适配器模式:将目标接口,转化为客户期望的接口。
在我们的示例中,目标接口是MonkeyInterface,
但是客户(Test类的run方法)期望的是PersonInterface,即客户期望处理的Person。
我们的处理方式是在客户和目标接口中间加一个适配器(MonkeyAdapter),客户使用的是适配器实例,适配器
实例最终会将相应请求委托给它持有的目标对象来处理(MonkeyAdapter中的$monkey属性)
<?php
interface MonkeyInterface
{
public function jump();
public function roar();//吼叫
}
interface PersonInterface
{
public function walk();
public function speak();
}
class LittleMonkey implements MonkeyInterface
{
public function jump()
{
echo "jump jump<br>\n";
}
public function roar()
{
echo "ohoooooo..<br>\n";
}
}
class LittleBoy implements PersonInterface
{
public function walk()
{
echo "I am walking<br>\n";
}
public function speak()
{
echo "I am speaking<br>\n";
}
}
class MonkeyAdapter implements PersonInterface
{
private $monkey;
public function __construct(MonkeyInterface $monkey)
{
$this->monkey = $monkey;
}
public function walk()
{
$this->monkey->jump();
}
public function speak()
{
$this->monkey->roar();
}
}
class Test
{
public function run()
{
$person = new LittleBoy();
$person->walk();
$person->speak();
$monkey = new LittleMonkey();
$monkeyAdapter = new MonkeyAdapter($monkey);
$monkeyAdapter->walk();
$monkeyAdapter->speak();
}
}
$test = new Test();
$test->run();