ShiftLeft.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25/*
26 * COMPONENT_NAME: idl.parser
27 *
28 * ORIGINS: 27
29 *
30 * Licensed Materials - Property of IBM
31 * 5639-D57 (C) COPYRIGHT International Business Machines Corp. 1997, 1999
32 * RMI-IIOP v1.0
33 *
34 */
35
36package com.sun.tools.corba.se.idl.constExpr;
37
38// NOTES:
39
40import com.sun.tools.corba.se.idl.Util;
41import java.math.BigInteger;
42
43public class ShiftLeft extends BinaryExpr
44{
45  protected ShiftLeft (Expression leftOperand, Expression rightOperand)
46  {
47    super ("<<", leftOperand, rightOperand);
48  } // ctor
49
50  public Object evaluate () throws EvaluationException
51  {
52    try
53    {
54      Number l = (Number)left ().evaluate ();
55      Number r = (Number)right ().evaluate ();
56
57      if (l instanceof Float || l instanceof Double || r instanceof Float || r instanceof Double)
58      {
59        String[] parameters = {Util.getMessage ("EvaluationException.left"), left ().value ().getClass ().getName (), right ().value ().getClass ().getName ()};
60        throw new EvaluationException (Util.getMessage ("EvaluationException.1", parameters));
61      }
62      else
63      {
64        // Shift left (<<)
65        //daz        value (new Long (l.longValue () << r.longValue ()));
66        BigInteger bL = (BigInteger)coerceToTarget (l);
67        BigInteger bR = (BigInteger)r;
68
69        BigInteger ls  = bL.shiftLeft (bR.intValue ());
70
71        if (type ().indexOf ("short") >= 0)
72          ls = ls.mod (twoPow16);
73        else if (type ().indexOf ("long") >= 0)
74          ls = ls.mod (twoPow32);
75        else if (type ().indexOf ("long long") >= 0)
76          ls = ls.mod (twoPow64);
77
78        value (coerceToTarget (ls));
79      }
80    }
81    catch (ClassCastException e)
82    {
83      String[] parameters = {Util.getMessage ("EvaluationException.left"), left ().value ().getClass ().getName (), right ().value ().getClass ().getName ()};
84      throw new EvaluationException (Util.getMessage ("EvaluationException.1", parameters));
85    }
86    return value ();
87  } // evaluate
88} // class ShiftLeft
89