netDxf/Collections/AttributeDictionary.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.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.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System;
using System.Collections;
using System.Collections.Generic;
using Attribute = netDxf.Entities.Attribute;

namespace netDxf.Collections
{
    /// <summary>
    /// Represents a collection of <see cref="Attribute">Attributes</see>.
    /// </summary>
    public class AttributeDictionary :
        IDictionary<string, Attribute>
    {
        #region private fields

        private readonly Dictionary<string, Attribute> innerDictionary;

        #endregion

        #region constructor

        /// <summary>
        /// Initializes a new instance of <c>AttributeDictionary</c>.
        /// </summary>
        public AttributeDictionary()
        {
            this.innerDictionary = new Dictionary<string, Attribute>(StringComparer.OrdinalIgnoreCase);
        }

        /// <summary>
        /// Initializes a new instance of <c>AttributeDictionary</c> with the specified collection of attributes.
        /// </summary>
        /// <param name="attributes">The collection of attributes from which build the dictionary.</param>
        public AttributeDictionary(ICollection attributes)
        {
            if (attributes == null)
                throw new ArgumentNullException("attributes");