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Merge pull request #78 from lightsprint09/data-modifier-agregator
JoinedDataProvider
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129 changes: 129 additions & 0 deletions
129
Source/DataProvider/DataProvider/JoinedDataProvider.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| // | ||
| // Copyright (C) DB Systel GmbH. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a | ||
| // copy of this software and associated documentation files (the "Software"), | ||
| // to deal in the Software without restriction, including without limitation | ||
| // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
| // and/or sell copies of the Software, and to permit persons to whom the | ||
| // Software is furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
| // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| // DEALINGS IN THE SOFTWARE. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| /// Takes multiple data provider and aggregates them into a single on. | ||
| public final class JoinedDataProvider<Element>: DataProvider { | ||
|
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| /// Creates an instance of `JoinedDataProvider` by aggregating all given data providers | ||
| /// | ||
| /// - Parameter dataProviders: the data providers to aggregate. | ||
| public init<D: DataProvider>(dataProviders: [D]) where D.Element == Element { | ||
| self.dataProviders = dataProviders.map { AnyDataProvider($0) } | ||
| self.observers = dataProviders.enumerated().map { [unowned self] section, dataProvider in | ||
| dataProvider.observable.addObserver(observer: { self.translate(change: $0, section: section) }) | ||
| } | ||
| } | ||
|
|
||
| deinit { | ||
| dataProviders.enumerated().forEach { index, dataProvider in | ||
| dataProvider.observable.removeObserver(observer: observers[index]) | ||
| } | ||
| } | ||
|
|
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| /// An observable where one can subscribe to changes of data provider. | ||
| public var observable: DataProviderObservable { return innerObaseravle } | ||
|
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| /// Returns an object for a given index path. | ||
| /// | ||
| /// - Parameter indexPath: the index path to get the object for. | ||
| /// - Returns: the object at the given index path. | ||
| public func object(at indexPath: IndexPath) -> Element { | ||
| let (dataProvider, realSection) = dataProviderAndIndexOffset(ofSection: indexPath.section) | ||
| let realIndexPath = IndexPath(row: indexPath.row, section: realSection) | ||
|
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| return dataProvider.object(at: realIndexPath) | ||
| } | ||
|
|
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| /// Returns the number of items in a given section. | ||
| /// | ||
| /// - Parameter section: the section. | ||
| /// - Returns: number of items in the given section. | ||
| public func numberOfItems(inSection section: Int) -> Int { | ||
| let (dataProvider, realSection) = dataProviderAndIndexOffset(ofSection: section) | ||
| return dataProvider.numberOfItems(inSection: realSection) | ||
| } | ||
|
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| // Return the number of sections. | ||
| /// | ||
| /// - Returns: the number of sections. | ||
| public func numberOfSections() -> Int { | ||
| return dataProviders | ||
| .map { $0.numberOfSections() } | ||
| .reduce(0, +) | ||
| } | ||
|
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| private func dataProviderAndIndexOffset(ofSection section: Int) -> (AnyDataProvider<Element>, Int) { | ||
| var sectionI = 0 | ||
| for dataProvider in dataProviders { | ||
| if section >= sectionI && section < sectionI + dataProvider.numberOfSections() { | ||
| return (dataProvider, section - sectionI) | ||
| } | ||
| sectionI += dataProvider.numberOfSections() | ||
| } | ||
|
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| fatalError("Invalid index") | ||
| } | ||
|
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| private func translate(change: DataProviderChange, section: Int) { | ||
| switch change { | ||
| case .unknown: | ||
| innerObaseravle.send(updates: change) | ||
| case .changes(let changes): | ||
| let sectionOffset = dataProviders[0..<section].map { $0.numberOfSections() }.reduce(0, +) | ||
| innerObaseravle.send(updates: .changes(translate(changes: changes, sectionOffset: sectionOffset))) | ||
| case .viewUnrelatedChanges(let changes): | ||
| let sectionOffset = dataProviders[0..<section].map { $0.numberOfSections() }.reduce(0, +) | ||
| innerObaseravle.send(updates: .viewUnrelatedChanges(translate(changes: changes, sectionOffset: sectionOffset))) | ||
| } | ||
| } | ||
|
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| private func translate(changes: [DataProviderChange.Change], sectionOffset: Int) -> [DataProviderChange.Change] { | ||
| return changes.map { change in | ||
| switch change { | ||
| case .update(let indexPath): | ||
| return .update(IndexPath(row: indexPath.row, section: sectionOffset + indexPath.section)) | ||
| case .delete(let indexPath): | ||
| return .delete(IndexPath(row: indexPath.row, section: sectionOffset + indexPath.section)) | ||
| case .insert(let indexPath): | ||
| return .insert(IndexPath(row: indexPath.row, section: sectionOffset + indexPath.section)) | ||
| case .move(let sourceIndexPath, let destinationIndexPath): | ||
| return .move(IndexPath(row: sourceIndexPath.row, section: sectionOffset + sourceIndexPath.section), | ||
| IndexPath(row: destinationIndexPath.row, section: sectionOffset + destinationIndexPath.section)) | ||
| case .insertSection(let insertedSection): | ||
| return .insertSection(sectionOffset + insertedSection) | ||
| case .updateSection(let updatedSection): | ||
| return .updateSection(sectionOffset + updatedSection) | ||
| case .deleteSection(let deletedSection): | ||
| return .deleteSection(sectionOffset + deletedSection) | ||
| case .moveSection(let sourceSection, let destinationSource): | ||
| return .moveSection(sectionOffset + sourceSection, sectionOffset + destinationSource) | ||
| } | ||
| } | ||
| } | ||
|
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| private let dataProviders: [AnyDataProvider<Element>] | ||
| private let innerObaseravle = DefaultDataProviderObservable() | ||
| private var observers: [NSObjectProtocol]! | ||
|
|
||
| } |
87 changes: 87 additions & 0 deletions
87
Source/DataProvider/DataProvider/LazyTransformationDataProvider.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // | ||
| // Copyright (C) DB Systel GmbH. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a | ||
| // copy of this software and associated documentation files (the "Software"), | ||
| // to deal in the Software without restriction, including without limitation | ||
| // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
| // and/or sell copies of the Software, and to permit persons to whom the | ||
| // Software is furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
| // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| // DEALINGS IN THE SOFTWARE. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| /// Takes a data provider and transforms it with a given closure into a new data provider with a different type. | ||
| /// | ||
| /// - Note: Transformation will only execute when an object is requested by calling `object(at:)`. | ||
| public final class LazyTransformationDataProvider<TargetType>: DataProvider { | ||
|
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| // MARK: - Init | ||
|
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| public init<D: DataProvider>(dataProvider: D, transform: @escaping (D.Element) -> TargetType) { | ||
| self.numberOfSection = { dataProvider.numberOfSections() } | ||
| self.numberOfElements = { dataProvider.numberOfItems(inSection: $0) } | ||
| self.objectAtIndexPath = { transform(dataProvider.object(at: $0)) } | ||
| self.observable = dataProvider.observable | ||
| } | ||
|
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| // MARK: - Protocol DataProvider | ||
|
|
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| /// An observable where one can subscribe to changes of data provider. | ||
| public var observable: DataProviderObservable | ||
|
|
||
| /// Returns an object for a given index path. | ||
| /// | ||
| /// - Parameter indexPath: the index path to get the object for. | ||
| /// - Returns: the object at the given index path. | ||
| public func object(at indexPath: IndexPath) -> TargetType { | ||
| return objectAtIndexPath(indexPath) | ||
| } | ||
|
|
||
| /// Returns the number of items in a given section. | ||
| /// | ||
| /// - Parameter section: the section. | ||
| /// - Returns: number of items in the given section. | ||
| public func numberOfItems(inSection section: Int) -> Int { | ||
| return numberOfElements(section) | ||
| } | ||
|
|
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| /// Return the number of sections. | ||
| /// | ||
| /// - Returns: the number of sections. | ||
| public func numberOfSections() -> Int { | ||
| return numberOfSection() | ||
| } | ||
|
|
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| // MARK: - Private | ||
|
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| private let objectAtIndexPath: (_ indexPath: IndexPath) -> TargetType | ||
| private let numberOfSection: () -> Int | ||
| private let numberOfElements: (_ inSection: Int) -> Int | ||
|
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| } | ||
|
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| extension DataProvider { | ||
|
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| /// Lazy transforms the content with a given closure into a new data provider. | ||
| /// | ||
| /// - Parameter transform: the closure which transforms the element into the target value | ||
| /// - Returns: a `LazyTransformationDataProvider` which provides newly transformed objects. | ||
| /// | ||
| /// - SeeAlso: `LazyTransformationDataProvider` | ||
| public func lazyTransform<TargetType>(_ transform: @escaping (Element) -> TargetType) -> | ||
| LazyTransformationDataProvider<TargetType> { | ||
| return LazyTransformationDataProvider(dataProvider: self, transform: transform) | ||
| } | ||
| } |
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