Class Assignment

    • Field Detail

      • idNumber

        static final java.util.concurrent.atomic.AtomicInteger idNumber
      • d

        public final IntVar[] d
        It specifies a list of variables d.
      • shiftD

        public int shiftD
        It specifies a shift applied to variables d.
      • ds

        java.util.Map<IntVar,​java.lang.Integer> ds
      • x

        public IntVar[] x
        It specifies a list of variables x.
      • shiftX

        public int shiftX
        It specifies a shift applied to variables x.
      • xs

        java.util.Map<IntVar,​java.lang.Integer> xs
      • variableQueue

        java.util.LinkedHashSet<IntVar> variableQueue
      • firstConsistencyCheck

        boolean firstConsistencyCheck
      • firstConsistencyLevel

        int firstConsistencyLevel
    • Constructor Detail

      • Assignment

        public Assignment​(IntVar[] xs,
                          IntVar[] ds,
                          int shiftX,
                          int shiftD)
        It enforces the relationship x[d[i]-shiftX]=i+shiftD and d[x[i]-shiftD]=i+shiftX.
        Parameters:
        xs - array of variables x
        ds - array of variables d
        shiftX - a shift of indexes in X array.
        shiftD - a shift of indexes in D array.
      • Assignment

        public Assignment​(java.util.List<? extends IntVar> xs,
                          java.util.List<? extends IntVar> ds,
                          int shiftX,
                          int shiftD)
        It enforces the relationship x[d[i]-shiftX]=i+shiftD and d[x[i]-shiftD]=i+shiftX.
        Parameters:
        xs - arraylist of variables x
        ds - arraylist of variables d
        shiftX - shift for parameter xs
        shiftD - shift for parameter ds
      • Assignment

        public Assignment​(java.util.List<? extends IntVar> xs,
                          java.util.List<? extends IntVar> ds)
        It constructs an Assignment constraint with shift equal 0. It enforces relation - d[x[j]] = i and x[d[i]] = j.
        Parameters:
        xs - arraylist of x variables
        ds - arraylist of d variables
      • Assignment

        public Assignment​(java.util.List<? extends Var> xs,
                          java.util.List<? extends Var> ds,
                          int min)
        It enforces the relationship x[d[i]-min]=i+min and d[x[i]-min]=i+min.
        Parameters:
        xs - arraylist of variables x
        ds - arraylist of variables d
        min - shift
      • Assignment

        public Assignment​(IntVar[] xs,
                          IntVar[] ds)
        It constructs an Assignment constraint with shift equal 0. It enforces relation - d[x[i]] = i and x[d[i]] = i.
        Parameters:
        xs - array of x variables
        ds - array of d variables
      • Assignment

        public Assignment​(IntVar[] xs,
                          IntVar[] ds,
                          int min)
        It enforces the relationship x[d[i]-min]=i+min and d[x[i]-min]=i+min.
        Parameters:
        xs - array of variables x
        ds - array of variables d
        min - shift
    • Method Detail

      • removeLevel

        public void removeLevel​(int level)
        Description copied from interface: Stateful
        This function is called in case of the backtrack, so a constraint can clear the queue of changed variables which is no longer valid. This function is called *before* all timestamps, variables, mutablevariables have reverted to their previous value.
        Specified by:
        removeLevel in interface Stateful
        Parameters:
        level - the level which is being removed.
      • consistency

        public void consistency​(Store store)
        Description copied from class: Constraint
        It is a (most probably incomplete) consistency function which removes the values from variables domains. Only values which do not have any support in a solution space are removed.
        Specified by:
        consistency in class Constraint
        Parameters:
        store - constraint store within which the constraint consistency is being checked.
      • satisfied

        public boolean satisfied()
        Description copied from interface: SatisfiedPresent
        It checks if the constraint is satisfied. It can return false even if constraint is satisfied but not all variables in its scope are grounded. It needs to return true if all variables in its scope are grounded and constraint is satisfied.

        Implementations of this interface for constraints that are not PrimitiveConstraint may require constraint imposition and consistency check as a requirement to work correctly.

        Specified by:
        satisfied in interface SatisfiedPresent
        Returns:
        true if constraint is possible to verify that it is satisfied.
      • impose

        public void impose​(Store store)
        Description copied from class: Constraint
        It imposes the constraint in a given store.
        Overrides:
        impose in class Constraint
        Parameters:
        store - the constraint store to which the constraint is imposed to.
      • queueVariable

        public void queueVariable​(int level,
                                  Var var)
        Description copied from class: Constraint
        This is a function called to indicate which variable in a scope of constraint has changed. It also indicates a store level at which the change has occurred.
        Overrides:
        queueVariable in class Constraint
        Parameters:
        level - the level of the store at which the change has occurred.
        var - variable which has changed.
      • toString

        public java.lang.String toString()
        Description copied from class: Constraint
        It produces a string representation of a constraint state.
        Overrides:
        toString in class Constraint