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

Class BooleanQuery2ModifierNodeProcessor

java.lang.Object

org.apache.lucene.queryparser.flexible.standard.processors.BooleanQuery2ModifierNodeProcessor

All Implemented Interfaces:

QueryNodeProcessor

public class BooleanQuery2ModifierNodeProcessor
extends Object
implements QueryNodeProcessor

This processor is used to apply the correct ModifierQueryNode to BooleanQueryNodes children. This is a variant of BooleanModifiersQueryNodeProcessor which ignores precedence.

The StandardSyntaxParser knows the rules of precedence, but lucene does not. e.g. (A AND B OR C AND D) ist treated like (+A +B +C +D).

This processor walks through the query node tree looking for BooleanQueryNodes. If an AndQueryNode is found, every child, which is not a ModifierQueryNode or the ModifierQueryNode is ModifierQueryNode.Modifier.MOD_NONE, becomes a ModifierQueryNode.Modifier.MOD_REQ. For default BooleanQueryNode, it checks the default operator is StandardQueryConfigHandler.Operator.AND, if it is, the same operation when an AndQueryNode is found is applied to it. Each BooleanQueryNode which direct parent is also a BooleanQueryNode is removed (to ignore the rules of precedence).

See Also:

• StandardQueryConfigHandler.ConfigurationKeys.DEFAULT_OPERATOR
• BooleanModifiersQueryNodeProcessor

Constructor Summary

Constructors

Constructor	Description
BooleanQuery2ModifierNodeProcessor()

Method Summary

Modifier and Type	Method	Description
QueryConfigHandler	getQueryConfigHandler()	Returns the QueryConfigHandler associated to the query tree if any, otherwise it returns null
QueryNode	process(QueryNode queryTree)	Processes a query node tree.
void	setQueryConfigHandler(QueryConfigHandler queryConfigHandler)	Sets the QueryConfigHandler associated to the query tree.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BooleanQuery2ModifierNodeProcessor

public BooleanQuery2ModifierNodeProcessor()

Method Details

process

public QueryNode process(QueryNode queryTree)
                  throws QueryNodeException

Description copied from interface: QueryNodeProcessor

Processes a query node tree. It may return the same or another query tree. I should never return null.

Specified by:

process in interface QueryNodeProcessor

Parameters:

queryTree - tree root node

Returns:

the processed query tree

Throws:

QueryNodeException

setQueryConfigHandler

public void setQueryConfigHandler(QueryConfigHandler queryConfigHandler)

Description copied from interface: QueryNodeProcessor

Sets the QueryConfigHandler associated to the query tree.

Specified by:

setQueryConfigHandler in interface QueryNodeProcessor

getQueryConfigHandler

public QueryConfigHandler getQueryConfigHandler()

Description copied from interface: QueryNodeProcessor

Returns the QueryConfigHandler associated to the query tree if any, otherwise it returns null

Specified by:

getQueryConfigHandler in interface QueryNodeProcessor

Returns:

the QueryConfigHandler associated to the query tree if any, otherwise it returns null