using System;
using System.Collections.Generic;

namespace Caliburn.Metadata
{
    public abstract class MetadataContainer
    {
        protected readonly Dictionary<Type, object> _metadata = new Dictionary<Type, object>();

        public virtual void AddMetadata(MetadataProvider metadata)
        {
            _metadata[metadata.GetType()] = metadata;
        }

        public virtual T GetMetadata<T>()
        {
            object metadata;

            _metadata.TryGetValue(typeof(T), out metadata);

            if(metadata != null) return (T) metadata;
            else return default(T);
        }
    }
}