[rules-users] Question about Object.equals and modifyRetract/Insert

[Edson Tirelli]

   It is fine to do that.


2008/10/13 Michal Bali <michalbali at gmail.com>

> Hello,
>
> Let's say we have a simple BeanA with one property that is part of
> equal/hashCode method e.g.:
> ----------------------------------------
> public class BeanA {
>   int someProperty;
>
>   public int getSomeProperty() {
>     return someProperty;
>   }
>   public void setSomeProperty(int someProperty) {
>     this.someProperty = someProperty;
>   }
>
>   @Override
>   public boolean equals(final Object other) {
>     if (this == other)
>       return true;
>     if (!(other instanceof BeanA))
>       return false;
>     BeanA castOther = (BeanA) other;
>     return new EqualsBuilder().append(someProperty,
>         castOther.someProperty).isEquals();
>   }
>
>   @Override
>   public int hashCode() {
>     return new HashCodeBuilder(228431015, 1383549405).append(
>         someProperty).toHashCode();
>   }
> }
> ------------------------------------
> This bean is inserted into the working memory. Is it something wrong with
> doing?:
> wm.modifyRetract(beanA);
> beanA.setSomeProperty(22); //this is changing the object equality key
> wm.modifyInsert(beanAHandle, beanA);
>
> I know that simple update is not allowed:
> beanA.SetSomeProperty(22);
> update(beanAHandle, beanA); //this is wrong
>
> I guess there is no difference if this code is outside the rule engine or
> inside (e.g. in a rule consequence).
>
> Thank you,
> Best Regards,
> Michal
>
>
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>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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