start a restructure

Behavioral/Specification/PriceSpecification.php

@@ -0,0 +1,50 @@
+<?php
+namespace DesignPatterns\Specification;
+
+/**
+ * A specification to check an Item is priced between min and max
+ */
+class PriceSpecification extends AbstractSpecification
+{
+    protected $maxPrice;
+    protected $minPrice;
+
+    /**
+     * Sets the optional maximum price
+     *
+     * @param int $maxPrice
+     */
+    public function setMaxPrice($maxPrice)
+    {
+        $this->maxPrice = $maxPrice;
+    }
+
+    /**
+     * Sets the optional minimum price
+     *
+     * @param int $minPrice
+     */
+    public function setMinPrice($minPrice)
+    {
+        $this->minPrice = $minPrice;
+    }
+
+    /**
+     * Checks if Item price falls between bounds
+     * 
+     * @param Item $item
+     * 
+     * @return bool
+     */
+    public function isSatisfiedBy(Item $item)
+    {
+        if ( !empty($this->maxPrice) && $item->getPrice() > $this->maxPrice) {
+            return false;
+        }
+        if ( !empty($this->minPrice) && $item->getPrice() < $this->minPrice) {
+            return false;
+        }
+
+        return true;
+    }
+}