using LinFu.IoC.Interfaces;

namespace LinFu.IoC
{
    /// <summary>
    ///     Represents an <see cref="ICreateInstance" /> type that generates an object instance from an existing instance.
    /// </summary>
    internal class CreatorFromInstance : ICreateInstance
    {
        private readonly object _instance;

        /// <summary>
        ///     Initializes the class with the target <paramref name="instance" />.
        /// </summary>
        /// <param name="instance">The instance that will be returned every time the <see cref="CreateFrom" /> method is called.</param>
        internal CreatorFromInstance(object instance)
        {
            _instance = instance;
        }


        /// <summary>
        ///     Returns the object instance that given when the <see cref="CreatorFromInstance" /> class instance was initialized.
        /// </summary>
        /// <param name="factoryRequest">
        ///     The <see cref="IFactoryRequest" /> instance that describes the context of the service
        ///     request.
        /// </param>
        /// <param name="factory">The <see cref="IFactory" /> instance that will be used to instantiate the service type.</param>
        /// <returns>A valid service instance.</returns>
        public object CreateFrom(IFactoryRequest factoryRequest, IFactory factory)
        {
            return _instance;
        }
    }
}