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/** @file net_postlist.h
* @brief Postlists for remote databases
*/
/* Copyright (C) 2007,2009 Lemur Consulting Ltd
* Copyright (C) 2007,2008,2009,2011 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
*/
#ifndef XAPIAN_INCLUDED_NET_POSTLIST_H
#define XAPIAN_INCLUDED_NET_POSTLIST_H
#include <string>
#include "api/leafpostlist.h"
#include "omassert.h"
#include "remote-database.h"
using namespace std;
/** A postlist in a remote database.
*/
class NetworkPostList : public LeafPostList {
friend class RemoteDatabase;
Xapian::Internal::intrusive_ptr<const RemoteDatabase> db;
string postings;
bool started;
const char * pos;
const char * pos_end;
Xapian::docid lastdocid;
Xapian::termcount lastwdf;
Xapian::Internal::intrusive_ptr<PositionList> lastposlist;
Xapian::doccount termfreq;
/// Append a posting to the end of the postlist.
void append_posting(const string & serialised) {
Assert(pos == NULL);
Assert(!started);
postings.append(serialised);
}
public:
/// Constructor.
NetworkPostList(Xapian::Internal::intrusive_ptr<const RemoteDatabase> db_,
const string & term_)
: LeafPostList(term_),
db(db_), started(false), pos(NULL), pos_end(NULL),
lastdocid(0), lastwdf(0), termfreq(0)
{
termfreq = db->read_post_list(term, *this);
}
/// Get number of documents indexed by this term.
Xapian::doccount get_termfreq() const;
/// Get the current document ID.
Xapian::docid get_docid() const;
/// Get the length of the current document.
Xapian::termcount get_doclength() const;
/// Get the number of unique terms in the current document.
Xapian::termcount get_unique_terms() const;
/// Get the Within Document Frequency of the term in the current document.
Xapian::termcount get_wdf() const;
/// Read the position list for the term in the current document and
/// return a pointer to it (owned by the PostList).
PositionList * read_position_list();
/// Read the position list for the term in the current document and
/// return a pointer to it (not owned by the PostList).
PositionList * open_position_list() const;
/// Move to the next document in the postlist (the weight parameter is
/// ignored).
PostList * next(double);
/// Skip forward to the next document with document ID >= the supplied
/// document ID (the weight parameter is ignored).
PostList * skip_to(Xapian::docid did, double weight);
/// Return true if and only if we've moved off the end of the list.
bool at_end() const;
/// Get a description of the postlist.
string get_description() const;
};
#endif /* XAPIAN_INCLUDED_NET_POSTLIST_H */
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