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97 lines
2.5 KiB
97 lines
2.5 KiB
//==============================================================================
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//
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// Copyright (c) 2002-
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// Authors:
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// * Dave Parker <d.a.parker@cs.bham.ac.uk> (University of Birmingham/Oxford)
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// * Mateusz Ujma <mateusz.ujma@cs.ox.ac.uk> (University of Oxford)
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//
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//------------------------------------------------------------------------------
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//
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// This file is part of PRISM.
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//
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// PRISM is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// PRISM is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with PRISM; if not, write to the Free Software Foundation,
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// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//==============================================================================
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package explicit;
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import java.util.ArrayList;
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import java.util.BitSet;
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import java.util.List;
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import explicit.SCCComputer.SCCMethod;
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/**
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* Maximal end component computer for a nondeterministic model such as MDP.
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*/
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public class ECComputerDefault extends ECComputer
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{
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/* The model to compute (M)ECs for */
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private NondetModel model;
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/* Computed list of MECs */
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private List<BitSet> mecs = new ArrayList<BitSet>();
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/**
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* Build (M)EC computer for a given model.
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*/
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public ECComputerDefault(NondetModel model)
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{
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this.model = model;
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}
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// Methods for SCCComputer interface
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@Override
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public void computeMECs()
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{
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SCCComputer sccc = SCCComputer.createSCCComputer(SCCMethod.TARJAN, model);
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sccc.computeSCCs();
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List<BitSet> sccs = sccc.getSCCs();
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for(int i=0;i<sccs.size();i++) {
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if(isMEC(sccs.get(i))) {
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System.out.println("SCCs " + sccs.get(i));
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mecs.add(sccs.get(i));
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}
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}
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}
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@Override
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public List<BitSet> getMECs()
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{
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return mecs;
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}
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private boolean isMEC(BitSet b) {
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if(b.cardinality() == 0) return false;
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int state = b.nextSetBit(0);
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while(state != -1) {
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boolean atLeastOneAction = false;
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for(int i=0;i<model.getNumChoices(state);i++) {
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if(model.allSuccessorsInSet(state, i, b)) {
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atLeastOneAction = true;
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}
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}
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if(!atLeastOneAction) {
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return false;
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}
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state = b.nextSetBit(state+1);
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}
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return true;
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}
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}
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