108 lines
3.6 KiB
C#
108 lines
3.6 KiB
C#
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// CommonExtensions.cs
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//
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// Author:
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// MiNG <developer@ming.gz.cn>
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//
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// Copyright (c) 2018 Alibaba Cloud
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Linq;
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namespace Aliyun.Api.LogService.Utils
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{
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internal static class CommonExtensions
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{
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internal static Boolean IsEmpty(this String source)
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{
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return String.IsNullOrEmpty(source);
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}
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internal static Boolean IsNotEmpty(this String source)
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{
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return !String.IsNullOrEmpty(source);
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}
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internal static Boolean IsEmpty<T>(this T[] source)
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{
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return source == null || source.Length == 0;
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}
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internal static Boolean IsNotEmpty<T>(this T[] source)
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{
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return source != null && source.Length != 0;
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}
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internal static Boolean IsEmpty<T>(this IEnumerable<T> source)
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{
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return source == null || !source.Any();
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}
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internal static Boolean IsNotEmpty<T>(this IEnumerable<T> source)
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{
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return source != null && source.Any();
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}
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internal static IEnumerable<KeyValuePair<String, String>> ToEnumerable(this NameValueCollection source)
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{
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return source.AllKeys
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.SelectMany(key => source.GetValues(key), (key, value) => new KeyValuePair<String, String>(key, value));
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}
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/// <summary>
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/// Freeze the IEnumerable to avoid re-evaluating on <paramref name="source"/>.
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/// </summary>
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/// <param name="source">The source to freeze.</param>
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/// <typeparam name="T">The item type in source.</typeparam>
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/// <returns>If source has already frozen, return itself; otherwize <see cref="Enumerable.ToArray{TSource}"/> will be applied.</returns>
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internal static IEnumerable<T> Freeze<T>(this IEnumerable<T> source)
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{
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switch (source)
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{
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case null:
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case Array _:
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case ICollection<T> _:
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case IReadOnlyCollection<T> _:
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{
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return source;
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}
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default:
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{
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return source.ToArray();
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}
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}
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}
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internal static TValue GetValueOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> source, TKey key)
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{
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if (source == null)
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{
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return default;
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}
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return source.TryGetValue(key, out var value) ? value : default;
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}
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}
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}
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