ValidateValueMetadata.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;

namespace SiliconStudio.Core
{
    /// <summary>
    /// Delegate ValidateValueCallback used by <see cref="ValidateValueMetadata"/>.
    /// </summary>
    /// <param name="value">The value to validate.</param>
    /// <returns>The same value or a coerced value.</returns>
    public delegate void ValidateValueCallback<T>(ref T value);

    public abstract class ValidateValueMetadata : PropertyKeyMetadata
    {
        public static ValidateValueMetadata<T> New<T>(ValidateValueCallback<T> invalidationCallback)
        {
            return new ValidateValueMetadata<T>(invalidationCallback);
        }

        public abstract void Validate(ref object obj);
    }

    /// <summary>
    /// A metadata to allow validation/coercision of a value before storing the value into the <see cref="PropertyContainer"/>.
    /// </summary>
    public class ValidateValueMetadata<T> : ValidateValueMetadata
    {
        private readonly ValidateValueCallback<T> validateValueCallback;

        /// <summary>
        /// Initializes a new instance of the <see cref="ValidateValueMetadata"/> class.
        /// </summary>
        /// <param name="validateValueCallback">The validate value callback.</param>
        /// <exception cref="System.ArgumentNullException">validateValueCallback</exception>
        public ValidateValueMetadata(ValidateValueCallback<T> validateValueCallback)
        {
            if (validateValueCallback == null) throw new ArgumentNullException("validateValueCallback");
            this.validateValueCallback = validateValueCallback;
        }

        /// <summary>
        /// Gets the validate value callback.
        /// </summary>
        /// <value>The validate value callback.</value>
        public ValidateValueCallback<T> ValidateValueCallback
        {
            get
            {
                return validateValueCallback;
            }
        }

        public override void Validate(ref object obj)
        {
            T objCopy = (T)obj;
            validateValueCallback(ref objCopy);
            obj = objCopy;
        }
    }
}