/**
* @return $this
*/
public function prepare()
{
$this->progress = new ProgressBar($this->output, $this->reader->count());
$this->progress->setFormat($this->verbosity);
$this->progress->setRedrawFrequency($this->redrawFrequency);
$this->progress->start();
return $this;
}
/**
* Add a mapping to the workflow
*
* If we can get the field names from the reader, they are just to check the
* $fromField against.
*
* @param string $fromField Field to map from
* @param string|array $toField Field or array to map to
*
* @return $this
* @throws \InvalidArgumentException
*/
public function addMapping($fromField, $toField)
{
if (count($this->reader->getFields()) > 0) {
if (!in_array($fromField, $this->reader->getFields())) {
throw new \InvalidArgumentException("{$fromField} is an invalid field");
}
}
$this->getMappingItemConverter()->addMapping($fromField, $toField);
return $this;
}
/**
* Count elements of an object
* The return value is cast to an integer.
*/
public function count()
{
return $this->leftReader->count();
}