content: /**
   * Copyright (c) 2016-2017, the Alpha Team.
   * All rights reserved.
   *
   * Additional changes made by Siemens.
   *
   * 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;
  
  import at.ac.tuwien.kr.alpha.api.Solver;
  import at.ac.tuwien.kr.alpha.api.config.SystemConfig;
  import at.ac.tuwien.kr.alpha.core.common.AtomStore;
  import at.ac.tuwien.kr.alpha.core.grounder.Grounder;
  import at.ac.tuwien.kr.alpha.core.solver.heuristics.HeuristicsConfiguration;
  import at.ac.tuwien.kr.alpha.core.solver.heuristics.HeuristicsConfigurationBuilder;
  
  import java.util.Random;
  
  public final class SolverFactory {
  	
  	public static Solver getInstance(SystemConfig config, AtomStore atomStore, Grounder grounder) {
  		final String solverName = config.getSolverName();
  		final String nogoodStoreName = config.getNogoodStoreName();
  		final Random random = new Random(config.getSeed());
  		final boolean debugInternalChecks = config.isDebugInternalChecks();
  		final HeuristicsConfiguration heuristicsConfiguration = buildHeuristicsConfiguration(config);
  		final WritableAssignment assignment = new TrailAssignment(atomStore, debugInternalChecks);
  
  		NoGoodStore store;
  
  		switch (nogoodStoreName.toLowerCase()) {
  			case "naive":
  				store = new NaiveNoGoodStore(assignment);
  				break;
  			case "alpharoaming":
  				store = new NoGoodStoreAlphaRoaming(assignment, debugInternalChecks);
  				break;
  			default:
  				throw new IllegalArgumentException("Unknown store requested.");
  		}
  
  		switch (solverName.toLowerCase()) {
  			case "naive" :
  				return new NaiveSolver(atomStore, grounder);
  			case "default":
  				return new DefaultSolver(atomStore, grounder, store, assignment, random, config, heuristicsConfiguration);
  		}
  		throw new IllegalArgumentException("Unknown solver requested.");
  	}
  
  	private static HeuristicsConfiguration buildHeuristicsConfiguration(SystemConfig config) {
  		HeuristicsConfigurationBuilder heuristicsConfigurationBuilder = HeuristicsConfiguration.builder();
  		heuristicsConfigurationBuilder.setHeuristic(config.getBranchingHeuristic());
  		heuristicsConfigurationBuilder.setMomsStrategy(config.getMomsStrategy());
  		heuristicsConfigurationBuilder.setReplayChoices(config.getReplayChoices());
  		return heuristicsConfigurationBuilder.build();
  	}
  }
  