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https://issues.apache.org/jira/browse/LANG-637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462048#comment-13462048
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Duncan Jones commented on LANG-637:
-----------------------------------
After some consideration, I'm struggling to imagine _what_ exactly could be
useful about a separate {{Diff}} object. In principle it seems like a fine idea
and the first thing that came to mind would be methods to retrieve the
differences via suitable getter methods. However, I can't think of a way to
implement an interface that is not quite ugly.
Building the differences is elegant enough, via methods such as:
{code}
addBytes(String fieldName, byte lhs, byte rhs);
{code}
but storing and retrieving them seems challenging, other than as {{Object}} s.
Can anyone suggest how a {{Diff}} class could be structured and used? If not,
then I may continue along the lines of my previous suggestions and focus on a
{{DiffBuilder}} class that produces a {{String}}, much like
{{ToStringBuilder}}.
> There should be a DifferenceBuilder with a ReflectionDifferenceBuilder
> implementation
> -------------------------------------------------------------------------------------
>
> Key: LANG-637
> URL: https://issues.apache.org/jira/browse/LANG-637
> Project: Commons Lang
> Issue Type: Improvement
> Components: lang.builder.*
> Reporter: Eric Lewis
> Priority: Minor
> Fix For: 3.x
>
> Attachments: DifferenceBuilder.java, DifferenceBuilderTest.java,
> Differentiable.java
>
>
> The ToStringBuilder and ReflectionToStringBuilder are great tools for
> everyday development.
> We use them to show all the properties in an object, which comes handy
> especially for testing.
> However, JUnit with its assertEquals() just outputs the toString() of the two
> compared objects. For complex objects, this becomes unreadable.
> So, it would be great to have a DifferenceBuilder with a
> ReflectionDifferenceBuilder implementation to be able to get only the
> differing properties of two objects. The question is whether the two objects
> would have to be of the same type or not.
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