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 OSDefineMetaClassAndStructors(OSBoolean, OSObject)
  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  = 0;
  48 static OSBoolean * gOSBooleanFalse = 0;
  49
  50 OSBoolean * const & kOSBooleanTrue  = gOSBooleanTrue;
  51 OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse;
  52
  53 void OSBoolean::initialize()
  54 {
  55     gOSBooleanTrue = new OSBoolean;
  56     assert(gOSBooleanTrue);
  57
  58     if (!gOSBooleanTrue->init()) {
  59         gOSBooleanTrue->OSObject::free();
  60         assert(false);
  61     };
  62     gOSBooleanTrue->value = true;
  63
  64     gOSBooleanFalse = new OSBoolean;
  65     assert(gOSBooleanFalse);
  66
  67     if (!gOSBooleanFalse->init()) {
  68         gOSBooleanFalse->OSObject::free();
  69         assert(false);
  70     };
  71     gOSBooleanFalse->value = false;
  72 }
  73
  74 void OSBoolean::free()
  75 {
  76     /*
  77      * An OSBoolean should never have free() called on it, since it is a shared
  78      * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse.
  79      * There will be cases where an incorrect number of releases will cause the
  80      * free() method to be called, however, which we must catch and ignore here.
  81      */
  82     assert(false);
  83 }
  84
  85 void OSBoolean::taggedRetain(const void *tag) const { }
  86 void OSBoolean::taggedRelease(const void *tag, const int when) const { }
  87
  88 OSBoolean *OSBoolean::withBoolean(bool inValue)
  89 {
  90     return (inValue) ? kOSBooleanTrue : kOSBooleanFalse;
  91 }
  92
  93 bool OSBoolean::isTrue() const { return value; }
  94 bool OSBoolean::isFalse() const { return !value; }
  95 bool OSBoolean::getValue() const { return value; }
  96
  97 bool OSBoolean::isEqualTo(const OSBoolean *boolean) const
  98 {
  99     return (boolean == this);
 100 }
 101
 102 bool OSBoolean::isEqualTo(const OSMetaClassBase *obj) const
 103 {
 104     OSBoolean * boolean;
 105     if ((boolean = OSDynamicCast(OSBoolean, obj)))
 106         return isEqualTo(boolean);
 107     else
 108         return false;
 109 }
 110
 111 bool OSBoolean::serialize(OSSerialize *s) const
 112 {
 113     return s->addString(value ? "<true/>" : "<false/>");
 114 }