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<?php
namespace SMW\Iterators;
use Exception;
use Iterator;
use SMW\Exception\FileNotFoundException;
/**
* @see http://php.net/manual/en/function.fgetcsv.php
*
* @license GNU GPL v2+
* @since 3.0
*/
class CsvFileIterator implements Iterator {
/**
* @var Resource
*/
private $handle;
/**
* @var boolean
*/
private $parseHeader;
/**
* @var []
*/
private $header = [];
/**
* @var string
*/
private $delimiter;
/**
* @var integer
*/
private $length;
/**
* @var int
*/
private $key = 0;
/**
* @since 3.0
*
* @param string $file
* @param boolean $parseHeader
* @param string $delimiter
* @param integer $length
*/
public function __construct( $file, $parseHeader = false, $delimiter = ",", $length = 8000 ) {
try {
$this->handle = fopen( $file, "r" );
} catch ( Exception $e ) {
throw new FileNotFoundException( 'File "'. $file . '" is not accessible.' );
}
$this->parseHeader = $parseHeader;
$this->delimiter = $delimiter;
$this->length = $length;
}
/**
* @since 3.0
*/
public function __destruct() {
if( is_resource( $this->handle ) ) {
fclose( $this->handle );
}
}
/**
* @since 3.0
*
* @return []
*/
public function getHeader() {
return $this->header;
}
/**
* Resets the file handle
*
* @since 3.0
*
* {@inheritDoc}
*/
public function rewind() {
$this->key = 0;
rewind( $this->handle );
}
/**
* Returns the current CSV row as a 2 dimensional array
*
* @since 3.0
*
* {@inheritDoc}
*/
public function current() {
// First iteration to match the header
if ( $this->parseHeader && $this->key == 0 ) {
$this->header = fgetcsv( $this->handle, $this->length, $this->delimiter );
}
$currentElement = fgetcsv( $this->handle, $this->length, $this->delimiter );
$this->key++;
return $currentElement;
}
/**
* Returns the current row number.
*
* @since 3.0
*
* {@inheritDoc}
*/
public function key() {
return $this->key;
}
/**
* Checks if the end of file is reached.
*
* @since 3.0
*
* {@inheritDoc}
*/
public function next() {
return !feof( $this->handle );
}
/**
* Checks if the next row is a valid row.
*
* @since 3.0
*
* {@inheritDoc}
*/
public function valid() {
if ( $this->next() ) {
return true;
}
fclose( $this->handle );
return false;
}
}
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