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// expression_leaf.h
/**
* 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/>.
*/
#pragma once
#include <pcrecpp.h>
#include <boost/scoped_ptr.hpp>
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonmisc.h"
#include "mongo/db/matcher/expression.h"
namespace mongo {
class LeafMatchExpression : public MatchExpression {
public:
LeafMatchExpression() {
_allHaveToMatch = false;
}
virtual ~LeafMatchExpression(){}
virtual bool matches( const BSONObj& doc, MatchDetails* details = 0 ) const;
virtual bool matchesSingleElement( const BSONElement& e ) const = 0;
protected:
StringData _path;
bool _allHaveToMatch;
};
// -----
class ComparisonMatchExpression : public LeafMatchExpression {
public:
enum Type { LTE, LT, EQ, GT, GTE, NE };
Status init( const StringData& path, Type type, const BSONElement& rhs );
virtual ~ComparisonMatchExpression(){}
virtual Type getType() const { return _type; }
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level = 0 ) const;
protected:
bool _invertForNE( bool normal ) const;
private:
Type _type;
BSONElement _rhs;
};
class RegexMatchExpression : public LeafMatchExpression {
public:
/**
* Maximum pattern size which pcre v8.3 can do matches correctly with
* LINK_SIZE define macro set to 2 @ pcre's config.h (based on
* experiments)
*/
static const size_t MaxPatternSize = 32764;
Status init( const StringData& path, const StringData& regex, const StringData& options );
Status init( const StringData& path, const BSONElement& e );
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
std::string _regex;
std::string _flags;
boost::scoped_ptr<pcrecpp::RE> _re;
};
class ModMatchExpression : public LeafMatchExpression {
public:
Status init( const StringData& path, int divisor, int remainder );
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
int _divisor;
int _remainder;
};
class ExistsMatchExpression : public LeafMatchExpression {
public:
Status init( const StringData& path, bool exists );
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
bool _exists;
};
class TypeMatchExpression : public MatchExpression {
public:
Status init( const StringData& path, int type );
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual bool matches( const BSONObj& doc, MatchDetails* details = 0 ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
bool _matches( const StringData& path, const BSONObj& doc, MatchDetails* details = 0 ) const;
StringData _path;
int _type;
};
/**
* INTERNAL
* terrible name
* holds the entries of an $in or $all
* either scalars or regex
*/
class ArrayFilterEntries {
MONGO_DISALLOW_COPYING( ArrayFilterEntries );
public:
ArrayFilterEntries();
~ArrayFilterEntries();
Status addEquality( const BSONElement& e );
Status addRegex( RegexMatchExpression* expr );
const BSONElementSet& equalities() const { return _equalities; }
bool contains( const BSONElement& elem ) const { return _equalities.count(elem) > 0; }
size_t numRegexes() const { return _regexes.size(); }
RegexMatchExpression* regex( int idx ) const { return _regexes[idx]; }
bool hasNull() const { return _hasNull; }
bool singleNull() const { return size() == 1 && _hasNull; }
int size() const { return _equalities.size() + _regexes.size(); }
private:
bool _hasNull; // if _equalities has a jstNULL element in it
BSONElementSet _equalities;
std::vector<RegexMatchExpression*> _regexes;
};
/**
* query operator: $in
*/
class InMatchExpression : public LeafMatchExpression {
public:
void init( const StringData& path );
ArrayFilterEntries* getArrayFilterEntries() { return &_arrayEntries; }
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
ArrayFilterEntries _arrayEntries;
};
class NinMatchExpression : public LeafMatchExpression {
public:
void init( const StringData& path );
ArrayFilterEntries* getArrayFilterEntries() { return _in.getArrayFilterEntries(); }
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
private:
InMatchExpression _in;
};
}
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