Bridge Pattern Example #php #design-patterns #bridge-pattern

bridge-pattern.php

<?php
abstract class Window
{
    protected $impl;

    public function __construct(WindowImpl $impl)
    {
        $this->setWindowImpl($impl);
    }

    public function setWindowImpl($impl)
    {
        $this->impl = $impl;
    }
}

class ApplicationWindow extends Window
{
    public function __construct(WindowImpl $impl)
    {
        parent::__construct($impl);
    }

    public function drawLine($x, $y)
    {
        $this->impl->drawLine($x, $y);
    }
}

abstract class WindowImpl
{
    public abstract function drawLine($x, $y);
}

class X11Window extends WindowImpl
{
    public function drawLine($x, $y)
    {
        echo "X11Window->drawLine($x, $y)\n";
    }
}

class MotifWindow extends WindowImpl
{
    public function drawLine($x, $y)
    {
        echo "MotifWindow->drawLine($x, $y)\n";
    }
}

class WindowFactory
{
    public static function getWindowImpl()
    {
        return new X11Window();
    }

    public static function getApplicationWindow()
    {
        return new ApplicationWindow(self::getWindowImpl());
    }
}

$window = WindowFactory::getApplicationWindow();
$window->drawLine(50, 100);
$window->setWindowImpl(new MotifWindow());
$window->drawLine(50, 100);