/* gnu.classpath.tools.gjdoc.expr.LogicalNotExpression
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath 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 2, or (at your option)
any later version.
GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
package gnu.classpath.tools.gjdoc.expr;
class LogicalNotExpression
extends UnaryExpression
{
protected LogicalNotExpression(Expression expr)
{
super(expr);
}
public ConstantExpression evaluate(Context context)
throws IllegalExpressionException
{
ConstantExpression value = expr.evaluate(context);
if (Type.BOOLEAN == value.getType()) {
return new ConstantBoolean(!((ConstantBoolean)value).booleanValue());
}
else {
throw new IllegalExpressionException("Operator ! cannot be applied to " + value.getType());
}
}
}