# Package org.apache.lucene.queryparser.flexible.core.config

package org.apache.lucene.queryparser.flexible.core.config
Base classes used to configure the query processing.

## Query Configuration Interfaces

The package `org.apache.lucene.queryparser.flexible.config` contains query configuration handler abstract class that all config handlers should extend.

See `StandardQueryConfigHandler` for a reference implementation.

The `QueryConfigHandler` and `FieldConfig` are used in the processors to access config information in a flexible and independent way. See `TermRangeQueryNodeProcessor` for a reference implementation.

- Related Packages
  Package
  Description
  org.apache.lucene.queryparser.flexible.core
  Core classes of the flexible query parser framework.
- Class
  Description
  AbstractQueryConfig
  This class is the base of `QueryConfigHandler` and `FieldConfig`.
  ConfigurationKey<T>
  An instance of this class represents a key that is used to retrieve a value from `AbstractQueryConfig`.
  FieldConfig
  This class represents a field configuration.
  FieldConfigListener
  This interface should be implemented by classes that wants to listen for field configuration requests.
  QueryConfigHandler
  This class can be used to hold any query configuration and no field configuration.