Add ComparisonQueryOperator

Author: colemancda

Sources/MongoDBModel/ComparisonQueryOperator.swift

@@ -0,0 +1,67 @@
+//
+//  ComparisonQueryOperator.swift
+//  
+//
+//  Created by Alsey Coleman Miller on 8/21/23.
+//
+
+import Foundation
+import Predicate
+
+/// Comparison Query Operators
+///
+/// Comparison operators return data based on value comparisons.
+///
+/// [Documentation](https://www.mongodb.com/docs/v7.0/reference/operator/query-comparison/)
+public enum ComparisonQueryOperator: String, Codable, CaseIterable {
+    
+    /// Matches values that are equal to a specified value.
+    case equalTo                    = "$eq"
+    
+    /// Matches all values that are not equal to a specified value.
+    case notEqualTo                 = "$ne"
+    
+    /// Matches values that are greater than a specified value.
+    case greaterThan                = "$gt"
+    
+    /// Matches values that are greater than or equal to a specified value.
+    case greaterThanOrEqualTo       = "$gte"
+    
+    /// Matches values that are less than a specified value.
+    case lessThan                   = "$lt"
+    
+    /// Matches values that are less than or equal to a specified value.
+    case lessThanOrEqualTo          = "$lte"
+    
+    /// Matches any of the values specified in an array.
+    case `in`                       = "$in"
+    
+    /// Matches none of the values specified in an array.
+    case notIn                      = "$nin"
+}
+
+// MARK: - Predicate
+
+public extension ComparisonQueryOperator {
+    
+    init?(predicate: Comparison.Operator) {
+        switch predicate {
+        case .equalTo:
+            self = .equalTo
+        case .greaterThan:
+            self = .greaterThan
+        case .greaterThanOrEqualTo:
+            self = .greaterThanOrEqualTo
+        case .in:
+            self = .in
+        case .lessThan:
+            self = .lessThan
+        case .lessThanOrEqualTo:
+            self = .lessThanOrEqualTo
+        case .notEqualTo:
+            self = .notEqualTo
+        default:
+            return nil
+        }
+    }
+}