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