Pomelo.EntityFrameworkCore.MySql/src/Shared/Check.cs at a7f2543d0bb8e03b105535d8b3b3aa2220d8bf62 · PomeloFoundation/Pomelo.EntityFrameworkCore.MySql · GitHub

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// Copyright (c) Pomelo Foundation. All rights reserved.
// Licensed under the MIT. See LICENSE in the project root for license information.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using JetBrains.Annotations;
using Microsoft.EntityFrameworkCore.Diagnostics;
using CA = System.Diagnostics.CodeAnalysis;

namespace Microsoft.EntityFrameworkCore.Utilities
{
    [DebuggerStepThrough]
    internal static class Check
    {
        [ContractAnnotation("value:null => halt")]
        public static T NotNull<T>([NoEnumeration] T value, [InvokerParameterName] [NotNull] string parameterName)
        {
#pragma warning disable IDE0041 // Use 'is null' check
            if (ReferenceEquals(value, null))
#pragma warning restore IDE0041 // Use 'is null' check
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw new ArgumentNullException(parameterName);
            }

            return value;
        }

        [ContractAnnotation("value:null => halt")]
        public static IReadOnlyList<T> NotEmpty<T>(IReadOnlyList<T> value, [InvokerParameterName] [NotNull] string parameterName)
        {
            NotNull(value, parameterName);

            if (value.Count == 0)
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw new ArgumentException(AbstractionsStrings.CollectionArgumentIsEmpty);
            }

            return value;
        }

        [ContractAnnotation("value:null => halt")]
        public static string NotEmpty(string value, [InvokerParameterName] [NotNull] string parameterName)
        {
            Exception e = null;
            if (value is null)
            {
                e = new ArgumentNullException(parameterName);
            }
            else if (value.Trim().Length == 0)
            {
                e = new ArgumentException(AbstractionsStrings.ArgumentIsEmpty);
            }

            if (e != null)
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw e;
            }

            return value;
        }

        public static string NullButNotEmpty(string value, [InvokerParameterName] [NotNull] string parameterName)
        {
            if (!(value is null)
                && value.Length == 0)
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw new ArgumentException(AbstractionsStrings.ArgumentIsEmpty);
            }

            return value;
        }

        public static IReadOnlyList<T> HasNoNulls<T>(IReadOnlyList<T> value, [InvokerParameterName] [NotNull] string parameterName)
            where T : class
        {
            NotNull(value, parameterName);

            if (value.Any(e => e == null))
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw new ArgumentException(parameterName);
            }

            return value;
        }

        public static IReadOnlyList<string> HasNoEmptyElements(
            IReadOnlyList<string> value,
            [InvokerParameterName] [NotNull] string parameterName)
        {
            NotNull(value, parameterName);

            if (value.Any(s => string.IsNullOrWhiteSpace(s)))
            {
                NotEmpty(parameterName, nameof(parameterName));

                throw new ArgumentException(AbstractionsStrings.CollectionArgumentHasEmptyElements);
            }

            return value;
        }

        public static TEnum? EnumValue<TEnum>(
            TEnum? value,
            [InvokerParameterName] [NotNull] string parameterName)
            where TEnum : struct
        {
            NotNull(value, parameterName);

            return NullOrEnumValue(value, parameterName);
        }

        public static TEnum? NullOrEnumValue<TEnum>(
            TEnum? value,
            [InvokerParameterName] [NotNull] string parameterName)
            where TEnum : struct
        {
            if (value is not null)
            {
                if (!Enum.IsDefined(typeof(TEnum), value))
                {
                    throw new ArgumentOutOfRangeException(parameterName, value, null);
                }
            }

            return value;
        }

        [Conditional("DEBUG")]
        public static void DebugAssert([CA.DoesNotReturnIfAttribute(false)] bool condition, string message)
        {
            if (!condition)
            {
                throw new Exception($"Check.DebugAssert failed: {message}");
            }
        }
    }
}