add flyweight file

Hu Lin · Hu Lin · commit b48840bf0acd · 2016-12-05T19:21:30.000+08:00
diff --git a/codes/Flyweight.php b/codes/Flyweight.php
@@ -0,0 +1,55 @@
+<?php
+
+abstract class Flyweight
+{
+	abstract public function operation($extringsicState);
+}
+
+class ConcreteFlyweight extends Flyweight
+{
+	public function operation($extringsicState)
+	{
+		echo "ConcreteFlyweight:".$extringsicState."\n";
+	}
+}
+
+class UnsharedConcreteFlyweight extends Flyweight
+{
+	public function operation($extringsicState)
+	{
+		echo "Unshared ConcreteFlyweight:".$extringsicState."\n";
+	}
+}
+
+class FlyweightFactory
+{
+	private $flyweights = [];
+
+	function __construct()
+	{	
+		$this->flyweights['x'] = new ConcreteFlyweight();
+		$this->flyweights['y'] = new ConcreteFlyweight();
+		$this->flyweights['z'] = new ConcreteFlyweight();
+	}
+
+	public function getFlyweight($key)
+	{
+		return $this->flyweights[$key];
+	}
+}
+
+//client 
+
+$state = 22;
+$f = new FlyweightFactory();
+$fx =  $f->getFlyweight('x');
+$fx->operation(--$state);
+
+$fx =  $f->getFlyweight('y');
+$fx->operation(--$state);
+
+$fx =  $f->getFlyweight('z');
+$fx->operation(--$state);
+
+$uf = new UnsharedConcreteFlyweight();
+$uf->operation(--$state);
