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namespace RedCell.Xml
{
    /// <summary>
    /// Extension methods to System.String to encode/decode XML entities.
    /// </summary>
    /// <author><see cref="http://two-red-cells.com">Red Cell Innovation Inc.</see></author>
    /// <license>
    /// Provided under the terms of the <see cref="http://www.codeproject.com/info/cpol10.aspx">Code Project Open License</see>.
    /// </license>
    public static class XmlEntityExtensions
    {
        #region Extension Methods
        /// <summary>
        /// Encodes the string with XML entities as required.
        /// </summary>
        /// <param name="value">The value.</param>
        /// <returns>The encoded string.</returns>
        public static string EncodeXmlEntities(this string value)
        {
            if (value == null) return null;
            return value
                .Replace("&", "&amp;")
                .Replace("<", "&lt;")
                .Replace(">", "&rt;")
                .Replace("'", "&apos;")
                .Replace("\"", "&quot;");
        }

        /// <summary>
        /// Decodes the string with XML entities as required.
        /// </summary>
        /// <param name="value">The value.</param>
        /// <returns>The decode string.</returns>
        public static string DecodeXmlEntities(this string value)
        {
            if (value == null) return null;
            return value
                .Replace("&amp;", "&")
                .Replace("&lt;", "<")
                .Replace("&rt;", ">")
                .Replace("&apos;", "'")
                .Replace("&quot;", "\"");
        }
        #endregion
    }
}