libkern/c++/OSBoolean.cpp

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