/*
* Created on 25-Jan-2006
*/
package org.apache.lucene.queryparser.xml.builders;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.ParserException;
import org.apache.lucene.queryparser.xml.QueryBuilder;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/*
* 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.
*/
/**
* Builder for {@link BooleanQuery}
*/
public class BooleanQueryBuilder implements QueryBuilder {
private final QueryBuilder factory;
public BooleanQueryBuilder(QueryBuilder factory) {
this.factory = factory;
}
/* (non-Javadoc)
* @see org.apache.lucene.xmlparser.QueryObjectBuilder#process(org.w3c.dom.Element)
*/
public Query getQuery(Element e) throws ParserException {
BooleanQuery bq = new BooleanQuery(DOMUtils.getAttribute(e, "disableCoord", false));
bq.setMinimumNumberShouldMatch(DOMUtils.getAttribute(e, "minimumNumberShouldMatch", 0));
bq.setBoost(DOMUtils.getAttribute(e, "boost", 1.0f));
NodeList nl = e.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (node.getNodeName().equals("Clause")) {
Element clauseElem = (Element) node;
BooleanClause.Occur occurs = getOccursValue(clauseElem);
Element clauseQuery = DOMUtils.getFirstChildOrFail(clauseElem);
Query q = factory.getQuery(clauseQuery);
bq.add(new BooleanClause(q, occurs));
}
}
return bq;
}
static BooleanClause.Occur getOccursValue(Element clauseElem) throws ParserException {
String occs = clauseElem.getAttribute("occurs");
BooleanClause.Occur occurs = BooleanClause.Occur.SHOULD;
if ("must".equalsIgnoreCase(occs)) {
occurs = BooleanClause.Occur.MUST;
} else {
if ("mustNot".equalsIgnoreCase(occs)) {
occurs = BooleanClause.Occur.MUST_NOT;
} else {
if (("should".equalsIgnoreCase(occs)) || ("".equals(occs))) {
occurs = BooleanClause.Occur.SHOULD;
} else {
if (occs != null) {
throw new ParserException("Invalid value for \"occurs\" attribute of clause:" + occs);
}
}
}
}
return occurs;
}
}