XmlXsdDocument

using System;

namespace Puma.Xml
{
	public class XmlXsdNodeCollectionFragment : Puma.Collections.Shred
	{
        public XmlXsdNodeCollectionFragment(string Name, Puma.Collections.ShredCollector Container, XsdNode TemplateXsdNode)
            : base(Name, Container)
        {
            _templateXsdNode = TemplateXsdNode;
        }

        private readonly XsdNode _templateXsdNode;

        public XsdNode TemplateXsdNode { get { return _templateXsdNode; } }

        public XmlXsdNode this[int Index] { get { return (XmlXsdNode)base.GetItem(Index); } }

        public XmlXsdNode LastNode { get { return Count == 0 ? null : (XmlXsdNode)GetItem(Count - 1); } }

        public XmlXsdNode InsertXmlXsdNode(int Index)
        {
            System.Diagnostics.Debug.Assert(_templateXsdNode != null);

            if (Index > Count) throw new Puma.Xml.XmlExceptions.ChildCollectionXmlException(Puma.Xml.XmlExceptions.ChildCollectionExceptionCode.NodeIndexInvalid);

            if (Count >= _templateXsdNode.MinMaxOccurs.Max) throw new Puma.Xml.XmlExceptions.ChildCollectionXmlException(Puma.Xml.XmlExceptions.ChildCollectionExceptionCode.MaxOccursLimitExcited);

            XmlXsdNode newNode = new XmlXsdNodeConstructor(GetPervXmlElementInContainer(), _templateXsdNode.XmlSchemaElement, (XmlXsdNode)_templateXsdNode.container.Parent);

            base.Insert(Index, newNode);

            return newNode;
        }

        public XmlXsdNode RemoveXmlXsdNode(int Index)
        {
            XmlXsdNode oldNode = (XmlXsdNode)GetItem(Index);

            System.Diagnostics.Debug.Assert(oldNode.Parent is XmlXsdNode);

            if (Index > Count) throw new Puma.Xml.XmlExceptions.ChildCollectionXmlException(Puma.Xml.XmlExceptions.ChildCollectionExceptionCode.NodeIndexInvalid);

            ((XmlXsdNode)oldNode.Parent).XmlNode.XmlElement.RemoveChild(oldNode.XmlNode.XmlElement);

            base.Remove(Index);

            return oldNode;
        }

        private System.Xml.XmlElement GetPervXmlElementInContainer()
        {
           
            XmlXsdNodeCollectionFragment iterFragment = this;

            while (iterFragment != null)
            {
                if (iterFragment.Count != 0)
                {
                    return iterFragment.LastNode.XmlNode.XmlElement;
                }

                iterFragment = (XmlXsdNodeCollectionFragment)iterFragment.Container.GetPerviousShred(iterFragment.Name);
            }
           
            return null;
        }


        #region Puma.Collections.Shred

        public override bool IsCanInsert
        {
            get
            {
                if (this.Count >= this.TemplateXsdNode.MinMaxOccurs.Max) return false;
                else return true;
            }
        }

        public override bool IsCanRemove
        {
            get
            {
                if (this.Count <= this.TemplateXsdNode.MinMaxOccurs.Min) return false;
                else return true;
            }
        }

        #endregion

    }
}