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StatePattern.php
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StatePattern.php
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<?php
interface State
{
public function proceedToNext(OrderContext $context);
public function __toString(): string;
}
class OrderContext
{
private State $state;
public static function create(): OrderContext
{
$order = new self();
$order->state = new StateCreated();
return $order;
}
public function setState(State $state)
{
$this->state = $state;
}
public function proceedToNext()
{
$this->state->proceedToNext($this);
}
public function __toString()
{
return $this->state->__toString();
}
}
class StateCreated implements State
{
public function proceedToNext(OrderContext $context)
{
$context->setState(new StateShipped());
}
public function __toString(): string
{
return 'created';
}
}
class StateShipped implements State
{
public function proceedToNext(OrderContext $context)
{
$context->setState(new StateDone());
}
public function __toString(): string
{
return 'shipped';
}
}
class StateDone implements State
{
public function proceedToNext(OrderContext $context)
{
// do nothing
}
public function __toString(): string
{
return 'done';
}
}