NiN

State

7/20/2021 OOPPatternBehavioral pattern

# Description

Thay đổi hành vi (behavior) của object khi trạng thái bên trong của object thay đổi

# Example

Quản lí Order:

  • OrderManager:

    class OrderManager
{
    private OrderState $state;

    public function __construct(OrderState $state)
    {
        $this->setState($state);
    }

    public function setState(OrderState $state)
    {
        $this->state = $state;
    }

    public function nextProceed()
    {
        $this->state->nextProceed($this);
    }

    public function handle()
    {
        return $this->state->handle();
    }
}
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  • OrderState:

    interface OrderState
{
    public function nextProceed(OrderManager $context);

    public function handle();
}
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  • CreatedState:

    class CreatedState implements OrderState
{
    public function nextProceed(OrderManager $manager)
    {
        $manager->setState(new PaymentState());
    }

    public function handle()
    {
        // do something
    }
}
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  • PaymentState:

    class PaymentState implements OrderState
{
    public function nextProceed(OrderManager $manager)
    {
        $manager->setState(new DoneState());
    }

    public function handle()
    {
        // do something
    }
}
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  • DoneState:

    class DoneState implements OrderState
{
    public function nextProceed(OrderManager $manager)
    {
    }

    public function handle()
    {
        // do something
    }
}
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