QueryConfigHandler (Lucene 9.6.0 queryparser API)

java.lang.Object
- org.apache.lucene.queryparser.flexible.core.config.AbstractQueryConfig
- - org.apache.lucene.queryparser.flexible.core.config.QueryConfigHandler

Direct Known Subclasses:

StandardQueryConfigHandler
```
public abstract class QueryConfigHandler
extends AbstractQueryConfig
```
This class can be used to hold any query configuration and no field configuration. For field configuration, it creates an empty FieldConfig object and delegate it to field config listeners, these are responsible for setting up all the field configuration.
QueryConfigHandler should be extended by classes that intend to provide configuration to QueryNodeProcessor objects.
The class that extends QueryConfigHandler should also provide FieldConfig objects for each collection field.

See Also:

FieldConfig, FieldConfigListener, QueryConfigHandler

Constructor Summary

Constructors
Constructor Description

QueryConfigHandler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addFieldConfigListener(FieldConfigListener listener)`	Adds a listener.
`FieldConfig`	`getFieldConfig(String fieldName)`	Returns an implementation of `FieldConfig` for a specific field name.

Methods inherited from class org.apache.lucene.queryparser.flexible.core.config.AbstractQueryConfig
get, has, set, unset

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - QueryConfigHandler
```
public QueryConfigHandler()
```
- Method Detail
  - getFieldConfig
```
public FieldConfig getFieldConfig(String fieldName)
```
    Returns an implementation of FieldConfig for a specific field name. If the implemented QueryConfigHandler does not know a specific field name, it may return null , indicating there is no configuration for that field.
    
    Parameters:
    
    fieldName - the field name
    
    Returns:
    
    a FieldConfig object containing the field name configuration or null, if the implemented QueryConfigHandler has no configuration for that field
  - addFieldConfigListener
```
public void addFieldConfigListener(FieldConfigListener listener)
```
    Adds a listener. The added listeners are called in the order they are added.
    
    Parameters:
    
    listener - the listener to be added