[forge-issues] [JBoss JIRA] (FORGE-386) PersistencePlugin needs to generate hashCode and equals based on Id

[Richard Kennard (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/FORGE-386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647848#comment-12647848 ] 

Richard Kennard commented on FORGE-386:
---------------------------------------

Perfect for my needs! Thanks!
                
> PersistencePlugin needs to generate hashCode and equals based on Id
> -------------------------------------------------------------------
>
>                 Key: FORGE-386
>                 URL: https://issues.jboss.org/browse/FORGE-386
>             Project: Forge
>          Issue Type: Enhancement
>            Reporter: Richard Kennard
>            Assignee: Lincoln Baxter III
>             Fix For: 1.0.0.Beta4
>
>
> Domain classes generated by Forge need to override hashCode/equals if they are to be useful in a UI (among other places). This is hard to do if we know nothing about the semantics of the class, but the PersistencePlugin *does* know something: namely, the Id.
> The following implementation would suffice for my purposes:
> 	@Override
> 	public boolean equals(Object that) {
> 		if (this == that) {
> 			return true;
> 		}
> 		if (that == null) {
> 			return false;
> 		}
> 		if (getClass() != that.getClass()) {
> 			return false;
> 		}
> 		if (id != null) {
> 			return id.equals(((Employer) that).id);
> 		}
> 		return super.equals(that);
> 	}
> 	@Override
> 	public int hashCode() {
> 		if (id != null) {
> 			return id.hashCode();
> 		}
> 		return super.hashCode();
> 	}
> But I'm happy for other implementations too.

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