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From "Adriano Crestani (JIRA)" <>
Subject [jira] Created: (LUCENE-1937) Add more methods to manipulate QueryNodeProcessorPipeline elements
Date Thu, 01 Oct 2009 17:16:23 GMT
Add more methods to manipulate QueryNodeProcessorPipeline elements

                 Key: LUCENE-1937
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/*
    Affects Versions: 3.1
            Reporter: Adriano Crestani
            Assignee: Adriano Crestani
            Priority: Minor
             Fix For: 2.9

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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