/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2011  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */

using Db4objects.Db4o.Foundation;

namespace Db4objects.Db4o.Internal
{
    /// <exclude></exclude>
    public class TreeIntObject : TreeInt
    {
        public object _object;

        public TreeIntObject(int a_key) : base(a_key)
        {
        }

        public TreeIntObject(int a_key, object a_object) : base(a_key)
        {
            _object = a_object;
        }

        public override object ShallowClone()
        {
            return ShallowCloneInternal(new TreeIntObject(_key));
        }

        protected override Tree ShallowCloneInternal(Tree tree)
        {
            var tio = (TreeIntObject
                ) base.ShallowCloneInternal(tree);
            tio._object = _object;
            return tio;
        }

        public virtual object GetObject()
        {
            return _object;
        }

        public virtual void SetObject(object obj)
        {
            _object = obj;
        }

        public override object Read(ByteArrayBuffer a_bytes)
        {
            var key = a_bytes.ReadInt();
            object obj = null;
            if (_object is TreeInt)
            {
                obj = new TreeReader(a_bytes, (IReadable) _object).Read();
            }
            else
            {
                obj = ((IReadable) _object).Read(a_bytes);
            }
            return new TreeIntObject(key, obj);
        }

        public override void Write(ByteArrayBuffer a_writer)
        {
            a_writer.WriteInt(_key);
            if (_object == null)
            {
                a_writer.WriteInt(0);
            }
            else
            {
                if (_object is TreeInt)
                {
                    Write(a_writer, (TreeInt) _object);
                }
                else
                {
                    ((IReadWriteable) _object).Write(a_writer);
                }
            }
        }

        public override int OwnLength()
        {
            if (_object == null)
            {
                return Const4.IntLength*2;
            }
            return Const4.IntLength + ((IReadable) _object).MarshalledLength();
        }

        internal override bool VariableLength()
        {
            return true;
        }

        public static TreeIntObject Add(TreeIntObject
            tree, int key, object value)
        {
            return ((TreeIntObject) Add(tree, new TreeIntObject
                (key, value)));
        }
    }
}