/
16-chain.php
94 lines (79 loc) · 1.86 KB
/
16-chain.php
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<?php
// === CarStatus ===
// Can set next object in line with setNext()
// Can run next object if exists with runNext()
abstract class CarStatus
{
protected $next;
public function setNext(CarStatus $next)
{
$this->next = $next;
}
public function runNext(Car $car)
{
if($this->next) {
$this->next->check($car);
}
}
abstract public function check(Car $car);
}
// A class that inhirit CarStatus and call runNext()
// to invoke similar function on next object in line
class OilPressure extends CarStatus
{
public function check(Car $car)
{
if( $car->oil != "OK" ) {
echo "Oil Pressure is not OK.\n";
} else {
echo "Oil Pressure is OK.\n";
}
$this->runNext($car);
}
}
// A class that inhirit CarStatus and call runNext()
// to invoke similar function on next object in line
class FuelLevel extends CarStatus
{
public function check(Car $car)
{
if( $car->fuel != "OK" ) {
echo "Fuel Level is not OK.\n";
} else {
echo "Fuel Level is OK.\n";
}
$this->runNext($car);
}
}
// A class that inhirit CarStatus and call runNext()
// to invoke similar function on next object in line
class BreakFluid extends CarStatus
{
public function check(Car $car)
{
if( $car->break != "OK" ) {
echo "Break Fluid is not OK.\n";
} else {
echo "Break Fluid is OK.\n";
}
$this->runNext($car);
}
}
class Car
{
public $oil = "OK";
public $fuel;
public $break = "OK";
}
// ---
$oil = new OilPressure();
$fuel = new FuelLevel();
$break = new BreakFluid();
// Setting next objects in line
$oil->setNext($fuel);
$fuel->setNext($break);
$oil->check(new Car());
// Output:
// Oil Pressure is OK.
// Fuel Level is not OK.
// Break Fluid is OK.