/// <summary>
/// 获取数组
/// </summary>
/// <param name="array"></param>
internal void GetDescArraySkip(ref PageArray <valueType> array)
{
if (Left != null)
{
int count = Left.Count;
if (count > array.SkipCount)
{
Left.GetDescArraySkip(ref array);
if (array.Index != 0 && array.AddDesc(Value) != 0)
{
Right.getDescArray(ref array);
}
return;
}
array.SkipCount -= count;
}
if (array.SkipCount == 0)
{
if (array.AddDesc(Value) != 0)
{
Right.getDescArray(ref array);
}
return;
}
--array.SkipCount;
Right.GetDescArraySkip(ref array);
}
/// <summary>
/// 获取数组
/// </summary>
/// <typeparam name="arrayType"></typeparam>
/// <param name="array"></param>
internal void GetArraySkip <arrayType>(ref PageArray <valueType, arrayType> array)
{
if (Left != null)
{
int count = Left.Count;
if (count > array.SkipCount)
{
Left.GetArraySkip(ref array);
if (!array.IsArray && !array.Add(Value))
{
Right.getArray(ref array);
}
return;
}
array.SkipCount -= count;
}
if (array.SkipCount == 0)
{
if (!array.Add(Value))
{
Right.getArray(ref array);
}
return;
}
--array.SkipCount;
Right.GetArraySkip(ref array);
}
/// <summary>
/// 获取范围数据集合
/// </summary>
/// <param name="skipCount">跳过记录数</param>
/// <param name="getCount">获取记录数</param>
/// <returns>数据集合</returns>
internal valueType[] GetRange(int skipCount, int getCount)
{
if (Boot != null && skipCount < Boot.Count)
{
PageArray <valueType> array = new PageArray <valueType> {
Array = new valueType[Math.Min(Boot.Count - skipCount, getCount)], SkipCount = skipCount
};
Boot.GetArraySkip(ref array);
return(array.Array);
}
return(NullValue <valueType> .Array);
}
/// <summary>
/// 获取逆序范围数据集合
/// </summary>
/// <param name="skipCount">跳过记录数</param>
/// <param name="getCount">获取记录数</param>
/// <returns>数据集合</returns>
internal valueType[] GetRangeDesc(int skipCount, int getCount)
{
if (Boot != null && skipCount < Boot.Count)
{
getCount = Math.Min(Boot.Count - skipCount, getCount);
PageArray <valueType> array = new PageArray <valueType> {
Array = new valueType[getCount], SkipCount = Boot.Count - (skipCount + getCount), Index = getCount
};
Boot.GetDescArraySkip(ref array);
return(array.Array);
}
return(NullValue <valueType> .Array);
}
/// <summary>
/// 获取数组
/// </summary>
/// <param name="array"></param>
private void getDescArray(ref PageArray <valueType> array)
{
if (Left != null)
{
Left.getDescArray(ref array);
if (array.Index == 0)
{
return;
}
}
if (array.AddDesc(Value) != 0)
{
Right.getDescArray(ref array);
}
}
/// <summary>
/// 获取数组
/// </summary>
/// <typeparam name="arrayType"></typeparam>
/// <param name="array"></param>
private void getArray <arrayType>(ref PageArray <valueType, arrayType> array)
{
if (Left != null)
{
Left.getArray(ref array);
if (array.IsArray)
{
return;
}
}
if (!array.Add(Value))
{
Right.getArray(ref array);
}
}
/// <summary>
/// 获取分页数据
/// </summary>
/// <param name="pageSize">分页大小</param>
/// <param name="page">分页号,从 1 开始</param>
/// <param name="getValue">获取数据委托</param>
/// <returns>分页数据</returns>
internal arrayType[] GetPage <arrayType>(int pageSize, int page, Func <valueType, arrayType> getValue)
{
if (Boot != null)
{
int count = Boot.Count, skipCount = pageSize * (page - 1);
if (skipCount < count)
{
PageArray <valueType, arrayType> array = new PageArray <valueType, arrayType> {
Array = new arrayType[Math.Min(count - skipCount, pageSize)], SkipCount = skipCount, GetValue = getValue
};
Boot.GetArraySkip(ref array);
return(array.Array);
}
}
return(NullValue <arrayType> .Array);
}
/// <summary>
/// 获取分页数据
/// </summary>
/// <param name="pageSize">分页大小</param>
/// <param name="page">分页号,从 1 开始</param>
/// <returns>分页数据</returns>
internal valueType[] GetPage(int pageSize, int page)
{
if (Boot != null)
{
int count = Boot.Count, skipCount = pageSize * (page - 1);
if (skipCount < count)
{
PageArray <valueType> array = new PageArray <valueType> {
Array = new valueType[Math.Min(count - skipCount, pageSize)], SkipCount = skipCount
};
Boot.GetArraySkip(ref array);
return(array.Array);
}
}
return(EmptyArray <valueType> .Array);
}
/// <summary>
/// 获取逆序分页数据
/// </summary>
/// <param name="pageSize">分页大小</param>
/// <param name="page">分页号,从 1 开始</param>
/// <returns>分页数据</returns>
internal valueType[] GetPageDesc(int pageSize, int page)
{
if (Boot != null)
{
int count = Boot.Count, skipCount = pageSize * (page - 1);
if (skipCount < count)
{
pageSize = Math.Min(count - skipCount, pageSize);
PageArray <valueType> array = new PageArray <valueType> {
Array = new valueType[pageSize], SkipCount = count - (skipCount + pageSize), Index = pageSize
};
Boot.GetDescArraySkip(ref array);
return(array.Array);
}
}
return(NullValue <valueType> .Array);
}
