Merge branch 'master' of git://github.com/zendframework/zf2

src/BigInteger/Adapter/AdapterInterface.php

@@ -85,6 +85,14 @@ public function pow($operand, $exp);
      */
     public function sqrt($operand);
 
+    /**
+     * Get absolute value of a big integer
+     *
+     * @param  string $operand
+     * @return string
+     */
+    public function abs($operand);
+
     /**
      * Get modulus of a big integer
      *

src/BigInteger/Adapter/Bcmath.php

@@ -157,6 +157,20 @@ public function sqrt($operand)
         return bcsqrt($operand);
     }
 
+    /**
+     * Get absolute value of a big integer
+     *
+     * @param  string $operand
+     * @return string
+     */
+    public function abs($operand)
+    {
+        if ('-' == $operand[0]) {
+            return substr($operand, 1);
+        }
+        return $operand;
+    }
+
     /**
      * Get modulus of a big integer
      *

src/BigInteger/Adapter/Gmp.php

@@ -138,6 +138,18 @@ public function sqrt($operand)
         return gmp_strval($result);
     }
 
+    /**
+     * Get absolute value of a big integer
+     *
+     * @param  string $operand
+     * @return string
+     */
+    public function abs($operand)
+    {
+        $result = gmp_abs($operand);
+        return gmp_strval($result);
+    }
+
     /**
      * Get modulus of a big integer
      *

src/BigInteger/AdapterPluginManager.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to [email protected] so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Math
+ * @subpackage BigInteger
+ * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+
+namespace Zend\Math\BigInteger;
+
+use Zend\ServiceManager\AbstractPluginManager;
+
+/**
+ * Plugin manager implementation for BigInteger adapters.
+ *
+ * Enforces that adapters retrieved are instances of
+ * Adapter\AdapterInterface. Additionally, it registers a number of default 
+ * adapters available.
+ *
+ * @category   Zend
+ * @package    Zend_Math
+ * @subpackage BigInteger
+ * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class AdapterPluginManager extends AbstractPluginManager
+{
+    /**
+     * Default set of adapters
+     * 
+     * @var array
+     */
+    protected $invokableClasses = array(
+        'bcmath' => 'Zend\Math\BigInteger\Adapter\Bcmath',
+        'gmp'    => 'Zend\Math\BigInteger\Adapter\Gmp',
+    );
+
+    /**
+     * Validate the plugin
+     *
+     * Checks that the adapter loaded is an instance of Adapter\AdapterInterface.
+     * 
+     * @param  mixed $plugin 
+     * @return void
+     * @throws Exception\RuntimeException if invalid
+     */
+    public function validatePlugin($plugin)
+    {
+        if ($plugin instanceof Adapter\AdapterInterface) {
+            // we're okay
+            return;
+        }
+
+        throw new Exception\RuntimeException(sprintf(
+            'Plugin of type %s is invalid; must implement %s\Adapter\AdapterInterface',
+            (is_object($plugin) ? get_class($plugin) : gettype($plugin)),
+            __NAMESPACE__
+        ));
+    }
+}
+