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Date: Tue, 13 Oct 2009 14:59:31 -0700 (PDT)
From: "Adriano Crestani (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Assigned: (LUCENE-1937) Add more methods to manipulate
 QueryNodeProcessorPipeline elements
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     [ https://issues.apache.org/jira/browse/LUCENE-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adriano Crestani reassigned LUCENE-1937:
----------------------------------------

    Assignee:     (was: Adriano Crestani)

> 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
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-1937.patch, LUCENE-1937_10_13_2009.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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