Parser Schemas– Easy and Powerful parsing of XML-based languages

/***********************************************************************\
 * Comnicate.CodeDom.Xml.ParserSchemas                                 *
 * Parses xml-based languages according to a user defined schema.      *
 * Copyright � 2005 Tomas Deml (as Comnicate!)                         *
 *                  tomasdeml@msn.com                                  *
 *                                                                     *
 * This library is free software; you can redistribute it and/or       *
 * modify it under the terms of the GNU Lesser General Public          *
 * License as published by the Free Software Foundation; either        *
 * version 2.1 of the License, or (at your option) any later version.  *
 *                                                                     *
 * This library is distributed in the hope that it will be useful,     *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of      *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   *
 * Lesser General Public License for more details.                     *
\***********************************************************************/

using System;
using System.Collections.Generic;
using System.Text;
using Comnicate.CodeDom.Xml.ParserSchemas.Rules.Evaluated;

namespace Comnicate.CodeDom.Xml.ParserSchemas.Rules.Evaluation.PrimitiveValueValidators
{
    /// <summary>
    /// Transforms enum values.
    /// </summary>
    public sealed class EnumValueTransformer<T> : INodeTransformer<T> where T : struct
    {
        #region Fields

        private Type EnumType;

        #endregion

        #region .ctors, properties & methods

        /// <summary>
        /// Initializes a new instance of the <see cref="EnumValueTransformer&lt;T&gt;"/> class.
        /// </summary>
        public EnumValueTransformer()
        {
            this.EnumType = typeof(T);
        }

        #endregion

        #region INodeTransformer<T> Members

        /// <summary>
        /// Transform the value into the specified enum.
        /// </summary>
        /// <param name="evaluatedNodeRule">Node to transform.</param>
        /// <returns>Transformed enum value.</returns>
        public T Transform(EvaluatedRule evaluatedNodeRule)
        {
            // Did we get the value
            if (evaluatedNodeRule.Value == null) 
                throw new InvalidOperationException(String.Format(Resources.ExceptionMsg_Formatable1_NoValueSupplied, evaluatedNodeRule));

            // Return eventData
            return (T)Enum.Parse(this.EnumType, evaluatedNodeRule.Value, true);
        }

        #endregion
    }
}