/*******************************************************************************
*
* Copyright (C) 2008 Fujitsu Services Ltd.
*
* Author: Nick Battle
*
* This file is part of VDMJ.
*
* VDMJ is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* VDMJ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VDMJ. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
package org.overture.interpreter.values;
import java.util.Set;
import org.overture.ast.analysis.AnalysisException;
import org.overture.ast.messages.InternalException;
import org.overture.ast.types.ANatNumericBasicType;
import org.overture.ast.types.PType;
import org.overture.interpreter.runtime.Context;
public class NaturalValue extends IntegerValue
{
private static final long serialVersionUID = 1L;
public NaturalValue(long value) throws Exception
{
super(value);
if (value < 0)
{
throw new Exception("Value " + value + " is not a nat");
}
}
@Override
public String kind()
{
return "nat";
}
@Override
protected Value convertValueTo(PType to, Context ctxt, Set<PType> done)
throws AnalysisException
{
if (to instanceof ANatNumericBasicType)
{
return this;
} else
{
return super.convertValueTo(to, ctxt, done);
}
}
@Override
public Object clone()
{
try
{
return new NaturalValue(longVal);
} catch (Exception e)
{
throw new InternalException(5, "Illegal clone");
}
}
}