documentinternal.cc

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/* Copyright 2017,2024 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 "backends/documentinternal.h"
 
#include "api/documenttermlist.h"
#include "api/documentvaluelist.h"
#include "str.h"
#include "unicode/description_append.h"
 
#include "xapian/valueiterator.h"
 
#include <memory>
 
using namespace std;
 
namespace Xapian {
 
void
Document::Internal::ensure_terms_fetched() const
{
    if (terms)
        return;
 
    terms.reset(new map<string, TermInfo, std::less<>>());
    termlist_size = 0;
    if (!database)
        return;
 
    unique_ptr<TermList> t(database->open_term_list(did));
    while (t->next() == NULL) {
        ++termlist_size;
        auto&& r = terms->emplace_hint(terms->end(),
                                       t->get_termname(),
                                       TermInfo(t->get_wdf()));
        TermInfo& term = r->second;
        unique_ptr<PositionList> p(t->positionlist_begin());
        if (p) {
            while (p->next()) {
                term.append_position(p->get_position());
            }
        }
    }
}
 
void
Document::Internal::ensure_values_fetched() const
{
    if (values)
        return;
 
    values.reset(new map<Xapian::valueno, string>());
    if (database) {
        fetch_all_values(*values);
    }
}
 
string
Document::Internal::fetch_data() const
{
    return string();
}
 
void
Document::Internal::fetch_all_values(map<Xapian::valueno,
                                     string>& values_) const
{
    values_.clear();
}
 
string
Document::Internal::fetch_value(Xapian::valueno) const
{
    return string();
}
 
Document::Internal::~Internal()
{
    if (database)
        database->invalidate_doc_object(this);
}
 
TermList*
Document::Internal::open_term_list() const
{
    if (terms)
        return new DocumentTermList(this);
 
    if (!database)
        return NULL;
 
    return database->open_term_list(did);
}
 
Xapian::ValueIterator
Document::Internal::values_begin() const
{
    if (!values && database) {
        values.reset(new map<Xapian::valueno, string>());
        fetch_all_values(*values);
    }
 
    if (!values || values->empty())
        return Xapian::ValueIterator();
 
    return Xapian::ValueIterator(new DocumentValueList(this));
}
 
string
Document::Internal::get_description() const
{
    string desc = "Document(docid=";
    desc += str(did);
 
    if (data) {
        desc += ", data=";
        description_append(desc, *data);
    }
 
    if (terms) {
        desc += ", terms[";
        desc += str(terms->size());
        desc += ']';
    }
 
    if (values) {
        desc += ", values[";
        desc += str(values->size());
        desc += ']';
    }
 
    if (database) {
        desc += ", db=";
        desc += database->get_description();
    }
 
    desc += ')';
 
    return desc;
}
 
}