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https://issues.apache.org/jira/browse/LANG-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Yandell closed LANG-449.
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Resolution: Duplicate
This is a duplicate of the annotations for builders request in LANG-395.
> Implement equals, hashCode and toString replacement
> ---------------------------------------------------
>
> Key: LANG-449
> URL: https://issues.apache.org/jira/browse/LANG-449
> Project: Commons Lang
> Issue Type: Improvement
> Reporter: Vincenzo Vitale
> Priority: Minor
>
> In my company (TomTom), we have internally developed a replacement of the
> equals, hashcode and toString methods.
> The base idea is to use the annotation @BusinessObject at the class level and
> @BusinessField at field level. Then what developers normally do is to
> override the three methods delegating to the utility methods:
> @Override
> public boolean equals(Object obj) { return BeanUtils.equals(this, obj); }
> @Override
> public int hashCode() { return BeanUtils.hashCode(this); }
> @Override
> public String toString() { return BeanUtils.toString(this); }
> And i.e. the method signature of equals is:
> /**
> * Compare two @BusinessObject beans comparing only the {...@link
> BusinessField}
> * annotated fields.
> *
> * @param firstBean First bean to compare.
> * @param secondBean Second bean to compare.
> * @return The equals result.
> * @throws IllegalArgumentException If one of the beans compared is not an
> * instance of a {...@link BusinessObject} annotated class.
> */
> public static boolean equals(Object firstBean, Object secondBean);
> In the last versions of EqualsBuilder now there is the new method
> reflectionEquals... but there is no a way to specify what to include in the
> comparison. With our two annotations we are able to let developers exactly
> define what need to be included in a Business comparison, as i.e. normally
> required by persistence framework like hibernate.
> The current implementation can also handle more complex case, comparing
> correctly totally different kind of objects.
> For example if all my business logic cares only about the color, I can define:
> @BusinessObject
> public class Cat{
> }
> public class ColouredCat extends Cat{ @BusinessField private String color;
> getter/setter }
> @BusinessObject
> public class SunSet{ @BusinessField private String color="red"; getter/setter
> }
> and then compare any instance of ColouredCat with a Sunset instance, finding
> out that the redColouredCat is (for my business logic) equal to a default
> instance of a Sunset. And also more tricky cases are handled (different
> BusinessFields, no BusinessObject annotation and so on).
> We intensively use Hibernate and the utility demonstrated to work fine with
> CGLIB proxies
> We always thought about the possibility to create a new Open Source project
> but then it was decided it would be better adding the feature to an already
> well know open source project...
> If you are interested I can send you more details. How can we (me more one
> other developer) eventually became committers?
> Thanks in advance,
> Vicio.
> P.s.: an utility method to automatically populate the BusinessFields of a
> BusinessObject is also implemented.
> P.s.2: In the meanwhile I started creating a new OpenSource project here:
> http://code.google.com/p/simplestuff/
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