core/org.eclipse.smila.solr/lib/source/org/apache/lucene/queryparser/xml/builders/BooleanFilterBuilder.java

/*
 * Created on 25-Jan-2006
 */
package org.apache.lucene.queryparser.xml.builders;

import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.queries.BooleanFilter;
import org.apache.lucene.search.Filter;
import org.apache.lucene.queries.FilterClause;
import org.apache.lucene.queryparser.xml.DOMUtils;
import org.apache.lucene.queryparser.xml.FilterBuilder;
import org.apache.lucene.queryparser.xml.ParserException;
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 BooleanFilter}
 */
public class BooleanFilterBuilder implements FilterBuilder {

  private final FilterBuilder factory;

  public BooleanFilterBuilder(FilterBuilder factory) {
    this.factory = factory;
  }

  @Override
  public Filter getFilter(Element e) throws ParserException {
    BooleanFilter bf = new BooleanFilter();
    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 = BooleanQueryBuilder.getOccursValue(clauseElem);

        Element clauseFilter = DOMUtils.getFirstChildOrFail(clauseElem);
        Filter f = factory.getFilter(clauseFilter);
        bf.add(new FilterClause(f, occurs));
      }
    }

    return bf;
  }

}