GenericComposite.cs

namespace NHapi.Base.Model
{
    using System.Collections;
    using System.Collections.Generic;

    /// <summary>
    /// An unspecified Composite datatype that has an undefined number of components, each
    /// of which is a Varies.
    /// This is used to store Varies data, when the data type is unknown.  It is also
    /// used to store unrecognized message constituents.
    /// </summary>
    /// <author>Bryan Tripp.</author>
    public class GenericComposite : AbstractType, IComposite
    {
        private readonly List<IType> components;

        /// <summary>
        /// Creates a new instance of GenericComposite.
        /// </summary>
        /// <param name="theMessage">message to which this Type belongs.</param>
        public GenericComposite(IMessage theMessage)
            : this(theMessage, null)
        {
        }

        /// <summary>
        /// Creates a new instance of GenericComposite.
        /// </summary>
        /// <param name="theMessage">message to which this Type belongs.</param>
        /// <param name="description">The description of this type.</param>
        public GenericComposite(IMessage theMessage, string description)
            : base(theMessage, description)
        {
            components = new List<IType>(20);
        }

        /// <summary>
        /// Returns an array containing the components of this field.
        /// </summary>
        public virtual IType[] Components => components.ToArray();

        /// <summary>
        /// Returns the name of the type (used in XML encoding and profile checking).
        /// </summary>
        public override string TypeName => "UNKNOWN";

        /// <summary>
        /// Returns the single component of this composite at the specified position (starting at 0) -
        /// Creates it (and any nonexistent components before it) if necessary.
        /// </summary>
        public virtual IType this[int index]
        {
            get
            {
                for (var i = components.Count; i <= index; i++)
                {
                    components.Add(new Varies(Message));
                }

                return components[index];
            }
        }
    }
}