/**
* Return an array of search results matching the supplied
* keyword IDs in decreasing order of match quality.
* Keywords are supplied in an array of the following format:
* $keywords[PAPER_SEARCH_AUTHOR] = array('John', 'Doe');
* $keywords[PAPER_SEARCH_...] = array(...);
* $keywords[null] = array('Matches', 'All', 'Fields');
* @param $conference object The conference to search
* @param $keywords array List of keywords
* @param $publishedFrom object Search-from date
* @param $publishedTo object Search-to date
* @param $rangeInfo Information on the range of results to return
*/
function &retrieveResults(&$conference, &$keywords, $publishedFrom = null, $publishedTo = null, $rangeInfo = null)
{
// Fetch all the results from all the keywords into one array
// (mergedResults), where mergedResults[paper_id]
// = sum of all the occurences for all keywords associated with
// that paper ID.
// resultCount contains the sum of result counts for all keywords.
$mergedResults =& PaperSearch::_getMergedArray($conference, $keywords, $publishedFrom, $publishedTo, $resultCount);
// Convert mergedResults into an array (frequencyIndicator =>
// $paperId).
// The frequencyIndicator is a synthetically-generated number,
// where higher is better, indicating the quality of the match.
// It is generated here in such a manner that matches with
// identical frequency do not collide.
$results =& PaperSearch::_getSparseArray($mergedResults, $resultCount);
$totalResults = count($results);
// Use only the results for the specified page, if specified.
if ($rangeInfo && $rangeInfo->isValid()) {
$results = array_slice($results, $rangeInfo->getCount() * ($rangeInfo->getPage() - 1), $rangeInfo->getCount());
$page = $rangeInfo->getPage();
$itemsPerPage = $rangeInfo->getCount();
} else {
$page = 1;
$itemsPerPage = max($totalResults, 1);
}
// Take the range of results and retrieve the Paper, Conference,
// and associated objects.
$results =& PaperSearch::formatResults($results);
// Return the appropriate iterator.
import('core.VirtualArrayIterator');
$returner = new VirtualArrayIterator($results, $totalResults, $page, $itemsPerPage);
return $returner;
}