ArrayDescriptor.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 System.Collections.Generic;
using System.Reflection;

namespace SiliconStudio.Core.Reflection
{
    /// <summary>
    /// A descriptor for an array.
    /// </summary>
    public class ArrayDescriptor : ObjectDescriptor
    {
        private readonly Type elementType;
        private readonly Type listType;
        private readonly MethodInfo toArrayMethod;

        /// <summary>
        /// Initializes a new instance of the <see cref="ObjectDescriptor" /> class.
        /// </summary>
        /// <param name="factory">The factory.</param>
        /// <param name="type">The type.</param>
        /// <exception cref="System.ArgumentException">Expecting arrat type;type</exception>
        public ArrayDescriptor(ITypeDescriptorFactory factory, Type type)
            : base(factory, type)
        {
            if (!type.IsArray) throw new ArgumentException("Expecting array type", "type");

            if (type.GetArrayRank() != 1)
            {
                throw new ArgumentException("Cannot support dimension [{0}] for type [{1}]. Only supporting dimension of 1".ToFormat(type.GetArrayRank(), type.FullName));
            }

            Category = DescriptorCategory.Array;
            elementType = type.GetElementType();
            listType = typeof(List<>).MakeGenericType(ElementType);
            toArrayMethod = listType.GetMethod("ToArray");
        }

        /// <summary>
        /// Gets the type of the array element.
        /// </summary>
        /// <value>The type of the element.</value>
        public Type ElementType
        {
            get
            {
                return elementType;
            }
        }

        /// <summary>
        /// Creates the equivalent of list type for this array.
        /// </summary>
        /// <returns>A list type with same element type than this array.</returns>
        public Array CreateArray(int dimension)
        {
            return Array.CreateInstance(ElementType, dimension);
        }
    }
}