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The optimization module of OpenDSE
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 * Copyright (c) 2015 OpenDSE
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package net.sf.opendse.optimization.encoding;

import static net.sf.opendse.optimization.encoding.variables.Variables.n;
import static net.sf.opendse.optimization.encoding.variables.Variables.p;

import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import net.sf.opendse.model.ICommunication;
import net.sf.opendse.optimization.encoding.common.BinaryReachability;
import net.sf.opendse.optimization.encoding.variables.CommunicationVariable;

import org.apache.commons.collections15.functors.InstantiateFactory;
import org.apache.commons.collections15.map.LazyMap;
import org.opt4j.satdecoding.Constraint;
import org.opt4j.satdecoding.Literal;

/**
 * The {@code CommunicationLearn} learns units from the communication variables.
 * This is done by a {@link BinaryReachability} search.
 * 
 * 
 * @author Martin Lukasiewycz
 * 
 */
public class CommunicationLearn {

	@SuppressWarnings({ "unchecked", "rawtypes" })
	public Set learn(Collection constraints) {
		Set learned = new HashSet();

		Map> map = LazyMap.decorate(new HashMap>(),
				new InstantiateFactory(HashSet.class));

		Map> cvars = LazyMap.decorate(
				new HashMap>(), new InstantiateFactory(HashSet.class));

		for (Constraint constraint : constraints) {
			for (Literal literal : constraint.getLiterals()) {
				Object var = literal.variable();
				map.get(var).add(constraint);
				if (var instanceof CommunicationVariable) {
					CommunicationVariable cvar = (CommunicationVariable) var;
					cvars.get(cvar.getCommunication()).add(cvar);
				}
			}
		}

		for (ICommunication communication : cvars.keySet()) {
			// System.out.println("communication "+communication);
			Set cs = new HashSet();

			Set