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<?php
namespace SMW\Iterators;
use ArrayIterator;
use Countable;
use Iterator;
use ResultWrapper;
use RuntimeException;
use SeekableIterator;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class ResultIterator implements Iterator, Countable, SeekableIterator {
/**
* @var ResultWrapper
*/
public $res;
/**
* @var integer
*/
public $position;
/**
* @var mixed
*/
public $current;
/**
* @var boolean
*/
public $numRows = false;
/**
* @since 2.5
*
* @param Iterator|array $res
*/
public function __construct( $res ) {
if ( !$res instanceof Iterator && !is_array( $res ) ) {
throw new RuntimeException( "Expected an Iterator or array!" );
}
// @see MediaWiki's ResultWrapper
if ( $res instanceof Iterator && method_exists( $res , 'numRows' ) ) {
$this->numRows = true;
}
if ( is_array( $res ) ) {
$res = new ArrayIterator( $res );
}
$this->res = $res;
$this->position = 0;
$this->setCurrent( $this->res->current() );
}
/**
* @see Countable::count
* @since 2.5
*
* {@inheritDoc}
*/
public function count() {
return $this->numRows ? $this->res->numRows() : $this->res->count();
}
/**
* @see SeekableIterator::seek
* @since 2.5
*
* {@inheritDoc}
*/
public function seek( $position ) {
$this->res->seek( $position );
$this->setCurrent( $this->res->current() );
$this->position = $position;
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function current() {
return $this->current;
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function key() {
return $this->position;
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function next() {
$row = $this->res->next();
$this->setCurrent( $row );
$this->position++;
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function rewind() {
$this->res->rewind();
$this->position = 0;
$this->setCurrent( $this->res->current() );
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function valid() {
return $this->current !== false;
}
protected function setCurrent( $row ) {
if ( $row === false || $row === null ) {
$this->current = false;
} else {
$this->current = $row;
}
}
}
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