context: //
  // System.Runtime.Remoting.Channels.AggregateDictionary.cs
  //
  // Author: Lluis Sanchez Gual (lluis@ximian.com)
  //
  // 2002 (C) Copyright, Novell, Inc.
  //
  
  //
  // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  //
  // Permission is hereby granted, free of charge, to any person obtaining
  // a copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to
  // permit persons to whom the Software is furnished to do so, subject to
  // the following conditions:
  // 
  // The above copyright notice and this permission notice shall be
  // included in all copies or substantial portions of the Software.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  using System.Collections;
  
  namespace System.Runtime.Remoting.Channels
  {
  	[System.Runtime.InteropServices.ComVisible (true)]
  	internal class AggregateDictionary: IDictionary
  	{
  		IDictionary[] dictionaries;
  		ArrayList _values;
  		ArrayList _keys;
  		
  		public AggregateDictionary (IDictionary[] dics)
  		{
  			dictionaries = dics;
  		}
  		
  		public bool IsFixedSize 
  		{ 
  			get { return true; }
  		}		
  		
  		public bool IsReadOnly 
  		{ 
  			get { return true; }
  		} 
  		
  		public object this [object key]
  		{ 
  			get 
  			{
  				foreach (IDictionary dic in dictionaries)
  					if (dic.Contains (key)) return dic [key];
  				return null;
  			}
  			
  			set
  			{
  				throw new NotSupportedException ();
  			}
  		}
  		
  		public ICollection Keys 
  		{ 
  			get
  			{
  				if (_keys != null) return _keys;
  				
  				_keys = new ArrayList ();
  				foreach (IDictionary dic in dictionaries)
  					_keys.AddRange (dic.Keys);
  				return _keys;
  			}
  		} 
  		
  		public ICollection Values 
  		{ 
  			get
  			{
  				if (_values != null) return _values;
  				
  				_values = new ArrayList ();
  				foreach (IDictionary dic in dictionaries)
  					_values.AddRange (dic.Values);
  				return _values;
  			}
  		}
  		
  		public void Add (object key, object value)
  		{
  			throw new NotSupportedException ();
  		}
  		
  		public void Clear ()
  		{
  			throw new NotSupportedException ();
  		}
  		
  		public bool Contains (object ob)
  		{
  			foreach (IDictionary dic in dictionaries)
  				if (dic.Contains (ob)) return true;
  			return false;
  		}
  		
  		public IDictionaryEnumerator GetEnumerator ()
  		{
  			return new AggregateEnumerator (dictionaries);
  		}
  		
  		IEnumerator IEnumerable.GetEnumerator ()
  		{
  			return new AggregateEnumerator (dictionaries);
  		}
  		
  		public void Remove (object ob)
  		{
  			throw new NotSupportedException ();
  		}
  		
  		public void CopyTo (Array array, int index)
  		{
  			foreach (object ob in this)
  				array.SetValue (ob, index++);
  		}
  		
  		public int Count 
  		{ 
  			get
  			{
  				int c = 0;
  				foreach (IDictionary dic in dictionaries)
  					c += dic.Count;
  				return c;
  			}
  		}
  		
  		public bool IsSynchronized 
  		{ 
  			get { return false; }
  		}
  		
  		public object SyncRoot 
  		{ 
  			get { return this; }
  		} 
  	}
  	
  	internal class AggregateEnumerator: IDictionaryEnumerator
  	{
  		IDictionary[] dictionaries;
  		int pos = 0;
  		IDictionaryEnumerator currente;
  		
  		public AggregateEnumerator (IDictionary[] dics)
  		{
  			dictionaries = dics;
  			Reset ();
  		}
  		
  		public DictionaryEntry Entry 
  		{ 
  			get { return currente.Entry; }
  		}
  		
  		public object Key 
  		{
  			get { return currente.Key; }
  		}
  		
  		public object Value 
  		{ 
  			get { return currente.Value; }
  		}
  		
  		public object Current 
  		{ 
  			get { return currente.Current; }
  		}
  		
  		public bool MoveNext ()
  		{
  			if (pos >= dictionaries.Length) return false;
  
  			if (!currente.MoveNext()) 
  			{
  				pos++;
  				if (pos >= dictionaries.Length) return false;
  				currente = dictionaries [pos].GetEnumerator ();
  				return MoveNext ();
  			}
  			
  			return true;
  		}
  		
  		public void Reset ()
  		{
  			pos = 0;
  			if (dictionaries.Length > 0)
  
gt: 				currente = dictionaries [0].GetEnumerator ();