ObjectReferenceStack.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Serialization / System / Runtime / Serialization / ObjectReferenceStack.cs / 1305376 / ObjectReferenceStack.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Runtime.Serialization 
{
    using System; 
    using System.Xml; 
    using System.Collections.Generic;
 
    struct ObjectReferenceStack
    {
        const int MaximumArraySize = 16;
        const int InitialArraySize = 4; 

        int count; 
        object[] objectArray; 
        bool[] isReferenceArray;
        Dictionary objectDictionary; 

        internal void Push(object obj)
        {
            if (objectArray == null) 
            {
                objectArray = new object[InitialArraySize]; 
                objectArray[count++] = obj; 
            }
            else if (count < MaximumArraySize) 
            {
                if (count == objectArray.Length)
                    Array.Resize(ref objectArray, objectArray.Length*2);
                objectArray[count++] = obj; 
            }
            else 
            { 
                if (objectDictionary == null)
                    objectDictionary = new Dictionary(); 

                objectDictionary.Add(obj, null);
                count++;
            } 
        }
 
        internal void EnsureSetAsIsReference(object obj) 
        {
            if (count == 0) 
                return;
            if (count > MaximumArraySize)
            {
                if (objectDictionary == null) 
                {
                    Fx.Assert("Object reference stack in invalid state"); 
                } 
                objectDictionary.Remove(obj);
            } 
            else
            {
                if ((objectArray != null) && objectArray[count - 1] == obj)
                { 
                    if (isReferenceArray == null)
                    { 
                        isReferenceArray = new bool[InitialArraySize]; 
                    }
                    else if (count == isReferenceArray.Length) 
                    {

                        Array.Resize(ref isReferenceArray, isReferenceArray.Length * 2);
                    } 
                    isReferenceArray[count - 1] = true;
                } 
            } 
        }
 
        internal void Pop(object obj)
        {
            if (count > MaximumArraySize)
            { 
                if (objectDictionary == null)
                { 
                    Fx.Assert("Object reference stack in invalid state"); 
                }
                objectDictionary.Remove(obj); 
            }
            count--;
        }
 
        internal bool Contains(object obj)
        { 
            int currentCount = count; 
            if (currentCount > MaximumArraySize)
            { 
                if (objectDictionary != null && objectDictionary.ContainsKey(obj))
                    return true;
                currentCount = MaximumArraySize;
            } 
            for (int i=(currentCount-1);i>=0;i--)
            { 
                if (Object.ReferenceEquals(obj, objectArray[i]) && isReferenceArray != null && !isReferenceArray[i]) 
                    return true;
            } 
            return false;
        }

        internal int Count 
        {
            get { return count; } 
        } 

    } 

}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.


                        

                        

                        
                        
                    
                    

                        
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