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The optimization module of OpenDSE

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/**
 * OpenDSE is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 * 
 * OpenDSE is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with OpenDSE. If not, see http://www.gnu.org/licenses/.
 */
package net.sf.opendse.optimization;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import net.sf.opendse.model.Specification;
import net.sf.opendse.optimization.encoding.CommunicationLearn;
import net.sf.opendse.optimization.encoding.Encoding;
import net.sf.opendse.optimization.encoding.RoutingFilter;
import net.sf.opendse.optimization.encoding.common.ConstraintPreprocessing;

import org.opt4j.satdecoding.Constraint;
import org.opt4j.satdecoding.Literal;
import org.opt4j.satdecoding.Model;

import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * The {@code SATConstraints} objects initializes constraints and applies the
 * preprocessing.
 * 
 * @author martin.lukasiewycz
 *
 */
@Singleton
public class SATConstraints {

	protected final SpecificationWrapper specificationWrapper;
	protected final List constraints = new ArrayList();
	protected final List variables = new ArrayList();
	protected final ConstraintPreprocessing pp;
	protected boolean isInit = false;
	protected Encoding encoding;

	@Inject
	public SATConstraints(SpecificationWrapper specificationWrapper, Encoding encoding) {
		this(specificationWrapper, encoding, new ConstraintPreprocessing(true, true,
				new Encoding.VariableComparator(), null, true));
	}

	public SATConstraints(SpecificationWrapper specificationWrapper, Encoding encoding, ConstraintPreprocessing pp) {
		super();
		this.specificationWrapper = specificationWrapper;
		this.encoding = encoding;
		this.pp = pp;
	}

	public synchronized List getConstraints() {
		if (!isInit) {
			init();
		}
		return constraints;
	}

	public synchronized List getVariables() {
		if (!isInit) {
			init();
		}
		return variables;
	}

	public synchronized void init() {
		if (!isInit) {
			Specification specification = specificationWrapper.getSpecification();
			RoutingFilter.filter(specification);

			Collection constraints = encoding.toConstraints(specification);

			CommunicationLearn clearn = new CommunicationLearn();
			Set learned = clearn.learn(constraints);
			for (Literal literal : learned) {
				Constraint constraint = new Constraint("=", 1);
				constraint.add(literal);
				constraints.add(constraint);
			}
			/*
			 * for (Constraint constraint : constraints) {
			 * System.out.println(constraint); }
			 */
			// this.constraints.addAll(constraints);
			this.constraints.addAll(pp.process(constraints));

			Set variables = new HashSet();
			for (Constraint constraint : this.constraints) {
				for (Literal literal : constraint.getLiterals()) {
					variables.add(literal.variable());
				}
			}
			this.variables.addAll(variables);

			isInit = true;
		}
	}

	public synchronized Model decorate(Model model) {
		if (!isInit) {
			init();
		}
		// return model;
		return pp.decorate(model);
	}

	public ConstraintPreprocessing getPreprocessing() {
		return pp;
	}

}
    

    

    

            

    

            



    
    






    
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