org.apache.lucene.queryParser.standard.processors
Class AnalyzerQueryNodeProcessor

java.lang.Object
  org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl
      org.apache.lucene.queryParser.standard.processors.AnalyzerQueryNodeProcessor

All Implemented Interfaces:

QueryNodeProcessor

public class AnalyzerQueryNodeProcessor
extends QueryNodeProcessorImpl

This processor verifies if StandardQueryConfigHandler.ConfigurationKeys.ANALYZER is defined in the QueryConfigHandler. If it is and the analyzer is not null, it looks for every FieldQueryNode that is not WildcardQueryNode, FuzzyQueryNode or ParametricQueryNode contained in the query node tree, then it applies the analyzer to that FieldQueryNode object.

If the analyzer return only one term, the returned term is set to the FieldQueryNode and it's returned.

If the analyzer return more than one term, a TokenizedPhraseQueryNode or MultiPhraseQueryNode is created, whether there is one or more terms at the same position, and it's returned.

If no term is returned by the analyzer a NoTokenFoundQueryNode object is returned.

See Also:

StandardQueryConfigHandler.ConfigurationKeys.ANALYZER, Analyzer, TokenStream

Constructor Summary

AnalyzerQueryNodeProcessor()

Method Summary

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.
QueryNode	process(QueryNode queryTree) Processes a query node tree.
protected List<QueryNode>	setChildrenOrder(List<QueryNode> children) This method is invoked for every node that has at least on child.

Methods inherited from class org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl

getQueryConfigHandler, processChildren, setQueryConfigHandler

Methods inherited from class java.lang.Object

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

Constructor Detail

AnalyzerQueryNodeProcessor

public AnalyzerQueryNodeProcessor()

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

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

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 List<QueryNode> setChildrenOrder(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