Package org.jacop.satwrapper

Class SatChangesListener

java.lang.Object
org.jacop.satwrapper.SatChangesListener
All Implemented Interfaces:
SolverComponent, AssertionListener, BackjumpListener, PropagateListener
public final class SatChangesListener extends Object implements AssertionListener, PropagateListener, BackjumpListener
this class listens to changes in literals in SAT solver, and reminds what changes this implies for CP variables
Version:
4.10

  • Field Details

    • wrapper

      private SatWrapper wrapper

    • core

      private Core core

    • excludedValues

      private Set<Integer>[] excludedValues

    • upperBounds

      private Integer[] upperBounds

    • lowerBounds

      private Integer[] lowerBounds

    • intVarsToUpdate

      private BitSet intVarsToUpdate

    • booleanVarsToUpdate

      private Set<BooleanVar> booleanVarsToUpdate

  • Constructor Details

    • SatChangesListener

      public SatChangesListener()

  • Method Details

    • clear

      public void clear()
      clears all sets, so that elements occurring in them later result only from later events

    • onPropagate

      public void onPropagate(int literal, int clauseId)
      Description copied from interface: PropagateListener
      called when a propagation occurs
      Specified by:
      onPropagate in interface PropagateListener
      Parameters:
      literal - the literal propagated
      clauseId - the unique ID of the unit clause

    • onAssertion

      public void onAssertion(int literal, int level)
      Description copied from interface: AssertionListener
      Called when a variable is set
      Specified by:
      onAssertion in interface AssertionListener
      Parameters:
      literal - the literal that is set propagation, false otherwise
      level - the search level

    • onBackjump

      public void onBackjump(int oldLevel, int newLevel)
      clear on backjump
      Specified by:
      onBackjump in interface BackjumpListener
      Parameters:
      oldLevel - the level at which the solver was before backtracking
      newLevel - the level to which the solver backtracks

    • onRestart

      public void onRestart(int oldLevel)
      Description copied from interface: BackjumpListener
      called when the solver restarts.

      components that want to be warned about restarts should put themselves in Core.restartModules.

      Specified by:
      onRestart in interface BackjumpListener
      Parameters:
      oldLevel - the level at which the solver was before restarting

    • onAssertion

      private void onAssertion(int literal)
      this should be called every time a new boolean variable representing a CP proposition is asserted, but preferably only once per variable, so that it can later update the CP variables domains
      Parameters:
      literal - the boolean literal that has been asserted

    • updateCpVariables

      public void updateCpVariables(int storeLevel)
      Using all data accumulated since last clear(), update the domain of the given CP variable
      Parameters:
      storeLevel - the current level of the store

    • ensureAccess

      public void ensureAccess(IntVar cpVar)
      gets sure we won't have a NullPointerException
      Parameters:
      cpVar - the CP variable we are about to access

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • initialize

      public void initialize(Core core)
      Description copied from interface: SolverComponent
      initializes the component with the given solver. May be called only once. This method must register the component to the solver for the run.
      Specified by:
      initialize in interface SolverComponent
      Parameters:
      core - core component to initialize

    • initialize

      public void initialize(SatWrapper wrapper)