Version 4.0.13.1

system/Patterns/Singleton.php

@@ -0,0 +1,141 @@
+<?php
+/**
+ * @brief		Singleton Pattern
+ * @author		<a href='http://www.invisionpower.com'>Invision Power Services, Inc.</a>
+ * @copyright	(c) 2001 - SVN_YYYY Invision Power Services, Inc.
+ * @license		http://www.invisionpower.com/legal/standards/
+ * @package		IPS Social Suite
+ * @since		18 Feb 2013
+ * @version		SVN_VERSION_NUMBER
+ */
+
+namespace IPS\Patterns;
+
+/* To prevent PHP errors (extending class does not exist) revealing path */
+if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
+{
+	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
+	exit;
+}
+
+/**
+ * Singleton Pattern
+ */
+class _Singleton implements \Iterator
+{
+	/**
+	 * @brief	Singleton Instances
+	 * @note	This needs to be declared in any child classes as well, only declaring here for editor code-complete/error-check functionality
+	 */
+	protected static $instance = NULL;
+
+	/**
+	 * Get instance
+	 *
+	 * @return	static
+	 */
+	public static function i()
+	{
+		if( static::$instance === NULL )
+		{
+			$classname = get_called_class();
+			static::$instance = new $classname;
+		}
+		
+		return static::$instance;
+	}
+	
+	/**
+	 * @brief	Data Store
+	 */
+	protected $data = array();
+
+	/**
+	 * Magic Method: Get
+	 *
+	 * @param	mixed	$key	Key
+	 * @return	mixed	Value from the datastore
+	 */
+	public function __get( $key )
+	{	
+		if( !isset( $this->data[ $key ] ) )
+		{
+			return NULL;
+		}
+		
+		return $this->data[ $key ];
+	}
+	
+	/**
+	 * Magic Method: Set
+	 *
+	 * @param	mixed	$key	Key
+	 * @param	mixed	$value	Value
+	 * @return	void
+	 */
+	public function __set( $key, $value )
+	{
+		$this->data[ $key ] = $value;
+	}
+	
+	/**
+	 * Magic Method: Isset
+	 *
+	 * @param	mixed	$key	Key
+	 * @return	bool
+	 */
+	public function __isset( $key )
+	{
+		return isset( $this->data[ $key ] );
+	}
+	
+	/**
+	 * Iterator: Rewind
+	 *
+	 * @return	void
+	 */
+	function rewind()
+	{
+        reset( $this->data );
+    }
+    
+    /**
+     * Iterator: Current
+     *
+     * @return	mixed
+     */
+    function current()
+    {
+        return current( $this->data );
+    }
+    
+    /**
+     * Iterator: Key
+     *
+     * @return	mixed
+     */
+    function key()
+    {
+        return key( $this->data );
+    }
+    
+    /**
+     * Iterator: Next
+     *
+     * @return	void
+     */
+    function next()
+    {
+       next( $this->data );
+    }
+
+    /**
+     * Iterator: Valid
+     *
+     * @return	bool
+     */
+    function valid()
+    {
+    	return key( $this->data ) !== null;
+    }
+}