Paging/PagerCalculator.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: 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.
 */
using System;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.Collections.Generic;



namespace ComLib.Paging
{

    /// <summary>
    /// Interface for any calculator to process the page action.
    /// </summary>
    public interface IPagerCalculator
    {
        /// <summary>
        /// Calculate pages
        /// </summary>
        /// <param name="pager">Instance of pager.</param>
        /// <param name="settings">Pager settings.</param>
        void Calculate(Pager pager, PagerSettings settings);
    }


    /// <summary>
    /// Default implementation of a pager.
    /// This uses a calculation scheme where the rules are the following :
    /// 
    /// 1. All possible links include ( first, previous, page1, page2, pageX, next, last )
    /// 2. The number of pages in the middle ( page1, page2 ) can be configured.
    /// 3. If current page = 1 ( links first and previous are not applicable )
    /// 4. If current page = last ( links last and next are not applicable )
    /// 5. The number of pages in the middle is cycled.
    /// </summary>
    public class PagerCalculator : IPagerCalculator
    {
        #region IPagerCalculator Members
        /// <summary>
        /// Calculate the pager properties such as starting, ending, next, previous pages.
        /// </summary>
        /// <param name="pagerData">Pager data.</param>
        /// <param name="pagerSettings">Pager settings.</param>
        public void Calculate(Pager pagerData, PagerSettings pagerSettings)
        {
            // Check bounds.