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// expression.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/db/matcher/expression.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonmisc.h"
namespace mongo {
using std::string;
MatchExpression::MatchExpression(MatchType type) : _matchType(type) {}
string MatchExpression::toString() const {
StringBuilder buf;
debugString(buf, 0);
return buf.str();
}
void MatchExpression::_debugAddSpace(StringBuilder& debug, int level) const {
for (int i = 0; i < level; i++)
debug << " ";
}
bool MatchExpression::matchesBSON(const BSONObj& doc, MatchDetails* details) const {
BSONMatchableDocument mydoc(doc);
return matches(&mydoc, details);
}
void FalseMatchExpression::debugString(StringBuilder& debug, int level) const {
_debugAddSpace(debug, level);
debug << "$all: []\n";
}
void FalseMatchExpression::serialize(BSONObjBuilder* out) const {
// Our query language has no "always false" operator aside from a $all with no children, so use
// that as a proxy here.
BSONObjBuilder child(out->subobjStart(_path));
BSONArrayBuilder allChild(child.subarrayStart("$all"));
allChild.doneFast();
child.doneFast();
}
}
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