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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace NzbDrone.Common.Extensions
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{
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public static class EnumerableExtensions
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{
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public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
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{
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var knownKeys = new HashSet<TKey>();
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return source.Where(element => knownKeys.Add(keySelector(element)));
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}
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public static void AddIfNotNull<TSource>(this List<TSource> source, TSource item)
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{
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if (item == null)
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{
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return;
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}
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source.Add(item);
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}
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public static bool Empty<TSource>(this IEnumerable<TSource> source)
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{
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return !source.Any();
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}
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public static bool None<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
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{
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return !source.Any(predicate);
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}
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public static bool NotAll<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
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{
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return !source.All(predicate);
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}
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public static List<TResult> SelectList<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> predicate)
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{
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return source.Select(predicate).ToList();
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}
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}
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}
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