contiguousalldocspostlist.cc

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/* Copyright (C) 2007,2008,2009,2011,2017 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, see
 * <https://www.gnu.org/licenses/>.
 */
 
#include <config.h>
 
#include <string>
 
#include "contiguousalldocspostlist.h"
 
#include "omassert.h"
#include "str.h"
 
using namespace std;
 
Xapian::docid
ContiguousAllDocsPostList::get_docid() const
{
    Assert(did != 0);
    return did;
}
 
Xapian::termcount
ContiguousAllDocsPostList::get_wdf() const
{
    Assert(did != 0);
    return 1;
}
 
PositionList *
ContiguousAllDocsPostList::read_position_list()
{
    // Throws the same exception.
    return ContiguousAllDocsPostList::open_position_list();
}
 
PositionList *
ContiguousAllDocsPostList::open_position_list() const
{
    throw Xapian::InvalidOperationError("Position lists not meaningful for ContiguousAllDocsPostList");
}
 
PostList *
ContiguousAllDocsPostList::next(double)
{
    // Docids are contiguous from 1 so termfreq gives the highest docid.
    if (did == termfreq) {
        did = 0;
    } else {
        ++did;
    }
    return NULL;
}
 
PostList *
ContiguousAllDocsPostList::skip_to(Xapian::docid target, double)
{
    if (target > did) {
        // Docids are contiguous from 1 so termfreq gives the highest docid.
        if (target > termfreq) {
            did = 0;
        } else {
            did = target;
        }
    }
    return NULL;
}
 
bool
ContiguousAllDocsPostList::at_end() const
{
    return did == 0;
}
 
Xapian::termcount
ContiguousAllDocsPostList::get_wdf_upper_bound() const
{
    return 1;
}
 
string
ContiguousAllDocsPostList::get_description() const
{
    string msg("ContiguousAllDocsPostList(1..");
    msg += str(termfreq);
    msg += ')';
    return msg;
}