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//
// System.Runtime.Serialization.ObjectIDGenerator.cs
//
// Author: Duncan Mak (duncan@ximian.com)
//
// (C) Ximian, Inc.
//
using System;
using System.Collections;
using System.Runtime.Serialization;
namespace System.Runtime.Serialization
{
[Serializable]
public class ObjectIDGenerator
{
// Private field
Hashtable table;
long current; // this is the current ID, starts at 1
// constructor
public ObjectIDGenerator ()
: base ()
{
table = new Hashtable ();
current = 1;
}
// Methods
public virtual long GetId (object obj, out bool firstTime)
{
if (obj == null)
throw new ArgumentNullException ("The obj parameter is null.");
if (table.ContainsKey (obj)) {
firstTime = false;
return (long) table [obj];
} else {
firstTime = true;
table.Add (obj, current);
return current ++;
}
}
public virtual long HasId (object obj, out bool firstTime)
{
if (obj == null)
throw new ArgumentNullException ("The obj parameter is null.");
if (table.ContainsKey (obj)) {
firstTime = false;
return (long) table [obj];
} else {
firstTime = true;
return 0L; // 0 is the null ID
}
}
}
}
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