1 files changed, 114 insertions, 0 deletions
diff --git a/lib/VNLib.Plugins.Extensions.Loading/src/Configuration/Validate.cs b/lib/VNLib.Plugins.Extensions.Loading/src/Configuration/Validate.cs
new file mode 100644
index 0000000..1bb6787
--- /dev/null
+++ b/lib/VNLib.Plugins.Extensions.Loading/src/Configuration/Validate.cs
@@ -0,0 +1,114 @@
+/*
+* Copyright (c) 2024 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Plugins.Extensions.Loading
+* File: Validate.cs 
+*
+* Validate.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Plugins.Extensions.Loading is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Plugins.Extensions.Loading is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+
+using VNLib.Utils.IO;
+
+namespace VNLib.Plugins.Extensions.Loading.Configuration
+{
+    /// <summary>
+    /// A class that allows for easy configuration validation
+    /// </summary>
+    public sealed class Validate
+    {
+        /// <summary>
+        /// Ensures the object is not null and not an empty string,
+        /// otherwise a <see cref="ConfigurationValidationException"/> is raised
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="obj">The object to test</param>
+        /// <param name="message">The message to display to the user on loading</param>
+        /// <exception cref="ConfigurationValidationException"></exception>
+        [DoesNotReturn]
+        public static void NotNull<T>(T? obj, string message) where T : class
+        {
+            if (obj is null)
+            {
+                throw new ConfigurationValidationException(message);
+            }
+
+            if (obj is string s && string.IsNullOrWhiteSpace(s))
+            {
+                throw new ConfigurationValidationException(message);
+            }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="condition"></param>
+        /// <param name="message"></param>
+        /// <exception cref="ConfigurationValidationException"></exception>
+        public static void Assert([DoesNotReturnIf(false)] bool condition, string message)
+        {
+            if (!condition)
+            {
+                throw new ConfigurationValidationException(message);
+            }
+        }
+
+        public static void NotEqual<T>(T a, T b, string message)
+        {
+            if (a is null || b is null)
+            {
+                throw new ConfigurationValidationException(message);
+            }
+
+            if (a.Equals(b))
+            {
+                throw new ConfigurationValidationException(message);
+            }
+        }
+
+        public static void Range2<T>(T value, T min, T max, string message)
+             where T : IComparable<T>
+        {
+            //Compare the value against min/max calues and raise exception if it is
+            if (value.CompareTo(min) < 0 || value.CompareTo(max) > 0)
+            {
+                throw new ConfigurationValidationException(message);
+            }
+        }
+    
+
+        public static void Range<T>(T value, T min, T max, [CallerArgumentExpression(nameof(value))] string? paramName = null)
+            where T : IComparable<T>
+        {
+            
+            Range2(value, min, max, $"Value for {paramName} must be between {min} and {max}. Value: {value}");
+        }
+     
+
+        public static void FileExists(string path)
+        {
+            if (!FileOperations.FileExists(path))
+            {
+                throw new ConfigurationValidationException($"Required file: {path} not found");
+            }
+        }
+    }
+}