/source/library/Interlace/Binding/ViewConverters/DictionaryLookupConverter.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * 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.

//     * Neither the name of the Computer Consultancy Pty Ltd 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COMPUTER CONSULTANCY PTY LTD 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 

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// 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 Interlace.Binding.Views;



#endregion



namespace Interlace.Binding.ViewConverters

{

    public class LookupConverter<TModel, TView> : ViewConverterBase

    {

        Dictionary<TModel, TView> _dictionary;



        public LookupConverter(Dictionary<TModel, TView> lookup)

        {

            _dictionary = lookup;

        }



        public override object ModelToView(object obj)

        {

            if (!typeof(TModel).IsInstanceOfType(obj)) throw new InvalidOperationException(string.Format("Binder requires a model type of {0}, not {1}", typeof(TModel), obj.GetType()));



            TModel modelValue = (TModel)obj;

            

            if (!_dictionary.ContainsKey(modelValue)) throw new InvalidOperationException(string.Format("Key '{0}' not found in lookup", modelValue.ToString()));



            return _dictionary[modelValue];

        }



        public override object ViewToModel(object obj)

        {

            throw new NotImplementedException("Dictionary Converter does not handle writeable views");

        }

    }

}