EditPolicies are GEF specific; we recommend you read some GEF documentation before playing with these classes. See DevDocEditPolicies to learn more about them.
Feedback EditPolicies allow visual indications of possible actions when one hovers over an element or tries to drag&drop something on them. Our PathNodeNonResizableEditPolicy (bad name; doesn't make them non resizable, that's the PathNodeComponentEditPolicy's job.) delegates visual indicates to the actual figures via setSelected() and setHover()