How to add a new heuristic?

[Matteio]

Hi, I am working with pddl4j on a planning problem, and the goal is to create a new ad hoc heuristic for the problem at hand. On the documentation I saw there is a guide on how to create the planner, I wanted to ask you if there was a guide on how to add a new heuristic, thanks.

[pellierd]

Hi,

If you want to develop your own heuristic you can use the interface Heuristic and its subclasses. For a state based heuristic used instead StateHeuristic and its abstract subclass AbstractStateHeuristic. You just have to implement the method estimate(State) that returns a estimation of the distance to the goal from the state in parameter.

[Matteio]

Thank you! @pellierd