libkern/c++/OSBoolean.cpp

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /* OSBoolean.cpp created by rsulack on Tue Oct 12 1999 */
  24
  25 #include <libkern/c++/OSBoolean.h>
  26 #include <libkern/c++/OSString.h>
  27 #include <libkern/c++/OSSerialize.h>
  28 #include <libkern/c++/OSLib.h>
  29
  30 #define super OSObject
  31
  32 OSDefineMetaClassAndStructors(OSBoolean, OSObject)
  33 OSMetaClassDefineReservedUnused(OSBoolean, 0);
  34 OSMetaClassDefineReservedUnused(OSBoolean, 1);
  35 OSMetaClassDefineReservedUnused(OSBoolean, 2);
  36 OSMetaClassDefineReservedUnused(OSBoolean, 3);
  37 OSMetaClassDefineReservedUnused(OSBoolean, 4);
  38 OSMetaClassDefineReservedUnused(OSBoolean, 5);
  39 OSMetaClassDefineReservedUnused(OSBoolean, 6);
  40 OSMetaClassDefineReservedUnused(OSBoolean, 7);
  41
  42 static OSBoolean * gOSBooleanTrue  = 0;
  43 static OSBoolean * gOSBooleanFalse = 0;
  44
  45 OSBoolean * const & kOSBooleanTrue  = gOSBooleanTrue;
  46 OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse;
  47
  48 void OSBoolean::initialize()
  49 {
  50     gOSBooleanTrue = new OSBoolean;
  51     assert(gOSBooleanTrue);
  52
  53     if (!gOSBooleanTrue->init()) {
  54         gOSBooleanTrue->OSObject::free();
  55         assert(false);
  56     };
  57     gOSBooleanTrue->value = true;
  58
  59     gOSBooleanFalse = new OSBoolean;
  60     assert(gOSBooleanFalse);
  61
  62     if (!gOSBooleanFalse->init()) {
  63         gOSBooleanFalse->OSObject::free();
  64         assert(false);
  65     };
  66     gOSBooleanFalse->value = false;
  67 }
  68
  69 void OSBoolean::free()
  70 {
  71     /*
  72      * An OSBoolean should never have free() called on it, since it is a shared
  73      * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse.
  74      * There will be cases where an incorrect number of releases will cause the
  75      * free() method to be called, however, which we must catch and ignore here.
  76      */
  77     assert(false);
  78 }
  79
  80 void OSBoolean::taggedRetain(const void *tag) const { }
  81 void OSBoolean::taggedRelease(const void *tag, const int when) const { }
  82
  83 OSBoolean *OSBoolean::withBoolean(bool inValue)
  84 {
  85     return (inValue) ? kOSBooleanTrue : kOSBooleanFalse;
  86 }
  87
  88 bool OSBoolean::isTrue() const { return value; }
  89 bool OSBoolean::isFalse() const { return !value; }
  90 bool OSBoolean::getValue() const { return value; }
  91
  92 bool OSBoolean::isEqualTo(const OSBoolean *boolean) const
  93 {
  94     return (boolean == this);
  95 }
  96
  97 bool OSBoolean::isEqualTo(const OSMetaClassBase *obj) const
  98 {
  99     OSBoolean * boolean;
 100     if ((boolean = OSDynamicCast(OSBoolean, obj)))
 101         return isEqualTo(boolean);
 102     else
 103         return false;
 104 }
 105
 106 bool OSBoolean::serialize(OSSerialize *s) const
 107 {
 108     return s->addString(value ? "<true/>" : "<false/>");
 109 }