//Copyright (c) Service Stack LLC. All Rights Reserved.

//License: https://raw.github.com/ServiceStack/ServiceStack/master/license.txt

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using ServiceStack.Text.Common;

namespace ServiceStack

{

public static class ListExtensions

{

public static string Join<T>(this IEnumerable<T> values)

{

return Join(values, JsWriter.ItemSeperatorString);

}

public static string Join<T>(this IEnumerable<T> values, string seperator)

{

var sb = new StringBuilder();

foreach (var value in values)

{

if (sb.Length > 0)

sb.Append(seperator);

sb.Append(value);

}

return sb.ToString();

}

public static bool IsNullOrEmpty<T>(this List<T> list)

{

return list == null || list.Count == 0;

}

//TODO: make it work

public static IEnumerable<TFrom> SafeWhere<TFrom>(this List<TFrom> list, Func<TFrom, bool> predicate)

{

return list.Where(predicate);

}

public static int NullableCount<T>(this List<T> list)

{

return list == null ? 0 : list.Count;

}

public static void AddIfNotExists<T>(this List<T> list, T item)

{

if (!list.Contains(item))

list.Add(item);

}

public static T[] NewArray<T>(this T[] array, T with = null, T without = null) where T : class

{

var to = new List<T>(array);

if (with != null)

to.Add(with);

if (without != null)

to.Remove(without);

return to.ToArray();

}

public static List<T> InList<T>(this T value)

{

return new List<T> { value };

}

public static T[] InArray<T>(this T value)

{

return new[] { value };

}

}

}