public static function getCar($make, $model)
{
// Remember how to make the first character uppercase
$className = ucfirst(strtolower($model));
//echo '$className=' . $className;
// How do you make sure a class exists?
if (!class_exists($className)) {
// How do you throw exceptions?
throw new Exception($className . ' does not exist!');
}
// Remember how to dynamically instantiate objects
$obj = new $className();
$make = ucfirst($make);
// How do you make sure the parent class is valid?
if (!is_subclass_of($obj, $make)) {
throw new Exception($className . ' is not a subclass of ' . $make);
}
return $obj;
}
}
class Toyota
{
}
class Corolla extends Toyota
{
}
class Prius extends Toyota
{
}
$car = CarFactory::getCar('toyota', 'corolla');
print_r($car);
{
$model = ucfirst(strtolower($model));
if (!class_exists($model)) {
throw new Exception($model . ' is not a valid model');
}
$newCar = new $model();
$parent = get_parent_class($newCar);
$make = ucfirst(strtolower($make));
//can also use is_subclass_of($child, $parent)
if ($parent != $make) {
throw new Exception($make . ' is not a valid make for this model');
}
return $newCar;
}
}
class Toyota
{
}
class Corolla extends Toyota
{
}
class Prius extends Toyota
{
}
try {
$prius = CarFactory::getCar('Honda', 'Prius');
echo '<pre>';
print_r($prius);
} catch (Exception $e) {
echo $e->getMessage();
}
}
class ToyotaCorolla extends Car
{
}
class ToyotaCamry extends Car
{
}
class ToyotaCrx extends Car
{
}
class HondaCivic extends Car
{
}
class CarFactory
{
public static function getCar($make, $model, $color)
{
$make = ucfirst($make);
$model = ucfirst($model);
$className = $make . $model;
if (!class_exists($className)) {
throw new Exception($className . ' does not exist!');
}
$classObj = new $className($make, $model, $color);
return $classObj;
}
}
// -----------------------------------------------------------
$carObject = CarFactory::getCar('toyota', 'crx', 'black');
echo '<pre>';
print_r($carObject);
echo '<pre>';
print_r($carObject);
$parentClass = get_parent_class($carObject);
// you will need to instantiate this prior
if (ucfirst($make) != $parentClass) {
throw new Exception($make . ' is not valid for ' . $model);
}
return $carObject;
// print_r('$parentClass= ' . $parentClass);
// echo '$className= ' . $className . '</br>';
}
}
abstract class Toyota
{
}
class Corolla extends Toyota
{
}
class Camry extends Toyota
{
}
class Prius extends Toyota
{
}
try {
$car = CarFactory::getCar('honda', 'corolla');
echo '<pre>';
print_r($car);
} catch (Exception $e) {
echo '<font color="red">' . $e->getMessage() . '</font>';
}
class CarFactory
{
public static function getCar($make, $model)
{
if ($make == 'corolla') {
return new Corolla($model);
} elseif ($make == 'camry') {
return new Camry($model);
} else {
throw new NotImplementedException($make . ' is not defined!');
}
}
}
try {
$corolla = CarFactory::getCar('corolla', 'DX');
$camry = CarFactory::getCar('camry', 'LX');
echo 'Corollas Torque: ' . $corolla->getTorque() . '<br/>';
echo 'Camrys Torque: ' . $camry->getTorque() . '<br/>';
} catch (NotImplementedException $exceptionObject) {
echo '<p style="color:red;">' . $exceptionObject->getMessage() . '</p>';
} catch (DeveloperException $devException) {
// Something caught on fire
} catch (GooglePaymentFailedException $googleException) {
// Send out SMS alerts, ring the phones, dim the lights
}
class UserException extends Exception
{
}
class DeveloperException extends Exception
{
}
if (!class_exists($className)) {
throw new Exception($className . ' has not been created!');
}
// Instantiate the class dynamically
$carObject = new $className();
$parentClass = get_parent_class($carObject);
if (ucfirst($make) != $parentClass) {
throw new Exception($make . ' is not valid for ' . $model);
}
return $carObject;
}
}
abstract class Toyota
{
}
class Corolla extends Toyota
{
}
class Camry extends Toyota
{
}
class Prius extends Toyota
{
}
try {
$car = CarFactory::getCar('toyota', 'civic');
echo '<pre>';
print_r($car);
} catch (Exception $whatevs) {
echo '<font color="red">' . $whatevs->getMessage() . '</font>';
}
