using System;
using System.Collections.Specialized;
using System.Configuration;

namespace BLToolkit.Configuration
{
    internal abstract class ElementBase : ConfigurationElement
    {
        protected ConfigurationPropertyCollection _properties = new ConfigurationPropertyCollection();

        protected override ConfigurationPropertyCollection Properties
        {
            get { return _properties; }
        }

        /// <summary>
        /// Gets a value indicating whether an unknown attribute is encountered during deserialization.
        /// </summary>
        /// <returns>
        /// True when an unknown attribute is encountered while deserializing.
        /// </returns>
        /// <param name="name">The name of the unrecognized attribute.</param>
        /// <param name="value">The value of the unrecognized attribute.</param>
        protected override bool OnDeserializeUnrecognizedAttribute(string name, string value)
        {
            ConfigurationProperty property = new ConfigurationProperty(name, typeof(string), value);
            _properties.Add(property);
            base[property] = value;
            Attributes.Add(name, value);
            return true;
        }

        private NameValueCollection _attributes;
        public  NameValueCollection  Attributes
        {
            get { return _attributes ?? (_attributes = new NameValueCollection(StringComparer.OrdinalIgnoreCase));}
        }
    }
}