C4:原型模式 Prototype

用原型实例指定创建对象的种类,并且拷贝这些原型创建新的对象.
应用场景:

A.用new创建对象通常有较为复杂的数据准备或权限准备
B.对象较大,拷贝对象可以节省内存

UML图:

class WorkExperience
{
    private $workTime;
    private $workAddress;    public function __construct($workTime, $workAddress)
    {
        $this->workTime = $workTime;
        $this->workAddress = $workAddress;
    }    /**
     * @return mixed
     */
    public function getWorkTime()
    {
        return $this->workTime;
    }    /**
     * @return mixed
     */
    public function getWorkAddress()
    {
        return $this->workAddress;
    }    /**
     * @param mixed $workTime
     */
    public function setWorkTime($workTime)
    {
        $this->workTime = $workTime;
    }    /**
     * @param mixed $workAddress
     */
    public function setWorkAddress($workAddress)
    {
        $this->workAddress = $workAddress;
    }}abstract class Prototype
{
    protected $age;
    protected $name;
    protected $workExperience;    public function __clone() {
        $this->workExperience = clone $this->workExperience; //将对象深拷贝
    }
}class Resume extends Prototype
{
    public function __construct($name)
    {
        $this->name = $name;
    }    /**
     * @return mixed
     */
    public function getAge()
    {
        return $this->age;
    }    /**
     * @param mixed $age
     */
    public function setAge($age)
    {
        $this->age = $age;
    }    /**
     * @return mixed
     */
    public function getName()
    {
        return $this->name;
    }    /**
     * @param mixed $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }    /**
     * @return mixed
     */
    public function getWorkExperience()
    {
        return $this->workExperience;
    }    /**
     * @param mixed $workExperience
     */
    public function setWorkExperience(WorkExperience $workExperience)
    {
        $this->workExperience = $workExperience;
    }
}$workExp = new WorkExperience('2013-2015', ' A commpany');$resumeA = new Resume("jack");
$resumeA->setAge(23);
$resumeA->setWorkExperience($workExp);$resumeB = clone $resumeA;
$workExp->setWorkTime('2016-2017');
$resumeA->setWorkExperience($workExp);echo $resumeA->getName() . PHP_EOL;
echo $resumeA->getAge() . PHP_EOL;
echo $resumeA->getWorkExperience()->getWorkTime() ;
echo $resumeA->getWorkExperience()->getWorkAddress() . PHP_EOL;
echo $resumeB->getWorkExperience()->getWorkTime() ;
echo $resumeB->getWorkExperience()->getWorkAddress() . PHP_EOL;