Web/UrlSeoUtils.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.Collections.Generic;
using System.Text;
using System.Web;
using System.Text.RegularExpressions;


namespace ComLib.Web
{
    /// <summary>
    /// Url optimizer utility class.
    /// </summary>
    public class UrlSeoUtils
    {
        /// <summary>
        /// Map of invalid characters that should not appear in 
        /// an SEO optimized url.
        /// </summary>
        private static IDictionary<char, bool> _invalidChars;


        /// <summary>
        /// String containing each invalid character.
        /// </summary>
        public const string InvalidSeoUrlChars = @"$%#@!*?;:~`_+=()[]{}|\'<>,/^&"".";


        /// <summary>
        /// Initialize the list of mappings.
        /// </summary>
        static UrlSeoUtils()
        {
            char[] invalidChars = InvalidSeoUrlChars.ToCharArray();
            _invalidChars = new Dictionary<char, bool>();

            // Store each invalid char.
            foreach (char invalidChar in invalidChars)
            {
                _invalidChars.Add(invalidChar, true);
            }
        }


        /// <summary>
        /// Same as BuildValidUrl but uses RegEx and is much, much slower.
        /// </summary>