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89 lines
3.2 KiB
89 lines
3.2 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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//
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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 (M)ECs, i.e. (maximal) end components,
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* for a nondeterministic model such as an MDP.
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*/
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public abstract class ECComputer extends PrismComponent
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{
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/**
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* Static method to create a new ECComputer object, depending on current settings.
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*/
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public static ECComputer createECComputer(PrismComponent parent, NondetModel model) throws PrismException
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{
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// Only one algorithm implemented currently
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return new ECComputerDefault(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 ECComputer(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 states of maximal end components (MECs) and store them.
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* They can be retrieved using {@link #getMECStates()}.
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*/
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public abstract void computeMECStates() throws PrismException;
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/**
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* Compute states of all maximal end components (MECs) in the submodel obtained
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* by restricting this one to the set of states {@code restrict}, and store them.
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* They can be retrieved using {@link #getMECStates()}.
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* If {@code restrict} is null, we look at the whole model, not a submodel.
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* @param restrict BitSet for the set of states to restrict to.
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*/
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public abstract void computeMECStates(BitSet restrict) throws PrismException;
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/**
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* Compute states of all accepting maximal end components (MECs) in the submodel obtained
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* by restricting this one to the set of states {@code restrict}, and store them,
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* where acceptance is defined as those which intersect with {@code accept}.
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* They can be retrieved using {@link #getMECStates()}.
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* If {@code restrict} is null, we look at the whole model, not a submodel.
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* If {@code accept} is null, the acceptance condition is trivially satisfied.
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* @param restrict BitSet for the set of states to restrict to
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* @param accept BitSet for the set of accepting states
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*/
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public abstract void computeMECStates(BitSet restrict, BitSet accept) throws PrismException;
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/**
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* Get the list of states for computed MECs.
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*/
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public abstract List<BitSet> getMECStates();
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}
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