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/*
* Copyright (c) 2008, Anthony James McCreath
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1 Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2 Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3 Neither the name of the project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Anthony James McCreath "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Anthony James McCreath BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Security;
namespace ClockWork.ScriptBuilder
{
/// <summary>
/// Supports formatting IScriptItems via their Render method and SecureString reading
/// Use the singleton Instance to save resources
/// </summary>
public class ScriptFormatProvider : IFormatProvider, ICustomFormatter
{
#region Singleton
private static ScriptFormatProvider _Instance = null;
/// <summary>
/// A reusable instance of the format provider
/// </summary>
public static ScriptFormatProvider Instance
{
get
{
if (_Instance == null)
_Instance = new ScriptFormatProvider();
return _Instance;
}
}
#endregion
#region ICustomFormatter Members
/// <summary>
/// If passed a IScriptItem it will use its Render, otherwise formats as normal
/// Also supports SecureString reading
/// </summary>
/// <param name="format"></param>
/// <param name="arg"></param>
/// <param name="formatProvider"></param>
/// <returns></returns>
public virtual string Format(string format, object arg, IFormatProvider formatProvider)
{
if (arg is IScriptItem)
{
// have to render it!
IScriptItem si = (IScriptItem)arg;
return si.Render(formatProvider);
}
if (arg is SecureString)
return Encryption.ReadSecureString((SecureString)arg);
if (arg is IFormattable)
return ((IFormattable)arg).ToString(format, formatProvider);
if (arg != null)
return arg.ToString();
return null;
}
#endregion
#region IFormatProvider Members
/// <summary>
/// Indicate this is a Custom Formatter
/// </summary>
/// <param name="formatType"></param>
/// <returns></returns>
object IFormatProvider.GetFormat(Type formatType)
{
if (formatType == typeof(ICustomFormatter))
return this;
else
return null;
}
#endregion
}
}
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