<?php

abstract class UserArray implements Iterator {
	static function newFromResult( $res ) {
		$userArray = null;
		if ( !wfRunHooks( 'UserArrayFromResult', array( &$userArray, $res ) ) ) {
			return null;
		}
		if ( $userArray === null ) {
			$userArray = self::newFromResult_internal( $res );
		}
		return $userArray;
	}

	protected static function newFromResult_internal( $res ) {
		$userArray = new UserArrayFromResult( $res );
		return $userArray;
	}
}

class UserArrayFromResult extends UserArray {
	var $res;
	var $key, $current;

	function __construct( $res ) {
		$this->res = $res;
		$this->key = 0;
		$this->setCurrent( $this->res->current() );
	}

	protected function setCurrent( $row ) {
		if ( $row === false ) {
			$this->current = false;
		} else {
			$this->current = User::newFromRow( $row );
		}
	}

	public function count() {
		return $this->res->numRows();
	}

	function current() {
		return $this->current;
	}

	function key() {
		return $this->key;
	}

	function next() {
		$row = $this->res->next();
		$this->setCurrent( $row );
		$this->key++;
	}

	function rewind() {
		$this->res->rewind();
		$this->key = 0;
		$this->setCurrent( $this->res->current() );
	}

	function valid() {
		return $this->current !== false;
	}
}
