libkern/c++/OSBoolean.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* OSBoolean.cpp created by rsulack on Tue Oct 12 1999 */
  23
  24 #include <libkern/c++/OSBoolean.h>
  25 #include <libkern/c++/OSString.h>
  26 #include <libkern/c++/OSSerialize.h>
  27 #include <libkern/c++/OSLib.h>
  28
  29 #define super OSObject
  30
  31 OSDefineMetaClassAndStructors(OSBoolean, OSObject)
  32 OSMetaClassDefineReservedUnused(OSBoolean, 0);
  33 OSMetaClassDefineReservedUnused(OSBoolean, 1);
  34 OSMetaClassDefineReservedUnused(OSBoolean, 2);
  35 OSMetaClassDefineReservedUnused(OSBoolean, 3);
  36 OSMetaClassDefineReservedUnused(OSBoolean, 4);
  37 OSMetaClassDefineReservedUnused(OSBoolean, 5);
  38 OSMetaClassDefineReservedUnused(OSBoolean, 6);
  39 OSMetaClassDefineReservedUnused(OSBoolean, 7);
  40
  41 static OSBoolean * gOSBooleanTrue  = 0;
  42 static OSBoolean * gOSBooleanFalse = 0;
  43
  44 OSBoolean * const & kOSBooleanTrue  = gOSBooleanTrue;
  45 OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse;
  46
  47 void OSBoolean::initialize()
  48 {
  49     gOSBooleanTrue = new OSBoolean;
  50     assert(gOSBooleanTrue);
  51
  52     if (!gOSBooleanTrue->init()) {
  53         gOSBooleanTrue->OSObject::free();
  54         assert(false);
  55     };
  56     gOSBooleanTrue->value = true;
  57
  58     gOSBooleanFalse = new OSBoolean;
  59     assert(gOSBooleanFalse);
  60
  61     if (!gOSBooleanFalse->init()) {
  62         gOSBooleanFalse->OSObject::free();
  63         assert(false);
  64     };
  65     gOSBooleanFalse->value = false;
  66 }
  67
  68 void OSBoolean::free()
  69 {
  70     /*
  71      * An OSBoolean should never have free() called on it, since it is a shared
  72      * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse.
  73      * There will be cases where an incorrect number of releases will cause the
  74      * free() method to be called, however, which we must catch and ignore here.
  75      */
  76     assert(false);
  77 }
  78
  79 OSBoolean *OSBoolean::withBoolean(bool inValue)
  80 {
  81     if (inValue) {
  82         kOSBooleanTrue->retain();
  83         return kOSBooleanTrue;
  84     } else {
  85         kOSBooleanFalse->retain();
  86         return kOSBooleanFalse;
  87     }
  88 }
  89
  90 bool OSBoolean::isTrue() const { return value; }
  91 bool OSBoolean::isFalse() const { return !value; }
  92 bool OSBoolean::getValue() const { return value; }
  93
  94 bool OSBoolean::isEqualTo(const OSBoolean *boolean) const
  95 {
  96     return (boolean == this);
  97 }
  98
  99 bool OSBoolean::isEqualTo(const OSMetaClassBase *obj) const
 100 {
 101     OSBoolean * boolean;
 102     if ((boolean = OSDynamicCast(OSBoolean, obj)))
 103         return isEqualTo(boolean);
 104     else
 105         return false;
 106 }
 107
 108 bool OSBoolean::serialize(OSSerialize *s) const
 109 {
 110     return s->addString(value ? "<true/>" : "<false/>");
 111 }