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<?php
namespace FilesSearch;
use NotificationCenter;
/**
* This class observes changes in file refs and folders and re-indexes
* if applicable.
*
* @license GPL2 or any later version
*
* @since Stud.IP 4.1
*/
class NotificationObserver
{
/**
* Observe every change in files, file refs and folders.
*/
public static function initialize()
{
NotificationCenter::addObserver(self::class, 'observeFileRef', 'FileRefDidCreate');
NotificationCenter::addObserver(self::class, 'observeFileRef', 'FileRefDidDelete');
NotificationCenter::addObserver(self::class, 'observeFileRef', 'FileRefDidUpdate');
NotificationCenter::addObserver(self::class, 'observeFolder', 'FolderDidCreate');
NotificationCenter::addObserver(self::class, 'observeFolder', 'FolderDidDelete');
NotificationCenter::addObserver(self::class, 'observeFolder', 'FolderDidUpdate');
}
/**
* Observe changes of FileRefs. Depending on the event either
* create, drop or update the index.
*
* @param FileRef $fileRef the observed file
*/
public static function observeFileRef($event, \FileRef $fileRef)
{
switch ($event) {
case 'FileRefDidCreate':
FilesIndexManager::indexFile($fileRef);
break;
case 'FileRefDidDelete':
FilesIndexManager::dropIndexForFile($fileRef);
break;
case 'FileRefDidUpdate':
if (self::isFileRefStale($fileRef)) {
FilesIndexManager::dropIndexForFile($fileRef);
FilesIndexManager::indexFile($fileRef);
}
break;
}
}
/**
* Observe changes of Folders. Depending on the event either
* create, drop or update the indexes.
*
* @param Folder $folder the observed folder
*/
public static function observeFolder($event, \Folder $folder)
{
switch ($event) {
case 'FolderDidCreate':
FilesIndexManager::indexFolder($folder);
break;
case 'FolderDidDelete':
FilesIndexManager::dropIndexForFolder($folder);
break;
case 'FolderDidUpdate':
if (self::isFolderStale($folder)) {
FilesIndexManager::dropIndexForFolder($folder);
FilesIndexManager::indexFolder($folder);
}
break;
}
}
private static function isFileRefStale(\FileRef $fileRef)
{
return self::isStale($fileRef, ['user_id', 'mkdate', 'chdate', 'folder_id', 'name', 'description']);
}
private static function isFolderStale(\Folder $folder)
{
return self::isStale($folder, ['range_id', 'range_type', 'folder_type']);
}
private static function isStale(\SimpleORMap $resource, array $fields)
{
foreach ($fields as $field) {
if ($resource->isFieldDirty($field)) {
return true;
}
}
return false;
}
}
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