opensim/OpenSim/Data/DBGuids.cs

/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 */

using System;
using System.Collections.Generic;
using System.Text;
using OpenMetaverse;

namespace OpenSim.Data
{

    public static class DBGuid
    {
        /// <summary>This function converts a value returned from the database in one of the
        /// supported formats into a UUID.  This function is not actually DBMS-specific right
        /// now
        ///
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public static UUID FromDB(object id)
        {
            if ((id == null) || (id == DBNull.Value))
                return UUID.Zero;

            Type idtype = id.GetType();

            if (idtype == typeof(string))
            {
                UUID.TryParse((string)id, out UUID result);
                return result;
            }

            if (idtype == typeof(Guid))
                return new UUID((Guid)id);

            if (idtype == typeof(byte[]))
            {
                byte[] idb = (byte[])id;
                return idb.Length < 16 ? UUID.Zero : new UUID(idb, 0);
            }

            throw new Exception("Failed to convert db value to UUID: " + id.ToString());
        }
    }
}