//==============================================================================
//	
//	Copyright (c) 2013-
//	Authors:
//	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford)
//	* Mateusz Ujma <mateusz.ujma@cs.ox.ac.uk> (University of Oxford)
//	
//------------------------------------------------------------------------------
//	
//	This file is part of PRISM.
//	
//	PRISM is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 2 of the License, or
//	(at your option) any later version.
//	
//	PRISM 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 General Public License for more details.
//	
//	You should have received a copy of the GNU General Public License
//	along with PRISM; if not, write to the Free Software Foundation,
//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//	
//==============================================================================

package heuristics.nextstate;

import heuristics.update.StateUpdate;
import explicit.ModelExplorer;

import parser.State;
import prism.PrismException;
import prism.PrismLangException;


public abstract class HeuristicNextStateFactory {

	public enum NextState {
		UNIFORM, RTDP, RR, BRTDP;
		
		public static NextState forName(String name) {
			if(name == null || name.length() == 0) {
				return BRTDP;
			} else {
				return valueOf(name);
			}
		}
	}
	
	public static HeuristicNextState getHeuristicNextState(NextState nextState, ModelExplorer me, StateUpdate stateUpdate) throws PrismException{
		switch(nextState) {
			case UNIFORM:
				return new HeuristicNextStateUniform(me, stateUpdate);
			case RTDP:
				return new HeuristicNextStateRTDP(me, stateUpdate);
			case RR:
				return new HeuristicNextStateRR(me, stateUpdate);
			case BRTDP:
				return new HeuristicNextStateBRTDP(me, stateUpdate);
		}
		throw new PrismLangException("Unknown next state heuristic, got " + nextState);
	}
}
