/src/FluentNHibernate/Testing/PersistenceSpecification.cs

using System.Collections;

using System.Collections.Generic;

using FluentNHibernate.Testing.Values;

using FluentNHibernate.Utils;

using NHibernate;



namespace FluentNHibernate.Testing

{

    public class PersistenceSpecification<T>

    {

        protected readonly List<Property<T>> allProperties = new List<Property<T>>();

        private readonly ISession currentSession;

        private readonly IEqualityComparer entityEqualityComparer;

        private readonly bool hasExistingSession;



        public PersistenceSpecification(ISessionSource source)

            : this(source.CreateSession())

        {

        }



        public PersistenceSpecification(ISessionSource source, IEqualityComparer entityEqualityComparer)

            : this(source.CreateSession(), entityEqualityComparer)

        {

        }



        public PersistenceSpecification(ISession session)

            : this(session, null)

        {

        }



        public PersistenceSpecification(ISession session, IEqualityComparer entityEqualityComparer)

        {

            currentSession = session;

            hasExistingSession = currentSession.Transaction != null && currentSession.Transaction.IsActive;

            this.entityEqualityComparer = entityEqualityComparer;

        }



        public void VerifyTheMappings()

        {

            // CreateProperties the initial copy

            var first = typeof(T).InstantiateUsingParameterlessConstructor<T>();



            // Set the "suggested" properties, including references

            // to other entities and possibly collections

            allProperties.ForEach(p => p.SetValue(first));



            // Save the first copy

            TransactionalSave(first);



            object firstId = currentSession.GetIdentifier(first);



            // Clear and reset the current session

            currentSession.Flush();

            currentSession.Clear();



            // "Find" the same entity from the second IRepository

            var second = currentSession.Get<T>(firstId);



            // Validate that each specified property and value

            // made the round trip

            // It's a bit naive right now because it fails on the first failure

            allProperties.ForEach(p => p.CheckValue(second));

        }



        public void TransactionalSave(object propertyValue)

        {

            if (hasExistingSession)

            {

                currentSession.Save(propertyValue);

            }

            else

            {

                using (var tx = currentSession.BeginTransaction())

                {

                    currentSession.Save(propertyValue);

                    tx.Commit();

                }

            }

        }



        public PersistenceSpecification<T> RegisterCheckedProperty(Property<T> property)

        {

            property.EntityEqualityComparer = entityEqualityComparer;

            allProperties.Add(property);



            property.HasRegistered(this);



            return this;

        }

    }

}