# Package org.apache.lucene.queryparser.flexible.standard.processors

package org.apache.lucene.queryparser.flexible.standard.processors
Lucene Query Node Processors.

## Lucene Query Node Processors

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

These processors are already assembled correctly in the StandardQueryNodeProcessorPipeline.

Related Packages
Package
Description
org.apache.lucene.queryparser.flexible.standard
Lucene Flexible Query Parser Implementation
org.apache.lucene.queryparser.flexible.standard.builders
Standard Lucene Query Node Builders.
org.apache.lucene.queryparser.flexible.standard.config
Standard Lucene Query Configuration.
org.apache.lucene.queryparser.flexible.standard.nodes
Standard Lucene Query Nodes.
org.apache.lucene.queryparser.flexible.standard.parser
Lucene Query Parser
Classes
Class
Description
AllowLeadingWildcardProcessor
This processor verifies if `StandardQueryConfigHandler.ConfigurationKeys.ALLOW_LEADING_WILDCARD` is defined in the `QueryConfigHandler`.
AnalyzerQueryNodeProcessor
This processor verifies if `StandardQueryConfigHandler.ConfigurationKeys.ANALYZER` is defined in the `QueryConfigHandler`.
BooleanQuery2ModifierNodeProcessor
This processor is used to apply the correct `ModifierQueryNode` to `BooleanQueryNode`s children.
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 `StandardQueryConfigHandler.ConfigurationKeys.BOOST` in its config.
DefaultPhraseSlopQueryNodeProcessor
This processor verifies if `StandardQueryConfigHandler.ConfigurationKeys.PHRASE_SLOP` 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 `StandardQueryConfigHandler.ConfigurationKeys.FUZZY_CONFIG`, gets the fuzzy prefix length and default similarity from it and set to the fuzzy node.
IntervalQueryNodeProcessor
This processor makes sure that `StandardQueryConfigHandler.ConfigurationKeys.ANALYZER` is defined in the `QueryConfigHandler` and injects this analyzer into `IntervalQueryNode`s.
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_BLENDED_REWRITE`, for multi-term query nodes.
OpenRangeQueryNodeProcessor
Processes `TermRangeQuery`s with open ranges.
PhraseSlopQueryNodeProcessor
This processor removes invalid `SlopQueryNode` objects in the query node tree.
PointQueryNodeProcessor
This processor is used to convert `FieldQueryNode`s to `PointRangeQueryNode`s.
PointRangeQueryNodeProcessor
This processor is used to convert `TermRangeQueryNode`s to `PointRangeQueryNode`s.
RegexpQueryNodeProcessor
Processor for Regexp queries.
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.
TermRangeQueryNodeProcessor
This processors process `TermRangeQueryNode`s.
WildcardQueryNodeProcessor
The `StandardSyntaxParser` creates `PrefixWildcardQueryNode` nodes which have values containing the prefixed wildcard.