/*******************************************************************************
*
* 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.types.PType;
import org.overture.interpreter.runtime.Context;
import org.overture.interpreter.runtime.ValueException;
public class UndefinedValue extends Value
{
private static final long serialVersionUID = 1L;
@Override
public String toString()
{
return "undefined";
}
@Override
public boolean equals(Object other)
{
return false;
}
@Override
public int hashCode()
{
return 0;
}
@Override
public String kind()
{
return toString();
}
@Override
protected Value convertValueTo(PType to, Context ctxt, Set<PType> done) throws ValueException
{
return abort(4132, "Using undefined value", ctxt);
}
@Override
public boolean isUndefined()
{
return true;
}
@Override
public Object clone()
{
return new UndefinedValue();
}
}