libkern/c++/OSBoolean.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* OSBoolean.cpp created by rsulack on Tue Oct 12 1999 */
  29
  30 #include <libkern/c++/OSBoolean.h>
  31 #include <libkern/c++/OSString.h>
  32 #include <libkern/c++/OSSerialize.h>
  33 #include <libkern/c++/OSLib.h>
  34
  35 #define super OSObject
  36
  37 OSDefineMetaClassAndStructorsWithInit(OSBoolean, OSObject, OSBoolean::initialize())
  38 OSMetaClassDefineReservedUnused(OSBoolean, 0);
  39 OSMetaClassDefineReservedUnused(OSBoolean, 1);
  40 OSMetaClassDefineReservedUnused(OSBoolean, 2);
  41 OSMetaClassDefineReservedUnused(OSBoolean, 3);
  42 OSMetaClassDefineReservedUnused(OSBoolean, 4);
  43 OSMetaClassDefineReservedUnused(OSBoolean, 5);
  44 OSMetaClassDefineReservedUnused(OSBoolean, 6);
  45 OSMetaClassDefineReservedUnused(OSBoolean, 7);
  46
  47 static OSBoolean * gOSBooleanTrue  = NULL;
  48 static OSBoolean * gOSBooleanFalse = NULL;
  49
  50 OSBoolean * const & kOSBooleanTrue  = gOSBooleanTrue;
  51 OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse;
  52
  53 void
  54 OSBoolean::initialize()
  55 {
  56         gOSBooleanTrue = new OSBoolean;
  57         assert(gOSBooleanTrue);
  58
  59         if (!gOSBooleanTrue->init()) {
  60                 gOSBooleanTrue->OSObject::free();
  61                 assert(false);
  62         }
  63         ;
  64         gOSBooleanTrue->value = true;
  65
  66         gOSBooleanFalse = new OSBoolean;
  67         assert(gOSBooleanFalse);
  68
  69         if (!gOSBooleanFalse->init()) {
  70                 gOSBooleanFalse->OSObject::free();
  71                 assert(false);
  72         }
  73         ;
  74         gOSBooleanFalse->value = false;
  75 }
  76
  77 void
  78 OSBoolean::free()
  79 {
  80         /*
  81          * An OSBoolean should never have free() called on it, since it is a shared
  82          * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse.
  83          * There will be cases where an incorrect number of releases will cause the
  84          * free() method to be called, however, which we must catch and ignore here.
  85          */
  86         assert(false);
  87 }
  88
  89 void
  90 OSBoolean::taggedRetain(__unused const void *tag) const
  91 {
  92 }
  93 void
  94 OSBoolean::taggedRelease(__unused const void *tag, __unused const int when) const
  95 {
  96 }
  97
  98 OSBoolean *
  99 OSBoolean::withBoolean(bool inValue)
 100 {
 101         return (inValue) ? kOSBooleanTrue : kOSBooleanFalse;
 102 }
 103
 104 bool
 105 OSBoolean::isTrue() const
 106 {
 107         return value;
 108 }
 109 bool
 110 OSBoolean::isFalse() const
 111 {
 112         return !value;
 113 }
 114 bool
 115 OSBoolean::getValue() const
 116 {
 117         return value;
 118 }
 119
 120 bool
 121 OSBoolean::isEqualTo(const OSBoolean *boolean) const
 122 {
 123         return boolean == this;
 124 }
 125
 126 bool
 127 OSBoolean::isEqualTo(const OSMetaClassBase *obj) const
 128 {
 129         OSBoolean * boolean;
 130         if ((boolean = OSDynamicCast(OSBoolean, obj))) {
 131                 return isEqualTo(boolean);
 132         } else {
 133                 return false;
 134         }
 135 }
 136
 137 bool
 138 OSBoolean::serialize(OSSerialize *s) const
 139 {
 140         if (s->binary) {
 141                 return s->binarySerialize(this);
 142         }
 143
 144         return s->addString(value ? "<true/>" : "<false/>");
 145 }