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

Class WildcardQueryNodeProcessor

java.lang.Object

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

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

All Implemented Interfaces:

QueryNodeProcessor

public class WildcardQueryNodeProcessor
extends QueryNodeProcessorImpl

The StandardSyntaxParser creates PrefixWildcardQueryNode nodes which have values containing the prefixed wildcard. However, Lucene PrefixQuery cannot contain the prefixed wildcard. So, this processor basically removed the prefixed wildcard from the PrefixWildcardQueryNode value.

See Also:

PrefixQuery, PrefixWildcardQueryNode

Field Summary

Fields

Modifier and Type	Field	Description
private static java.util.regex.Pattern	WILDCARD_PATTERN

Constructor Summary

Constructors

Constructor	Description
WildcardQueryNodeProcessor()

Method Summary

Modifier and Type	Method	Description
private static java.lang.String	analyzeWildcard(Analyzer a, java.lang.String field, java.lang.String wildcard)
private boolean	isPrefixWildcard(java.lang.CharSequence text)
private boolean	isWildcard(java.lang.CharSequence text)
protected QueryNode	postProcessNode(QueryNode node)	This method is invoked for every node when walking up the tree.
protected QueryNode	preProcessNode(QueryNode node)	This method is invoked for every node when walking down the tree.
protected java.util.List<QueryNode>	setChildrenOrder(java.util.List<QueryNode> children)	This method is invoked for every node that has at least on child.

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

getQueryConfigHandler, process, processChildren, setQueryConfigHandler

Methods inherited from class java.lang.Object

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

Field Detail

WILDCARD_PATTERN

private static final java.util.regex.Pattern WILDCARD_PATTERN

Constructor Detail

WildcardQueryNodeProcessor

public WildcardQueryNodeProcessor()

Method Detail

analyzeWildcard

private static java.lang.String analyzeWildcard(Analyzer a,
                                                java.lang.String field,
                                                java.lang.String wildcard)

postProcessNode

protected QueryNode postProcessNode(QueryNode node)
                             throws QueryNodeException

Description copied from class: QueryNodeProcessorImpl

This method is invoked for every node when walking up the tree.

Specified by:

postProcessNode in class QueryNodeProcessorImpl

Parameters:

node - node the query node to be post-processed

Returns:

a query node

Throws:

QueryNodeException - if something goes wrong during the query node processing

isWildcard

private boolean isWildcard(java.lang.CharSequence text)

isPrefixWildcard

private boolean isPrefixWildcard(java.lang.CharSequence text)

preProcessNode

protected QueryNode preProcessNode(QueryNode node)
                            throws QueryNodeException

Description copied from class: QueryNodeProcessorImpl

This method is invoked for every node when walking down the tree.

Specified by:

preProcessNode in class QueryNodeProcessorImpl

Parameters:

node - the query node to be pre-processed

Returns:

a query node

Throws:

QueryNodeException - if something goes wrong during the query node processing

setChildrenOrder

protected java.util.List<QueryNode> setChildrenOrder(java.util.List<QueryNode> children)
                                              throws QueryNodeException

Description copied from class: QueryNodeProcessorImpl

This method is invoked for every node that has at least on child. It's invoked right before QueryNodeProcessorImpl.postProcessNode(QueryNode) is invoked.

Specified by:

setChildrenOrder in class QueryNodeProcessorImpl

Parameters:

children - the list containing all current node's children

Returns:

a new list containing all children that should be set to the current node

Throws:

QueryNodeException - if something goes wrong during the query node processing