/*
 * Copyright (C) 2014-2015 Alexander Nutz (nutz@informatik.uni-freiburg.de)
 * Copyright (C) 2015 University of Freiburg
 * 
 * This file is part of the ULTIMATE Automata Library.
 * 
 * The ULTIMATE Automata Library 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.
 * 
 * The ULTIMATE Automata Library 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 the ULTIMATE Automata Library. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Additional permission under GNU GPL version 3 section 7:
 * If you modify the ULTIMATE Automata Library, or any covered work, by linking
 * or combining it with Eclipse RCP (or a modified version of Eclipse RCP),
 * containing parts covered by the terms of the Eclipse Public License, the
 * licensors of the ULTIMATE Automata Library grant you additional permission
 * to convey the resulting work.
 */
package de.uni_freiburg.informatik.ultimate.automata.alternating;

import java.util.Collection;

import de.uni_freiburg.informatik.ultimate.util.HashUtils;

/**
 * A collection of states.
 * 
 * @author Alexander Nutz (nutz@informatik.uni-freiburg.de)
 * @param <STATE>
 *            state type
 */
public class CompoundState<STATE> {
	private final Collection<STATE> mStates;

	/**
	 * Constructor.
	 * 
	 * @param states
	 *            states
	 */
	public CompoundState(final Collection<STATE> states) {
		mStates = states;
	}

	@Override
	public String toString() {
		return mStates.toString();
	}

	public Collection<STATE> getStates() {
		return mStates;
	}

	@Override
	public boolean equals(final Object obj) {
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		return ((CompoundState<?>) obj).getStates().equals(this.getStates());
	}

	@Override
	public int hashCode() {
		int hashCode = 0;
		for (final STATE state : mStates) {
			hashCode += HashUtils.hashJenkins(31, state);
		}
		return hashCode;
	}
}