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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, 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 Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if CLR2
using Microsoft.Scripting.Ast;
#else
using System.Linq.Expressions;
#endif
#if SILVERLIGHT
using System.Core;
#endif
using System.Collections.Generic;
using System.Diagnostics;
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<T>(ICollection<T> collection, string paramName) {
RequiresNotNull(collection, paramName);
if (collection.Count == 0) {
throw new ArgumentException(Strings.NonEmptyCollectionRequired, paramName);
}
}
/// <summary>
/// Requires the range [offset, offset + count] to be a subset of [0, array.Count].
/// </summary>
/// <exception cref="ArgumentNullException">Array is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException">Offset or count are out of range.</exception>
internal static void RequiresArrayRange<T>(IList<T> 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);
}
/// <summary>
/// Requires the array and all its items to be non-null.
/// </summary>
internal static void RequiresNotNullItems<T>(IList<T> 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));
}
}
}
}
}
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