001/* Determine the bit width of the JVM.
002
003 Copyright (c) 2010-2011 The Regents of the University of California.
004 All rights reserved.
005 Permission is hereby granted, without written agreement and without
006 license or royalty fees, to use, copy, modify, and distribute this
007 software and its documentation for any purpose, provided that the above
008 copyright notice and the following two paragraphs appear in all copies
009 of this software.
010
011 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
012 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
013 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
014 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
015 SUCH DAMAGE.
016
017 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
018 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
019 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
020 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
021 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
022 ENHANCEMENTS, OR MODIFICATIONS.
023
024 PT_COPYRIGHT_VERSION_2
025 COPYRIGHTENDKEY
026
027
028 */
029
030package ptolemy.util;
031
032///////////////////////////////////////////////////////////////////
033//// 32Or64bitJVM
034
035/** Determine the bit width (32 or 64) of the JVM.
036 *  @author Christopher Brooks
037 *  @version $Id$
038 *  @since Ptolemy II 8.1
039 *  @Pt.ProposedRating Red (cxh)
040 * @Pt.AcceptedRating Red
041 */
042public class JVMBitWidth {
043    /** Return true if this is a 32bit JVM.
044     *  @return true if this is a 32bit JVM.
045     */
046    public static boolean is32Bit() {
047        String dataModelProperty = StringUtilities
048                .getProperty("sun.arch.data.model");
049        // FIXME: it is difficult to detect if we are under a
050        // 64bit JVM.  See
051        // http://forums.sun.com/thread.jspa?threadID=5306174
052        if (dataModelProperty.indexOf("64") != -1) {
053            return false;
054        } else {
055            String javaVmNameProperty = StringUtilities
056                    .getProperty("java.vm.name");
057            if (javaVmNameProperty.indexOf("64") != -1) {
058                return false;
059            }
060        }
061        return true;
062    }
063}