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darraghenright/turnstile.php

Created September 11, 2013 07:53
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Revisions

  1. darraghenright created this gist Sep 11, 2013.
    63 changes: 63 additions & 0 deletions turnstile.php
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,63 @@
    <?php

    interface TurnstileInterface
    {
    public function insertCoin();
    public function pass();
    }

    class Turnstile implements TurnstileInterface
    {
    private $state;
    private $opened;
    private $closed;

    function __construct()
    {
    $this->opened = new TurnstileStateOpened();
    $this->closed = new TurnstileStateClosed();
    $this->state = $this->closed;
    }

    public function insertCoin()
    {
    $this->state->insertCoin();
    $this->state = $this->opened;
    }

    public function pass()
    {
    $this->state->pass();
    $this->state = $this->closed;
    }
    }

    class TurnstileStateOpened implements TurnstileInterface
    {
    public function insertCoin()
    {
    throw new Exception('Coin already inserted!' . PHP_EOL);
    }

    public function pass()
    {
    echo 'pass! the gate is open!' . PHP_EOL;
    }
    }

    class TurnstileStateClosed implements TurnstileInterface
    {
    public function insertCoin()
    {
    echo 'thanks! opening the gate!' . PHP_EOL;
    }

    public function pass()
    {
    throw new Exception('Alarm! Security!' . PHP_EOL);
    }
    }

    $turnstile = new Turnstile();
    $turnstile->insertCoin();
    $turnstile->pass();