/**
* {@inheritdoc}
* @param null $rootElement
*
* @return array
* @throws \Exception
*/
public function extract($rootElement = null)
{
if ($rootElement == null) {
$rootElement = $this->crawler->getPage()->find('xpath', $this->rules->extraction->resultXPaths[0]);
}
if ($rootElement == null) {
throw new \Exception('Multiple Extractor Error : Could not select root element');
}
$rows = $rootElement->findAll('xpath', $this->rules->extraction->rowXPaths[0]);
$results = array();
foreach ($rows as $row) {
$result = parent::extract($row);
if ($this->stopAtHash != null && $this->stopAtHash == $result['hash']) {
$this->crawler->maxPages = 1;
// Forcefully break the crawling
break;
}
if (!count($result)) {
continue;
}
$results[] = $result;
}
return $results;
}
/**
* {@inheritdoc}
* @param null $rootElement
*
* @return array
* @throws \Exception
*/
public function extract($rootElement = null, $exitingRows = null)
{
// Make stopAtHash an array if it is not an array
if (!is_array($this->stopAtHash)) {
$this->stopAtHash = [$this->stopAtHash];
}
$currentUrlNode = $this->crawler->getPage();
if ($rootElement == null) {
$rootElement = $currentUrlNode->find('xpath', $this->rules->extraction->resultXPaths[0]);
}
// If javascript is enabled then sleep for a second so that the contents that might be loaded would be loaded properly
// todo : make 1 sec dynamic or check if dom is on ready state
if ($rootElement == null && $this->crawler->javaScriptRequired == true) {
$retryCount = 0;
while ($retryCount <= 3 || $rootElement == null) {
sleep(1);
$rootElement = $currentUrlNode->find('xpath', $this->rules->extraction->resultXPaths[0]);
$retryCount++;
}
}
if ($rootElement == null) {
throw new \Exception('Multiple Extractor Error : Could not select root element');
}
$rows = $rootElement->findAll('xpath', $this->rules->extraction->rowXPaths[0]);
$results = array();
$counter = 0;
$hashMatched = 0;
foreach ($rows as $row) {
if ($exitingRows > 0 && $counter < $exitingRows && $this->crawler->javaScriptRequired) {
$counter++;
continue;
}
$result = parent::extract($row);
if (!count($result)) {
continue;
}
if ($this->stopAtHash != null && in_array($result['hash'], $this->stopAtHash)) {
$hashMatched++;
if ($hashMatched >= $this->minHashMatch) {
$this->crawler->maxPages = 1;
// Forcefully break the crawling
break;
}
continue;
}
// Ignore duplicate rows caused by loading of the new records to the same page using ajax call
// Todo : this has to be replaced by deleting the recorded rows so that new records will always be there and hence no redundancy
$recordExists = false;
foreach ($results as $res) {
if ($res['hash'] == $result['hash']) {
$recordExists = true;
break;
}
}
if ($recordExists) {
continue;
}
$results[] = $result;
$counter++;
}
return $results;
}