| /* |
| * 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. |
| */ |
| package org.apache.lucene.queryparser.xml.builders; |
| |
| import org.apache.lucene.search.BooleanClause; |
| import org.apache.lucene.search.BooleanQuery; |
| import org.apache.lucene.search.BoostQuery; |
| 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; |
| |
| /** |
| * 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) |
| */ |
| |
| @Override |
| public Query getQuery(Element e) throws ParserException { |
| BooleanQuery.Builder bq = new BooleanQuery.Builder(); |
| bq.setMinimumNumberShouldMatch(DOMUtils.getAttribute(e, "minimumNumberShouldMatch", 0)); |
| |
| NodeList nl = e.getChildNodes(); |
| final int nlLen = nl.getLength(); |
| for (int i = 0; i < nlLen; 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)); |
| } |
| } |
| |
| Query q = bq.build(); |
| float boost = DOMUtils.getAttribute(e, "boost", 1.0f); |
| if (boost != 1f) { |
| q = new BoostQuery(q, boost); |
| } |
| return q; |
| } |
| |
| static BooleanClause.Occur getOccursValue(Element clauseElem) throws ParserException { |
| String occs = clauseElem.getAttribute("occurs"); |
| if (occs == null || "should".equalsIgnoreCase(occs)) { |
| return BooleanClause.Occur.SHOULD; |
| } else if ("must".equalsIgnoreCase(occs)) { |
| return BooleanClause.Occur.MUST; |
| } else if ("mustNot".equalsIgnoreCase(occs)) { |
| return BooleanClause.Occur.MUST_NOT; |
| } else if ("filter".equals(occs)) { |
| return BooleanClause.Occur.FILTER; |
| } |
| throw new ParserException("Invalid value for \"occurs\" attribute of clause:" + occs); |
| } |
| |
| } |