// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using Microsoft.Xml;
using System.Collections.Generic;
 
 
namespace System.Runtime.Serialization
{
    internal class HybridObjectCache
    {
        private Dictionary<string, object> _objectDictionary;
        private Dictionary<string, object> _referencedObjectDictionary;
 
        internal HybridObjectCache()
        {
        }
 
        internal void Add(string id, object obj)
        {
            if (_objectDictionary == null)
                _objectDictionary = new Dictionary<string, object>();
 
            object existingObject;
            if (_objectDictionary.TryGetValue(id, out existingObject))
                throw /*System.Runtime.Serialization.*/DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(string.Format(SRSerialization.MultipleIdDefinition, id)));
            _objectDictionary.Add(id, obj);
        }
 
        internal void Remove(string id)
        {
            if (_objectDictionary != null)
                _objectDictionary.Remove(id);
        }
 
        internal object GetObject(string id)
        {
            if (_referencedObjectDictionary == null)
            {
                _referencedObjectDictionary = new Dictionary<string, object>();
                _referencedObjectDictionary.Add(id, null);
            }
            else if (!_referencedObjectDictionary.ContainsKey(id))
            {
                _referencedObjectDictionary.Add(id, null);
            }
 
            if (_objectDictionary != null)
            {
                object obj;
                _objectDictionary.TryGetValue(id, out obj);
                return obj;
            }
 
            return null;
        }
 
        internal bool IsObjectReferenced(string id)
        {
            if (_referencedObjectDictionary != null)
            {
                return _referencedObjectDictionary.ContainsKey(id);
            }
            return false;
        }
    }
}