ImportContext.cs

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

namespace System.Xml.Serialization
{
    public class ImportContext
    {
        private bool shareTypes;

        private SchemaObjectCache cache;

        private Hashtable mappings;

        private Hashtable elements;

        private CodeIdentifiers typeIdentifiers;

        internal SchemaObjectCache Cache
        {
            get
            {
                if (cache == null)
                {
                    cache = new SchemaObjectCache();
                }
                return cache;
            }
        }

        internal Hashtable Elements
        {
            get
            {
                if (elements == null)
                {
                    elements = new Hashtable();
                }
                return elements;
            }
        }

        internal Hashtable Mappings
        {
            get
            {
                if (mappings == null)
                {
                    mappings = new Hashtable();
                }
                return mappings;
            }
        }

        public CodeIdentifiers TypeIdentifiers
        {
            get
            {
                if (typeIdentifiers == null)
                {
                    typeIdentifiers = new CodeIdentifiers();
                }
                return typeIdentifiers;
            }
        }

        public bool ShareTypes => shareTypes;

        public StringCollection Warnings => Cache.Warnings;

        public ImportContext(CodeIdentifiers identifiers, bool shareTypes)
        {
            typeIdentifiers = identifiers;
            this.shareTypes = shareTypes;
        }

        internal ImportContext()
            : this(null, shareTypes: false)
        {
        }
    }
}