/**
* Imports the CSV file specified by $pathToFile
* @param string $pathToFile
* @return Graph
*/
public function import($pathToFile)
{
$lines = IOUtil::readCsvFile($pathToFile, $this->hasHeader, $this->encoding, $this->delimiter, $this->enclosure, null, null, $this->offset);
$urls = [];
$graph = new Graph();
foreach ($lines as $nr => $line) {
if (!array_key_exists($this->sourceColumn, $line) || !array_key_exists($this->destinationColumn, $line)) {
continue;
}
if (!parse_url($line[$this->sourceColumn]) || !parse_url($line[$this->destinationColumn])) {
continue;
}
$urlFrom = trim($line[$this->sourceColumn]);
if (!array_key_exists($urlFrom, $urls)) {
$urls[$urlFrom] = new Node($urlFrom);
}
$urlTo = trim($line[$this->destinationColumn]);
if (!array_key_exists($urlTo, $urls)) {
$urls[$urlTo] = new Node($urlTo);
}
$edge = new Edge($urls[$urlFrom], $urls[$urlTo]);
$graph->addEdge($edge);
}
return $graph;
}
