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132 lines
2.8 KiB
132 lines
2.8 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.ast;
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import parser.*;
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import parser.visitor.*;
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import prism.PrismLangException;
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import parser.type.*;
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public class ExpressionVar extends Expression
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{
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// Variable name
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private String name;
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// The index of the variable in the model to which it belongs
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private int index;
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// Constructors
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public ExpressionVar(String n, Type t)
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{
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setType(t);
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name = n;
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index = -1;
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}
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// Set method
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public void setName(String n)
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{
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name = n;
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}
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public void setIndex(int i)
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{
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index = i;
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}
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// Get method
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public String getName()
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{
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return name;
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}
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public int getIndex()
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{
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return index;
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}
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// Methods required for Expression:
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/**
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* Is this expression constant?
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*/
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public boolean isConstant()
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{
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return false;
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}
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/**
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* Evaluate this expression, return result.
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* Note: assumes that type checking has been done already.
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*/
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public Object evaluate(EvaluateContext ec) throws PrismLangException
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{
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Object res = ec.getVarValue(name, index);
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if (res == null)
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throw new PrismLangException("Could not evaluate variable", this);
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return res;
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}
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@Override
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public boolean returnsSingleValue()
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{
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return false;
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}
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// Methods required for ASTElement:
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/**
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* Visitor method.
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*/
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public Object accept(ASTVisitor v) throws PrismLangException
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{
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return v.visit(this);
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}
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/**
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* Convert to string.
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*/
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public String toString()
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{
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return name;
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}
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/**
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* Perform a deep copy.
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*/
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public Expression deepCopy()
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{
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ExpressionVar expr = new ExpressionVar(name, type);
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expr.setIndex(index);
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expr.setPosition(this);
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return expr;
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}
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}
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//------------------------------------------------------------------------------
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