class/System.ComponentModel.Composition/src/ComponentModel/Microsoft/Internal/Assumes.cs

   1 // -----------------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // -----------------------------------------------------------------------
   4 using System;
   5 using System.ComponentModel;
   6 using System.Diagnostics;
   7 using System.Diagnostics.CodeAnalysis;
   8 using System.Globalization;
   9 using System.Runtime.Serialization;
  10
  11 namespace Microsoft.Internal
  12 {
  13     internal static partial class Assumes
  14     {
  15         [DebuggerStepThrough]
  16         internal static void NotNull<T>(T value)
  17             where T : class
  18         {
  19             IsTrue(value != null);
  20         }
  21
  22         [DebuggerStepThrough]
  23         internal static void NotNull<T1, T2>(T1 value1, T2 value2)
  24             where T1 : class
  25             where T2 : class
  26         {
  27             NotNull(value1);
  28             NotNull(value2);
  29         }
  30
  31         [DebuggerStepThrough]
  32         internal static void NotNull<T1, T2, T3>(T1 value1, T2 value2, T3 value3)
  33             where T1 : class
  34             where T2 : class
  35             where T3 : class
  36         {
  37             NotNull(value1);
  38             NotNull(value2);
  39             NotNull(value3);
  40         }
  41
  42         [DebuggerStepThrough]
  43         internal static void NotNullOrEmpty<T>(T[] values)
  44         {
  45             Assumes.NotNull(values);
  46             Assumes.IsTrue(values.Length > 0);
  47         }
  48
  49         [DebuggerStepThrough]
  50         internal static void NotNullOrEmpty(string value)
  51         {
  52             NotNull(value);
  53             IsTrue(value.Length > 0);
  54         }
  55
  56         [DebuggerStepThrough]
  57         internal static void Null<T>(T value)
  58             where T : class
  59         {
  60             IsTrue(value == null);
  61         }
  62
  63         [DebuggerStepThrough]
  64         internal static void IsFalse(bool condition)
  65         {
  66             if (condition)
  67             {
  68                 Fail(null);
  69             }
  70         }
  71
  72         [DebuggerStepThrough]
  73         internal static void IsTrue(bool condition)
  74         {
  75             if (!condition)
  76             {
  77                 Fail(null);
  78             }
  79         }
  80
  81         [DebuggerStepThrough]
  82         internal static void IsTrue(bool condition, [Localizable(false)]string message)
  83         {
  84             if (!condition)
  85             {
  86                 Fail(message);
  87             }
  88         }
  89
  90         [DebuggerStepThrough]
  91         internal static void Fail([Localizable(false)]string message)
  92         {
  93             throw new InternalErrorException(message);
  94         }
  95
  96         [DebuggerStepThrough]
  97         internal static T NotReachable<T>()
  98         {
  99             throw new InternalErrorException("Code path should never be reached!");
 100         }
 101     }
 102 }