refactor and cleanup [skip ci]

submodules/Postbox/Sources/ItemCollectionIdsView.swift

@@ -0,0 +1,55 @@
+import Foundation
+
+final class MutableItemCollectionIdsView: MutablePostboxView {
+    let namespaces: [ItemCollectionId.Namespace]
+    var idsByNamespace: [ItemCollectionId.Namespace: Set<ItemCollectionId>]
+    
+    init(postbox: Postbox, namespaces: [ItemCollectionId.Namespace]) {
+        self.namespaces = namespaces
+        
+        var idsByNamespace: [ItemCollectionId.Namespace: Set<ItemCollectionId>] = [:]
+        for namespace in namespaces {
+            let ids = postbox.itemCollectionInfoTable.getIds(namespace: namespace)
+            idsByNamespace[namespace] = Set(ids)
+        }
+        self.idsByNamespace = idsByNamespace
+    }
+    
+    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 {
+            for namespace in self.namespaces {
+                if reloadInfosNamespaces.contains(namespace) {
+                    updated = true
+                    let ids = postbox.itemCollectionInfoTable.getIds(namespace: namespace)
+                    self.idsByNamespace[namespace] = Set(ids)
+                }
+            }
+        }
+        return updated
+    }
+    
+    func immutableView() -> PostboxView {
+        return ItemCollectionIdsView(self)
+    }
+}
+
+public final class ItemCollectionIdsView: PostboxView {
+    public let idsByNamespace: [ItemCollectionId.Namespace: Set<ItemCollectionId>]
+    
+    init(_ view: MutableItemCollectionIdsView) {
+        self.idsByNamespace = view.idsByNamespace
+    }
+}