/**
* Extract data from a PDF document and add this to the Lucene index.
*
* @param string $pdfPath The path to the PDF document.
* @param Zend_Search_Lucene_Proxy $luceneIndex The Lucene index object.
* @return Zend_Search_Lucene_Proxy
*/
public static function index($pdfPath, $luceneIndex)
{
// Load the PDF document.
$pdf = Zend_Pdf::load($pdfPath);
$key = md5($pdfPath);
/**
* Set up array to contain the document index data.
* The Filename will be used to retrive the document if it is found in
* the search resutls.
* The Key will be used to uniquely identify the document so we can
* delete it from the search index.
*/
$indexValues = array('Filename' => $pdfPath, 'Key' => $key, 'Title' => '', 'Author' => '', 'Subject' => '', 'Keywords' => '', 'Creator' => '', 'Producer' => '', 'CreationDate' => '', 'ModDate' => '', 'Contents' => '');
// Go through each meta data item and add to index array.
foreach ($pdf->properties as $meta => $metaValue) {
switch ($meta) {
case 'Title':
$indexValues['Title'] = $pdf->properties['Title'];
break;
case 'Subject':
$indexValues['Subject'] = $pdf->properties['Subject'];
break;
case 'Author':
$indexValues['Author'] = $pdf->properties['Author'];
break;
case 'Keywords':
$indexValues['Keywords'] = $pdf->properties['Keywords'];
break;
case 'CreationDate':
$dateCreated = $pdf->properties['CreationDate'];
$distance = substr($dateCreated, 16, 2);
if (!is_long($distance)) {
$distance = null;
}
// Convert date from the PDF format of D:20090731160351+01'00'
$dateCreated = mktime(substr($dateCreated, 10, 2), substr($dateCreated, 12, 2), substr($dateCreated, 14, 2), substr($dateCreated, 6, 2), substr($dateCreated, 8, 2), substr($dateCreated, 2, 4), $distance);
//distance
$indexValues['CreationDate'] = date('Ymd', $dateCreated);
break;
case 'Date':
$indexValues['Date'] = $pdf->properties['Date'];
break;
}
}
/**
* Parse the contents of the PDF document and pass the text to the
* contents item in the $indexValues array.
*/
$pdfParse = new App_Search_Helper_PdfParser();
$indexValues['Contents'] = $pdfParse->pdf2txt($pdf->render());
// Create the document using the values
$doc = new App_Search_Lucene_Document($indexValues);
if ($doc !== false) {
// If the document creation was sucessful then add it to our index.
$luceneIndex->addDocument($doc);
}
// Return the Lucene index object.
return $luceneIndex;
}
/**
* Add a document to the index.
*
* @return void
* @access private
* @static
*
* @author Etienne de Longeaux <*****@*****.**>
* @since 2012-06-11
*/
public static function addDocument()
{
// Search for documents with the same Key value.
$term = new \Zend_Search_Lucene_Index_Term(self::$_doc->Key, 'Key');
$docIds = self::$_index->termDocs($term);
// Delete any documents found.
foreach ($docIds as $id) {
self::$_index->delete($id);
}
if (self::$_doc instanceof \Zend_Search_Lucene_Document) {
self::$_index->addDocument(self::$_doc);
}
}
