Module refactoring

submodules/TelegramPresentationData/Sources/PresentationsResourceCache.swift

@@ -0,0 +1,52 @@
+import Foundation
+import UIKit
+import SwiftSignalKit
+
+private final class PresentationsResourceCacheHolder {
+    var images: [Int32: UIImage] = [:]
+}
+
+private final class PresentationsResourceAnyCacheHolder {
+    var objects: [Int32: AnyObject] = [:]
+}
+
+public final class PresentationsResourceCache {
+    private let imageCache = Atomic<PresentationsResourceCacheHolder>(value: PresentationsResourceCacheHolder())
+    private let objectCache = Atomic<PresentationsResourceAnyCacheHolder>(value: PresentationsResourceAnyCacheHolder())
+    
+    public func image(_ key: Int32, _ theme: PresentationTheme, _ generate: (PresentationTheme) -> UIImage?) -> UIImage? {
+        let result = self.imageCache.with { holder -> UIImage? in
+            return holder.images[key]
+        }
+        if let result = result {
+            return result
+        } else {
+            if let image = generate(theme) {
+                self.imageCache.with { holder -> Void in
+                    holder.images[key] = image
+                }
+                return image
+            } else {
+                return nil
+            }
+        }
+    }
+    
+    public func object(_ key: Int32, _ theme: PresentationTheme, _ generate: (PresentationTheme) -> AnyObject?) -> AnyObject? {
+        let result = self.objectCache.with { holder -> AnyObject? in
+            return holder.objects[key]
+        }
+        if let result = result {
+            return result
+        } else {
+            if let object = generate(theme) {
+                self.objectCache.with { holder -> Void in
+                    holder.objects[key] = object
+                }
+                return object
+            } else {
+                return nil
+            }
+        }
+    }
+}