// 自定义Linq相关代码
// 主要是一些CommonUseage代码
//
using System;
using System.Collections.Generic;

// 
// 
public static class LinqS
{
    public static List<string> ToStringList(string[] InStringArray )
    {
        if( InStringArray == null )
        {
            return null;
        }

        List<string> Items = new List<string>(InStringArray.Length);

        for( int i=0; i<InStringArray.Length; ++i )
        {
            Items.Add(InStringArray[i]);
        }

        return Items;
    }

    public static string[] Skip( string[] InStringArray, int InCount )
    {
        if (InStringArray == null)
        {
            return null;
        }

        int Remain = InStringArray.Length - InCount;

        string[] Results = new string[Remain];

        for( int i=InCount; i<InStringArray.Length; ++i )
        {
            Results[i - InCount] = InStringArray[i];
        }

        return Results;
    }

    public static string[] Take( string[] InStringArray, int InCount )
    {
        if (InStringArray == null)
        {
            return null;
        }

        string[] Results = new string[InCount];

        for( int i=0; i<InCount && i < InStringArray.Length; ++i )
        {
            Results[i] = InStringArray[i];
        }

        return Results;
    }

    public static string[] Where(string[] InStringArray, Func<string, bool> InPredicate )    
    {
        if (InStringArray == null)
        {
            return null;
        }

        List<string> Results = new List<string>(InStringArray.Length);

        for( int i=0; i<InStringArray.Length; ++i )
        {
            if( InPredicate(InStringArray[i]))
            {
                Results.Add(InStringArray[i]);
            }            
        }

        return Results.ToArray();
    }

    public static bool Contains<T>( T[] InArray, T InTest )
    {
        if( InArray == null || InArray.Length == 0 )
        {
            return false;
        }

        for( int i=0; i<InArray.Length; ++i )
        {
            if( Comparer<T>.Equals(InArray[i], InTest ) )
            {
                return true;
            }
        }

        return false;
    }

    public static T[] ToArray<T>( List<T> InList )
    {
        if( InList == null )
        {
            return null;
        }

        T[] Results = new T[InList.Count];

        for( int i=0; i<InList.Count; ++i )
        {
            Results[i] = InList[i];
        }

        return Results;
    }
}