function compareRelatedRecords($a, $b)
{
//Get literary form to determine if we should compare editions
$literaryForm = '';
if (isset($this->fields['literary_form'])) {
if (is_array($this->fields['literary_form'])) {
$literaryForm = reset($this->fields['literary_form']);
} else {
$literaryForm = $this->fields['literary_form'];
}
}
//First sort by format
$format1 = $a['format'];
$format2 = $b['format'];
$formatComparison = strcasecmp($format1, $format2);
//Make sure that book is the very first format always
if ($formatComparison != 0) {
if ($format1 == 'Book') {
return -1;
} elseif ($format2 == 'Book') {
return 1;
}
}
if ($formatComparison == 0) {
//Put english titles before spanish by default
$languageComparison = GroupedWorkDriver::compareLanguagesForRecords($a, $b);
if ($languageComparison == 0) {
//Compare editions if available
$editionComparisonResult = GroupedWorkDriver::compareEditionsForRecords($literaryForm, $a, $b);
if ($editionComparisonResult == 0) {
//Put anything with a local copy higher
$localItemComparisonResult = GroupedWorkDriver::compareLocalItemsForRecords($a, $b);
if ($localItemComparisonResult == 0) {
//Anything that is available goes higher
$availabilityComparisonResults = GroupedWorkDriver::compareAvailabilityForRecords($a, $b);
if ($availabilityComparisonResults == 0) {
//All else being equal, sort by hold ratio
if ($a['holdRatio'] == $b['holdRatio']) {
//Hold Ratio is the same, last thing to check is the number of copies
if ($a['copies'] == $b['copies']) {
return 0;
} elseif ($a['copies'] > $b['copies']) {
return -1;
} else {
return 1;
}
} elseif ($a['holdRatio'] > $b['holdRatio']) {
return -1;
} else {
return 1;
}
} else {
return $availabilityComparisonResults;
}
} else {
return $localItemComparisonResult;
}
} else {
return $editionComparisonResult;
}
} else {
return $languageComparison;
}
} else {
return $formatComparison;
}
}