CreateNewInstanceCommand.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using System;

using SiliconStudio.Core.Reflection;

namespace SiliconStudio.Quantum.Commands
{
    public class CreateNewInstanceCommand : ModifyValueCommand
    {
        /// <inheritdoc/>
        public override string Name { get { return "CreateNewInstance"; } }

        /// <inheritdoc/>
        public override CombineMode CombineMode { get { return CombineMode.CombineOnlyForAll; } }

        /// <inheritdoc/>
        public override bool CanAttach(ITypeDescriptor typeDescriptor, MemberDescriptorBase memberDescriptor)
        {
            return (typeDescriptor.Type.IsNullable() && Nullable.GetUnderlyingType(typeDescriptor.Type).IsStruct())
                || (typeDescriptor.Type.IsAbstract && !(typeDescriptor is CollectionDescriptor) && !(typeDescriptor is DictionaryDescriptor));
        }

        /// <inheritdoc/>
        protected override object ModifyValue(object currentValue, ITypeDescriptor descriptor, object parameter)
        {
            return parameter != null ? Activator.CreateInstance((Type)parameter) : currentValue;
        }
    }
}