/// <summary>
/// Merges two <see cref="EntitySetAggregateToken"/> that have the same entity set into one.
/// If the parameters do not share the the entity set, an exception is thrown.
/// </summary>
/// <param name="token1">First token that is going to be merged.</param>
/// <param name="token2">Second token that is going to be merged.</param>
/// <returns>
/// Returns a token with the same entitySet as the parameters and with expressions from both objects.
/// </returns>
public static EntitySetAggregateToken Merge(EntitySetAggregateToken token1, EntitySetAggregateToken token2)
{
if (token1 == null)
{
return(token2);
}
if (token2 == null)
{
return(token1);
}
ExceptionUtils.Equals(token1.entitySet, token2.entitySet);
return(new EntitySetAggregateToken(token1.entitySet, token1.expressions.Concat(token2.expressions)));
}