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59 lines
1.9 KiB
59 lines
1.9 KiB
//==============================================================================
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//
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// Copyright (c) 2002-
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// Authors:
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// * Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
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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 parser;
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/**
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* Information required to evaluate an expression: a subset of a State object.
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* More precisely: a State object, indexed over a subset of all variables,
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* and a mapping from indices (over all variables) to this subset (-1 if not in subset).
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*/
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public class EvaluateContextSubstate implements EvaluateContext
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{
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private Object[] varValues;
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private int[] varMap;
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public EvaluateContextSubstate(State substate, int[] varMap)
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{
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this.varValues = substate.varValues;
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this.varMap = varMap;
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}
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public Object getConstantValue(String name)
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{
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// No constant value stored here
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return null;
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}
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public Object getVarValue(String name, int index)
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{
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// Use indices to look up value
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int newIndex;
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if (index == -1 || (newIndex = varMap[index]) == -1)
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return null;
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return varValues[newIndex];
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}
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}
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