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The core artifact of AutomataLib. This library contains concrete implementations for many of the automaton model interfaces defined in the API artifact, as well as abstract base classes that facilitate implementing new automaton model classes. Note that concrete algorithms (traversal, reachability analysis etc.) are not in the scope of this artifact.

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/* Copyright (C) 2013-2014 TU Dortmund
 * This file is part of AutomataLib, http://www.automatalib.net/.
 * 
 * AutomataLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * AutomataLib 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 AutomataLib; if not, see
 * http://www.gnu.de/documents/lgpl.en.html.
 */
package net.automatalib.ts.comp;

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

import net.automatalib.commons.util.IPair;
import net.automatalib.ts.TransitionSystem;


public class TSComposition,
		TS2 extends TransitionSystem> implements
		TransitionSystem, I, IPair> {
	
	protected final TS1 ts1;
	protected final TS2 ts2;
	
	/**
	 * Constructor.
	 * @param ts1 first transition system
	 * @param ts2 second transition system
	 */
	public TSComposition(TS1 ts1,
			TS2 ts2) {
		this.ts1 = ts1;
		this.ts2 = ts2;
	}

	/*
	 * (non-Javadoc)
	 * @see de.ls5.ts.TransitionSystem#getInitialStates()
	 */
	@Override
	public Set> getInitialStates() {
		Collection init1 = ts1.getInitialStates();
		Collection init2 = ts2.getInitialStates();
		
		Set> result = new HashSet<>(init1.size() * init2.size());
		
		for(S1 s1 : init1) {
			for(S2 s2 : init2)
				result.add(new IPair<>(s1, s2));
		}
		
		return result;
	}

	/*
	 * (non-Javadoc)
	 * @see de.ls5.ts.TransitionSystem#getTransitions(java.lang.Object, java.lang.Object)
	 */
	@Override
	public Collection> getTransitions(IPair state, I input) {
		S1 s1 = state.first;
		S2 s2 = state.second;
		Collection trans1 = ts1.getTransitions(s1, input);
		Collection trans2 = ts2.getTransitions(s2, input);
		
		if(trans1.isEmpty() || trans2.isEmpty())
			return Collections.emptySet();
		
		List> result = new ArrayList<>(trans1.size() * trans2.size());
		
		for(T1 t1 : trans1) {
			for(T2 t2 : trans2) {
				result.add(new IPair<>(t1, t2));
			}
		}
		
		return result;
	}

	/*
	 * (non-Javadoc)
	 * @see de.ls5.ts.TransitionSystem#getSuccessor(java.lang.Object)
	 */
	@Override
	public IPair getSuccessor(IPair transition) {
		T1 t1 = transition.first;
		T2 t2 = transition.second;
		return new IPair<>(ts1.getSuccessor(t1), ts2.getSuccessor(t2));
	}

}