org.apache.lucene.queryparser.flexible.precedence.processors

Class BooleanModifiersQueryNodeProcessor

java.lang.Object

org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl

org.apache.lucene.queryparser.flexible.precedence.processors.BooleanModifiersQueryNodeProcessor

All Implemented Interfaces:

QueryNodeProcessor

public class BooleanModifiersQueryNodeProcessor
extends QueryNodeProcessorImpl

This processor is used to apply the correct ModifierQueryNode to BooleanQueryNodes children.

It 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 any other BooleanQueryNode which is not an OrQueryNode, it checks the default operator is StandardQueryConfigHandler.Operator.AND, if it is, the same operation when an AndQueryNode is found is applied to it.

See Also:

StandardQueryConfigHandler.ConfigurationKeys.DEFAULT_OPERATOR, StandardQueryParser.setDefaultOperator(org.apache.lucene.queryparser.flexible.standard.config.StandardQueryConfigHandler.Operator)

Constructor Summary

Constructors

Constructor and Description
BooleanModifiersQueryNodeProcessor()

Method Summary

Modifier and Type	Method and Description
QueryNode	process(QueryNode queryTree) Processes a query node tree.

Methods inherited from class org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl

getQueryConfigHandler, setQueryConfigHandler

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanModifiersQueryNodeProcessor

public BooleanModifiersQueryNodeProcessor()

Method Detail

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

Overrides:

process in class QueryNodeProcessorImpl

Parameters:

queryTree - tree root node

Returns:

the processed query tree

Throws:

QueryNodeException