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/** @file postingiterator.cc
* @brief Class for iterating over a list of document ids.
*/
/* 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/postingiterator.h"
#include "debuglog.h"
#include "omassert.h"
#include "postlist.h"
using namespace std;
namespace Xapian {
void
PostingIterator::decref()
{
Assert(internal);
if (--internal->_refs == 0)
delete internal;
}
void
PostingIterator::post_advance(Internal * res)
{
if (res) {
// FIXME: It seems this can't happen for any PostList which we wrap
// with PostingIterator.
++res->_refs;
decref();
internal = res;
}
if (internal->at_end()) {
decref();
internal = NULL;
}
}
PostingIterator::PostingIterator(Internal *internal_) : internal(internal_)
{
LOGCALL_CTOR(API, "PostingIterator", internal_);
if (!internal) return;
try {
++internal->_refs;
post_advance(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;
}
}
PostingIterator::PostingIterator(const PostingIterator & o)
: internal(o.internal)
{
LOGCALL_CTOR(API, "PostingIterator", o);
if (internal)
++internal->_refs;
}
PostingIterator &
PostingIterator::operator=(const PostingIterator & o)
{
LOGCALL(API, PostingIterator &, "PostingIterator::operator=", o);
if (o.internal)
++o.internal->_refs;
if (internal)
decref();
internal = o.internal;
RETURN(*this);
}
Xapian::docid
PostingIterator::operator*() const
{
LOGCALL(API, Xapian::docid, "PostingIterator::operator*", NO_ARGS);
Assert(internal);
RETURN(internal->get_docid());
}
PostingIterator &
PostingIterator::operator++()
{
LOGCALL(API, PostingIterator &, "PostingIterator::operator++", NO_ARGS);
Assert(internal);
post_advance(internal->next());
RETURN(*this);
}
Xapian::termcount
PostingIterator::get_wdf() const
{
LOGCALL(API, Xapian::termcount, "PostingIterator::get_wdf", NO_ARGS);
Assert(internal);
RETURN(internal->get_wdf());
}
Xapian::termcount
PostingIterator::get_doclength() const
{
LOGCALL(API, Xapian::termcount, "PostingIterator::get_doclength", NO_ARGS);
Assert(internal);
RETURN(internal->get_doclength());
}
Xapian::termcount
PostingIterator::get_unique_terms() const
{
LOGCALL(API, Xapian::termcount, "PostingIterator::get_unique_terms", NO_ARGS);
Assert(internal);
RETURN(internal->get_unique_terms());
}
#if 0 // FIXME: TermIterator supports this, so PostingIterator really ought to.
Xapian::termcount
PostingIterator::positionlist_count() const
{
LOGCALL(API, Xapian::termcount, "PostingIterator::positionlist_count", NO_ARGS);
Assert(internal);
RETURN(internal->positionlist_count());
}
#endif
PositionIterator
PostingIterator::positionlist_begin() const
{
LOGCALL(API, PositionIterator, "PostingIterator::positionlist_begin", NO_ARGS);
Assert(internal);
RETURN(PositionIterator(internal->open_position_list()));
}
void
PostingIterator::skip_to(Xapian::docid did)
{
LOGCALL_VOID(API, "PostingIterator::skip_to", did);
if (internal)
post_advance(internal->skip_to(did));
}
std::string
PostingIterator::get_description() const
{
string desc = "PostingIterator(";
if (internal)
desc += internal->get_description();
desc += ')';
return desc;
}
}
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