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/** @file termiterator.cc
* @brief Class for iterating over a list of terms.
*/
/* 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/termiterator.h"
#include "debuglog.h"
#include "omassert.h"
#include "termlist.h"
using namespace std;
namespace Xapian {
void
TermIterator::decref()
{
Assert(internal);
if (--internal->_refs == 0)
delete internal;
}
void
TermIterator::post_advance(Internal * res)
{
if (res) {
// This can happen with iterating allterms from multiple databases.
++res->_refs;
decref();
internal = res;
}
if (internal->at_end()) {
decref();
internal = NULL;
}
}
TermIterator::TermIterator(Internal *internal_) : internal(internal_)
{
LOGCALL_CTOR(API, "TermIterator", 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;
}
}
TermIterator::TermIterator(const TermIterator & o)
: internal(o.internal)
{
LOGCALL_CTOR(API, "TermIterator", o);
if (internal)
++internal->_refs;
}
TermIterator &
TermIterator::operator=(const TermIterator & o)
{
LOGCALL(API, TermIterator &, "TermIterator::operator=", o);
if (o.internal)
++o.internal->_refs;
if (internal)
decref();
internal = o.internal;
RETURN(*this);
}
string
TermIterator::operator*() const
{
LOGCALL(API, string, "TermIterator::operator*", NO_ARGS);
Assert(internal);
RETURN(internal->get_termname());
}
TermIterator &
TermIterator::operator++()
{
LOGCALL(API, TermIterator &, "TermIterator::operator++", NO_ARGS);
Assert(internal);
post_advance(internal->next());
RETURN(*this);
}
Xapian::termcount
TermIterator::get_wdf() const
{
LOGCALL(API, Xapian::termcount, "TermIterator::get_wdf", NO_ARGS);
Assert(internal);
RETURN(internal->get_wdf());
}
Xapian::doccount
TermIterator::get_termfreq() const
{
LOGCALL(API, Xapian::doccount, "TermIterator::get_termfreq", NO_ARGS);
Assert(internal);
RETURN(internal->get_termfreq());
}
Xapian::termcount
TermIterator::positionlist_count() const
{
LOGCALL(API, Xapian::termcount, "TermIterator::positionlist_count", NO_ARGS);
Assert(internal);
RETURN(internal->positionlist_count());
}
PositionIterator
TermIterator::positionlist_begin() const
{
LOGCALL(API, PositionIterator, "TermIterator::positionlist_begin", NO_ARGS);
Assert(internal);
RETURN(internal->positionlist_begin());
}
void
TermIterator::skip_to(const string & term)
{
LOGCALL_VOID(API, "TermIterator::skip_to", term);
if (internal)
post_advance(internal->skip_to(term));
}
std::string
TermIterator::get_description() const
{
#if 0 // FIXME: Add TermIterator::Internal::get_description() method.
string desc = "TermIterator(";
if (internal)
desc += internal->get_description();
desc += ')';
return desc;
#else
return "TermIterator()";
#endif
}
}
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