src/mongo/db/fts/stop_words.cpp


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// stop_words.cpp

/**
*    Copyright (C) 2012 10gen Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    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 Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*    As a special exception, the copyright holders give permission to link the
*    code of portions of this program with the OpenSSL library under certain
*    conditions as described in each individual source file and distribute
*    linked combinations including the program with the OpenSSL library. You
*    must comply with the GNU Affero General Public License in all respects for
*    all of the code used other than as permitted herein. If you modify file(s)
*    with this exception, you may extend this exception to your version of the
*    file(s), but you are not obligated to do so. If you do not wish to do so,
*    delete this exception statement from your version. If you delete this
*    exception statement from all source files in the program, then also delete
*    it in the license file.
*/

#include <set>
#include <string>

#include "mongo/db/fts/stop_words.h"

#include "mongo/base/init.h"
#include "mongo/util/string_map.h"

namespace mongo {

namespace fts {

void loadStopWordMap(StringMap<std::set<std::string>>* m);

namespace {
StringMap<std::shared_ptr<StopWords>> StopWordsMap;
StopWords empty;
}


StopWords::StopWords() {}

StopWords::StopWords(const std::set<std::string>& words) {
    for (std::set<std::string>::const_iterator i = words.begin(); i != words.end(); ++i)
        _words.insert(*i);
}

const StopWords* StopWords::getStopWords(const FTSLanguage* language) {
    auto i = StopWordsMap.find(language->str());
    if (i == StopWordsMap.end())
        return &empty;
    return i->second.get();
}


MONGO_INITIALIZER(StopWords)(InitializerContext* context) {
    StringMap<std::set<std::string>> raw;
    loadStopWordMap(&raw);
    for (StringMap<std::set<std::string>>::const_iterator i = raw.begin(); i != raw.end(); ++i) {
        StopWordsMap[i->first].reset(new StopWords(i->second));
    }
    return Status::OK();
}
}
}