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Code Issues 95 Packages Projects Releases 10 Wiki Activity

optimizations

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This commit is contained in:
John Estropia
2019-11-29 20:09:43 +09:00
parent 4ee1b04523
commit b12dba4d15
7 changed files with 92 additions and 25 deletions
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62
Sources/Internals.DiffableDataSourceSnapshot.swift
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@@ -121,6 +121,16 @@ extension Internals {
return self.structure.allSectionIDs.firstIndex(of: identifier)
}
func isReloaded(sectionID: String) -> Bool? {
return self.structure.isReloaded(sectionID: sectionID)
}
func isReloaded(itemID: NSManagedObjectID) -> Bool? {
return self.structure.isReloaded(itemID: itemID)
}
mutating func appendItems(_ identifiers: [NSManagedObjectID], toSection sectionIdentifier: String?) {
self.structure.append(itemIDs: identifiers, to: sectionIdentifier)
@@ -329,6 +339,24 @@ extension Internals {
return self.sections.lazy.flatMap({ $0.elements }).map({ $0.differenceIdentifier })
}
func isReloaded(sectionID: String) -> Bool? {
return self.sections.first(where: { $0.differenceIdentifier == sectionID })?.isReloaded
}
func isReloaded(itemID: NSManagedObjectID) -> Bool? {
for section in self.sections {
guard let item = section.elements.first(where: { $0.differenceIdentifier == itemID }) else {
return nil
}
return item.isReloaded
}
return nil
}
func items(in sectionID: String) -> [NSManagedObjectID] {
guard let sectionIndex = self.sectionIndex(of: sectionID) else {
@@ -340,7 +368,7 @@ extension Internals {
func section(containing itemID: NSManagedObjectID) -> String? {
return self.itemPositionMap()[itemID]?.section.differenceIdentifier
return self.itemPositionMap(itemID)?.section.differenceIdentifier
}
mutating func append(itemIDs: [NSManagedObjectID], to sectionID: String?) {
@@ -369,7 +397,7 @@ extension Internals {
mutating func insert(itemIDs: [NSManagedObjectID], before beforeItemID: NSManagedObjectID) {
guard let itemPosition = self.itemPositionMap()[beforeItemID] else {
guard let itemPosition = self.itemPositionMap(beforeItemID) else {
Internals.abort("Item \(beforeItemID) does not exist")
}
@@ -380,7 +408,7 @@ extension Internals {
mutating func insert(itemIDs: [NSManagedObjectID], after afterItemID: NSManagedObjectID) {
guard let itemPosition = self.itemPositionMap()[afterItemID] else {
guard let itemPosition = self.itemPositionMap(afterItemID) else {
Internals.abort("Item \(afterItemID) does not exist")
}
@@ -433,7 +461,7 @@ extension Internals {
Internals.abort("Item \(itemID) does not exist")
}
guard let itemPosition = self.itemPositionMap()[beforeItemID] else {
guard let itemPosition = self.itemPositionMap(beforeItemID) else {
Internals.abort("Item \(beforeItemID) does not exist")
}
@@ -447,7 +475,7 @@ extension Internals {
Internals.abort("Item \(itemID) does not exist")
}
guard let itemPosition = self.itemPositionMap()[afterItemID] else {
guard let itemPosition = self.itemPositionMap(afterItemID) else {
Internals.abort("Item \(afterItemID) does not exist")
}
@@ -556,7 +584,7 @@ extension Internals {
@discardableResult
private mutating func remove(itemID: NSManagedObjectID) -> Item? {
guard let itemPosition = self.itemPositionMap()[itemID] else {
guard let itemPosition = self.itemPositionMap(itemID) else {
return nil
}
@@ -574,6 +602,28 @@ extension Internals {
return self.sections.remove(at: sectionIndex)
}
private func itemPositionMap(_ itemID: NSManagedObjectID) -> ItemPosition? {
let sections = self.sections
for (sectionIndex, section) in sections.enumerated() {
for (itemRelativeIndex, item) in section.elements.enumerated() {
guard item.differenceIdentifier == itemID else {
continue
}
return ItemPosition(
item: item,
itemRelativeIndex: itemRelativeIndex,
section: section,
sectionIndex: sectionIndex
)
}
}
return nil
}
private func itemPositionMap() -> [NSManagedObjectID: ItemPosition] {
return self.sections.enumerated().reduce(into: [:]) { result, section in