#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you 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.
//
#endregion

using System;
using System.Text;

namespace log4net.Util.TypeConverters
{
  /// <summary>
  /// Supports conversion from string to <see cref="Encoding"/> type.
  /// </summary>
  /// <remarks>
  /// <para>
  /// Supports conversion from string to <see cref="Encoding"/> type.
  /// </para>
  /// </remarks>
  /// <seealso cref="ConverterRegistry"/>
  /// <seealso cref="IConvertFrom"/>
  /// <seealso cref="IConvertTo"/>
  /// <author>Nicko Cadell</author>
  /// <author>Gert Driesen</author>
  internal class EncodingConverter : IConvertFrom 
  {
    #region Implementation of IConvertFrom

    /// <summary>
    /// Can the source type be converted to the type supported by this object
    /// </summary>
    /// <param name="sourceType">the type to convert</param>
    /// <returns>true if the conversion is possible</returns>
    /// <remarks>
    /// <para>
    /// Returns <c>true</c> if the <paramref name="sourceType"/> is
    /// the <see cref="String"/> type.
    /// </para>
    /// </remarks>
    public bool CanConvertFrom(Type sourceType) 
    {
      return (sourceType == typeof(string));
    }

    /// <summary>
    /// Overrides the ConvertFrom method of IConvertFrom.
    /// </summary>
    /// <param name="source">the object to convert to an encoding</param>
    /// <returns>the encoding</returns>
    /// <remarks>
    /// <para>
    /// Uses the <see cref="M:Encoding.GetEncoding(string)"/> method to 
    /// convert the <see cref="String"/> argument to an <see cref="Encoding"/>.
    /// </para>
    /// </remarks>
    /// <exception cref="ConversionNotSupportedException">
    /// The <paramref name="source"/> object cannot be converted to the
    /// target type. To check for this condition use the <see cref="CanConvertFrom"/>
    /// method.
    /// </exception>
    public object ConvertFrom(object source) 
    {
      string str = source as string;
      if (str != null) 
      {
        return Encoding.GetEncoding(str);
      }
      throw ConversionNotSupportedException.Create(typeof(Encoding), source);
    }

    #endregion
  }
}