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152 行
4.3 KiB

using System;
using System.Collections.Generic;
using System.Linq;
using Unity.UIWidgets.external;
using Unity.UIWidgets.InternalBridge;
namespace Unity.UIWidgets.foundation {
public static class CollectionUtils {
public static V putIfAbsent<K, V>(this IDictionary<K, V> it, K key, Func<V> ifAbsent) {
V value;
if (it.TryGetValue(key, out value)) {
return value;
}
value = ifAbsent();
it[key] = value;
return value;
}
public static bool isEmpty<T>(this ICollection<T> it) {
return it.Count == 0;
}
public static bool isNotEmpty<T>(this ICollection<T> it) {
return it.Count != 0;
}
public static bool isEmpty<T>(this Queue<T> it) {
return it.Count == 0;
}
public static bool isNotEmpty<T>(this Queue<T> it) {
return it.Count != 0;
}
public static bool isEmpty<TKey, TValue>(this IDictionary<TKey, TValue> it) {
return it.Count == 0;
}
public static bool isNotEmpty<TKey, TValue>(this IDictionary<TKey, TValue> it) {
return it.Count != 0;
}
public static bool isEmpty(this string it) {
return string.IsNullOrEmpty(it);
}
public static bool isNotEmpty(this string it) {
return !string.IsNullOrEmpty(it);
}
public static TValue getOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> it, TKey key) {
TValue v;
it.TryGetValue(key, out v);
return v;
}
public static TValue getOrDefault<TKey, TValue>(
this IDictionary<TKey, TValue> it, TKey key, TValue defaultVal) {
TValue v = defaultVal;
if (key == null) {
return v;
}
it.TryGetValue(key, out v);
return v;
}
public static T first<T>(this IList<T> it) {
return it[0];
}
public static T last<T>(this IList<T> it) {
return it[it.Count - 1];
}
public static T removeLast<T>(this IList<T> it) {
var lastIndex = it.Count - 1;
var result = it[lastIndex];
it.RemoveAt(lastIndex);
return result;
}
public static int hashList<T>(this IList<T> it) {
unchecked {
var hashCode = 0;
if (it != null) {
foreach (var item in it) {
hashCode = (hashCode * 397) ^ item.GetHashCode();
}
}
return hashCode;
}
}
public static bool equalsList<T>(this IList<T> it, IList<T> list) {
if (it == null && list == null) {
return true;
}
if (ReferenceEquals(it, list)) {
return true;
}
if (it == null || list == null) {
return false;
}
if (it.Count != list.Count) {
return false;
}
for (int i = it.Count - 1; i >= 0; --i) {
if (!Equals(it[i], list[i])) {
return false;
}
}
return true;
}
public static string toStringList<T>(this IList<T> it) {
if (it == null) {
return null;
}
return "{ " + string.Join(", ", LinqUtils<string,T>.SelectList(it,(item => item.ToString()))) + " }";
}
public static void reset<T>(this List<T> list, int size) {
NoAllocHelpersBridge<T>.EnsureListElemCount(list, size);
}
public static ref T refAt<T>(this List<T> list, int index) {
var array = NoAllocHelpersBridge<T>.ExtractArrayFromListT(list);
return ref array[index];
}
public static T[] array<T>(this List<T> list) {
return NoAllocHelpersBridge<T>.ExtractArrayFromListT(list);
}
public static List<T> CreateRepeatedList<T>(T value, int length) {
List<T> newList = new List<T>(length);
for (int i = 0; i < length; i++) {
newList.Add(value);
}
return newList;
}
}
}