FixedWidth/FileSystemLine.php at master · giftcards/FixedWidth · GitHub

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<?php
/**
 * Created by PhpStorm.
 * User: jderay
 * Date: 9/3/14
 * Time: 9:09 PM
 */

namespaceGiftcards\FixedWidth;


class FileSystemLine extends AbstractLine
{
protected$file;
protected$startPosition;
protected$length;

publicfunction__construct(\SplFileObject$fileObject, $startPosition, $length)
 {
$this->fileObject = $fileObject;
$this->startPosition = $startPosition;
$this->length = $length;
 }

publicfunction__toString()
 {
try {

returnparent::__toString();
 } catch (\OverflowException$e) {

return'';
 }
 }

publicfunctiongetLength()
 {
return$this->length;
 }

protectedfunctionloadSlice(Slice$slice)
 {
$this->checkSlice($slice);
$this->seekToStart($slice);
return$this->readFromFile($slice->getWidth());
 }

protectedfunctionsetSlice(Slice$slice, $value)
 {
$this->checkSlice($slice);
$this->seekToStart($slice);
$value = str_pad(substr($value, 0, $slice->getWidth()), $slice->getWidth(), '', STR_PAD_RIGHT);
$this->fileObject->fwrite($value);
return$this;
 }

protectedfunctionreadFromFile($length)
 {
$data = '';

for ($i = 0; $i < $length; $i++) {

$char = $this->fileObject->fgetc();

if ($this->fileObject->eof()) {

thrownew \OverflowException('overflowed the file');
 }

$data .= $char;
 }

return$data;
 }

protectedfunctionseekToStart(Slice$slice)
 {
$position = $this->fileObject->ftell();
$seekTo = ($this->startPosition + $slice->getStart()) - $position;

if ($seekTo == 0) {

return;
 }

$this->fileObject->fseek($seekTo, SEEK_CUR);
 }
}