Specification Pattern example

Author: geobas

Diff for: README.md

@@ -9,6 +9,7 @@
 * Chain of Responsibility
 * Singleton
 * Factory
+* Specification
 
 ## Installation
 * Type `composer install` the first time to get dependencies

Diff for: index_specification.php

@@ -0,0 +1,14 @@
+<?php
+
+require_once 'src/bootstrap.php';
+
+use GeoBas\Specification\{Customer, CustomerIsGold};
+
+$specification = new CustomerIsGold;
+
+$goldCustomer = new Customer('gold');
+$silverCustomer = new Customer('silver');
+
+echo $specification->isSatisfiedBy($goldCustomer) ? 'true' : 'false';
+echo '<p>';
+echo $specification->isSatisfiedBy($silverCustomer) ? 'true' : 'false';

Diff for: src/Specification/Customer.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace GeoBas\Specification;
+
+class Customer
+{
+	private $type;
+
+	public function __construct($type)
+	{
+		$this->type = $type;
+	}
+
+	public function getType()
+	{
+		return $this->type;
+	}
+}

Diff for: src/Specification/CustomerIsGold.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace GeoBas\Specification;
+
+class CustomerIsGold
+{
+	public function isSatisfiedBy(Customer $customer)
+	{
+		return $customer->getType() == 'gold';
+	}
+}