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

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}