content: /**
   * Copyright (c) 2017 Siemens AG
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * 1) Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 
   * 2) Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package at.ac.tuwien.kr.alpha.core.solver.heuristics;
  
  import at.ac.tuwien.kr.alpha.core.common.Assignment;
  import at.ac.tuwien.kr.alpha.core.solver.ChoiceManager;
  import at.ac.tuwien.kr.alpha.core.solver.heuristics.activity.BodyActivityProviderFactory.BodyActivityType;
  
  import static at.ac.tuwien.kr.alpha.core.programs.atoms.Literals.atomOf;
  
  import java.util.Random;
  
  /**
   * A variant of {@link DependencyDrivenHeuristic} that counts the activity of non-body-representing atoms towards bodies of rules in which they occur.
   */
  public class AlphaActiveRuleHeuristic extends DependencyDrivenHeuristic {
  
  	public AlphaActiveRuleHeuristic(Assignment assignment, ChoiceManager choiceManager, int decayPeriod, double decayFactor, Random random) {
  		super(assignment, choiceManager, decayPeriod, decayFactor, random, BodyActivityType.DEFAULT);
  	}
  
  	public AlphaActiveRuleHeuristic(Assignment assignment, ChoiceManager choiceManager, Random random) {
  		super(assignment, choiceManager, random);
  	}
  
  	@Override
  	protected void incrementActivityCounter(int literal) {
  		int atom = atomOf(literal);
  		if (choiceManager.isAtomChoice(atom)) {
  			activityCounters.compute(atom, (k, v) -> (v == null ? DEFAULT_ACTIVITY : v) + 1);
  		} else {
  			for (int body : atomsToBodiesAtoms.get(atom)) {
  				activityCounters.compute(body, (k, v) -> (v == null ? DEFAULT_ACTIVITY : v) + 1);
  			}
  		}
  	}
  
  }
  