/******************************************************************************
* The MIT License
* Copyright (c) 2003 Novell Inc.  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 
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*******************************************************************************/
//
// Novell.Directory.Ldap.Controls.LdapSortKey.cs
//
// Author:
//   Sunil Kumar (Sunilk@novell.com)
//
// (C) 2003 Novell, Inc (http://www.novell.com)
//

using System;
namespace Novell.Directory.Ldap.Controls
{
	
	/// <summary> Encapsulates parameters for sorting search results.
	/// </summary>
	public class LdapSortKey
	{
		/// <summary> Returns the attribute to used for sorting.
		/// 
		/// </summary>
		/// <returns> The name of the attribute used for sorting.
		/// </returns>
		virtual public System.String Key
		{
			get
			{
				return key;
			}
			
		}
		/// <summary> Returns the sorting order, ascending or descending.
		/// 
		/// </summary>
		/// <returns> True if the sorting is done is descending order; false, if the
		/// sorting is done is ascending order.
		/// </returns>
		virtual public bool Reverse
		{
			get
			{
				return reverse;
			}
			
		}
		/// <summary> Returns the OID to be used as a matching rule.
		/// 
		/// </summary>
		/// <returns> The OID to be used as matching rule, or null if none is to be
		/// used.
		/// </returns>
		virtual public System.String MatchRule
		{
			get
			{
				return matchRule;
			}
			
		}
		
		private System.String key;
		private bool reverse;
		private System.String matchRule;
		
		// Constructors
		
		/// <summary> Constructs a new LdapSortKey object using an attribute as the sort key.
		/// 
		/// </summary>
		/// <param name="keyDescription">The single attribute to use for sorting. If the
		/// name is preceded by a minus sign (-), the sorting
		/// is done in reverse (descending) order. 
		/// An OID for a matching rule may be appended
		/// following a ":".
		/// 
		/// Examples:
		/// <ul>
		/// <li> "cn" (sorts in ascending order by the cn attribute)</li>
		/// <li> "-cn" (sorts in descending order by the cn attribute) </li>
		/// <li> "cn:1.2.3.4.5" (sorts in ascending order by the cn attribute
		/// using the matching rule 1.2.3.4.5) </li>
		/// </ul>
		/// </param>
		public LdapSortKey(System.String keyDescription)
		{
			matchRule = null;
			reverse = false;
			System.String myKey = keyDescription;
			if (myKey[0] == '-')
			{
				myKey = myKey.Substring(1);
				this.reverse = true;
			}
			int pos = myKey.IndexOf(":");
			if (pos != - 1)
			{
				this.key = myKey.Substring(0, (pos) - (0));
				this.matchRule = myKey.Substring(pos + 1);
			}
			else
			{
				this.key = myKey;
			}
			return ;
		}
		
		/// <summary> Constructs a new LdapSortKey object with the specified attribute name
		/// and sort order.
		/// 
		/// </summary>
		/// <param name="key">    The single attribute to use for sorting.
		/// 
		/// </param>
		/// <param name="reverse">If true, sorting is done in descending order. If false,
		/// sorting is done in ascending order.
		/// </param>
		public LdapSortKey(System.String key, bool reverse):this(key, reverse, null)
		{
			return ;
		}
		
		/// <summary> Constructs a new LdapSortKey object with the specified attribute name,
		/// sort order, and a matching rule.
		/// 
		/// </summary>
		/// <param name="key">    The attribute name (for example, "cn") to use for sorting.
		/// 
		/// </param>
		/// <param name="reverse">  If true, sorting is done in descending order. If false,
		/// sorting is done in ascending order.
		/// 
		/// </param>
		/// <param name="matchRule">  The object ID (OID) of a matching rule used for
		/// collation. If the object will be used to request
		/// server-side sorting of search results, it should
		/// be the OID of a matching rule known to be
		/// supported by that server.
		/// </param>
		public LdapSortKey(System.String key, bool reverse, System.String matchRule)
		{
			this.key = key;
			this.reverse = reverse;
			this.matchRule = matchRule;
			return ;
		}
	}
}