/* InstanceOfOperator Copyright (C) 1998-2002 Jochen Hoenicke.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 Lesser General Public License
 * along with this program; see the file COPYING.LESSER.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */

package net.sf.jode.expr;
import net.sf.jode.type.Type;
import net.sf.jode.decompiler.TabbedPrintWriter;

public class InstanceOfOperator extends Operator {

    Type instanceType;    

    public InstanceOfOperator(Type type) {
        super(Type.tBoolean, 0);
        this.instanceType = type;
	initOperands(1);
    }

    public int getPriority() {
        return 550;
    }

    public void updateSubTypes() {
	subExpressions[0].setType(Type.tUObject);
    }

    public void updateType() {
    }

    public void dumpExpression(TabbedPrintWriter writer)
	throws java.io.IOException {
	/* There are special cases where a cast isn't allowed.  We
	 * must cast to the common super type before.  In these cases
	 * instanceof always return false, but we want to decompile
	 * even bad programs.  */
	Type superType
	    = instanceType.getCastHelper(subExpressions[0].getType());
	if (superType != null) {
	    writer.startOp(TabbedPrintWriter.IMPL_PAREN, 2);
	    writer.print("(");
	    writer.printType(superType);
	    writer.print(") ");
	    writer.breakOp();
	    subExpressions[0].dumpExpression(writer, 700);
	    writer.endOp();
	} else
	    subExpressions[0].dumpExpression(writer, 550);
	writer.breakOp();
        writer.print(" instanceof ");
	writer.printType(instanceType);
    }
}