OpenSim-Test/OpenSim/Region/OptionalModules/Scripting/Minimodule/InventoryItem.cs

/*
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Text;

using OpenSim.Framework;
using OpenSim.Region.Framework.Scenes;
//using OpenSim.Services.AssetService;
using OpenMetaverse;
using OpenMetaverse.Assets;

namespace OpenSim.Region.OptionalModules.Scripting.Minimodule
{
    public class InventoryItem : IInventoryItem
    {
        TaskInventoryItem m_privateItem;
        Scene m_rootScene;
        
        public InventoryItem(Scene rootScene, TaskInventoryItem internalItem)
        {
            m_rootScene = rootScene;
            m_privateItem = internalItem;
        }

        // Marked internal, to prevent scripts from accessing the internal type
        internal TaskInventoryItem ToTaskInventoryItem()
        {
            return m_privateItem;
        }

        /// <summary>
        /// This will attempt to convert from an IInventoryItem to an InventoryItem object
        /// </summary>
        /// <description>
        /// In order for this to work the object which implements IInventoryItem must inherit from InventoryItem, otherwise
        /// an exception is thrown.
        /// </description>
        /// <param name="i">
        /// The interface to upcast <see cref="IInventoryItem"/>
        /// </param>
        /// <returns>
        /// The object backing the interface implementation <see cref="InventoryItem"/>
        /// </returns>
        internal static InventoryItem FromInterface(IInventoryItem i)
        {
            if (typeof(InventoryItem).IsAssignableFrom(i.GetType()))
            {
                return (InventoryItem)i;
            }
            else
            {
                throw new ApplicationException("[MRM] There is no legal conversion from IInventoryItem to InventoryItem");
            }
        }
            
        public int Type { get { return m_privateItem.Type; } }
        public UUID AssetID { get { return m_privateItem.AssetID; } }
        
        // This method exposes OpenSim/OpenMetaverse internals and needs to be replaced with a IAsset specific to MRM.
        public T RetrieveAsset<T>() where T : OpenMetaverse.Assets.Asset, new()
        {
            AssetBase a = m_rootScene.AssetService.Get(AssetID.ToString());
            T result = new T();

            if ((sbyte)result.AssetType != a.Type)
                throw new ApplicationException("[MRM] The supplied asset class does not match the found asset");
            
            result.AssetData = a.Data;
            result.Decode();
            return result;
        }
    }
}