package org.apache.lucene.queryparser.flexible.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.search.TermRangeQuery; // javadocs
import org.apache.lucene.queryparser.flexible.core.QueryNodeException;
import org.apache.lucene.queryparser.flexible.core.nodes.FieldQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl;
import org.apache.lucene.queryparser.flexible.core.util.UnescapedCharSequence;
import org.apache.lucene.queryparser.flexible.standard.nodes.TermRangeQueryNode;
/**
* Processes {@link TermRangeQuery}s with open ranges.
*/
public class OpenRangeQueryNodeProcessor extends QueryNodeProcessorImpl {
final public static String OPEN_RANGE_TOKEN = "*";
public OpenRangeQueryNodeProcessor() {}
@Override
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
if (node instanceof TermRangeQueryNode) {
TermRangeQueryNode rangeNode = (TermRangeQueryNode) node;
FieldQueryNode lowerNode = rangeNode.getLowerBound();
FieldQueryNode upperNode = rangeNode.getUpperBound();
CharSequence lowerText = lowerNode.getText();
CharSequence upperText = upperNode.getText();
if (OPEN_RANGE_TOKEN.equals(upperNode.getTextAsString())
&& (!(upperText instanceof UnescapedCharSequence) || !((UnescapedCharSequence) upperText)
.wasEscaped(0))) {
upperText = "";
}
if (OPEN_RANGE_TOKEN.equals(lowerNode.getTextAsString())
&& (!(lowerText instanceof UnescapedCharSequence) || !((UnescapedCharSequence) lowerText)
.wasEscaped(0))) {
lowerText = "";
}
lowerNode.setText(lowerText);
upperNode.setText(upperText);
}
return node;
}
@Override
protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
return node;
}
@Override
protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
throws QueryNodeException {
return children;
}
}