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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