Пример #1
0
 void IndexSpec::getKeys( const BSONObj &obj, BSONObjSetDefaultOrder &keys ) const {
     if ( _indexType.get() ){
         _indexType->getKeys( obj , keys );
         return;
     }
     vector<const char*> fieldNames( _fieldNames );
     vector<BSONElement> fixed( _fixed );
     _getKeys( fieldNames , fixed , obj, keys );
     if ( keys.empty() )
         keys.insert( _nullKey );
 }
Пример #2
0
    void IndexSpec::_getKeys( vector<const char*> fieldNames , vector<BSONElement> fixed , const BSONObj &obj, BSONObjSetDefaultOrder &keys ) const {
        BSONElement arrElt;
        unsigned arrIdx = ~0;
        for( unsigned i = 0; i < fieldNames.size(); ++i ) {
            if ( *fieldNames[ i ] == '\0' )
                continue;
            BSONElement e = obj.getFieldDottedOrArray( fieldNames[ i ] );
            if ( e.eoo() )
                e = _nullElt; // no matching field
            if ( e.type() != Array )
                fieldNames[ i ] = ""; // no matching field or non-array match
            if ( *fieldNames[ i ] == '\0' )
                fixed[ i ] = e; // no need for further object expansion (though array expansion still possible)
            if ( e.type() == Array && arrElt.eoo() ) { // we only expand arrays on a single path -- track the path here
                arrIdx = i;
                arrElt = e;
            }
            // enforce single array path here
            uassert( 10088 ,  "cannot index parallel arrays", e.type() != Array || e.rawdata() == arrElt.rawdata() );
        }

        bool allFound = true; // have we found elements for all field names in the key spec?
        for( vector<const char*>::const_iterator i = fieldNames.begin(); i != fieldNames.end(); ++i ){
            if ( **i != '\0' ){
                allFound = false;
                break;
            }
        }

        bool insertArrayNull = false;

        if ( allFound ) {
            if ( arrElt.eoo() ) {
                // no terminal array element to expand
                BSONObjBuilder b(_sizeTracker);
                for( vector< BSONElement >::iterator i = fixed.begin(); i != fixed.end(); ++i )
                    b.appendAs( *i, "" );
                keys.insert( b.obj() );
            } 
            else {
                // terminal array element to expand, so generate all keys
                BSONObjIterator i( arrElt.embeddedObject() );
                if ( i.more() ){
                    while( i.more() ) {
                        BSONObjBuilder b(_sizeTracker);
                        for( unsigned j = 0; j < fixed.size(); ++j ) {
                            if ( j == arrIdx )
                                b.appendAs( i.next(), "" );
                            else
                                b.appendAs( fixed[ j ], "" );
                        }
                        keys.insert( b.obj() );
                    }
                }
                else if ( fixed.size() > 1 ){
                    insertArrayNull = true;
                }
            }
        } else {
            // nonterminal array element to expand, so recurse
            assert( !arrElt.eoo() );
            BSONObjIterator i( arrElt.embeddedObject() );
            if ( i.more() ){
                while( i.more() ) {
                    BSONElement e = i.next();
                    if ( e.type() == Object ){
                        _getKeys( fieldNames, fixed, e.embeddedObject(), keys );
                    }
                }
            }
            else {
                insertArrayNull = true;
            }
        }
        
        if ( insertArrayNull ) {
            // x : [] - need to insert undefined
            BSONObjBuilder b(_sizeTracker);
            for( unsigned j = 0; j < fixed.size(); ++j ) {
                if ( j == arrIdx ){
                    b.appendUndefined( "" );
                }
                else {
                    BSONElement e = fixed[j];
                    if ( e.eoo() )
                        b.appendNull( "" );
                    else
                        b.appendAs( e , "" );
                }
            }
            keys.insert( b.obj() );
        }
    }