Umbraco-CMS/src/Umbraco.Core/Models/Entities/DocumentEntitySlim.cs

using System.Collections.Generic;
using System.Linq;

namespace Umbraco.Core.Models.Entities
{

    /// <summary>
    /// Implements <see cref="IDocumentEntitySlim"/>.
    /// </summary>
    public class DocumentEntitySlim : ContentEntitySlim, IDocumentEntitySlim
    {
        private static readonly IReadOnlyDictionary<string, string> Empty = new Dictionary<string, string>();

        private IReadOnlyDictionary<string, string> _cultureNames;
        private IEnumerable<string> _publishedCultures;
        private IEnumerable<string> _editedCultures;

        /// <inheritdoc />
        public IReadOnlyDictionary<string, string> CultureNames
        {
            get => _cultureNames ?? Empty;
            set => _cultureNames = value;
        }

        /// <inheritdoc />
        public IEnumerable<string> PublishedCultures
        {
            get => _publishedCultures ?? Enumerable.Empty<string>();
            set => _publishedCultures = value;
        }

        /// <inheritdoc />
        public IEnumerable<string> EditedCultures
        {
            get => _editedCultures ?? Enumerable.Empty<string>();
            set => _editedCultures = value;
        }

        public ContentVariation Variations { get; set; }

        /// <inheritdoc />
        public bool Published { get; set; }

        /// <inheritdoc />
        public bool Edited { get; set; }
        
    }
}