question: checks if a node at a specific position exists . concode_field_sep Map<Point,RailwayNode> __nodeMap concode_field_sep void add concode_elem_sep void drawAllNodes concode_elem_sep RailwayNode createNode concode_elem_sep RailwayNode createNode concode_elem_sep RailwayNode createNode concode_elem_sep void removeNodesWithoutNeighbors concode_elem_sep boolean doesExist concode_elem_sep RailwayNode getNodeByPosition concode_elem_sep void unlockAllSignals
target: boolean function ( Point arg0 ) { return __nodeMap . containsKey ( arg0 ) ; }