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99 lines
2.7 KiB
99 lines
2.7 KiB
//==============================================================================
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//
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// Copyright (c) 2002-
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// Authors:
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// * Christian von Essen <christian.vonessen@imag.fr> (Verimag, Grenoble)
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// * Dave Parker <d.a.parker@cs.bham.ac.uk> (University of Birmingham/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.BitSet;
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import java.util.List;
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import prism.PrismComponent;
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import prism.PrismException;
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/**
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* Abstract class for (explicit) classes that compute (B)SCCs,
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* i.e. (bottom) strongly connected components, for a model's transition graph.
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*/
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public abstract class SCCComputer extends PrismComponent
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{
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// Method used for finding (B)SCCs
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public enum SCCMethod {
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TARJAN;
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public String fullName()
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{
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switch (this) {
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case TARJAN:
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return "Tarjan";
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default:
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return this.toString();
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}
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}
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};
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/**
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* Static method to create a new SCCComputer object, depending on current settings.
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*/
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public static SCCComputer createSCCComputer(PrismComponent parent, Model model) throws PrismException
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{
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// Only one algorithm implemented currently
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return new SCCComputerTarjan(parent, model);
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}
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/**
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* Base constructor.
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*/
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public SCCComputer(PrismComponent parent) throws PrismException
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{
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super(parent);
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}
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/**
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* Compute strongly connected components (SCCs) and store them.
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* They can be retrieved using {@link #getSCCs()}.
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*/
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public abstract void computeSCCs();
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/**
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* Compute bottom strongly connected components (BSCCs) and store them.
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* They can be retrieved using {@link #getBSCCs()} and {@link #getNotInBSCCs()}.
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*/
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public abstract void computeBSCCs();
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/**
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* Get the list of computed SCCs.
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*/
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public abstract List<BitSet> getSCCs();
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/**
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* Get the list of computed BSCCs.
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*/
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public abstract List<BitSet> getBSCCs();
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/**
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* Get the states not in any BSCC.
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*/
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public abstract BitSet getNotInBSCCs();
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}
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