositionIterator &
PositionIterator::operator++()
{
LOGCALL(API, PositionIterator &, "PositionIterator::operator++", NO_ARGS);
Assert(internal);
internal->next();
if (internal->at_end()) {
decref();
internal = NULL;
}
RETURN(*this);
}
void
PositionIterator::skip_to(Xapian::termpos pos)
{
LOGCALL_VOID(API, "PositionIterator::skip_to", pos);
if (internal) {
internal->skip_to(pos);
if (internal->at_end()) {
decref();
internal = NULL;
}
}
}
std::string
PositionIterator::get_description() const
{
#if 0 // FIXME: Add PositionIterator::Internal::get_description() method.
string desc = "PositionIterator(";
if (internal)
desc += internal->get_description();
desc += ')';
return desc;
#else
return "PositionIterator()";
#endif
}
}
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