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From "Mark Lewis (JIRA)" <>
Subject [jira] Created: (BEANUTILS-304) BeanDiff - encapsulate, apply, and merge bean differences
Date Thu, 07 Feb 2008 16:24:08 GMT
BeanDiff - encapsulate, apply, and merge bean differences

                 Key: BEANUTILS-304
             Project: Commons BeanUtils
          Issue Type: New Feature
          Components: Bean / Property Utils, Bean-Collections, ConvertUtils & Converters,
    Affects Versions: LATER THAN 1.8.0
            Reporter: Mark Lewis
             Fix For: LATER THAN 1.8.0

It would be great to have a way to compare two beans and capture the diff somehow.  This is
just my initial brainstorm on the idea:

- The BeanDiff class encapsulates differences between two beans -of the same type-, the source
bean and the target bean.
- A BeanDiff instance represents what property assignments would be necessary to turn the
target bean into the source bean.
- A BeanDiff can be applied to a target bean, performing the necessary property assignments
to make its property values exactly match the source bean.
- Two BeanDiff instances can be merged into a single BeanDiff instance, allowing multiple
source beans to be merged into one target bean.
- If a conflict would occur during a merge (from a property being assigned two different values),
a BeanDiffConflictException is thrown.
- The BeanDiffConflictException contains an array of BeanDiffConflict objects.
- Each BeanDiffConflict instance represents a single property and the two conflicting values
that were to be assigned.

- All these actions would work on DynaBeans as well.
- +Converters would be able to account for type differences in source and target bean properties.+

An example of how this could be used is when dealing with ORM and optimistic locking.  Knowing
exactly which properties have been modified would allow concurrent modification of a bean
(record) without fear of reasserting the original values and destroying someone else's changes.

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