Class InputOrderSelect<T extends Var>

java.lang.Object
org.jacop.search.InputOrderSelect<T>
Type Parameters:
T - type of variable being used in the search.
All Implemented Interfaces:
SelectChoicePoint<T>

public class InputOrderSelect<T extends Var> extends Object implements SelectChoicePoint<T>
It is simple input order selector of variables.
Version:
4.9
  • Field Details

    • debugAll

      static final boolean debugAll
      See Also:
    • searchVariables

      T extends Var[] searchVariables
    • valueOrdering

      Indomain<T extends Var> valueOrdering
    • currentIndex

      TimeStamp<Integer> currentIndex
    • position

      public Map<T extends Var,Integer> position
      It stores the original positions of variables to be used for input order tie-breaking.
  • Constructor Details

    • InputOrderSelect

      public InputOrderSelect(Store store, T[] variables, Indomain<T> indomain)
      It constructs an input order selection procedure.
      Parameters:
      store - a constraint store in which variables resides.
      variables - a list of variables which must be assigned a value by search.
      indomain - the indomain heuristic for assigning values to variables.
  • Method Details

    • getChoiceVariable

      public T getChoiceVariable(int index)
      It returns the variable which is the base on the next choice point. Only if choice is of an X = C type. This function returns null if all variables have a value assigned or a choice point based on other type of constraint is being selected. The parameter index is the last variable which have been return by this SelectChoicePoint object which has not been backtracked upon yet.
      Specified by:
      getChoiceVariable in interface SelectChoicePoint<T extends Var>
      Parameters:
      index - the position of the last variable in selection choice point heuristic.
      Returns:
      variable based on which the choice needs to be created.
    • getChoiceValue

      public int getChoiceValue()
      It returns a value which is the base of the next choice point. Only if choice is of an X = C type.
      Specified by:
      getChoiceValue in interface SelectChoicePoint<T extends Var>
      Returns:
      value used in the choice point (value).
    • getChoiceConstraint

      public PrimitiveConstraint getChoiceConstraint(int index)
      It always returns null as choice point is obtained by getChoiceVariable and getChoiceValue.
      Specified by:
      getChoiceConstraint in interface SelectChoicePoint<T extends Var>
      Parameters:
      index - the position of the last variable returned by selection choice point heuristic.
      Returns:
      primitive constraint which is a base of a choice point.
    • getVariablesMapping

      public Map<T,Integer> getVariablesMapping()
      It returns the variables for which assignment in the solution is given.
      Specified by:
      getVariablesMapping in interface SelectChoicePoint<T extends Var>
      Returns:
      mapping of variables to the positions in the variables array.
    • getIndex

      public int getIndex()
      It returns the current index. Supplying this value in the next invocation of select will make search for next variable faster without comprimising efficiency.
      Specified by:
      getIndex in interface SelectChoicePoint<T extends Var>
      Returns:
      internal position of the last variable chosen to be the base of the choice point.
    • toString

      public String toString()
      Overrides:
      toString in class Object