package org.apache.lucene.queryParser.standard.processors;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.List;
import org.apache.lucene.queryParser.core.QueryNodeException;
import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
import org.apache.lucene.queryParser.core.nodes.FieldQueryNode;
import org.apache.lucene.queryParser.core.nodes.FuzzyQueryNode;
import org.apache.lucene.queryParser.core.nodes.ParametricQueryNode;
import org.apache.lucene.queryParser.core.nodes.QueryNode;
import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
import org.apache.lucene.queryParser.core.util.UnescapedCharSequence;
import org.apache.lucene.queryParser.standard.config.LowercaseExpandedTermsAttribute;
import org.apache.lucene.queryParser.standard.nodes.WildcardQueryNode;
/**
* This processor verifies if the attribute
* {@link LowercaseExpandedTermsAttribute} is defined in the
* {@link QueryConfigHandler}. If it is and the expanded terms should be
* lower-cased, it looks for every {@link WildcardQueryNode},
* {@link FuzzyQueryNode} and {@link ParametricQueryNode} and lower-case its
* term. <br/>
*
* @see LowercaseExpandedTermsAttribute
*/
public class LowercaseExpandedTermsQueryNodeProcessor extends
QueryNodeProcessorImpl {
public LowercaseExpandedTermsQueryNodeProcessor() {
// empty constructor
}
@Override
public QueryNode process(QueryNode queryTree) throws QueryNodeException {
if (getQueryConfigHandler().hasAttribute(
LowercaseExpandedTermsAttribute.class)) {
if (getQueryConfigHandler().getAttribute(
LowercaseExpandedTermsAttribute.class).isLowercaseExpandedTerms()) {
return super.process(queryTree);
}
}
return queryTree;
}
@Override
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
if (node instanceof WildcardQueryNode || node instanceof FuzzyQueryNode
|| node instanceof ParametricQueryNode) {
FieldQueryNode fieldNode = (FieldQueryNode) node;
fieldNode.setText(UnescapedCharSequence.toLowerCase(fieldNode.getText()));
}
return node;
}
@Override
protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
return node;
}
@Override
protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
throws QueryNodeException {
return children;
}
}