Added aggregate function querying and deletion querying

2026-03-17 23:14:05 +01:00 · 2015-03-05 14:24:26 +08:00
parent 55dee6ec2f
commit 1fae78434f
20 changed files with 730 additions and 84 deletions
--- a/HardcoreData/AggregateFunction.swift
+++ b/HardcoreData/AggregateFunction.swift
@@ -0,0 +1,99 @@
+//
+//  AggregateFunction.swift
+//  HardcoreData
+//
+//  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
+import CoreData
+
+
+// MARK: - AggregateFunction
+
+public enum AggregateFunction {
+    
+    // MARK: Public
+    
+    case Average(AttributeName)
+    case Sum(AttributeName)
+    case Count(AttributeName)
+    case Minimum(AttributeName)
+    case Maximum(AttributeName)
+    case Medium(AttributeName)
+    case Mode(AttributeName)
+    case StandardDeviation(AttributeName)
+    
+    
+    // MARK: Internal
+    
+    internal func toExpression() -> NSExpression {
+        
+        switch self {
+            
+        case .Average(let attributeName):
+            return NSExpression(
+                forFunction: "average:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Sum(let attributeName):
+            return NSExpression(
+                forFunction: "sum:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Count(let attributeName):
+            return NSExpression(
+                forFunction: "count:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Minimum(let attributeName):
+            return NSExpression(
+                forFunction: "min:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Maximum(let attributeName):
+            return NSExpression(
+                forFunction: "max:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Medium(let attributeName):
+            return NSExpression(
+                forFunction: "medium:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .Mode(let attributeName):
+            return NSExpression(
+                forFunction: "mode:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+            
+        case .StandardDeviation(let attributeName):
+            return NSExpression(
+                forFunction: "stddev:",
+                arguments: [NSExpression(forKeyPath: "\(attributeName)")]
+            )
+        }
+    }
+}