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//
// Query.swift
// CoreDataQueryInterface
//
// Created by Gregory Higley on 9/25/16.
// Copyright © 2016 Prosumma LLC. All rights reserved.
//
import CoreData
import Foundation
public struct Query<M: NSManagedObject, R: NSFetchRequestResult> where M: Entity {
public let builder: QueryBuilder<M>
public init(builder: QueryBuilder<M> = QueryBuilder<M>()) {
self.builder = builder
}
public func context(managedObjectContext: NSManagedObjectContext) -> Query<M, R> {
var builder = self.builder
builder.managedObjectContext = managedObjectContext
return Query<M, R>(builder: builder)
}
public func filter(_ predicate: NSPredicate) -> Query<M, R> {
var builder = self.builder
builder.predicates.append(predicate)
return Query<M, R>(builder: builder)
}
public func filter(_ format: String, _ args: CVarArg...) -> Query<M, R> {
return withVaList(args) { filter(NSPredicate(format: format, arguments: $0)) }
}
public func filter(_ block: (M.CDQIAttribute) -> NSPredicate) -> Query<M, R> {
let predicate = block(M.CDQIAttribute())
return filter(predicate)
}
public func refilter() -> Query<M, R> {
var builder = self.builder
builder.predicates = []
return Query<M, R>(builder: builder)
}
public func select<P: Sequence>(_ properties: P) -> Query<M, NSDictionary> where P.Iterator.Element: PropertyConvertible {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToFetch ??= []
builder.propertiesToFetch!.append(contentsOf: properties.map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func select(_ properties: PropertyConvertible...) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToFetch ??= []
builder.propertiesToFetch!.append(contentsOf: properties.map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func select(_ blocks: ((M.CDQIAttribute) -> PropertyConvertible)...) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToFetch ??= []
let attribute = M.CDQIAttribute()
builder.propertiesToFetch!.append(contentsOf: blocks.map{ $0(attribute).cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func select(_ block: (M.CDQIAttribute) -> [PropertyConvertible]) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToFetch ??= []
builder.propertiesToFetch!.append(contentsOf: block(M.CDQIAttribute()).map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func reselect() -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToFetch = nil
return Query<M, NSDictionary>(builder: builder)
}
public func groupBy<P: Sequence>(_ properties: P) -> Query<M, NSDictionary> where P.Iterator.Element: PropertyConvertible {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToGroupBy ??= []
builder.propertiesToGroupBy!.append(contentsOf: properties.map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func groupBy(_ properties: PropertyConvertible...) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToGroupBy ??= []
builder.propertiesToGroupBy!.append(contentsOf: properties.map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func groupBy(_ blocks: ((M.CDQIAttribute) -> PropertyConvertible)...) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToGroupBy ??= []
let attribute = M.CDQIAttribute()
builder.propertiesToGroupBy!.append(contentsOf: blocks.map { $0(attribute).cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func groupBy(_ block: (M.CDQIAttribute) -> [PropertyConvertible]) -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToGroupBy ??= []
builder.propertiesToGroupBy!.append(contentsOf: block(M.CDQIAttribute()).map{ $0.cdqiProperty })
return Query<M, NSDictionary>(builder: builder)
}
public func regroup() -> Query<M, NSDictionary> {
var builder = self.builder
builder.resultType = .dictionaryResultType
builder.propertiesToGroupBy = nil
return Query<M, NSDictionary>(builder: builder)
}
public func order<O: Sequence>(ascending: Bool, _ sortDescriptors: O) -> Query<M, R> where O.Iterator.Element: SortDescriptorConvertible {
var builder = self.builder
builder.sortDescriptors.append(contentsOf: sortDescriptors.map{ $0.cdqiSortDescriptor(ascending: ascending) })
return Query<M, R>(builder: builder)
}
public func order<O: Sequence>(_ sortDescriptors: O) -> Query<M, R> where O.Iterator.Element: SortDescriptorConvertible {
return order(ascending: true, sortDescriptors)
}
public func order(ascending: Bool, _ sortDescriptors: SortDescriptorConvertible...) -> Query<M, R> {
var builder = self.builder
builder.sortDescriptors.append(contentsOf: sortDescriptors.map{ $0.cdqiSortDescriptor(ascending: ascending) })
return Query<M, R>(builder: builder)
}
public func order(_ sortDescriptors: SortDescriptorConvertible...) -> Query<M, R> {
var builder = self.builder
builder.sortDescriptors.append(contentsOf: sortDescriptors.map{ $0.cdqiSortDescriptor(ascending: true) })
return Query<M, R>(builder: builder)
}
public func order(ascending: Bool = true, _ blocks: ((M.CDQIAttribute) -> SortDescriptorConvertible)...) -> Query<M, R> {
var builder = self.builder
let attribute = M.CDQIAttribute()
builder.sortDescriptors.append(contentsOf: blocks.map { $0(attribute).cdqiSortDescriptor(ascending: ascending) })
return Query<M, R>(builder: builder)
}
public func order(ascending: Bool = true, _ block: (M.CDQIAttribute) -> [SortDescriptorConvertible]) -> Query<M, R> {
var builder = self.builder
builder.sortDescriptors.append(contentsOf: block(M.CDQIAttribute()).map{ $0.cdqiSortDescriptor(ascending: ascending) })
return Query<M, R>(builder: builder)
}
public func reorder() -> Query<M, R> {
var builder = self.builder
builder.sortDescriptors = []
return Query<M, R>(builder: builder)
}
public func objects() -> Query<M, M> {
var builder = self.builder
builder.propertiesToFetch = nil
builder.propertiesToGroupBy = nil
builder.resultType = .managedObjectResultType
return Query<M, M>(builder: builder)
}
public func ids() -> Query<M, NSManagedObjectID> {
var builder = self.builder
builder.propertiesToFetch = nil
builder.propertiesToGroupBy = nil
builder.resultType = .managedObjectIDResultType
return Query<M, NSManagedObjectID>(builder: builder)
}
public func limit(_ fetchLimit: Int) -> Query<M, R> {
var builder = self.builder
builder.fetchLimit = fetchLimit
return Query<M, R>(builder: builder)
}
public func offset(_ fetchOffset: Int) -> Query<M, R> {
var builder = self.builder
builder.fetchOffset = fetchOffset
return Query<M, R>(builder: builder)
}
public func distinct(_ distinct: Bool = true) -> Query<M, NSDictionary> {
var builder = self.builder
builder.returnsDistinctResults = distinct
builder.resultType = .dictionaryResultType
return Query<M, NSDictionary>(builder: builder)
}
public func request(managedObjectContext: NSManagedObjectContext) -> NSFetchRequest<R> {
if #available(iOS 10, macOS 10.12, tvOS 10, watchOS 3, *) {
return builder.request()
} else {
let managedObjectModel = managedObjectContext.persistentStoreCoordinator!.managedObjectModel
return builder.request(managedObjectModel: managedObjectModel)
}
}
@available(iOS 10, macOS 10.12, tvOS 10, watchOS 3, *)
public func request() -> NSFetchRequest<R> {
return builder.request()
}
@available(*, deprecated: 5.0)
public func request(managedObjectModel: NSManagedObjectModel) -> NSFetchRequest<R> {
return builder.request(managedObjectModel: managedObjectModel)
}
public func count(managedObjectContext: NSManagedObjectContext? = nil) throws -> Int {
var builder = self.builder
builder.resultType = .countResultType
let managedObjectContext = managedObjectContext ?? builder.managedObjectContext!
return try managedObjectContext.count(for: request(managedObjectContext: managedObjectContext))
}
public func first(managedObjectContext: NSManagedObjectContext? = nil) throws -> R? {
let results = try limit(1).all(managedObjectContext: managedObjectContext)
assert(results.count < 2)
return results.count == 0 ? nil : results[0]
}
public func all(managedObjectContext: NSManagedObjectContext? = nil) throws -> [R] {
let managedObjectContext = managedObjectContext ?? builder.managedObjectContext!
return try managedObjectContext.fetch(request(managedObjectContext: managedObjectContext))
}
public func array<T>(_ property: PropertyConvertible, managedObjectContext: NSManagedObjectContext? = nil) throws -> [T] {
let results: [NSDictionary] = try reselect().select(property).all(managedObjectContext: managedObjectContext)
if results.count == 0 { return [] }
let key = results[0].allKeys[0]
return results.map { $0[key]! as! T }
}
public func array<T>(managedObjectContext: NSManagedObjectContext? = nil, _ block: (M.CDQIAttribute) -> PropertyConvertible) throws -> [T] {
return try array(block(M.CDQIAttribute()), managedObjectContext: managedObjectContext)
}
public func value<T>(_ property: PropertyConvertible, managedObjectContext: NSManagedObjectContext? = nil) throws -> T? {
let results: [T] = try limit(1).array(property)
return results.count == 0 ? nil : results[0]
}
public func value<T>(managedObjectContext: NSManagedObjectContext? = nil, _ block: (M.CDQIAttribute) -> PropertyConvertible) throws -> T? {
return try value(block(M.CDQIAttribute()), managedObjectContext: managedObjectContext)
}
public func exists(managedObjectContext: NSManagedObjectContext? = nil) throws -> Bool {
return try limit(1).count(managedObjectContext: managedObjectContext) > 0
}
}