xnu-6153.11.26.tar.gz

[apple/xnu.git] / libkern / c++ / OSBoolean.cpp

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* OSBoolean.cpp created by rsulack on Tue Oct 12 1999 */

#include <libkern/c++/OSBoolean.h>
#include <libkern/c++/OSString.h>
#include <libkern/c++/OSSerialize.h>
#include <libkern/c++/OSLib.h>

#define super OSObject

OSDefineMetaClassAndStructorsWithInit(OSBoolean, OSObject, OSBoolean::initialize())
OSMetaClassDefineReservedUnused(OSBoolean, 0);
OSMetaClassDefineReservedUnused(OSBoolean, 1);
OSMetaClassDefineReservedUnused(OSBoolean, 2);
OSMetaClassDefineReservedUnused(OSBoolean, 3);
OSMetaClassDefineReservedUnused(OSBoolean, 4);
OSMetaClassDefineReservedUnused(OSBoolean, 5);
OSMetaClassDefineReservedUnused(OSBoolean, 6);
OSMetaClassDefineReservedUnused(OSBoolean, 7);

static OSBoolean * gOSBooleanTrue  = NULL;
static OSBoolean * gOSBooleanFalse = NULL;

OSBoolean * const & kOSBooleanTrue  = gOSBooleanTrue;
OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse;

void
OSBoolean::initialize()
{
	gOSBooleanTrue = new OSBoolean;
	assert(gOSBooleanTrue);

	if (!gOSBooleanTrue->init()) {
		gOSBooleanTrue->OSObject::free();
		assert(false);
	}
	;
	gOSBooleanTrue->value = true;

	gOSBooleanFalse = new OSBoolean;
	assert(gOSBooleanFalse);

	if (!gOSBooleanFalse->init()) {
		gOSBooleanFalse->OSObject::free();
		assert(false);
	}
	;
	gOSBooleanFalse->value = false;
}

void
OSBoolean::free()
{
	/*
	 * An OSBoolean should never have free() called on it, since it is a shared
	 * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse.
	 * There will be cases where an incorrect number of releases will cause the
	 * free() method to be called, however, which we must catch and ignore here.
	 */
	assert(false);
}

void
OSBoolean::taggedRetain(__unused const void *tag) const
{
}
void
OSBoolean::taggedRelease(__unused const void *tag, __unused const int when) const
{
}

OSBoolean *
OSBoolean::withBoolean(bool inValue)
{
	return (inValue) ? kOSBooleanTrue : kOSBooleanFalse;
}

bool
OSBoolean::isTrue() const
{
	return value;
}
bool
OSBoolean::isFalse() const
{
	return !value;
}
bool
OSBoolean::getValue() const
{
	return value;
}

bool
OSBoolean::isEqualTo(const OSBoolean *boolean) const
{
	return boolean == this;
}

bool
OSBoolean::isEqualTo(const OSMetaClassBase *obj) const
{
	OSBoolean * boolean;
	if ((boolean = OSDynamicCast(OSBoolean, obj))) {
		return isEqualTo(boolean);
	} else {
		return false;
	}
}

bool
OSBoolean::serialize(OSSerialize *s) const
{
	if (s->binary) {
		return s->binarySerialize(this);
	}

	return s->addString(value ? "<true/>" : "<false/>");
}