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https://issues.apache.org/jira/browse/LUCENE-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511347#comment-13511347
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Shai Erera commented on LUCENE-4565:
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In fact, now that I think of it, one should really care which child/sibling we
return. All that matters is how to traverse the taxonomy tree. You start from
ROOT (ordinal=0), ask for children[0], and then depends if you want to do
DFS/BFS you call siblings[children[0]] or children[children[0]] .. what does it
matter if the child is the youngest/oldest?
> Simplify TaxoReader ParentArray/ChildrenArrays
> ----------------------------------------------
>
> Key: LUCENE-4565
> URL: https://issues.apache.org/jira/browse/LUCENE-4565
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Minor
> Attachments: LUCENE-4565.patch
>
>
> TaxoReader exposes two structures which provide information about a
> categories parent/childs/siblings: ParentArray and ChildrenArrays.
> ChildrenArrays are derived (i.e. created) from ParentArray.
> I propose to consolidate all that into one API ParentInfo, or
> CategoryTreeInfo (a better name?) which will provide the same information,
> only from one object. So instead of making these calls:
> {code}
> int[] parents = taxoReader.getParentArray();
> int[] youngestChilds = taxoReader.getChildrenArrays().getYoungestChildArray();
> int[] olderSiblings = taxoReader.getChildrenArrays().getOlderSiblingArray();
> {code}
> one would make these calls:
> {code}
> int[] parents = taxoReader.getParentInfo().parents();
> int[] youngestChilds = taxoReader.getParentInfo().youngestChilds();
> int[] olderSiblings = taxoReader.getParentInfo().olderSiblings();
> {code}
> Not a big change, just consolidate more code into one logical place. All of
> these arrays will continue to be lazily allocated.
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