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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 DictionaryExtensions
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{
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#if !NETCOREAPP
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public static TValue GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dictionary, TKey key, TValue defaultValue = default(TValue))
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{
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TValue value;
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return dictionary.TryGetValue(key, out value) ? value : defaultValue;
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}
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#endif
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public static Dictionary<T1, T2> Merge<T1, T2>(this Dictionary<T1, T2> first, Dictionary<T1, T2> second)
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{
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if (first == null) throw new ArgumentNullException("first");
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if (second == null) throw new ArgumentNullException("second");
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var merged = new Dictionary<T1, T2>();
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first.ToList().ForEach(kv => merged[kv.Key] = kv.Value);
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second.ToList().ForEach(kv => merged[kv.Key] = kv.Value);
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return merged;
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}
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public static void Add<TKey, TValue>(this ICollection<KeyValuePair<TKey, TValue>> collection, TKey key, TValue value)
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{
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collection.Add(new KeyValuePair<TKey, TValue>(key, value));
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}
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public static IDictionary<TNewKey, TNewValue> SelectDictionary<TKey, TValue, TNewKey, TNewValue>(this IDictionary<TKey, TValue> dictionary,
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Func<KeyValuePair<TKey, TValue>, ValueTuple<TNewKey, TNewValue>> selection)
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{
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return dictionary.Select(selection).ToDictionary(t => t.Item1, t => t.Item2);
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}
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public static IDictionary<TNewKey, TNewValue> SelectDictionary<TKey, TValue, TNewKey, TNewValue>(
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this IDictionary<TKey, TValue> dictionary,
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Func<KeyValuePair<TKey, TValue>, TNewKey> keySelector,
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Func<KeyValuePair<TKey, TValue>, TNewValue> valueSelector)
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{
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return dictionary.SelectDictionary(p => { return (keySelector(p), valueSelector(p)); });
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}
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}
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}
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