[jira] Commented: (LUCENE-1937) Add more methods to manipulate QueryNodeProcessorPipeline elements

["Luis Alves (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763176#action_12763176 ] 

Luis Alves commented on LUCENE-1937:
------------------------------------

Hi Adriano,

Wouldn't it be better for the pipeline to implement the "List" interface.
What do you think?

> Add more methods to manipulate QueryNodeProcessorPipeline elements
> ------------------------------------------------------------------
>
>                 Key: LUCENE-1937
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1937
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>    Affects Versions: 2.9
>            Reporter: Adriano Crestani
>            Assignee: Adriano Crestani
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-1937.patch
>
>
> QueryNodeProcessorPipeline allows the user to define a list of processors to process a query tree. However, it's not very flexible when the user wants to extend/modify an already created pipeline, because it only provides an add method, which only allows the user to append a new processor to the pipeline.
> So, I propose to add new methods to manipulate the processor in a pipeline. I think the methods should not consider an index position when modifying the pipeline, hence the index position in a pipeline does not mean anything, a processor has a meaning when it's after or before another processor. Therefore, I suggest the methods should always consider another processor when inserting/modifying the pipeline. For example, insertAfter(processor, newProcessor), which will insert the "newProcessor" after the "processor".

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