gistfile1.txt

@Override
public Iterator<Tuple> executeBackendQuery(CustomQuery customQuery, QueryParameters queryParameters, EntityKeyMetadata[] metadatas) {
		
	//e.g. "db.Item.find({ foo : bar })
	String query = customQuery.getSQL();
		
	// parse via Parboiled
	QueryDescriptor qd = new QueryParser().parse( query );
	
	//qd.collection = "Item"
	//qd.payload = "{ foo : bar }"
	//qd.operation = Ops.FIND
	
	DBCollection collection = provider.getDatabase().getCollection( qd.getCollection() ); 
	
	if ( qd.getOperation == Ops.FIND ) {
		DBObject queryObj = JSON.parse( qd.getPayload() );
		DBObject proj = JSON.parse( qd.getProjection() );
		DBCursor cursor = collection.find( queryObj, proj );
	}
	// in case of executeUpdate()
	else if ( qd.getOperation() = Ops.INSERT ) {
		collection.insert( qd.getQuery() );
	}
	else if () {
		...
	}
}