ShiftRight.java

/*
 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 * COMPONENT_NAME: idl.parser
 *
 * ORIGINS: 27
 *
 * Licensed Materials - Property of IBM
 * 5639-D57 (C) COPYRIGHT International Business Machines Corp. 1997, 1999
 * RMI-IIOP v1.0
 *
 */

package com.sun.tools.corba.se.idl.constExpr;

// NOTES:

import com.sun.tools.corba.se.idl.Util;
import java.math.BigInteger;

public class ShiftRight extends BinaryExpr
{
  protected ShiftRight (Expression leftOperand, Expression rightOperand)
  {
    super (">>", leftOperand, rightOperand);
  } // ctor

  public Object evaluate () throws EvaluationException
  {
    try
    {
      Number l = (Number)left ().evaluate ();
      Number r = (Number)right ().evaluate ();

      if (l instanceof Float || l instanceof Double || r instanceof Float || r instanceof Double)
      {
        String[] parameters = {Util.getMessage ("EvaluationException.right"), left ().value ().getClass ().getName (), right ().value ().getClass ().getName ()};
        throw new EvaluationException (Util.getMessage ("EvaluationException.1", parameters));
      }
      else
      {
        // Shift right (>>)
        //daz        value (new Long (l.longValue () >> r.longValue ()));
        BigInteger bL = (BigInteger)coerceToTarget ((BigInteger)l);
        BigInteger bR = (BigInteger)r;

        // Change signed to unsigned (Clear sign bit--can be done when setting bL!)
        if (bL.signum () == -1)
          if (type ().equals ("short"))
            bL = bL.add (twoPow16);
          else if (type ().equals ("long"))
            bL = bL.add (twoPow32);
          else if (type ().equals ("long long"))
            bL = bL.add (twoPow64);

        value (bL.shiftRight (bR.intValue ()));
      }
    }
    catch (ClassCastException e)
    {
      String[] parameters = {Util.getMessage ("EvaluationException.right"), left ().value ().getClass ().getName (), right ().value ().getClass ().getName ()};
      throw new EvaluationException (Util.getMessage ("EvaluationException.1", parameters));
    }
    return value ();
  } // evaluate
} // class ShiftRight