helly		Tue Nov 28 22:20:01 2006 UTC

  Added files:                 (Branch: PHP_5_2)
    /php-src/ext/spl/examples	callbackfilteriterator.inc 
  Log:
  - MFH: Add new example
  

http://cvs.php.net/viewvc.cgi/php-src/ext/spl/examples/callbackfilteriterator.inc?view=marku
p&rev=1.1
Index: php-src/ext/spl/examples/callbackfilteriterator.inc
+++ php-src/ext/spl/examples/callbackfilteriterator.inc
<?php

/** @file callbackfilteriterator.inc
 * @ingroup Examples
 * @brief class CallbackFilterIterator
 * @author  Marcus Boerger
 * @author  Kevin McArthur
 * @date    2006 - 2006
 *
 * SPL - Standard PHP Library
 */

/** @ingroup Examples
 * @brief   A non abstract FiletrIterator that uses a callback foreach element
 * @author  Marcus Boerger
 * @author  Kevin McArthur
 * @version 1.0
 */
class CallbackFilterIterator extends FilterIterator
{
	const USE_FALSE = 0;  /**< mode: accept no elements, no callback */
	const USE_TRUE  = 1;  /**< mode: accept all elements, no callback */
	const USE_VALUE = 2;  /**< mode: pass value to callback */
	const USE_KEY   = 3;  /**< mode: pass key to callback */
	const USE_BOTH  = 4;  /**< mode: pass value and key to callback */

	const REPLACE   = 0x00000001; /**< flag: pass key/value by reference */

	private $callback; /**< callback to use */
	private $mode;     /**< mode any of USE_VALUE, USE_KEY, USE_BOTH */
	private $flags;    /**< flags */
	private $key;      /**< key value */
	private $current;  /**< current value */

	/** Construct a CallbackFilterIterator
	 *
	 * @param it        inner iterator (iterator to filter)
	 * @param callback  callback function
	 * @param mode      @copy $mode
	 * @param flags     @copy $flags
	 */
	public function __construct(Iterator $it, $callback, $mode = self::USE_VALUE, $flags = 0)
	{
		parent::__construct($it);
		$this-> callback = $callback;
		$this-> mode     = $mode;
		$this-> flags    = $flags;
	}

	/** Call the filter callback
	 * @return result of filter callback
	 */
	public function accept()
	{
		$this-> key     = parent::key();
		$this-> current = parent::current();

		switch($this-> mode) {
		default:
		case self::USE_FALSE;
			return false;
		case self::USE_TRUE:
			return true;
		case self::USE_VALUE:
			if($this-> flags & self::REPLACE) {
				return (bool) call_user_func($this-> callback, &$this->current);
			} else {
				return (bool) call_user_func($this-> callback, $this->current);
			}
		case self::USE_KEY:
			if($this-> flags & self::REPLACE) {
				return (bool) call_user_func($this-> callback, &$this->key);
			} else {
				return (bool) call_user_func($this-> callback, $this->key);
			}
		case SELF::USE_BOTH:
			if($this-> flags & self::REPLACE) {
				return (bool) call_user_func($this-> callback, &$this->key, &$this->current);
			} else {
				return (bool) call_user_func($this-> callback, $this->key, $this->current);
			}
		}
	}

	/** @return @copy $key */
	function key()
	{
		return $this-> key;
	}

	/** @return @copy $current */
	function current()
	{
		return $this-> current;
	}

	/** @return @copy $mode */
	function getMode()
	{
		return $this-> mode;
	}

	/** @param $mode set new mode, @see $mode */
	function setMode($mode)
	{
		$this-> mode = $mode;
	}

	/** @return @copy $flags */
	function getFlags()
	{
		return $this-> flags;
	}

	/** @param $flags set new flags, @see @copy $flags */
	function setFlags($flags)
	{
		$this-> flags = $flags;
	}
}

?> 

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