ContractUtils.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Utils / ContractUtils.cs / 1305376 / ContractUtils.cs
                        

                        
                            /* **************************************************************************** 
 *
 * Copyright (c) Microsoft Corporation.
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 * 
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/ 

using System.Collections.Generic; 
using System.Diagnostics; 
using System.Linq.Expressions;
 
#if SILVERLIGHT
using System.Core;
#endif
 
namespace System.Dynamic.Utils {
 
    // Will be replaced with CLRv4 managed contracts 
    internal static class ContractUtils {
 
        internal static Exception Unreachable {
            get {
                Debug.Assert(false, "Unreachable");
                return new InvalidOperationException("Code supposed to be unreachable"); 
            }
        } 
 
        internal static void Requires(bool precondition) {
            if (!precondition) { 
                throw new ArgumentException(Strings.MethodPreconditionViolated);
            }
        }
 
        internal static void Requires(bool precondition, string paramName) {
            Debug.Assert(!string.IsNullOrEmpty(paramName)); 
 
            if (!precondition) {
                throw new ArgumentException(Strings.InvalidArgumentValue, paramName); 
            }
        }

        internal static void RequiresNotNull(object value, string paramName) { 
            Debug.Assert(!string.IsNullOrEmpty(paramName));
 
            if (value == null) { 
                throw new ArgumentNullException(paramName);
            } 
        }

        internal static void RequiresNotEmpty(ICollection collection, string paramName) {
            RequiresNotNull(collection, paramName); 
            if (collection.Count == 0) {
                throw new ArgumentException(Strings.NonEmptyCollectionRequired, paramName); 
            } 
        }
 
        /// 
        /// Requires the range [offset, offset + count] to be a subset of [0, array.Count].
        /// 
        /// Array is null. 
        /// Offset or count are out of range.
        internal static void RequiresArrayRange(IList array, int offset, int count, string offsetName, string countName) { 
            Debug.Assert(!string.IsNullOrEmpty(offsetName)); 
            Debug.Assert(!string.IsNullOrEmpty(countName));
            Debug.Assert(array != null); 

            if (count < 0) throw new ArgumentOutOfRangeException(countName);
            if (offset < 0 || array.Count - offset < count) throw new ArgumentOutOfRangeException(offsetName);
        } 

        ///  
        /// Requires the array and all its items to be non-null. 
        /// 
        internal static void RequiresNotNullItems(IList array, string arrayName) { 
            Debug.Assert(arrayName != null);
            RequiresNotNull(array, arrayName);

            for (int i = 0; i < array.Count; i++) { 
                if (array[i] == null) {
                    throw new ArgumentNullException(string.Format(System.Globalization.CultureInfo.CurrentCulture, "{0}[{1}]", arrayName, i)); 
                } 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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