refactor and cleanup [skip ci]

submodules/Postbox/Sources/ItemCollectionInfoView.swift

@@ -0,0 +1,65 @@
+import Foundation
+
+final class MutableItemCollectionInfoView: MutablePostboxView {
+    let id: ItemCollectionId
+    var info: ItemCollectionInfo?
+    
+    init(postbox: Postbox, id: ItemCollectionId) {
+        self.id = id
+        let infos = postbox.itemCollectionInfoTable.getInfos(namespace: id.namespace)
+        for (_, infoId, info) in infos {
+            if id == infoId {
+                self.info = info
+                break
+            }
+        }
+    }
+    
+    func replay(postbox: Postbox, transaction: PostboxTransaction) -> Bool {
+        if transaction.currentItemCollectionInfosOperations.isEmpty {
+            return false
+        }
+        
+        var updated = false
+        
+        var reloadInfosNamespaces = Set<ItemCollectionId.Namespace>()
+        for operation in transaction.currentItemCollectionInfosOperations {
+            switch operation {
+                case let .replaceInfos(namespace):
+                    reloadInfosNamespaces.insert(namespace)
+            }
+        }
+        
+        if !reloadInfosNamespaces.isEmpty && reloadInfosNamespaces.contains(self.id.namespace) {
+            updated = true
+            
+            let infos = postbox.itemCollectionInfoTable.getInfos(namespace: id.namespace)
+            var found = false
+            for (_, infoId, info) in infos {
+                if id == infoId {
+                    self.info = info
+                    found = true
+                    break
+                }
+            }
+            if !found {
+                self.info = nil
+            }
+        }
+        return updated
+    }
+    
+    func immutableView() -> PostboxView {
+        return ItemCollectionInfoView(self)
+    }
+}
+
+public final class ItemCollectionInfoView: PostboxView {
+    public let id: ItemCollectionId
+    public let info: ItemCollectionInfo?
+    
+    init(_ view: MutableItemCollectionInfoView) {
+        self.id = view.id
+        self.info = view.info
+    }
+}