1 /*

     2  * Copyright 2010 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.java2d.xr;

    27 

    28 /**

    29  * UInt32 "emulation", mimics the behaviour of xcb's request counter.

    30  * In order to be compatible with xcb we have to wrap exactly when xcb would do.

    31  * @author Clemens Eisserer

    32  */

    33 

    34 public class XcbRequestCounter {

    35     private final static long MAX_UINT = 4294967295L;

    36 

    37     long value;

    38 

    39     public XcbRequestCounter(long value) {

    40         this.value = value;

    41     }

    42 

    43     public void setValue(long value) {

    44         this.value = value;

    45     }

    46 

    47     public long getValue() {

    48         return value;

    49     }

    50 

    51     public void add(long v) {

    52         value += v;

    53 

    54         /*Handle 32-bit unsigned int overflow*/

    55         if (value > MAX_UINT) {

    56             value = 0; //-= MAX_UINT; //Shouldn't that be zero?!?!

    57         }

    58     }

    59 }