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// expression_array.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 <vector>
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonmisc.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_leaf.h"
namespace mongo {
/**
* this SHOULD extend from ArrayMatchingMatchExpression
* the only reason it can't is
> db.foo.insert( { x : 5 } )
> db.foo.insert( { x : [5] } )
> db.foo.find( { x : { $all : [ 5 ] } } )
{ "_id" : ObjectId("5162b5c3f98a76ce1e70ed0c"), "x" : 5 }
{ "_id" : ObjectId("5162b5c5f98a76ce1e70ed0d"), "x" : [ 5 ] }
* the { x : 5} doc should NOT match
*
*/
class AllMatchExpression : public MatchExpression {
public:
AllMatchExpression() : MatchExpression( ARRAY, ALL ){}
Status init( const StringData& path );
ArrayFilterEntries* getArrayFilterEntries() { return &_arrayEntries; }
virtual bool matches( const MatchableDocument* doc, MatchDetails* details = 0 ) const;
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
bool equivalent( const MatchExpression* other ) const;
private:
bool _match( const BSONElementSet& all ) const;
StringData _path;
ArrayFilterEntries _arrayEntries;
};
class ArrayMatchingMatchExpression : public MatchExpression {
public:
ArrayMatchingMatchExpression( MatchType matchType ) : MatchExpression( ARRAY, matchType ){}
virtual ~ArrayMatchingMatchExpression(){}
virtual bool matches( const MatchableDocument* doc, MatchDetails* details ) const;
/**
* @param e - has to be an array. calls matchesArray with e as an array
*/
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual bool matchesArray( const BSONObj& anArray, MatchDetails* details ) const = 0;
bool equivalent( const MatchExpression* other ) const;
protected:
StringData _path;
};
class ElemMatchObjectMatchExpression : public ArrayMatchingMatchExpression {
public:
ElemMatchObjectMatchExpression() : ArrayMatchingMatchExpression( ELEM_MATCH_OBJECT ){}
Status init( const StringData& path, const MatchExpression* sub );
bool matchesArray( const BSONObj& anArray, MatchDetails* details ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
virtual size_t numChildren() const { return 1; }
virtual const MatchExpression* getChild( size_t i ) const { return _sub.get(); }
private:
boost::scoped_ptr<const MatchExpression> _sub;
};
class ElemMatchValueMatchExpression : public ArrayMatchingMatchExpression {
public:
ElemMatchValueMatchExpression() : ArrayMatchingMatchExpression( ELEM_MATCH_VALUE ){}
virtual ~ElemMatchValueMatchExpression();
Status init( const StringData& path );
Status init( const StringData& path, const MatchExpression* sub );
void add( const MatchExpression* sub );
bool matchesArray( const BSONObj& anArray, MatchDetails* details ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
virtual size_t numChildren() const { return _subs.size(); }
virtual const MatchExpression* getChild( size_t i ) const { return _subs[i]; }
private:
bool _arrayElementMatchesAll( const BSONElement& e ) const;
std::vector< const MatchExpression* > _subs;
};
/**
* i'm suprised this isn't a regular AllMatchExpression
*/
class AllElemMatchOp : public MatchExpression {
public:
AllElemMatchOp() : MatchExpression( ARRAY, ALL ){}
virtual ~AllElemMatchOp();
Status init( const StringData& path );
void add( const ArrayMatchingMatchExpression* expr );
virtual bool matches( const MatchableDocument* doc, MatchDetails* details ) const;
/**
* @param e has to be an array
*/
virtual bool matchesSingleElement( const BSONElement& e ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
virtual bool equivalent( const MatchExpression* other ) const;
private:
bool _allMatch( const BSONObj& anArray ) const;
StringData _path;
std::vector< const ArrayMatchingMatchExpression* > _list;
};
class SizeMatchExpression : public ArrayMatchingMatchExpression {
public:
SizeMatchExpression() : ArrayMatchingMatchExpression( SIZE ){}
Status init( const StringData& path, int size );
virtual bool matchesArray( const BSONObj& anArray, MatchDetails* details ) const;
virtual void debugString( StringBuilder& debug, int level ) const;
virtual bool equivalent( const MatchExpression* other ) const;
private:
int _size; // >= 0 real, < 0, nothing will match
};
}
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