[jboss-jira] [JBoss JIRA] (DROOLS-1543) DMN ItemDefinition dependencies ordering

[Edson Tirelli (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-1543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edson Tirelli updated DROOLS-1543:
----------------------------------
    Affects Version/s: 7.0.0.CR3


> DMN ItemDefinition dependencies ordering
> ----------------------------------------
>
>                 Key: DROOLS-1543
>                 URL: https://issues.jboss.org/browse/DROOLS-1543
>             Project: Drools
>          Issue Type: Bug
>          Components: dmn engine
>    Affects Versions: 7.0.0.CR3
>            Reporter: Matteo Mortari
>            Assignee: Matteo Mortari
>             Fix For: 7.1.0.Final
>
>
> Using Java-api Comparator is not easily suitable to address the problem of ordering the ItemDefinition by their dependencies.
> If the Comparator is used to check purely for dependencies, returning 0 for indipendent elements, assume the following:
> {code:java}
> X
> Y -> Z
> {code}
> where X is independent from Y, Z; and Y depends on Z.
> {code:java}
> compare(X, Y) == 0 // by definition above
> compare(X, Z) == 0 // still, by definition above, X is independent also from Z
> compare(Y, Z) == 1 // because Y depends on Z, Y is bigger than Z.
> {code}
> The above breaks the API contract in the Java-API Comparator where stating:
> {quote}Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.{quote}



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