Add more methods to manipulate QueryNodeProcessorPipeline elements
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Key: LUCENE-1937
URL: https://issues.apache.org/jira/browse/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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