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// expression_text.cpp
/**
* Copyright (C) 2013 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 "mongo/platform/basic.h"
#include "mongo/db/matcher/expression_text.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/fts/fts_language.h"
#include "mongo/db/fts/fts_spec.h"
#include "mongo/db/index/fts_access_method.h"
#include "mongo/stdx/memory.h"
namespace mongo {
Status TextMatchExpression::init(OperationContext* opCtx,
const NamespaceString& nss,
TextParams params) {
_ftsQuery.setQuery(std::move(params.query));
_ftsQuery.setLanguage(std::move(params.language));
_ftsQuery.setCaseSensitive(params.caseSensitive);
_ftsQuery.setDiacriticSensitive(params.diacriticSensitive);
fts::TextIndexVersion version;
{
// Find text index.
ScopedTransaction transaction(opCtx, MODE_IS);
AutoGetDb autoDb(opCtx, nss.db(), MODE_IS);
Lock::CollectionLock collLock(opCtx->lockState(), nss.ns(), MODE_IS);
Database* db = autoDb.getDb();
if (!db) {
return {ErrorCodes::IndexNotFound,
str::stream() << "text index required for $text query (no such collection '"
<< nss.ns()
<< "')"};
}
Collection* collection = db->getCollection(nss);
if (!collection) {
return {ErrorCodes::IndexNotFound,
str::stream() << "text index required for $text query (no such collection '"
<< nss.ns()
<< "')"};
}
std::vector<IndexDescriptor*> idxMatches;
collection->getIndexCatalog()->findIndexByType(opCtx, IndexNames::TEXT, idxMatches);
if (idxMatches.empty()) {
return {ErrorCodes::IndexNotFound, "text index required for $text query"};
}
if (idxMatches.size() > 1) {
return {ErrorCodes::IndexNotFound, "more than one text index found for $text query"};
}
invariant(idxMatches.size() == 1);
IndexDescriptor* index = idxMatches[0];
const FTSAccessMethod* fam =
static_cast<FTSAccessMethod*>(collection->getIndexCatalog()->getIndex(index));
invariant(fam);
// Extract version and default language from text index.
version = fam->getSpec().getTextIndexVersion();
if (_ftsQuery.getLanguage().empty()) {
_ftsQuery.setLanguage(fam->getSpec().defaultLanguage().str());
}
}
Status parseStatus = _ftsQuery.parse(version);
if (!parseStatus.isOK()) {
return parseStatus;
}
return setPath("_fts");
}
std::unique_ptr<MatchExpression> TextMatchExpression::shallowClone() const {
auto expr = stdx::make_unique<TextMatchExpression>();
// We initialize _ftsQuery here directly rather than calling init(), to avoid needing to examine
// the index catalog.
expr->_ftsQuery = _ftsQuery;
invariantOK(expr->setPath("_fts"));
if (getTag()) {
expr->setTag(getTag()->clone());
}
return std::move(expr);
}
} // namespace mongo
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