标签：abstract new pos 技术 func div xtend 技术分享 this
将对象组合成树形结构以表示整体-部分的层次结构,组合模式使得用户对单个对象和组合对象的使用具有一致性.
UML:
示例代码:
透明组合:叶节点和子节点具有相同的接口
abstract class Component
{
protected $name;
public function __construct($name)
{
$this->name = $name;
}
abstract public function add(Component $node);
abstract public function remove(Component $node);
abstract public function display($deep);
}
// 页节点
class Leaf extends Component
{
public function add(Component $node)
{
// 叶不能添加节点
}
public function remove(Component $node)
{
// 叶不能删除节点
}
public function display($deep)
{
echo str_repeat(‘-‘, $deep) . $this->name . PHP_EOL;
}
}
// 枝节点
class Composite extends Component
{
protected $nodes = array();
public function add(Component $node)
{
$this->nodes[] = $node;
}
public function remove(Component $node)
{
unset($this->nodes[array_search($node, $this->nodes)]);
}
public function display($deep)
{
echo str_repeat(‘-‘, $deep) . $this->name . PHP_EOL;
foreach ($this->nodes as $node)
{
$node->display($deep + 2);
}
}
}
$root = new Composite(‘/root‘);
$root->add(new Leaf(‘/a.txt‘));
$root->add(new Leaf(‘/b.txt‘));
$etc = new Composite(‘/etc‘);
$etc->add(new Leaf(‘httpd‘));
$etc->add(new Leaf(‘nginx‘));
$root->add($etc);
$root->display(2);
示例代码:
安全组合:接口中不强制实现增加和删除节点,叶节点不具备该两项功能.
abstract class Component
{
protected $name;
public function __construct($name)
{
$this->name = $name;
}
abstract public function display($deep);
}
// 页节点
class Leaf extends Component
{
public function display($deep)
{
echo str_repeat(‘-‘, $deep) . $this->name . PHP_EOL;
}
}
// 枝节点
class Composite extends Component
{
protected $nodes = array();
public function add(Component $node)
{
$this->nodes[] = $node;
}
public function remove(Component $node)
{
unset($this->nodes[array_search($node, $this->nodes)]);
}
public function display($deep)
{
echo str_repeat(‘-‘, $deep) . $this->name . PHP_EOL;
foreach ($this->nodes as $node)
{
$node->display($deep + 2);
}
}
}
$root = new Composite(‘/root‘);
$root->add(new Leaf(‘/a.txt‘));
$root->add(new Leaf(‘/b.txt‘));
$etc = new Composite(‘/etc‘);
$etc->add(new Leaf(‘httpd‘));
$etc->add(new Leaf(‘nginx‘));
$root->add($etc);
$root->display(2);
标签：abstract new pos 技术 func div xtend 技术分享 this
原文地址：http://www.cnblogs.com/itfenqing/p/7788130.html
