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66 lines
2.0 KiB
66 lines
2.0 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 State object.
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* This is basically an array of Objects, indexed according to a model file.
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* Optionally values for constants can also be supplied.
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*/
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public class EvaluateContextState implements EvaluateContext
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{
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private Values constantValues;
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private Object[] varValues;
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public EvaluateContextState(State state)
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{
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this.constantValues = null;
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this.varValues = state.varValues;
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}
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public EvaluateContextState(Values constantValues, State state)
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{
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this.constantValues = constantValues;
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this.varValues = state.varValues;
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}
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public Object getConstantValue(String name)
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{
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if (constantValues == null)
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return null;
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int i = constantValues.getIndexOf(name);
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if (i == -1)
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return null;
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return constantValues.getValue(i);
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}
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public Object getVarValue(String name, int index)
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{
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// Use index to look up value
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return index == -1 ? null : varValues[index];
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}
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}
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