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// expression_where_noop.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.
*/
#define MONGO_PCH_WHITELISTED
#include "mongo/platform/basic.h"
#include "mongo/pch.h"
#undef MONGO_PCH_WHITELISTED
#include "mongo/base/init.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_parser.h"
namespace mongo {
using std::auto_ptr;
using std::string;
/**
* Bogus no-op $where match expression to parse $where in mongos,
* since mongos doesn't have script engine to compile JS functions.
*
* Linked into mongos, instead of the real WhereMatchExpression.
*/
class WhereNoOpMatchExpression : public MatchExpression {
public:
WhereNoOpMatchExpression() : MatchExpression( WHERE ){ }
virtual ~WhereNoOpMatchExpression(){}
Status init( const StringData& theCode );
virtual bool matches( const MatchableDocument* doc, MatchDetails* details = 0 ) const {
return false;
}
virtual bool matchesSingleElement( const BSONElement& e ) const {
return false;
}
virtual MatchExpression* shallowClone() const {
WhereNoOpMatchExpression* e = new WhereNoOpMatchExpression();
e->init(_code);
if ( getTag() ) {
e->setTag(getTag()->clone());
}
return e;
}
virtual void debugString( StringBuilder& debug, int level = 0 ) const;
virtual void toBSON(BSONObjBuilder* out) const;
virtual bool equivalent( const MatchExpression* other ) const ;
virtual void resetTag() { setTag(NULL); }
private:
string _code;
};
Status WhereNoOpMatchExpression::init(const StringData& theCode ) {
if ( theCode.size() == 0 )
return Status( ErrorCodes::BadValue, "code for $where cannot be empty" );
_code = theCode.toString();
return Status::OK();
}
void WhereNoOpMatchExpression::debugString( StringBuilder& debug, int level ) const {
_debugAddSpace( debug, level );
debug << "$where (only in mongos)\n";
_debugAddSpace( debug, level + 1 );
debug << "code: " << _code << "\n";
}
void WhereNoOpMatchExpression::toBSON(BSONObjBuilder* out) const {
out->append("$where", _code);
}
bool WhereNoOpMatchExpression::equivalent( const MatchExpression* other ) const {
if ( matchType() != other->matchType() )
return false;
const WhereNoOpMatchExpression* noopOther = static_cast<const WhereNoOpMatchExpression*>(other);
return _code == noopOther->_code;
}
// -----------------
WhereCallbackNoop::WhereCallbackNoop() {
}
StatusWithMatchExpression WhereCallbackNoop::parseWhere(const BSONElement& where) const {
auto_ptr<WhereNoOpMatchExpression> exp( new WhereNoOpMatchExpression() );
if ( where.type() == String || where.type() == Code ) {
Status s = exp->init( where.valuestr() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( exp.release() );
}
if ( where.type() == CodeWScope ) {
Status s = exp->init( where.codeWScopeCode() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( exp.release() );
}
return StatusWithMatchExpression( ErrorCodes::BadValue, "$where got bad type" );
}
}
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