fixed #155 added Quicklook like preview for attachments

MacPass/MPTemporaryFileStorageCenter.m

@@ -0,0 +1,61 @@
+//
+//  MPTemporaryFileStorageCleaner.m
+//  MacPass
+//
+//  Created by Michael Starke on 19/03/14.
+//  Copyright (c) 2014 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPTemporaryFileStorageCenter.h"
+#import "MPTemporaryFileStorage.h"
+
+@interface MPTemporaryFileStorageCenter () {
+  NSMutableArray *_storages;
+}
+
+@end
+
+@implementation MPTemporaryFileStorageCenter
+
++ (instancetype)defaultCenter {
+  static MPTemporaryFileStorageCenter *instance;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    instance = [[MPTemporaryFileStorageCenter alloc] init];
+  });
+  return instance;
+}
+
+- (instancetype)init {
+  self = [super init];
+  if(self) {
+    _storages = [[NSMutableArray alloc] init];
+  }
+  return self;
+}
+
+- (BOOL)hasPendingStorages {
+  return  [_storages count] > 0;
+}
+
+- (MPTemporaryFileStorage *)storageForBinary:(KPKBinary *)binary {
+  return [[MPTemporaryFileStorage alloc] initWithBinary:binary];
+}
+
+- (void)cleanupStorages {
+  for(MPTemporaryFileStorage *storage in _storages) {
+    [storage cleanupNow];
+  }
+  _storages = nil;
+}
+
+- (void)registerStorage:(MPTemporaryFileStorage *)storage {
+  [_storages addObject:storage];
+}
+
+- (void)unregisterStorage:(MPTemporaryFileStorage *)storage {
+  [storage cleanup];
+  [_storages removeObject:storage];
+}
+
+@end