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.nodes.QueryNode;
import org.apache.lucene.queryParser.core.nodes.SlopQueryNode;
import org.apache.lucene.queryParser.core.nodes.TokenizedPhraseQueryNode;
import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
import org.apache.lucene.queryParser.standard.nodes.MultiPhraseQueryNode;
/**
* This processor removes invalid {@link SlopQueryNode} objects in the query
* node tree. A {@link SlopQueryNode} is invalid if its child is neither a
* {@link TokenizedPhraseQueryNode} nor a {@link MultiPhraseQueryNode}. <br/>
*
* @see SlopQueryNode
*/
public class PhraseSlopQueryNodeProcessor extends QueryNodeProcessorImpl {
public PhraseSlopQueryNodeProcessor() {
// empty constructor
}
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
if (node instanceof SlopQueryNode) {
SlopQueryNode phraseSlopNode = (SlopQueryNode) node;
if (!(phraseSlopNode.getChild() instanceof TokenizedPhraseQueryNode)
&& !(phraseSlopNode.getChild() instanceof MultiPhraseQueryNode)) {
return phraseSlopNode.getChild();
}
}
return node;
}
protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
return node;
}
protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
throws QueryNodeException {
return children;
}
}