Version 4.0.13.1

system/Patterns/UnionIterator.php

@@ -0,0 +1,157 @@
+<?php
+/**
+ * @brief		Union Iterator 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		14 Nov 2014
+ * @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;
+}
+
+/**
+ * Union Iterator Pattern
+ */
+class _UnionIterator implements \Iterator
+{
+	/**
+	 * @brief	Iterators
+	 */
+	protected $iterators;
+	
+	/**
+	 * @brief	Current lowest value
+	 */
+	protected $currentIteratorKey;
+	
+	/**
+	 * @brief	Order Direction
+	 */
+	protected $orderDirection;
+	
+	/**
+	 * Constructor
+	 *
+	 * @param	string	$orderDirection	"asc" or "desc"
+	 * @return	void
+	 */
+	public function __construct( $orderDirection )
+	{
+		$this->iterators = new \SplObjectStorage;
+		$this->orderDirection = $orderDirection;
+	}
+	
+	/**
+	 * Attach Iterator
+	 *
+	 * @param	\Traverable	$iterator	Iterator
+	 * @param	mixed		$key		The name of the property which contains the value used to compare positions
+	 * @return	void
+	 */
+	public function attachIterator( \Traversable $iterator, $key )
+	{		
+    	$this->iterators->attach( $iterator, $key );
+	}
+
+	/**
+	 * Rewind
+	 *
+	 * @return	void
+	 */
+	public function rewind()
+	{		
+    	foreach ( $this->iterators as $iterator )
+    	{
+	    	$iterator->rewind();
+    	}
+    	$this->currentLowestValue = NULL;
+    	$this->next();
+	}
+	
+	/**
+	 * Get current row
+	 *
+	 * @return	array
+	 */
+	public function current()
+	{
+		foreach ( $this->iterators as $k => $iterator )
+		{
+			if ( $k === $this->currentIteratorKey )
+			{
+				$return = $iterator->current();
+				$iterator->next();
+				return $return;
+			}
+		}
+	}
+	
+	/**
+	 * Get current key
+	 *
+	 * @return	mixed
+	 */
+	public function key()
+	{
+		return NULL;
+	}
+	
+	/**
+	 * Fetch next result
+	 *
+	 * @return	void
+	 */
+	public function next()
+	{
+		$this->currentIteratorKey = NULL;
+		$currentLowestValue = NULL;
+		
+		$values = array();
+		foreach ( $this->iterators as $k => $iterator )
+		{
+			if ( $iterator->valid() )
+			{
+				$col = $this->iterators->getInfo();
+				$current = $iterator->current();
+				if ( is_array( $current ) )
+				{
+					$value = $current[ $col ];
+				}
+				else
+				{
+					$value = $current->$col;
+				}
+				
+				if ( $value instanceof \IPS\DateTime )
+				{
+					$value = $value->getTimestamp();
+				}
+				
+				if ( $currentLowestValue === NULL or ( $this->orderDirection === 'asc' and $value < $currentLowestValue ) or ( $this->orderDirection === 'desc' and $value > $currentLowestValue ) )
+				{
+					$currentLowestValue = $value;
+					$this->currentIteratorKey = $k;
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Is the current row valid?
+	 *
+	 * @return	bool
+	 */
+	public function valid()
+	{
+		return $this->currentIteratorKey !== NULL;
+	}
+}