1 files changed, 167 insertions, 0 deletions
diff --git a/mcs/class/corlib/System.IO/CheckArgument.cs b/mcs/class/corlib/System.IO/CheckArgument.cs
new file mode 100644
index 00000000000..eaf20c0002e
--- /dev/null
+++ b/mcs/class/corlib/System.IO/CheckArgument.cs
@@ -0,0 +1,167 @@
+//------------------------------------------------------------------------------
+// 
+// System.IO.CheckArgument.cs 
+//
+// Copyright (C) 2001 Moonlight Enterprises, All Rights Reserved
+// 
+// Author:         Jim Richardson, develop@wtfo-guru.com
+// Created:        Saturday, August 25, 2001 
+//
+// NOTE: All contributors can freely add to this class or make modifications
+//       that do not break existing usage of methods 
+//------------------------------------------------------------------------------
+
+
+using System;
+using System.IO;
+
+namespace System.IO
+{
+	/// <summary>
+	/// A utility class to assist with various argument validations in System.IO
+	/// </summary>
+	internal sealed class CheckArgument
+	{
+		/// <summary>
+		/// Generates and exception if arg contains whitepace only
+		/// </summary>
+		public static void WhitespaceOnly (string arg, string desc)
+		{
+			if (arg != null && arg.Length > 0)
+			{
+				string temp = arg;
+				temp.Trim ();
+				if (temp.Length == 0)
+				{
+					throw new ArgumentException (desc);
+				}
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if arg contains whitepace only
+		/// </summary>
+		public static void WhitespaceOnly (string arg)
+		{
+			WhitespaceOnly (arg, "Argument string consists of whitespace characters only.");
+		}
+		
+		/// <summary>
+		/// Generates and exception if arg is empty
+		/// </summary>
+		public static void Empty (string arg, string desc)
+		{
+			if (arg != null && arg.Length == 0)
+			{
+				throw new ArgumentException (desc);
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if arg is empty
+		/// </summary>
+		public static void Empty (string arg)
+		{
+			Empty (arg, "Argument string is empty.");
+		}
+		
+		/// <summary>
+		/// Generates and exception if arg is null
+		/// </summary>
+		public static void Null (Object arg, string desc)
+		{
+			if (arg == null)
+			{
+				throw new ArgumentNullException (desc);
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if arg is null
+		/// </summary>
+		public static void Null (Object arg)
+		{
+			if (arg == null)
+			{
+				throw new ArgumentNullException ();
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if path contains invalid path characters
+		/// </summary>
+		public static void PathChars (string path, string desc)
+		{
+			if (path != null)
+			{
+				if (path.IndexOfAny (System.IO.Path.InvalidPathChars) > -1)
+				{
+					throw new ArgumentException (desc);
+				}
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if path contains invalid path characters
+		/// </summary>
+		public static void PathChars (string path)
+		{
+			PathChars (path, "Path contains invalid characters");
+		}
+		
+		/// <summary>
+		/// Generates and exception if path too long
+		/// </summary>
+		[MonoTODO]
+		public static void PathLength (string path, string desc)
+		{
+		 	//TODO: find out how long is too long
+		}
+		
+		/// <summary>
+		/// Generates and exception if path too long
+		/// </summary>
+		public static void PathLength (string path)
+		{
+			PathLength (path);
+		}
+		
+		/// <summary>
+		/// Generates and exception if path is illegal
+		/// </summary>
+		public static void Path (string path, bool bAllowNull, bool bLength)
+		{
+			if (path != null) //allow null
+			{
+				Empty (path, "Path cannot be the empty string");	// path can't be empty
+				WhitespaceOnly (path, "Path cannot be all whitespace");	// path can't be all whitespace
+				PathChars (path);	// path can't contain invalid characters
+				if (bLength)
+				{
+					PathLength ("Path too long");
+				}
+			}
+			else if (!bAllowNull)
+			{
+				throw new ArgumentNullException ("Parameter name: path");
+			}
+		}
+		
+		/// <summary>
+		/// Generates and exception if path is illegal
+		/// </summary>
+		public static void Path (string path, bool bAllowNull)
+		{
+			Path (path, bAllowNull, false);
+		}
+		
+		/// <summary>
+		/// Generates and exception if path is illegal
+		/// </summary>
+		public static void Path (string path)
+		{
+			Path (path, false, false);
+		}
+
+	}
+}	// namespace System.IO.Private