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76 lines
2.2 KiB
76 lines
2.2 KiB
//==============================================================================
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//
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// Copyright (c) 2014-
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// Authors:
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// * Joachim Klein <klein@tcs.inf.tu-dresden.de> (TU Dresden)
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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.BitSet;
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import prism.PrismException;
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/**
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* Abstract base class for an SCC consumer that is only interested in
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* the bottom strongly-connected components (BSCCs). <br/>
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*
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* Intercepts the {@code notifyNextSCC()} call, checks whether the SCC
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* is a BSCC and calls {@code notifyNextBSCC()} if that is the case.
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*/
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public abstract class SCCConsumerBSCCs extends SCCConsumerBitSet {
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protected Model model;
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/** Constructor */
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public SCCConsumerBSCCs()
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{
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model = null; // will be set by notifyStart call
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}
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public void notifyStart(Model model)
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{
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this.model = model;
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}
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/**
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* Call-back function. Called upon discovery of a BSCC.
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*/
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public abstract void notifyNextBSCC(BitSet bscc) throws PrismException;
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@Override
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public void notifyNextSCC(BitSet scc) throws PrismException
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{
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boolean bottom = true;
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// BSCC <=> for all states s, all successors are again in the SCC.
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for (int s = scc.nextSetBit(0); s >= 0; s = scc.nextSetBit(s + 1)) {
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if (!model.allSuccessorsInSet(s, scc)) {
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bottom = false;
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break;
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}
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}
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if (bottom) {
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notifyNextBSCC(scc);
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}
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}
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}
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