Package org.optaplanner.core.api.domain.solution.cloner

Interface SolutionCloner<Solution_>

Type Parameters:

Solution_ - the solution type, the class with the PlanningSolution annotation

All Known Subinterfaces:

PlanningSolution.NullSolutionCloner

All Known Implementing Classes:

FieldAccessingSolutionCloner

public interface SolutionCloner<Solution_>

Clones a PlanningSolution during planning. Used to remember the state of a good PlanningSolution so it can be recalled at a later time when the original PlanningSolution is already modified. Also used in population based heuristics to increase or repopulate the population.

Planning cloning is hard: avoid doing it yourself.

An implementing class must be thread-safe after initialization.

Method Summary

Modifier and Type	Method	Description
Solution_	cloneSolution(Solution_ original)	Does a planning clone.

Method Detail

cloneSolution

Solution_ cloneSolution(Solution_ original)

Does a planning clone. The returned PlanningSolution clone must fulfill these requirements:

• The clone must represent the same planning problem. Usually it reuses the same instances of the problem facts and problem fact collections as the original.
• The clone must have the same (equal) score as the original.
• The clone must use different, cloned instances of the entities and entity collections. If a cloned entity changes, the original must remain unchanged. If an entity is added or removed in a cloned PlanningSolution, the original PlanningSolution must remain unchanged.

Note that a class might support more than 1 clone method: planning clone is just one of them.

This method is thread-safe.

Parameters:

original - never null, the original PlanningSolution

Returns:

never null, the cloned PlanningSolution