Create Callback adapter for Zend\Paginator

library/Zend/Paginator/Adapter/Callback.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Paginator\Adapter;
+
+use Zend\Stdlib\CallbackHandler;
+
+class Callback implements AdapterInterface
+{
+    /**
+     * Callback to be runned to get the items for a page.
+     *
+     * @var CallbackHandler
+     */
+    protected $itemsCallback;
+
+    /**
+     * Callback to be runned to get the total number of items.
+     *
+     * @var CallbackHandler
+     */
+    protected $countCallback;
+
+    /**
+     * Constructs instance.
+     *
+     * @param CallbackHandler|callable $itemsCallback Callback to be runned to get the items for a page.
+     * @param CallbackHandler|callable $countCallback Callback to be runned to get the total number of items.
+     */
+    public function __construct($itemsCallback, $countCallback)
+    {
+        if (! $itemsCallback instanceof CallbackHandler) {
+            $itemsCallback = new CallbackHandler($itemsCallback);
+        }
+
+        if (! $countCallback instanceof CallbackHandler) {
+            $countCallback = new CallbackHandler($countCallback);
+        }
+
+        $this->itemsCallback = $itemsCallback;
+        $this->countCallback = $countCallback;
+    }
+
+    /**
+     * Returns an array of items for a page.
+     *
+     * Runs the callback defined as first constructor's argument.
+     *
+     * @param  int $offset Page offset
+     * @param  int $itemCountPerPage Number of items per page
+     * @return array
+     */
+    public function getItems($offset, $itemCountPerPage)
+    {
+        return $this->itemsCallback->call(array($offset, $itemCountPerPage));
+    }
+
+    /**
+     * Returns the total number of items.
+     *
+     * Runs the callback defined as second constructor's argument.
+     *
+     * @return int
+     */
+    public function count()
+    {
+        return $this->countCallback->call();
+    }
+}

tests/ZendTest/Paginator/Adapter/CallbackTest.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace ZendTest\Paginator\Adapter;
+
+use Zend\Paginator\Adapter\Callback;
+use Zend\Stdlib\CallbackHandler;
+
+/**
+ * @group      Zend_Paginator
+ */
+class CallbackTest extends \PHPUnit_Framework_TestCase
+{
+    public function testMustDefineTwoCallbacksOnContructor()
+    {
+        $itemsCallback = new CallbackHandler(function () {
+            return array();
+        });
+        $countCallback = new CallbackHandler(function () {
+            return 0;
+        });
+        $adapter = new Callback($itemsCallback, $countCallback);
+
+        $this->assertAttributeSame($itemsCallback, 'itemsCallback', $adapter);
+        $this->assertAttributeSame($countCallback, 'countCallback', $adapter);
+    }
+
+    public function testShouldAcceptAnyCallableOnContructor()
+    {
+        $itemsCallback = function () {
+            return range(1,  10);
+        };
+        $countCallback = 'rand';
+        $adapter = new Callback($itemsCallback, $countCallback);
+
+        $this->assertAttributeInstanceOf('Zend\Stdlib\CallbackHandler', 'itemsCallback', $adapter);
+        $this->assertAttributeInstanceOf('Zend\Stdlib\CallbackHandler', 'countCallback', $adapter);
+    }
+
+    public function testMustRunItemCallbackToGetItems()
+    {
+        $data = range(1,  10);
+        $itemsCallback = function () use ($data) {
+            return $data;
+        };
+        $countCallback = function () {};
+        $adapter = new Callback($itemsCallback, $countCallback);
+
+        $this->assertSame($data, $adapter->getItems(0, 10));
+    }
+
+    public function testMustPassArgumentsToGetItemCallback()
+    {
+        $data = array(0, 1, 2, 3);
+        $itemsCallback = function ($offset, $itemCountPerPage) {
+            return range($offset, $itemCountPerPage);
+        };
+        $countCallback = function () {};
+        $adapter = new Callback($itemsCallback, $countCallback);
+
+        $this->assertSame($data, $adapter->getItems(0, 3));
+    }
+
+    public function testMustRunCountCallbackToCount()
+    {
+        $count = 1988;
+        $itemsCallback = function () {};
+        $countCallback = function () use ($count) {
+            return $count;
+        };
+        $adapter = new Callback($itemsCallback, $countCallback);
+
+        $this->assertSame($count, $adapter->count());
+    }
+}