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GenericPage.cs
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/
GenericPage.cs
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// Copyright 2004-2010 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.Components.Pagination
{
using System;
using System.Collections;
using System.Collections.Generic;
/// <summary>
/// Represents the sliced data and offers a few read-only properties to create a pagination bar.
/// </summary>
[Serializable]
public class GenericPage<T> : AbstractPage<T>
{
private readonly int sliceStart, sliceEnd;
private readonly ICollection<T> sourceList;
/// <summary>
/// Initializes a new instance of the <see cref="GenericPage{T}"/> class.
/// </summary>
/// <param name="list">The list.</param>
/// <param name="curPage">The current page.</param>
/// <param name="pageSize">Size of the page.</param>
/// <exception cref="ArgumentOutOfRangeException">Thrown when <paramref name="pageSize"/> is less than 1.</exception>
public GenericPage(ICollection<T> list, int curPage, int pageSize)
{
if (pageSize <= 0) throw new ArgumentOutOfRangeException("pageSize", "pageSize cannot be less than 1.");
// Calculate slice indexes
int startIndex = sliceStart = (pageSize * curPage) - pageSize;
int endIndex = sliceEnd = Math.Min(startIndex + pageSize, list.Count);
sourceList = list;
CalculatePaginationInfo(startIndex, endIndex, list.Count, pageSize, curPage);
}
/// <summary>
/// Returns a enumerator for the contents of this page only (not the whole set).
/// </summary>
/// <returns>Enumerator instance</returns>
protected override IEnumerator<T> GetGenericEnumeratorImplementation()
{
if (sourceList is IList<T>)
{
IList<T> list = (IList<T>) sourceList;
for(int i = sliceStart; i < sliceEnd; i++)
{
yield return list[i];
}
}
else if (sourceList is IList)
{
IList list = (IList) sourceList;
for(int i = sliceStart; i < sliceEnd; i++)
{
yield return (T) list[i];
}
}
else
{
IEnumerator<T> en = sourceList.GetEnumerator();
for(int i = 0; i < sliceEnd; i++)
{
if (!en.MoveNext())
{
yield break;
}
if (i < sliceStart)
{
continue;
}
yield return en.Current;
}
}
}
protected override T GetGenericItemAtIndex(int itemIndex)
{
return new List<T>(sourceList)[itemIndex];
}
protected override object GetItemAtIndex(int itemIndex)
{
return GetGenericItemAtIndex(itemIndex);
}
}
}