Do the *Result objects in Database have a common ancestor?

Question

I'm doing some polymorphic programming, and I decided that I wanted to be able to gracefully handle partial saves using SaveResult without blocking the user experience. The code looks roughly like this:

static void logDmlErrors(SObject[] src, SObject[] dest, SaveResult[] results, String message) {
    // Transform results into Chatter error messages, send them to admins
}

I then went about writing the utility methods that would use this function:

public static void insertRecords(SObject[] src, SObject[] dest, String message) {
    logDmlErrors(src, dest, Database.insert(dest, false), message);
}

Everything went well, until I came across the delete and undelete methods, which instead use DeleteResult and UndeleteResult. Both of those two classes contain the exact same methods as SaveResult, and yet don't appear to inherit from a common ancestor. This means that I can't just cast to a super-type to get to this information.

Thankfully, Summer 16 apparently introduced support for serializing (and deserializing) these classes as JSON, so I do have a fairly expensive (but accurate) workaround if I want proper polymorphic behavior, but I thought I'd throw it out there and see if someone has an alternative solution to this problem.

Answer 1

Don't forget Database.UpsertResult!

In my DML library, I wrote a GenericResult class and used a factory pattern. For maximum reusability, you could certainly incorporate constructor overloads.

public class GenericResult
{
    final Id recordId;
    final List<Database.Error> errors;
    public Id getId() { return recordId; }
    public List<Database.Error> getErrors() { return errors; }

    public GenericResult(Id recordId, List<Database.Error> errors)
    {
        this.recordId = recordId;
        this.errors = (errors != null) ? errors : new List<Database.Error>();
    }
    public GenericResult(Database.SaveResult result)
    {
        this(result.getId(), this.getErrors());
    }
    public GenericResult(Database.UpsertResult result)
    {
        this(result.getId(), this.getErrors());
    }
    public GenericResult(Database.DeleteResult result)
    {
        this(result.getId(), this.getErrors());
    }
    public GenericResult(Database.UndeleteResult result)
    {
        this(result.getId(), this.getErrors());
    }
}