## Package org.apache.lucene.queryParser.standard.processors

Lucene Query Node Processors

See:
Description

Class Summary
AllowLeadingWildcardProcessor: This processor verifies if the attribute `AllowLeadingWildcardAttribute` is defined in the `QueryConfigHandler`.
AnalyzerQueryNodeProcessor: This processor verifies if the attribute `AnalyzerQueryNodeProcessor` is defined in the `QueryConfigHandler`.
BooleanSingleChildOptimizationQueryNodeProcessor: This processor removes every `BooleanQueryNode` that contains only one child and returns this child.
BoostQueryNodeProcessor: This processor iterates the query node tree looking for every `FieldableNode` that has the attribute `BoostAttribute` in its config.
DefaultPhraseSlopQueryNodeProcessor: This processor verifies if the attribute `DefaultPhraseSlopAttribute` is defined in the `QueryConfigHandler`.
FuzzyQueryNodeProcessor: This processor iterates the query node tree looking for every `FuzzyQueryNode`, when this kind of node is found, it checks on the query configuration for `FuzzyAttribute`, gets the fuzzy prefix length and default similarity from it and set to the fuzzy node.
GroupQueryNodeProcessor: The `SyntaxParser` generates query node trees that consider the boolean operator precedence, but Lucene current syntax does not support boolean precedence, so this processor remove all the precedence and apply the equivalent modifier according to the boolean operation defined on an specific query node.
LowercaseExpandedTermsQueryNodeProcessor: This processor verifies if the attribute `LowercaseExpandedTermsAttribute` is defined in the `QueryConfigHandler`.
MatchAllDocsQueryNodeProcessor: This processor converts every `WildcardQueryNode` that is "*:*" to `MatchAllDocsQueryNode`.
MultiFieldQueryNodeProcessor: This processor is used to expand terms so the query looks for the same term in different fields.
MultiTermRewriteMethodProcessor: This processor instates the default `MultiTermQuery.RewriteMethod`, `MultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT`, for multi-term query nodes.
ParametricRangeQueryNodeProcessor: This processor converts `ParametricRangeQueryNode` objects to `RangeQueryNode` objects.
PhraseSlopQueryNodeProcessor: This processor removes invalid `SlopQueryNode` objects in the query node tree.
RemoveEmptyNonLeafQueryNodeProcessor: This processor removes every `QueryNode` that is not a leaf and has not children.
StandardQueryNodeProcessorPipeline: This pipeline has all the processors needed to process a query node tree, generated by `StandardSyntaxParser`, already assembled.
WildcardQueryNodeProcessor: The `StandardSyntaxParser` creates `PrefixWildcardQueryNode` nodes which have values containing the prefixed wildcard.

## Package org.apache.lucene.queryParser.standard.processors Description

## Lucene Query Node Processors

The package org.apache.lucene.queryParser.standard.processors contains every processor needed to assembly a pipeline that modifies the query node tree according to the actual Lucene queries.

This processors are already assembled correctly in the StandardQueryNodeProcessorPipeline.

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